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Hear Me Out! || s. ishigami

I got carried away again... this was supposed to be a stupid dumb drabble based on @yummyrevivalfluid 's YouTuber Senku post. but then I couldn't stop, and then I wanted to get some of my other senku ideas out of the way, and then it just spiraled into this long, semi-serious fic.... so yeah, enjoy!

cws: slow burn, strangers to partners to lovers, friends to lovers, mutual pining, nerds in love, social media stuff, reader is a flirt, eventual relationship, senku is lowk OOC, he's also down bad (#needthat), kinda cringe ngl...

nsfw cws: first times, emotional sex, switch dynamics, fingering, handjob, wrap it before you tap it (they do not...), hair pulling (giving), very implied voice kink,pillow talk, lmk if I missed anything major!

12.5k words

When you first stumbled across Mecha Senku, it was because your college chemistry professor couldn’t explain ionic bonding properly even if their life depended on it. And honestly? That would’ve been fine. You weren’t failing or falling behind on anything. You were the kind of person who took the time to color-code your notes. With pretty pastel highlighters and calligraphy titles like your professor wasn't speaking at 60mph.

You visibly got annoyed when someone asked a question that had already been answered. Five minutes ago. Word for word. And you weren’t subtle about it either. The eye twitches. The sigh. In fact, you studied chapters ahead for fun! Call it being a try-hard, but it was just how you functioned. So when something didn’t click? When you didn’t understand something?

You spiraled. Productively, of course.

So here you are. 1:34AM. Snuggled up in your bed, lights off, blackout curtains drawn, and laptop open at full brightness as you scrolled YouTube, bleary-eyed and annoyed. The only light in the room is the faint blue glow of YouTube’s homepage and your will to academically succeed (read: suffer).

You typed “bond angles” into the search bar. Hit enter, and scrolled. Then a thumbnail caught your eye.

“Predicting Bond Angles – (VSEPR Theory but not boring)” Channel: Mecha Senku Runtime: 5:28

And then you heard it.

That voice. you practically drooled at your screen. It was soft and deep, yet raspy, like he talked too much—which he did—or didn’t care if he wore out his throat explaining the same concept fifteen times. And when he rambled? Oh god. When he got caught up on a tangent about orbital hybridization—when his voice cracked just slightly because his brain was going faster than his mouth?

Yeah, you were soaked.

Kidding.

...Maybe.

You pulled your blanket tighter around your shoulders like that would protect you. Like you weren’t voluntarily listening to this man monologue about VSEPR models like it was foreplay.

You tried to focus on the science. Really, you did. He even had good diagrams—clean visuals, clear examples, actual accuracy. It was kind of annoying how helpful it was, actually. Like, did he have to sound hot while also being smart?

You watched the entire thing.

Then another.

Before you knew it, you were five videos deep. At 2:11AM.

Your poor, old, worn-down laptop was probably overheating from the sheer amount of your spiraling. You didn’t even care.

And then… there was that video.

A short one. Barely three minutes.

“Iodine Clock Reaction – Visual Chemistry in Real Time”

You clicked on it like you were possessed.

It was simple—two clear liquids, a few drops of starch, and a timer. You knew the experiment already. You’d seen it done a dozen times in lab. You’d even done it yourself. But somehow, when he did it, it was a cinematic masterpiece.

The camera was angled just right—focused tight on his gloved hands, the faint clink of glass, the gentle pour of the liquid. His voice low, casual, like he was walking you through a magic trick instead of an actual chemical reaction.

And then—the clamps.

He adjusted the glassware with the same energy you imagined he’d use to unbutton his lab coat (which you have no idea why your thoughts immediately ran there)—methodical, focused, and totally unaware of the damage he was doing to your sanity. Forearms flexing, veins shifting, wrist angled just slightly—You blinked. Rewound ten seconds. Then watched it again.

Something dark and sinister bloomed in your chest. Something carnal. Unholy. You buried half your face in your pillow and made a sound that can only be described as a blowdryer on max output immediately followed by a deep, guttural moan. Like your soul was trying to evacuate your body in protest—but got stuck halfway out, sobbing.

You didn’t even know you had a thing for forearms.

Yet here you are. You were a mess. A high-functioning, academically driven, chemically confused mess, replaying a three-minute video about reaction rates like it was an award winning movie. Like it wasn’t educational.

“This is fine. I’m still learning.” You whispered to yourself

You weren’t.

At least, not about chemistry.

Extra notes about mecha senku!

Certified yapper; it gets so bad he just add timestamps to when he gets back on topic

Always says that stupid little catchphrase— “this is exhilarating, get excited” he can’t help himself, its like second nature

While editing his experiment videos, he add little text boxes that say “*item* acquired” ( like in the anime)

That comes in handy later

⋆.⌬ ˚𒉭 ⋆

At first, it was a side project. Something to kill time between lectures, experiments, and tutoring sessions with students who couldn’t tell a mole from a molecule if their GPA depended on it. He kept the uploads short. Clean. No face, no fluff. Just experiments and explanations—combustion, osmosis, acid-base reactions. The basic building blocks of chemistry and physics, broken down in that signature tone of his: concise, confident, and just slightly condescending.

Naturally, people loved it.

Especially college students. Especially the ones who’d seen too many dead-eyed professors stumble through half-baked PowerPoints that they repurposed over the past 5 decades and somehow still made them boring.

He didn’t need gimmicks. Just science.

And, apparently, his voice.

The comments were... something. He ignored them, mostly. Or at least, tried to.

But even he had limits.

@lo1itado11: FLASH US!!! @freakwy: ong WE all cracking Username: i will combust and it won’t be a controlled reaction. Anotherusername: i can literally get off to his voice rn bro omg…

He sighed, deeply. Then dragged a hand through his loosely tied-up hair, fingers threading through strands that refused to stay neat. He didn’t even bother hiding the twitch in his left eye.

Degenerates. All of them.

Still, every new upload got thousands of views in under an hour. Every deep dive request was more unhinged than the last. And while he could ignore the thirst comments, he couldn’t deny the numbers.

His channel was growing. Fast. And if someone asked him to demonstrate a specific experiment?

Well.

He was a scientist.

And who was he to deny a request in the name of scientific curiosity?

⋆.⌬ ˚𒉭 ⋆

Now, Senku wasn’t exactly an avid social media user.

Sure, he had all the apps downloaded—after relentless badgering from Gen and Ryusui, who had both made it their mission to pressure him into being “normal” for once. Senku used Instagram occasionally, mostly to lurk. To like Taiju’s blurry gym selfies. To comment “inaccurate” under Chrome’s chaotic science photo dumps—half of which somehow included a blurry photo of him.

Nothing on his own feed, though. His personal account was private, untouched, maxed out at like 26 followers—half of which were probably bots, and one was definitely just Ryusui’s alt.

However, he was used to getting notifications on his side account. His real one. The one that mattered.

@/mecha.senku.

So when he got a ping from TikTok, he didn’t think much of it. Just a red-and-white flash in the corner of his screen as he walked past a group of undergrads in the quad, huddled around a phone, laughing. Loudly.

Then it happened again. Another ping. Then another.

People tagging him in the same comment section. Spamming him.

Weird.

It wasn’t until after his lecture, holed up in the farthest corner of the campus library, headphones in, laptop open, coffee cooling rapidly at his elbow, half-forgotten.

The notification trail led to a single video.

At first glance, it was just a cake.

A badly decorated one at that—a war crime in the form of buttercream—uneven icing, no symmetry, and piped text that looked like it was written mid-seizure. He could’ve done better blindfolded. He was about to swipe away.

Until he saw the video thumbnail again.

He squinted. Froze. Looked closer.

It was you.

Holding a handful of what looked like paper-taped sticks. Your fingers curled delicately around them, like you’d spent time choosing each one. The video hadn’t even started yet and it was already climbing in views, the likes ticking like a metronome. The top comment had nearly eighty thousand likes.

@/semioli: “I KNEW YOU’D PUT HIM FIRST OMFG”

Senku blinked. Then, almost reluctantly, pressed play.

