pairing: uni student!sunoo x uni student!reader
includes: HELLA NSFW at the end (MDNI); oral (f receiving), p in v, both sunoo and reader are teases, they talk a lot during too idk why I did that but we’re learning, they take turns getting shy and nervous, grumpy x sunshine in a way, there’s probably something I’m forgetting.
you tutor sunoo in calculus despite everyone telling him you’re bad news and he develops a major crush on you after each session until he does anything about it.
♱⋆ཐི˚₊‧⁺⁺‧₊˚ ཐི⋆♱𓆩^._.^𓆪♱⋆ཐི˚₊‧⁺ ⁺‧₊˚ ཐི⋆♱
Your name comes up, and some people narrow their eyes and lean away from the person who mentioned it in the first place.
No one has ever seen you with a group of friends, and you’ve never been the type to get spotted at the school’s library or cafes.
It’s like you materialize in your seat at a class and disappear into thin air the minute it’s over.
But how bad could you really be?
Apparently, you have a habit of sleeping in your classes, yet you’re one of the highest-performing students in almost all of them.
And Jake, who’s part of a peer-tutor-program for the school, knows about you enough to tell Sunoo that he’d prefer to tutor him himself in a subject he’s never studied if it meant Sunoo could avoid you.
But Sunoo is too nice for that.
The arrangements were made, and an agreement to see you at one of the school’s libraries was set for that following Friday.
And even if there was something off about you, he wanted to give you the benefit of the doubt.
After all, it was your professor who asked you this as a personal favor, so there had to be more to you than what people think there is.
Yet, as he settles into a chair in front of you, he can’t help but feel uneasy.
You don’t really smile, and you have really heavy eyes that are made more prominent by the bags under them.
And your hair and clothes might look clean, but everything about you is messy; from the way your hair is pushed up to how baggy your clothes are.
It’s childish and maybe a little ridiculous, but he can see where the rumor about you being a ghost came from.
He’d already introduced himself, so what are you waiting for?
“Professor Kang mentioned you took his class last semester, are you his TA this semester?” He asked, trying to find something to start a conversation with.
“I am,” you answer simply, a small nod.
You don’t make it easy to talk to you, but there’s no getting out of this now.
“So-“ he begins, but you speak first and don’t stop to do that little thing where people go back and forth to let the other speak.
“Can I see your midterm?” You ask, staring at him almost blankly.
“R-right…” he sighs softly.
He’s both embarrassed by what you’re about to see and also awkwardly trying to adjust to you.
He slides a paper towards you and sits there quietly while you analyze his exam.
“Do you…watch videos on the subject instead of reading the textbooks or studying the lecture notes…?” You ask, looking up at him with a slight crease in your brow.
How you were able to tell this just by looking at his exam is freaky, and you might just be some kind of psychic ghost stuck haunting a university.
“How did you…” he trails slightly. Maybe he should just be honest and take what he can from this one session.
“You wouldn’t say Professor Kang speaks too fast?” He quickly follows up, trying to find something plausible that you could also relate to.
“That doesn’t change the fact that your understanding of limits and continuity is based off the wrong type of calculus.” You explain.
Your words could be taken as blunt or even a little rude, but Sunoo can recognize that you’re just trying to do what you were asked to do.
You spend the next two hours just on this one topic alone.
And in that time, he found that you’re not so hard to be around.
The longer he spoke to you, the more he learned that you’re not as stiff or intimidating as you initially seemed.
And he did learn a lot from you—so much so that he ended the session asking when you’d be able to tutor him again despite originally believing he’d just attend one.
Honestly, you could have been worse.
You could have been pretentious, maybe a little snobby; but instead, you were helpful and straightforward, which is hard to get from people seeing as everyone’s always trying hard to impress those around them.
The more he saw you, the more people asked him about you.
Mostly asking if he could confirm or deny the rumor that you were a cheater and didn’t actually know the material you studied.
Or if he’d learned anything about you and could tell them if you had a relative in the school who was altering your grades for you.
It sucked that no one believed him when he only ever answered that you were just as smart as your record said you’d be.
Actually, it only looked like Sunoo was being let in on your secrets to pass classes and he had no intention of sharing.
And, after his opinion of you changed, it never went back to what it used to be.
Especially not after he started to realize that your appearance and way of behaving was a consequence of your exhaustion.
After he learned that you work two full-time jobs in addition to being a full-time student, it made sense why you looked the way you did.
And now that you’d gotten closer through your tutoring sessions, he started doing little things to say thank you and also to look out for you.