“Okay, so this is my ‘Hear Me Out’ cake,” you said with a breathless little laugh, voice rich with amusement and just the right touch of self-deprecation. “Please don’t judge…”

You laughed nervously at the camera, your voice familiar in the way ambient noise becomes addictive. He knew you—kind of. You were popular, at least on campus. Friendly with everyone. Smart. You asked questions in class that weren’t dumb, which was rare. People actually listened when you talked.

But he never—not once—imagined you listened to him.

Until the moment your fingers—painted nails and all—planted the first stick dead center into the cake. His channel logo. Bright. Unmistakable. Front and center.

Senku sat still. Very still. His breath caught somewhere in the back of his throat.

“I don’t know what it is about him,” you went on, eyes wide and glittering like you couldn’t believe what you were admitting, “but I feel a carnal type of desire whenever I hear his voice.”

Silence.

Real, gut-wrenching silence.

Senku just stared at the screen. One brow lifted. Lips parted slightly. Blinking. Nothing.

“…What.”

It wasn’t like he hadn’t heard shit like that before. He had. The comments under his videos were riddled with deranged confessionals and late-night voice-induced breakdowns. He’d seen them. Sighed at them. Maybe rolled his eyes on occasion.

But something about hearing you say that—out loud—while staring directly into the camera, shoving his logo into a cake like it was the most natural thing in the world…Now he’s reading the rest of the comments, most of which you had liked.

“his voice scratches my brain in just the right spot i can’t explain it.” “if he ever does a face reveal it’s over for all of us.” “whoever he is irl i hope he’s single bc i’m mentally married to him already.” “i can’t even watch his videos in public anymore istg.”

A laugh, airy and sharp, passed out through his nose.

It was barely even a sound, just air. His head tilted back slowly against the chair, bones creaking lazily. One hand reached up, dragging through his hair—half-loose from the shitty tie job he’d done earlier. He didn’t even realize he was smirking. Eyes narrowed. Lashes lowered. Something wicked curled across his face, subtle but steeped in ego.

So.

You were into him.

And you didn’t even know that he sat two rows behind you in lecture. That the guy scribbling thermodynamic equations while you twirled your pen and tapped your knee was the same voice that apparently haunted your dreams.

Interesting.

Very, very interesting.

Senku closed the tab. Then reopened it not even ten seconds later, still somehow thinking his sleep deprivation was finally catching up to him. Big mistake.

You were still there—smiling at the camera, laughing like you hadn’t just shoved a stick into a cake bearing his logo and said you felt a “carnal desire” whenever you heard his voice.

He stared at the screen like it personally offended him. It didn’t. Not really. The offense was fake—just a weak cover for something worse, something much more humiliating.

You were attractive. That much had always been obvious.

He had eyes, didn’t he?

He wasn’t blind. He noticed things. Like the way you always had some elaborate doodle in the margins of your notebook that changed depending on your current hyperfixation. Like how you spoke with your hands, too fast sometimes, expressive. Like how your voice always had a bit of a lilt when you were excited about something, like you were trying not to talk over yourself. Like how you liked sitting near the window in lecture, even if it made it harder to see the board.

He noticed everything.

Which was the problem.

Because now he couldn’t stop noticing.

Your face. Your voice. Your laugh.

And the worst part?

You were smart.

Not smart like “gets good grades.” That wasn’t hard. No—smart like engaged. Curious. Your own brand of chaotic genius that showed up in how you argued with professors and picked at theories like they were complex puzzles meant for your hands alone.

You were confident. Passionate. Sharp.

You were…

Fuck.

He sat back in his chair and rubbed his face with both hands, groaning.

He didn’t do this. He didn’t get… distracted. He didn’t get flustered. Romance wasn’t even on the table. It was too messy. Too emotional. Too inefficient. He had research. He had goals. The last thing he needed was—

Another notification.

He glanced over. More tags. More people replying to your video.

More people joking, “@mecha.senku bro SAY SOMETHING!!! WE KNOW YOU SEE THIS.”

He hovered. His cursor blinking over the comment section.

He shouldn’t. There was no reason to. There was no benefit. No scientific purpose. No—He cracked his knuckles once. Took a slow breath. And typed.

@mecha.senku: Just a hear me out huh?

He pressed enter, then shut the laptop.

And immediately regretted everything.

Because within 30 seconds, the comment had over 2 thousand likes. The reply threads birthing entire romance novels in real time.

“OH MY GOD HE COMMENTED OH MY GOD OH MY—” “HE KNOWS. HE FUCKING KNOWS. “NAH??? THE MAN HIMSELF??? NO WAY” “@y/n GIRL U NEED TO WAKE UP RN”

Every five seconds, your phone buzzes.

Buzz.

BuzzBuzzBuzz.

It starts slow—innocent. A like here. A tag there. Then, as if the universe pulled a lever, it turns into an avalanche. Your screen lights up like it’s trying to melt in your hand. TikTok. Twitter. Instagram. Even people from your group project in history are texting you like girl what the actual fuck did you DO?

You’re sitting cross-legged on your bed, charger barely keeping up, blanket wrapped around your shoulders like it can protect you from the moment. Your face is hot. Your jaw is slack. Your soul? Practically nonexistent.

You stare at the screen in disbelief.

Right there, in the comments, bolded like the laws of physics decided to write you a personalized romance book:

@/mecha.senku: just a hear me out huh

You blinked once. Then twice. Rubbed your eyes. Because—no. No way.

There’s absolutely no way that the literal voice of your academic downfall and emotional spiral just casually acknowledged the fact that you want to climb him like a fucking molecular structure.

Your mouth opens. Nothing comes out. You double-tap your phone by accident. Scroll. Scroll again. Scroll back. It's still there. You suck in a breath like it's going to help. It doesn't.

Your room spins a little—not in a dizzy way, more like the fabric of reality is reconfiguring around your phone screen. Like you’ve accidentally made a deal with a god and now the god is texting you back. Casually. In lowercase.

Your body chooses to react the only way it knows how—by laughing. Not normal laughing. That kind of panicked, unhinged, screeching laugh that sounds like it’s being wrung out of you like a wet rag. A noise clawing its way up your throat as you slowly tip sideways, dramatic as hell, into the mattress.

“Wow,” you say out loud to your empty room, chest rising and falling, heart jackhammering somewhere behind your ribs. “No way. This is such a crazy-ass dream…” Your voice cracks at the end. You sound borderline delirious.

But the comment is still there. Pinned by the original creator. Which is you.

You just close your eyes. Face-down into your pillow.

Your dignity? Gone.

Your supposed crush? Apparently omniscient.

Your life? Ruined. Maybe. Probably.

But your phone’s still vibrating under your thigh like it’s trying to combust.

And yeah. You’re never going to be normal about this again.

⋆.⌬ ˚𒉭 ⋆

It’s a few days later when you finally have biochem again.

Your professor had sent out an email at the end of last class—something about paying attention to the partner list for the next lab. You hadn’t even looked. Too busy hyperventilating over the Mecha Senku situation. Too busy swiping through your phone at 1 a.m., rereading that comment like it might suddenly disappear, or—worse—turn into something more incriminating.

You didn’t sleep much. Or at all. You just kinda laid there, vibrating at a frequency only dogs could decipher, while mentally reviewing every second of that video and every stupid thing you’d ever said about his voice.

So when your professor calls out your name and tells you to head to the back bench to meet your assigned partner, you’re still in a daze. You adjust your lab coat, swipe lip balm on with hands that are definitely not still shaking, and make your way to the station with the dull dread of someone walking to their own execution.

And then you see him.

Senku Ishigami.

Hair pulled into that slightly messy half-up style he always wears. Safety goggles already on, sleeves rolled up, already gloved. He doesn’t look up at first—he’s swabbing the inside of a petri dish with a level of focus you reserve only for exams and existential dissociations. Then he glances at you, just a quick flick of the eyes.

“Hey,” he says, voice low, casual. A little rough around the edges, like he just got over a cold or hadn’t talked to anyone in hours.

Your spine locks. You blink. Hard.

“Hi,” you manage, but it comes out thinner than you mean it to—stretched at the edges, fraying like an old thread. “You’re… my partner?”

He glances at the roster sheet clipped to the bench as if just now confirming something he already knew. “Looks like it.” There’s the faintest twitch at the corner of his mouth—barely a smirk, more like a thought trying to become one. “Hope you’re decent with a microscope.”

You nod. Too fast. Too eager. Like your neck forgot how to move naturally. You try to smile like this is fine. Like this is normal. Like this isn’t currently short-circuiting every neuron in your academic-functioning brain.

You’ve never really spoken to Senku Ishigami before. Not really. Maybe a passing nod in the hallway. A blink-and-you-miss-it smile between lecture shifts. A polite “excuse me” when your bags bumped in the lab supply room once. But that was it. That was the whole sum of your direct interactions.

Everything else was observation. Safe distance admiration. Seeing him carry entire study groups with nothing but a half-dry marker and that ever-focused look in his eye. Taking note of how he argued with professors—calm, surgical, relentless—and somehow still walked out of every debate not only correct, but respected.

You admired him from afar. Kinda academically. Kinda not. (mostly not.)

But you’re a girl dedicated to her degree. A girl with goals, with caffeine basically in your bloodstream and deadlines stitched into the fabric of your week. You don’t get distracted. Not by things like this. Not by people like him. Or at least you didn’t. Until now.

Because working with him shouldn’t be this bad. Shouldn’t feel like the center of gravity shifted slightly under your feet, like the air got thinner and thicker all at once.

Except he rolls his sleeves up higher. Forearms peaking out. The lean muscle dusted in faint freckles, veins running like undercurrents

And then—God. The way he adjusts the microscope. Methodical. Controlled. His fingers moving like he’s done this a thousand times and still treats the equipment like it’s breakable—which it is, so you have no idea why him treating it as such is doing something to you—it all starts to blur together in your head.

You blink again. Swallow hard. And then you start to think back.

His voice.

That same voice. The cadence is exact. Steady and sharp with a rasp that scrapes along your spine in the worst/best way. A quiet breathless ramble as he explains the agar base—like the information is too much to simply stay in his head, like he forgets other people are listening. That subtle catch on certain consonants. That dry, low huff of amusement when your glove doesn’t go on right and you curse under your breath.

And then his hands.

Long fingers. Familiar motions. The way he handles the petri dish with practiced ease, adjusts the swabs like he’s composing something. You know those hands. You’ve seen them before. Over and over. In reaction videos. In slow motion clips, 0.25x speed. In the YouTube comments people timestamp for “scientific purposes.”

You freeze.

Fully. Completely paralyzed in real time like someone hit pause on your central nervous system. The classroom noise goes muffled. Muted. The hum of fluorescent lights above you turns sharp and migraine inducing bright. Your pulse is in your mouth now—behind your eyes, in your fingertips.

Because you’re looking at him. Really looking.

And it hits you like a truck doing 90 in a 60.

That’s him.

Your biochem lab partner. Senku Ishigami.

Is Mecha Senku. The, Mecha Senku.

And he knows. Oh, he knows.

He’s not even looking at you right now, but you swear—swear—there’s the faintest curve at the edge of his mouth. A smirk barely there, as he slides a sample onto the tray like he didn’t just casually detonate your grasp on reality.

“Oh my god,” you breathe. Not loud. But not quiet, either.

He doesn’t say anything. Doesn’t react. Doesn’t so much as flinch. But you feel it. The moment it registers. The moment he knows that you know. Because the corner of his mouth twitches higher. Just a little. Just enough to catch onto. And then—still not looking at you, still pretending to be invested in his perfectly aligned swab placement, voice smooth and clinical like this is just another lab session—he says,

“Something wrong?”

You want to bang your head on the table.

Instead, you choke, swallow whatever dignity you had left, and squeak out,

“No. Nope. All good. Just… thinking.”

He hums, low and amused, like he already knows what you’re thinking about.

You're going to die here. Right next to your science tutor YouTuber crush who is also your real-life lab partner crush—for completely unrelated reasons—who has definitely, 1000% seen the video where you said hearing his voice makes you feel like your guts are being spiritually rearranged.

God.

You are so unbelievably, irreparably screwed.

⋆.⌬ ˚𒉭 ⋆

It doesn’t happen right away.

In fact, it almost doesn’t happen at all.

Because after the Mecha Senku revelation, after the comment, after the lab, after the video—you basically short-circuit. You try to act normal in the days that follow. You show up to class. Try to pretend like it’s no big deal that your anonymous science tutor crush is also your lab partner who is also your mutual…acquaintence? Friend? You didn't know which term you fell under in this situation. You tell yourself it’s fine. It’s not weird. You’re being mature about this.

And then he likes one of your posts. One of your older ones. A video from 3 months ago where you’re ranting about a series that you were into at the time while getting ready for the day. It was a stupid, pointless video. One which he had no reason to like. But he did.

That’s when you panic.

Not in public. But you lie in bed again at 2AM, staring at your screen like it might suddenly catch on fire. He’s watching your content. On purpose. He’s scrolling. Deep enough to find something from weeks ago, which means he’s either curious, bored, or—God forbid—interested.

You stop posting for three days.

Not out of pride. Not even out of posting strategy. Just fear. Raw, buzzing fear that anything you say or do will somehow make this whole situation worse. You delete a draft. Then another. Then six more. Your camera roll becomes a graveyard of half-filmed attempts at being funny or cute or sweet or not on the verge of a breakdown. But nothing feels right.

And meanwhile, Senku is being maddeningly normal.

He shows up to lab on time. Speaks when necessary. Makes the occasional snide remark when a burner malfunctions or a pH test fails. He doesn’t bring up the video. Doesn’t mention the TikTok. Doesn’t acknowledge the fact that you both know that this is like some weird fucked up romcom scenario that immediately got put on Tubi for its low budget. He just acts like… himself. Detached, sharp-tongued, observant, and unbothered. You, on the other hand, are barely holding it together every time he passes you a report sheet.

The dam doesn’t break until two weeks later.

You’re walking out of lecture, halfway through stuffing your notes into your bag with a granola bar half-eaten in your mouth when you hear someone fall into step beside you. Quietly synced with your rhythm, like they’d been waiting for the right second to align.

You glance over.

Senku.

Of course it’s Senku. His sweater sleeves rolled up to his elbows. Satchel strap slung lazy across his chest, and a half drunk energy drink swished in his hand. His expression is unreadable, somewhere between tired and calculating, but the fact that he’s here, walking beside you unprompted, is enough to make you question every single one of your life choices.

You’re not sure if you should say something first. Or if you should pretend not to notice the way your posture stiffens whenever he's in your general vicinity. You take another glance at him through your peripheral vision.

He still has that same unreadable expression on his face—bored, maybe. Or focused. Or just better at masking than you are. He doesn’t say anything right away, and you’re half-preparing yourself for some comment about glycolysis pathways or the upcoming quiz that you’ve been dreading over.

But then he exhales through his nose and says, “I’ve been thinking.”

Which is a terrifying sentence coming from someone who does more thinking in one day than most people do in an entire semester.

Your gaze doesn’t stray but you raise an eyebrow. “About…?”

He pauses for a beat. A way too long beat. Long enough to make your stomach drop. Then, casually: “A collab.”

You blink. “What?”

“A video,” he clarifies, like this is something completely normal that happens all the time. “A joint one. On your account. Or mine, doesn't matter to me. Mutually beneficial, wider audience reach, strategic engagement—pick whatever reason you want.”

You stop walking. He doesn’t.

“Wait,” you say, catching up. “You mean, like… a TikTok?”

He shrugs. “Sure. That’s your area. Whatever gets views. I figure if everyone is already suspecting something, I might as well do a face reveal while I’m at it.”

Silence. Pure, deafening silence. You can’t even think of what to say. Your mouth opens. Closes. Opens again.