If he found out you hadn’t eaten by the time you got to him, he’d treat you; if you dozed off, he didn’t wake you, not until he had to; and he worked around you and your schedule, even if it meant meeting you very late at night, sometimes even in your apartment.
It got to a point where his friends were questioning the nature of your relationship.
Surely he’d learned enough, why did he still need to see you even after his retake happened?
“You’re going out…?” Jake asked, nudging Ni-ki who was tapping Heeseung to look up.
“Yeah…just a little last-minute check on an assignment I have to submit.” Sunoo explained, stuffing his laptop into his backpack.
It’s the truth; you might not be tutoring him in the traditional sense, but you’re helping Sunoo rebuild his previous understanding of calculus and he can’t help but ask for your help even with small things.
“It’s 11 p.m.” Heeseung pointed out.
Now that his shoes were on, he straightened up and finally looked at his friends directly.
“I mean, I doubt you’ll be asleep by the time I get back,” he shrugged.
“Right, but you do realize how this looks, right?” Jake asked.
“I don’t know why it matters what I go do on my own time. I don’t think I’ve ever questioned any of you where you go at night.” Sunoo says, crossing his arms as he shakes his head.
“Just…be careful.” Ni-ki says, slightly annoyed that Sunoo continues to ignore his friend’s warnings.
“I will.” Sunoo huffs, turning to leave it at that.
He doesn’t care to explain himself further when people barely believe what he says first, and if it costs him a friendship then so be it; if anyone needs a friend, it’s you, and he wants to be that if nothing else.
Despite being standoffish a moment ago, he’s all smiles once you open the door.
Some days you look better than usual; mostly when you’ve had a few days of good rest and proper meals at the right time of day.
Today is one of those days, which relieves Sunoo more than it should when he sees you like this.
“Hey” he says, entering your apartment once you step off to the side to let him in.
“Hey” you repeat, your voice softer than usual.
It’s something he’s picked up on more recently; you seem to be more comfortable around him, but only in the sense that you’re quick to answer things, even those that might not have anything to do with calculus.
You walk side by side towards the living room; he’s been by enough times to know where everything is and also know that you’re probably doing your own homework and assignments at this hour.
And he was right, because laid out on your coffee table were your notebooks and laptop, along with some takeout you seemed to have pushed off to the side.
“Do you want anything to drink?” You ask, wanting to take care of that before you sat down.
“Water is fine, thank you” he nods, removing his backpack to take up the space beside your things while you go.
As straightforward as you are, you get to business almost immediately.
And Sunoo can only sit nearby and drink water while you analyze the work he’s set to turn in the following morning.
Also more recently, he’s become more awkward around you; he won’t admit it, but the amount of praise and affirmations he receives from you do much to make him see you differently.
Have you always been this…attractive?
“You should use less vocabulary from the text, it’ll look AI generated.” You say softly, skimming through the rest of it.
“Aww…” he sighs, but secretly he’s glad, now he has a reason to stay longer.
“It’s not a bad thing though, I’ll probably end up grading it so I’ll do so with your efforts in mind.” You shrug, lowering his notebook slightly.
“You grade my work?” He asks, his expression nothing short of surprised.
You smile a little, and he finds it hard to be upset that you hadn’t told him this before.
“Professor Kang has two TA’s this semester, if it isn’t me it’s him, and I know him well enough to tell him that your work is your own.” You explain, reassuring him gently.
“So when I submitted my mock final— the one where I had a detailed explanation of why my work was incorrect and where I went wrong— was that you?” He asked, almost offended.
You purse your lips slightly, holding back a laugh.
“You’re the only one I’ve done that to.” You admit, your smile widening slightly.
“You taught me that formula— I spent hours listening to you repeat it over different equations until you burned it in my mind!” Sunoo began, a little frustrated.
“And yet you forgot to double-check that—”
“Forgot to check it with the power rule…I read your graded paper.” He scoffed, crossing his arms as he sulked.
“You still passed the mock, you’ll pass the class this semester.” You assured, a small nod.
“You think so?” He asked, looking over at you playfully.
“I do.” You answer so surely—and maybe he’s reading everything too intensely, but he isn’t making it up when he realizes that you’ve gotten much closer in the last few minutes.
“I guess that means you won’t need to tutor me anymore…” he says softly, his gaze moving lower for a bit before it picks back up.
“I mean, we share a major, we’ll always be taking the same classes…you could always call me if you’re having trouble in those…” you shrug.
Sunoo can recognize that he’s getting too close to lines that exist for multiple reasons, but you don’t seem to mind that he’s getting ready to cross them with no real conversation beforehand.