Because it’s not just the words—it’s the way he says them. Like it’s no big deal. Like the internet hasn’t been begging for a glimpse of his face since his third viral video. Like he hasn’t been a literal science cryptid for the past three years and now he’s just… casually deciding to unmask like it’s just something to check off on his bucket list.

“Why now?” you ask, finally. Your voice sounds weird in your own throat.

Senku lifts a shoulder, a faint smirk tugging at the corners of his mouth like he’s trying to suppress it.

“Felt like the right time,” he says, glancing at you out of the corner of his eye. “Besides, you’ve already done the hard part.”

You blink. “The hard part?”

He hums, nodding once. “Making me realize it’s not that deep.”

You blink again, brain buffering like it just hit a patch of missing code. “Wait… what?”

He shrugs again, like it’s nothing. Like this isn’t the culmination of literal years of silence and mystery and curated anonymity. “People’ve been asking for a face reveal since the beginning. I always told myself it wasn’t worth it. Kept saying it didn’t matter, that it’d just mess things up. But then you…” He pauses, and there’s this barely-there curve at the corner of his mouth. Not a smile—something quieter. More dangerous. “You made it feel kind of… harmless.”

Your pulse stutters. Your stomach flips. You don’t even have time to brace for what’s next.

“I mean, it’s not every day someone from your school logs online just to say she practically gets off to—”

You don’t let him finish. You physically can’t. Your hands are already flying up, face buried before your brain fully catches up, a sound of absolute mortification ripping out of your throat.

“Oh my God,” you groan, fingers pressing into your temples like you can massage the memory out of existence. “Please don’t say it like that. This is already, embarrassing enough as it is, The whole video was like a public humiliation ritual”

He lets out a chuckle at that. Way too satisfied with your reaction. Like he predicted it. When you don’t continue further he decides to speak up again.

“Think about it,” he says before splitting off toward his next class. “You pick the trend. I’ll show up.”

And just like that, he’s gone.

⋆.⌬ ˚𒉭 ⋆

You kind of forget about the whole thing.

Not on purpose, of course. It’s just that coursework piles up, assignments stack on top of quizzes that stack on top of projects, and somewhere between stressing over due dates and wanting to evaporate from existence after another surprise pop lab, the entire conversation with Senku slips to the back burner. Not in a “never doing that” way, but more like… “I will emotionally process this after midterms or death, whichever comes first.” kind of way.

There’s just never a good moment to circle back and be like, “Hey… remember that video idea you volunteered for? Wanna hang out and pretend we’re not both chronically online and know what we’re doing?”

Yeah, no. No way.

But then the first break in your schedule opens up—a blessed, random Sunday with no looming assignments due at 11:59, no labs, no back-to-back lectures sucking the soul from your body—and before you can talk yourself out of it, you’re typing a text.

It’s short, simple, and only took you about seven drafts before you finally sent it.

hey, i got a day off and i saw this new exhibit at the museum. thought it’d be nice.

You follow it up fast, like too fast:

for the collab that is!

Smooth. Very smooth.

He replies six minutes later.

sure. what day?

That’s it. That’s the whole text. Dry. Short. And so to the point it makes you start to question if he even wants to go, but you’ll take your chances. You send him the info—location, hours, all that—and hope for the best. Hope you don’t show up alone. Hope you don’t sit around pretending not to be stood up for a date that isn’t a date but still kind of feels like one.

But of course, who would Senku Ishigami be if not maddeningly consistent? If not a man ruthlessly punctual, stubbornly dependable, and irritatingly true to his word?

He’s already there when you arrive.

Not just there— but early. Waiting outside like it’s the most natural thing in the world, casually leaned against a concrete planter with one hand in his pocket and the other scrolling aimlessly on his phone. He’s not dressed up, exactly, but there’s something about his fit that feels intentional. Dark gray-beige slacks. Cream button-up shirt, top button undone. Black cardigan layered over it. Loose tie slung around his neck—totally optional, probably just for the aesthetic. Hair half-up in that signature man-bun style, the front strands framing his face.

You stop short a few paces away, your brain stalling mid-thought as your gaze continues to flicker up and down his form.

Because you? You are wearing a plaid skirt, a ruffled cream blouse, stockings, and boots that are way too tall to pretend you didn’t also plan your outfit, and a tote bag that’s got absolutely nothing useful inside besides your phone, wallet, lip gloss, and an emotional support water bottle.

Which is exactly when you notice it.

The colors. The textures. The vibe.

Oh my god.

You blurt it out before you can stop yourself, stepping the last few feet toward him like you weren’t just frozen in place two seconds ago. “We’re kind of matching.”

Senku glances up, and there it is. That thing he does. The slow, calculated glance from the hem of your skirt to your blouse to the edge of your bag and back up again, all while maintaining that unreadable expression. Like he’s gathering data. Like your outfit’s a puzzle he’s solving in real-time. His mouth twitches, just slightly, into something that toes the line between smug and genuinely amused.

“Yeah, I guess so…” He shifts his weight, pocketing his phone. “You look nice.”

You blink. Buffering. “You—uh. You too! I mean, not that I was—uh, yeah, thanks. You look good too.” You internally wince. Recover. “I hope you weren’t waiting out here long?”

He shakes his head, “Not really. Got here early on purpose.”

You nod, awkward and a little breathless, trying desperately not to read too much into it. You glance toward the entrance, mostly just to distract yourself in something that’s not his facial structure or the way the light catches on the slope of his nose.

“Should we… go in?” you ask, gesturing toward the doors. He hums, a quiet sound, like he's still mildly amused, and nods, stepping in beside you. Not ahead. Not behind. Right beside.

You scan your tickets at the entrance, hands just barely steady, and try not to overanalyze the exact distance between your shoulders. You try not to notice the faint smell of something clean and earthy—maybe his shampoo? Maybe something herbal?—that drifts off of him every time he turns to speak. You try, in vain, to be normal.

The museum’s quiet. Dim lighting. Cool air. Echoes of hushed conversations and soft-soled shoes against the polished floors. The first exhibit is drowned in amber lighting and filled with fossils in glass cases. You both drift to the same one without speaking, reading the plaque in tandem, standing so close your elbows almost brush.

He speaks first.

“Cretaceous, huh,” he says, voice low and a little warm, like he’s half-talking to himself. “Not exactly cutting edge, but still cool.”

You blink at him. “Are you—are you seriously judging the dinosaur bones right now?”

He glances at you. “Just saying, there’s been more interesting finds. I’d rather see a well-preserved stromatolite, personally.”

You snort. Actually snort, and he grins, which is possibly the worst thing he could do because now you’re staring at his lips and—

“God, you’re such a nerd,” you mutter, grinning before you can help it.

“And you’re not?” He raises an eyebrow, tilting his head slightly as if daring you to lie.

You scoff, turning back to the plaque like you can hide behind a block of educational text. “Yeah, okay, fair. But at least I pretend to be normal in public.”

“Mm. Is that what this is?” he says, and he doesn’t even try to hide the smile this time. It’s subtle, just a twitch at the corners of his mouth, but it makes your stomach do a little flip anyway.

You don’t answer. Not right away. You’re too busy trying not to combust.

You keep walking, slowly, drifting from case to case. The exhibits start to blur together after a while—early mammals, glacial imprints, fossilized flora—because your brain is short-circuiting every time his voice dips a little lower to point something out, or his hand lifts to gesture near your shoulder, or his sleeve brushes your arm.

You can tell he knows it, too. Maybe not the full extent of your internal spiral, but enough to sadistically enjoy how flustered you get. He’s not smug about it, nor cruel. Just quietly observant. Like he’s keeping a mental note every time your breath hitches a little or you laugh a beat too fast.

Somewhere between the meteorite collection and the preserved taxidermy wing (which he naturally had opinions about), you start filming. Nothing extravagant. Just quick clips on your phone—soft pans over the displays. He doesn’t comment, doesn’t shy away when the camera catches his shoulder or the back of his hand. Just lets you do your thing.

You’re halfway through the museum when your feet start to ache (your fault for wearing boots with no sole support) and your stomach lets out the saddest, weakest little growl. Senku hears it, of course. He doesn’t say anything—just jerks his chin toward the small, in-museum café tucked into the corner past the rotating exhibit, and heads that way without needing a response.

You order something simple. He does the same, and somehow, magically beats you to pulling out your wallet and paying. And then you both end up at a tiny table tucked near the window, warm afternoon light refracting through the glass and shining just right. You’re pulling your phone out again before you can really think about it.

He raises an eyebrow when he sees you tying—and failing—to discretely smile at your phone.

“I know that face,” he says, stirring his coffee. “What are you scheming?”

You grin, wide and sweet and a little mischievous. “You said I could pick the trend.”

“Unfortunately,” he mutters, setting down his cup.

You show him the audio.

He watches the sample once. Then again. Then nods. “Got it.”

You give him a quick breakdown anyway—“Ok so basically we just shake hands. So you would film me first to ‘My name is Pink, and I’m really glad to meet you.’ Then you do ‘You’re recommended to me by some people.’ Then back to me: ‘Hey, ooh, is this illegal?’ And you finish it: ‘Hey, ooh, it feels illegal?’ You got that? ”

Senku just gives you that flat, unimpressed look, the one that makes it impossible to tell if he’s judging you or already planning your execution in terrifying detail.

“Simple enough,” he says. “Let’s get it over with.”

You record it in pieces. The lighting’s good, the cafe’s not too crowded, and somehow, despite the secondhand embarrassment threatening to combust your entire being, you pull it off. You film each other, trade off holding the phone, and try your hardest not to start laughing as you record Senku's deadpan face. By the time it’s done, your face hurts from holding back a smile, and Senku looks a little too smug for someone who just debuted on the internet via meme format.

You save the clips to your phone, already planning how to edit it later.

You both take your time finishing your drinks after that—talking more now. About the exhibit, about the parts you skipped, about other museums you like. The vibe’s different. It’s looser, comfortable in a way you didn’t fully expect to get this quickly. He’s still sarcastic, still has that flat tone and know-it-all quips, but now he says your name a little softer. Looks at you a little longer when you talk.

Eventually, you both stand, a little reluctant but you both know you should leave before it gets too dark. The sun’s setting once you step outside the museum, casting everything in that amber-gold glow again, and it makes his profile look unfairly cinematic as he stretches.

“You’re surprisingly tolerable company,” he says as you walk out together.

You scoff. “Wow. Thanks. I’ll be sure to put that in my LinkedIn endorsements.”

“I’m just saying,” he replies, glancing at you, “You’re not as obnoxious as most people.”

You bump your shoulder into his. “Aw, you like me.”

“I didn’t say that.”

“You implied it.”

He doesn’t argue with that, which might be worse.

The walk back is slow. Neither of you really rushing, just sort of drifting through the early evening like you're trying to stretch out the time you have together. Somewhere between chatting about your favorite childhood shows and bickering over whose major has more long-term debt attached to it (his argument: “You can’t put a price on revolutionizing orbital propulsion”), it hits you how easy this is.

And more dangerously—how fun. You can’t remember the last time someone made you feel this keyed-in without even trying. Like your brains are constantly sparking against each other like flint and steel.

Then he says something offhanded. Something completely innocent. He’s explaining something about a propulsion system prototype—specifically, fluid resistance and force ratios.

“It’s all about tension and release,” he says, absently adjusting his sleeves as he walks. “That’s how you maintain velocity without risking collapse.”

You glance at him sideways, smile sinisterly curling at the corners. “Mm. I’ve got some tension I’m sure you could release.”

He stops. Stops walking. Like his operating system just force-quit.

“…What?”

You keep walking a few paces before turning to look back at him, mock-innocent. “What? I’m just being honest. You should be more careful with that mouth of yours, Ishigami. You’ll feed into the online delusions.”

He blinks once. Twice. Visibly buffering. You can see it—like the gears in his big science brain just misfired, unable to reconcile engineering terminology with whatever the hell that was. His ears go a little pink—barely there, but enough to clock if you’re looking for it. Which, obviously, you are.

He clears his throat, and mutters something under his breath about “not being responsible for your interpretations.”

But he keeps talking after that. He can't help it now. Neither of you can. The conversation never drops again, not even as you split off at the corner of campus, your fingers still curled around your phone like it's holding the rest of the evening in its little glowing blue-light screen.

You go home buzzing. Not from the caffeine. Not even from the TikTok you’re already editing. But from him.

Because if there’s one thing that’s true about you—it’s that once you start liking someone?

Oh, they never get to rest.

Extra notes time again! || Sorry I really didn't feel like writing out the trend and like the comments and stuff again… I physically cant think like that anymore

Anyway! Both your respective fans go crazy when the initial collab drops

Comments and dm’s begging you guys to post together more—and I mean, who are you to deny the fans?

You make appearances in all of his videos where he “needs” an extra pair of hands

And he’s always seen in your “what i do in a day” videos or weekly vlogs

The tension on camera is undeniable and everyone is always asking if there's something going on, but neither of you ever respond.

⋆.⌬ ˚𒉭 ⋆

After that, you two just… keep hanging out. Off campus, mostly. Call them dates, call them… whatever—no one’s really labeling it, but they keep happening. Even in a group, you and Senku have your own orbit. It starts with subtle things. Shared glances, half-smirks, a sarcastic “oh really?” muttered under your breath every time he says something too smug. He always responds with a coy, “Don’t look at me like that unless you want something,” and you always raise a brow and say, “Maybe I do.”

You’re both like that.

Witty. Sharp. Teasing.

During stargazing, you’re lying side-by-side on a scratchy old blanket, staring up at the sky when he starts pointing out constellations, spouting off facts like an open textbook. You interrupt mid-sentence with, “Is this your way of seducing me? Because it’s working.”

He glances at you sideways. Doesn’t even pause. “You’re the one lying next to me under the stars. I’d say the seduction’s mutual.”

And at the beach? The energy’s dialed up even more.

You’re in a bikini under his oversized button-up, hair still damp from taking a dunk in the ocean, when you say something cheeky like, “You’ve been watching me all day. Just admit it.”

He doesn’t even blink, much less looks at you. “I’m studying gravitational pull in action.”

“Oh?” you hum sweetly. “Like, my body’s gravitational pull?”

“I meant the tide,” he deadpans. “But your ego has its own orbit, so sure.”

You throw a handful of sand at him. He dodges. Barely. And then throws a precise, infuriatingly accurate clump right at your ankle.

Even when your schedules are packed, you somehow always find time to circle back to each other.

There’s never been a conversation about what it is between you, but neither of you need one. You’ve both carved a little space into each other’s lives now—distinct, irreplaceable, and entirely yours. No one else quite fits the shape.

So it’s no surprise that you spend a lot of time in each other’s dorm—or in this case, Senku’s off-campus apartment. Sometimes for studying when the library’s full, but mostly just to hang out in the comfort of each other's presence.

You’re dressed in low-rise sweats and a tank top, now buried beneath one of Senku’s old sweaters. The one he threw at your head earlier after you started loudly complaining about the cold. The sleeves cover your hands, and the collar’s stretched from years of wear. It smells like detergent and something vaguely medicinal—like tea tree or menthol or maybe him.

He’s at his desk, deep into some spreadsheet or CAD model, muttering to himself about air resistance. You’re flat on his bed, legs swinging, phone held above your face as you scroll through TikTok with the sound barely audible. Every now and then you giggle. Sometimes you send him one. Sometimes he looks away from his screen to actually watch it.

The silence isn’t awkward. It never is with him. Just the quiet clack of his keyboard, the soft hum of his laptop fan, and whatever sound bytes your phone decides to throw at you next. It’s routine by now. Domestic, in a weird way.

He leans back in his chair eventually, spinning halfway to glance at you. “Hey,” he says, like he didn’t just finish modeling an entire turbine blade. “In class the other day—when Takahashi brought up reward pathways—you didn’t say anything. You disagree with the textbook stuff?”

You glance over your phone, one brow raised. “What, the dopamine bit?”

He nods. “And the serotonin model. You looked like you were biting your tongue.”

You shift onto your side, propping yourself up on your elbow. “I mean, yeah. Kinda. The textbook oversimplifies it. Dopamine’s not just a ‘pleasure’ chemical. It’s tied to motivation, reinforcement, emotional memory—like, the anticipation of reward, not just the reward itself.”

He’s still watching you. “Go on.”

And that’s all the permission you need. You sit up straighter, words spilling out like second nature. You talk with your hands, tangents spiraling into other tangents—sliding effortlessly into a topic you’ve buried yourself in for years. Limbic circuitry, behavioral loops, cortisol inhibition. You explain how physical touch spikes oxytocin and drops heart rate variability, how endorphins are natural painkillers, how the brain is wired to crave proximity.

Senku’s not even pretending to work anymore. His laptop’s still open, screen glowing against the side of his face, but his eyes are all on you—sharp, focused, borderline amused.

He hums. “So… theoretically,” he says, tapping his pen against his lip, “if someone were, say, stressed. Touch could help regulate that.”

“Yeah,” you nod, without hesitation. “That’s why hugging works. Holding hands, even brief skin contact; it’s all connected to emotional regulation. Even something like—”

You pause. Shouldn’t say it. But do anyway.

“—making out.”

There’s a pause. One beat. Two.

You glance at him. He’s still watching you, face unreadable. “Making out?” he repeats slowly.

You shrug, casual. “I’m just saying. High dopamine, high oxytocin, a little adrenaline from the novelty? Basically a neurochemical cocktail.”

His head tilts, expression unreadable. Then, like it’s the most normal thing in the world:

“Wanna try it?”

Your brain blanks. “What?”

“You’re the one who brought it up.” He says it flatly. Almost like he’s bored. But there’s a twitch at the corner of his mouth, and his eyes haven’t moved from yours once. “For science. Of course.”

You stare at him. “You’re not serious.”

He shifts to stand, lazy and unbothered. “Why wouldn’t I be?”

And then he’s walking over, bracing a knee on the mattress beside you. You stay frozen. Your heart is in your throat. Or maybe your stomach. It’s hard to tell with the way it’s pounding. He leans in just enough that you can feel his breath, hovering, giving you a chance to pull away.

You don’t.

And that’s all it takes.

The kiss is warm. Careful at first. Testing. You breathe out against his mouth, one hand finding the front of his hoodie and fisting it without thinking. He shifts, deeper into it, his weight pressing into the mattress as he moves over you. Still careful, but less hesitant now. Focused. Like he's calculating every angle, and still surprised by the result.

His hand finds your waist. Yours slide up to his neck.

You’re not sure when it stopped feeling like a joke. But it doesn’t feel like one now.

He shifts again, weight fully settling over you, a knee anchoring beside your hip as he deepens the kiss. His hands are warm—calloused in the way only someone who spends too long with tools and lab equipment can be—sliding up beneath the hem of his own sweater draped over you. Fingers brushing your bare skin tentatively, like he’s cataloging each reaction, each hitch in your breath.

Your arms move to curl up around his neck, pulling him closer, and your fingers find his hair. Tugging gently, then a little harder. He exhales into your mouth like it startled him.

You smile into the kiss—just a little. And he kisses you harder.

There’s something methodical in the way he touches you, like he’s studying even now. Testing reactions. Adjusting accordingly. But it’s not the detached, cold type of analyzing. It’s quiet intention, attentive hunger. The kind that says he doesn’t let himself want things often. But he wants this.

Wants you.

The sweater slips slightly off your shoulder. His palm follows the curve of your spine like it’s a path he’s memorizing. You’re already pulling him back down the moment he shifts to rise, needing more—needing him. He goes willingly. He always does.

His lips hover near your neck, and when he finally presses them there, it’s with purpose. A mark, claiming. You feel the heat it brings you all the way down to your core.

“You react so easily,” he murmurs, voice low and smooth, like he’s more fascinated than surprised. “Like your body’s just waiting for me to touch it.”

You hate how right he is. Or maybe you don’t. Not when his hands are gliding down, lower and lower, caressing the skin of your ribs to your hips.

⋆.⌬ ˚𒉭 ⋆

Senku almost feels bad for baiting you with that question earlier. Almost. If it weren't for the way you were staring up at him, all teary eyed, lips swollen and neck marked—courtesy of him, of course—he’d probably apologize. But he has you exactly where he's been wanting you, and you’re definitely not complaining, if the way you're squeezing around his fingers have any say in the matter.

“Fuck… you're tightening up. Are you close already?” he’s cooing down at you, eyes gleaming with a sort of sadistic look, his lips curled into a smirk.

You can't even respond, it's pathetic really, your brain is already turned to mush and he's barely even touched you. You tear your gaze away from him. Your legs are shaking, twitching uselessly at your sides, and you can feel just how wet you are, can hear it every time his fingers sink deeper into you.

Why did he have to be so good at this?

“You’re really that sensitive, huh?” he mummers, dragging his thumb just barely over your clit and he chuckles when your body jerks forward. Your thighs try to close but he’s already in between them, his other hand prying them open, keeping you exposed and needy under his touch.

He’s transfixed on the sight of you. Watching every twitch of your hips, every spasm in your thighs, every time your walls clench around his fingers, the way your eyes roll back when his fingers prod at a particularly sensitive spot. And, of course, the way you bite down on the back of your hand in an attempt to muffle the sounds spilling out of your mouth.

God, it turned him on in more ways than he possibly imagined.

Senku leaned in, his lips brushing the shell of your ear, just to watch the way you squirm. “C'mon,” he breathes, his voice barely above a whisper, “don’t hide from me. I want to hear everything.”

You whimper at that—a soft, choked sound, and he feels it all the way down. His cock throbs in his pants, neglected, untouched, but he doesn’t care about that right now. Now when this is happening. Not when you’re this responsive, this wrecked just from his fingers. And so… Senku moans. Deep and guttural like your reaction does something to him. Like watching you get off is more satisfying than touching himself could ever be.

The way your body moves against his hand is erratic now, your hips shifting up to match the pace of his thrusts, trembling on the edge. He can feel it in the way your walls flutter around him, can see it in the way your lashes are soaked with tears, the way you jerk with each slow curl of his fingers.

You’re close. So, so close.

So he gives it to you—just the right rhythm, the right amount of pressure, and that voice again, like a switch flipped inside of him:

“Go on, baby, it’s okay. Be a good girl and come for me.”

And you do. Practically sobbing into the sheets as your body shudders around him. Your muscles tighten,back arching off the bed, and breath hitching in your throat before it spills out in a loud, desperate moan. And Senku swears he almost loses it just watching you. Watching what he did to you.

“Fuck, that's it… just like that.” He’s a little breathless now, still working you through it, fingers moving gently as you shake and throb beneath him, blissed-out and absolutely ruined. Even as he pulls his digits out, and licks them clean, your body still hasn't stopped twitching.

You're sprawled out beneath him, brain soft and heavy, your thighs sticky, your chest heaving. There's a buzz under your skin you can't seem to shake—like your body hasn't figured out the comedown yet. Like you're still coiled tight, waiting to snap again.

Senku's still above you, propped on one elbow, eyes dragging slowly over your face like he's trying to memorize the exact expression you're wearing—ruined, flushed, lips parted, still trying to catch your breath.

And when he speaks again, his voice is low and rough, the edge of smugness barely masking the heat beneath it. "You should see yourself right now." He leans closer, nose brushing yours, lips just barely hovering. "You came so hard, baby."

You should roll your eyes. Should say something back. But instead, you kiss him. It's clumsy at first—your hands reaching for him, fisting into the front of his shirt, dragging him down with more desperation than you meant to show. But he goes down willingly, groaning into your mouth like he's been waiting for it, like he's starving for you.

His lips are warm and soft, and when his tongue brushes against yours, something in you snaps. You moan into it, tugging him down even closer, legs shifting to wrap around him until he’s fully on top of you, pressed chest to chest.

The kiss turns filthy fast. Sloppy. Hungry. You taste yourself on his tongue, feel his teeth graze your bottom lip, and when you break apart for air, there's a thin string of saliva still connecting the two of you.

Senku stares down at you, his lips pink and wet, eyes dark with an unmistakable desire. But you don’t say anything. You just drag him back down and kiss him again. And this time, you take control.

You find the strength to gently shove his shoulder. A silent request for him to switch positions, this time with you on top. Your hands slip between your bodies, fingers tugging at his waistband, undoing buttons and zippers with trembling precision. You don't rush it, you don’t even speak. You just stare down at him, eyes locked on his, and you let your palm glide over the front of his boxers—feel how hard he is. How long he’s been holding back.

"You didn't touch yourself," you whispered against his jaw, lips ghosting down to his neck. You kiss the column of his throat. You can feel his adam's apple bob under your mouth. "You just... watched me."

Senku shudders, eyes fluttering shut as he hisses through his teeth. "Of course I did," he says, voice low, breath hitching when your hand dips beneath the fabric and wraps around him. "You think I could look away from you like that?"

You smile into his skin, lips dragging over his pulse point, before licking a small stripe against it, warm and possessive. "Then you're gonna let me return the favor."

He tries to say something, probably a snarky comment, or some teasing remark, but it dies in his throat the second you stroke him. Thumb pressing over the tip, spreading the pre-cum, watching his face go soft and slack and honest. His cock twitches in your hand, and he groans-deep and low, like he's trying to keep quiet and failing.

"You're so responsive,” you murmur, voice dipped in faux sweetness. "Bet I could make you come just like this—barely even touching you."

His head rolls back as he nods.

"You'd let me?"

"F-fuck," he breathes, biting down on a groan as your pace picks up, "I'd let you do anything right now."

And there it is-that crack in his composure. The unraveling. You've got him now, pinned under you. Your hands, your voice, your mouth ghosting back up to kiss him again while you work him with steady, torturous strokes. And you swear he looks like he's about to lose it just from that.

"You're close," you whisper, forehead pressed to his, your hand never stopping. "Aren't you?"

He nods again, faster this time, eyes wide, and dazed. You find him beautiful like this.

“it’s okay,” you whisper, kissing the corner of his mouth, “Come for me, and don't look away."

He doesn't.

You watch each other the whole time-while his body tenses, his breath catches, and he spills into your hand with a whine—it’s with your name on his lips. And even after, when he's still trembling, breath ragged, forehead resting against yours, he kisses you again.

It’s softer now. Slower, more sensual. Like he’s trying to catch up to everything that just happened.

You climb up to adjust your position, shifting in his lap to properly straddle him, and feel him twitch beneath you. The air thickens again. You start to move—slow, subtle grind that makes both of you gasp.

“Is this okay?” you murmur, lips brushing his. “We don’t have to…”

His hands find your hips, tentative, but firm enough to tell you he doesn’t want you to stop. “Y-yeah,” he swallows hard. “Just—condom. They’re in the nightstand.” he adds, voice barely above a rasp.

You pause, looking down at him, your hair falling into his face as your lips curl in a slow, nervous smile. “I kind of just want to feel you,” you say softly. “Just you.”

His breath catches, and his grip on your hips tighten. “You’re gonna ruin me,” he mutters, tone somewhere between a joke and the truth.

“I’m on the pill,” you say, brushing your thumb along his cheek. “And I haven’t been with anyone. Not since we started hanging out…”

His gaze locks with yours—surprised, a little shy. “Me neither.”

There’s a beat. Neither of you says it—what this means, or where it’s going—but you don’t need to. Not right now.

You lean in and kiss him again, deeper this time, while he lets you settle over him fully. And when he finally lets go of whatever he’s been holding back, it’s not a fall. It’s a full body surrender.

You shift your hips, sliding your hand between your bodies. Senku watches you, wide eyed and panting, as your fingers wrap around him once more. He’s still hard, heavy and warm in your hand, and the sound he makes when you stroke him again makes your head spin.

His hands tense on your thighs. "God," he whispers, barely holding on. "You-you don't have to—"

"I know," you say softly, guiding him to where you want him. "I want to."

You angle yourself, breath catching as you line him up. He sucks in a sharp breath, eyes locked on where your bodies meet, like he can't believe this is happening.

And when you start to sink down—inch by inch, taking your time—his head falls back against the pillow, lips parted, throat working like he's trying to remember how to breathe.

You stop halfway, adjusting your hips, one hand braced against his chest. He feels so good stretching you open like this. You look down at him.

He nods, frantic, his voice almost breaking.

"Yeah. Just—don't stop. Please."

You don't.

You ease down the rest of the way, and when you're fully seated, hips flush to his, both of you just stay there for a second, gasping, trembling, overwhelmed. And when you finally start to move; the slow, steady rolls of your hips—his hands come up to grip your waist like he's afraid he might actually fall apart under you.

At first, it’s easy to stay in control. You set the pace, savor the friction, chase the tension building in your belly.

But it doesn’t last.

Your thighs start to burn, trembling with the effort, barely cooperating anymore. Every bounce turns sluggish, your movements dragged down by the growing heat in your limbs—but you're still moving. Still trying. Because he's looking at you like that.

Senku's laid out beneath you, hair a mess, lips kiss-bitten, and pupils blown so wide there’s barely a sliver of red left. And he’s watching you. His gaze is steady, and intense—like he sees everything. Like he’s not the one unraveling here. You are.

And through the fog in your head, it hits you that he’s smiling.

Not mockingly, just this small, breathless grin, like you’re an experiment he doesn’t want to stop testing. And the way he says your name, low, and rough, like he’s been holding in his mouth for months, sends heat crashing right through your core.

You try to keep moving, but your body stutters. Your breath shudders.

He doesn’t move. He doesn’t have to.

He just says, “You're falling apart, aren’t you?”

You don’t answer. You can’t. And then he speaks again, a little more sure this time.

"That's it, baby. You're doing so good for me... just like that."

His voice—God, his voice. It's low and thick and soaked in wonder, like he can’t believe this is real. Like he can’t believe it’s you. You nearly fold right there.

The noise you make is somewhere between a sob and a moan, your hands scrambling against his chest like you need something to anchor you, or maybe just him. Your whole body pulses at his words like they hit deeper than anything else, heat unraveling inside you faster than you can hold it together.

"F-Fuck, Senku..." you whimper, blinking through tears, hips faltering as you try to keep the rhythm. "I c-can't—"

"Yes, you can," he murmurs, fingers tightening just a little on your thighs, just enough to remind you he's there, guiding you, grounding. Not pushing—never pushing. Just wanting. "You're already doing it.”

His voice dips again, breathless. “Look at you..."

It’s awe. Pure, undiluted pleasure. Every word that falls from his lips sounds like it’s unraveling him as much as it is you. And somehow, that’s what undoes you more than anything

You bury your face into his neck, because if you look at him again you'll crumble-and maybe that's the point. Maybe that's what he wants. To break you down, piece by piece, until you're too far gone to think about anything but how good he makes you feel.

And God, he is breaking you.

He drags one hand up your back, fingers threading through your hair, just to keep you close. He needs you close. Needs you to feel how much he's coming apart beneath you. He's grounding you, ruining you, worshipping you with every tremble in his touch.

"Just one more," he whispers, lips brushing your ear. His voice is strained, like he's barely holding on. “Just give me one more…”

He's losing control fast. Your soft, whiny little sounds are killing him. Every breathy moan, every gasp, every whimper—you're driving him insane, and maybe, just maybe, that's what gives him away.

The way his voice breaks when he speaks again.

"God-you feel so good," he chokes out, hips stuttering beneath you. "You're so—fuck, you're perfect around me, I can't—"

He whines-actually whines—a raw, desperate sound ripped straight from his throat, like he doesn't know how to hold it back anymore.

"I c-can't stop," he breathes, hips twitching up into you without rhythm now. "You're—you're making me crazy—how are you so fucking—tight—?”

You make another sound—desperate and broken—and he feels it. The way you clench around him, the way your whole body answers before your mind can even catch up.

And then, softer-almost pleading:

"Let me hear you when you come, yeah?"

You whine—God, you whine—and he groans, like the sound physically does something to him. His hands are shaking now, trying to hold you steady while everything inside him unravels.

The way you look, the way you sound, the way you're still trying to ride it out, still trying to give him what he wants even as you fall apart on top of him. It's too much.

And he wants more.

Your name falls from his lips again-raw, reverent, broken at the edges-and it hits you deeper than anything else has all night.

You try to keep moving, but your body betrays you. Your hips falter, your thighs tremble, and your forehead presses against his collarbone, like hiding might save you—but it doesn't. He's still looking right at you, and God, he's still talking.

"Just like that... you're so—fuck, you're so perfect like this."

His voice is breathless, thick with disbelief and need. "I can feel you... every time you move, I-shit—"

And maybe you don't mean to do it. Maybe you're just grabbing onto something—anything—to stay grounded. But your fingers slide up into his hair, tugging just a little. And he moans.

Full-bodied. High-pitched, desperate, absolutely shameless. His eyes slam shut. His hips jerk up into you with no rhythm, just want. "Shit–do that again—" he gasps, voice cracking. "Please–fuck—!"

So you do.

You fist your hand in the mess of his pale strands and pull.

He falls apart.

"God—I'm–fuck, I'm coming—" The words are slurred, ruined, his face pressed into your hair as he bucks into you once, twice, and then spills inside you with a choked-off moan. His hands fly to your hips, gripping tight, like he's trying to keep you locked to him, like if he lets go for even a second he'll die.

You're already shaking, breath stolen out of your lungs, your own release crashing through you. You sob into his hair, overwhelmed, while he trembles beneath you, hands still gripping, body still twitching.

When you finally still, everything is quiet. Just your breathing, his heartbeat, frantic against your chest. Your fingers are still tangled in his hair. And he hasn't stopped shaking.

You don’t move for a long moment. You just melt into him, limp and boneless, your forehead pressed to his shoulder, your chest rising and falling against his. He’s still inside you, still warm, still twitching faintly with aftershocks. And even though your muscles are shaking and your skin is flushed and sticky, all you can do is breathe.

Senku doesn’t speak right away either. He wraps his arms around you, his hold is loose at first—like he’s not sure he’s allowed—and then tighter, like he can’t help it. Like letting go now would undo him. His voice is hoarse when he finally whispers, “You okay?”

You nod into his neck, barely moving. “Yeah. You?”

He lets out a shaky breath, something between a laugh and a sigh. “I think I’m still alive.” He says. “But barely.”

You smile, eyes closed, cheek pressed to his skin. “Was that…?”

“Yes,” he says instantly, like you needing to ask the question is absurd. “Don’t even finish that sentence.”

You laugh softly and feel him grin against your temple. There’s a pause—comfortable, heavy with the weight of what just happened—and then he shifts, brushing your hair gently away from your face.

“I didn’t… hurt you, or anything?”

“No,” you murmur. “You were perfect. Seriously.”

You finally lift your head, just enough to look at him. His hair’s a mess, his cheeks are still flushed, and his eyes are glassy—but he’s smiling. Soft. Uncertain. Happy. And for a moment, he’s not the genius, not the scientist, not the voice behind a screen.

He’s just a boy, flushed and messy, still a little out of breath, and completely, irreversibly gone for you.

You lean down and kiss him once—just a press of lips. Nothing more. Then you collapse on top of him again with a soft groan.

“We should probably clean up,” you mumble into his chest.

He hums. “Eventually.”

Neither of you moves.

⋆.⌬ ˚𒉭 ⋆

Later, you do get up—clean up, change, all that boring post-mindblowing-sex routine—but it’s quiet. Natural. And once you're both back in bed, it’s like gravity pulls you together again without even trying.

The room’s quiet, warm, filled with the soft hum of your joined breathing. Your legs are tangled beneath the sheets, and your head is tucked under his chin, chest rising and falling against his.

Senku’s still. His hand hasn’t moved from your back, fingers lazily tracing the curve of your spine like he doesn’t know how to not be touching you now.

And then, without looking at you, he says quietly:

“…So is this the part where we pretend that never happened?”

You blink. “…Do you want to pretend that never happened?”

He’s silent for a moment too long.

“No,” he admits. “Not even a little.”

You shift just enough to look up at him. His hair’s still messy, cheeks still faintly pink,and there's a light trace of sweat on his temple, but his eyes are sharp, focused on you now in a way that makes your breath hitch.

“I’m not exactly…” He hesitates, frowning slightly. “Good at this stuff.”

You smile. “Sex?”

“No. Well—” His ears go red. “That too. But I meant… this. Whatever this is. Relationships. Wanting someone this much. Letting them in.”

You don’t say anything right away. Just reach up, gently brushing some of his hair out of his face.

“Senku,” you murmur, soft and certain, “you don’t have to be good at it. We’re figuring it out together.”

He swallows, throat tight. “…You’re not gonna run when you realize I’m not exactly the most conventional partner?”

You blink, lips twitching. “After what just happened? I’m definitely not running. I can barely walk.”

He huffs—almost a laugh. Then finally, finally, he meets your eyes again. Really meets them.

“And besides,” you add softly, “I knew how you were before all of this. I’m your friend first, always. I love you just the way you are.”

“I didn’t mean to fall for you,” he says, blunt in that way only Senku can be. You were just… there. Constant. Loud. Infuriatingly smart. Always messing with my things, always in my space.”

You raise an eyebrow. “You’re digging a really deep hole right now.”

He exhales—short, almost a laugh. “Yeah, well. Then one day I realized I didn’t want any of it to stop. I didn’t want you to stop. I think that scared me more than anything.”

Your lips twitch. “You call that romantic?”

“I’m a scientist,” he deadpans. “Not a poet.”

You grin, pushing up slightly so you can lean over him, your hands braced on either side of his head.

“Well,” you murmur, eyes soft, “guess I’ll have to be the romantic one.”

His eyes flicker to your lips, then back to your gaze.

“You always were.”

You lean in and kiss him—slow, like it’s not a first or a second or a tenth, but something you’ve always had the right to do. He kisses back like he’s finally letting himself want you out loud. When you pull away, you rest your forehead against his again, noses brushing. His hands drift to your waist under the blanket, not trying anything, just holding.

“…So,” you say softly. “What do we call this now?”

He hums thoughtfully. “An unplanned but highly successful chemical reaction?”

You snort. “Try again, scientist.”

His mouth quirks. “Girlfriend acquired?”

You blink. “Did you just say that like you unlocked an achievement?”

“I say that every time I make something new in the lab,” he says, matter-of-factly. “Why would this be any different?”

You roll your eyes, but your heart is doing dangerous things in your chest. “God, you’re such a dork.”He shrugs under you. “Yeah. But I’m your dork now. Apparently.”

Ignore the lowk OOC last line… genuinely couldn't find another way to end this quickly

ANYWAY BACK TO THE EXTRA NOTES!

You guys both go kind of MIA for a while; one second you’re posting like normal, sometimes popping up on each other's page, then just… radio silence.

Fans lost their minds, and during your time away, they start making these crazy long theories trying to explain what they think happened to the both of you to fill the void.

Literally ranging from, "He's secretly a serial killer and she was the last victim so he deleted his digital footprint to evade capture.”

“They eloped in the mountains. She’s pregnant. They’re living off the grid with goats.”

“She accidentally killed him during an experiment and is covering it up.”

All of these are objectively incorrect.

In reality? You’re working through your first relationship, and when you’re ready, you’ll both be back.

an: can't blame anyone but yk I gotta be rude to my kitten whiskers bella... already tagged her though so sigh... anyways this was supposed be DAYS ago but I kept adding more stuff. this is the cycle of my life , I can not shut up for the life of me.

I also haven't written smut in a while (can you tell?) so if its bad.. yeah, I tried my best fr. lowk a closeted freak ONG do not leave me in a room with Senku he WILL end up pregnant.

ok that's it, until next time!

taglist: @lovingyeet

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