“I’m having trouble with something…not related to uni…think you can still help me?” He asks, hands now on either side of your legs as he pauses at a distance that has you just inches apart from each other.
Now your gaze shifts, and you’re picking up everything he’s trying to put down.
“I can try…” you say, less sure of yourself, and it’s the first time he’s seen you nervous.
Sunoo takes that as a hint to make a move; just a kiss to start, and he isn’t so overbearing with it that you can push him away without any real effort whenever you want to.
When the kiss progresses a little more into your hands coming up the sides of his arms before wrapping around his neck, he feels he can push a little more.
Sunoo is a great kisser, but it’s almost expected that he’d be good at something so small and that he’d be able to drag it out so it’s much more intimate than simply being a lead-up to what could be.
If this were anyone else, he’d wait a little longer to do anything like this; but there’s this overwhelming need to take care of you and bask in the aftermath where he hopes you’ll praise him then too.
Still, even if it seems like you’re on the same page, he has to make sure.
After all, this is sudden.
“Wait…” Sunoo says softly, pulling away with smaller kisses to lead up to the complete stop.
“Is this okay?” He asks, looking down at you with a flush starting to creep up his ears.
“Y-yeah…I like this…” you assure, goosebumps formed around his palm where it slid up your shirt and was resting on your low back.
Sunoo isn’t so active that he’s confident he can do all of this without being a little slow, and he’s struggling to really take over even if it’s what he wants to do.
“Here…?” He hesitates slightly.
“Maybe…we could go to my room?” You suggest, just as carefully as he’s being.
“I think I have a…” he trails, pulling away from you for a bit just to grab his backpack.
He isn’t the type to carry one in his wallet, but hopefully he has one in his backpack…the embarrassment of having to stop even just for a little to go to whatever store is nearby is too great for him to be able to face you again.
You watch as he rummages; you aren’t so active either, but girls don’t usually carry them anyway.
But just before you can suggest that he go to the convenience store nearby, a small pack is pulled out from his backpack.
For the sake of keeping things spontaneous and fun, you two try to get in your room as quickly as you can after finding this.
How he’s able to continue being respectful even as he’s undressing you is beyond you, and the whiplash you feel watching Sunoo become a different person altogether is incredible.
You expect him to be sweet, maybe a little painfully slow; but he’s actually quite eager in a way.
“Please…if you want me to stop, don’t hesitate to tell me…” he says, but he doesn’t wait much longer now that your shirt is off.
He’s doting; taking time to appreciate your body with soft kisses to your chest, your abdomen, and your stomach—and as he trails down your upper body, he’s pushing you on your back.
“Can I take this off?” He asks, his breath fanning against your stomach.
Sunoo looks pretty like this.
The way he’s looking up at you while he lays his head on your thigh, and holds it with this soft but firm hold, while the flush in his ears has started to come down his neck…god knows what he did when he created him.
You can only nod, quick to lay back flat on your back if it meant you could avoid looking at him too directly.
You brace yourself in a way, tensing up slightly once you’re laid out bare in front of him; his hands tighten around your thighs for a moment, but before you can think to be self-conscious, he gets to work.
You flinch against him, first away from him but then into him once his hands push down to keep you still.
He’s good at this too; his tongue is never in the same motion for too long, first it’s slow like he’s trying to learn you, and then he focuses on your clit once he’s sure he found it.
A shiver ran down your spine once his tongue started moving in these tight circles around it, and the minute you started relaxing beneath him, he pushed a little more.
You didn’t notice it first because he’d just started to switch between licking and sucking, but one of the last times you’d looked down at him, one of his hands had come off you to palm himself through his pants.
Only then did you realize how long he was taking on just this, and you didn’t want him to think he had to.
“S-sunoo…” you called out, softly at first; he thought nothing of it, thinking you’d just said his name mindlessly.
So he ignored it and started doubling down on his efforts.
And when your legs started to shake around his head, he was sure he could get you over in a bit if he just kept this rhythm.
This time, you were a little louder as you slid your fingers through his hair.
You meant to push his head away, but he placed his hand over yours and buried his face in you more.
And now that you were getting close, you couldn’t help but press your hips into his face a little.
Though, it wasn’t until after you started coming off it that you realized you’d finished once just like this.
Not until you felt him cleaning you up as much as he could with his mouth.
Just who was this guy between your legs? Where was Sunoo?
“You taste…really good…” he says, moving up your body slowly.
The way he says it implies he expected it to taste differently or that he’s tasted differently, and you can’t be upset at that when he’s telling you that you’re better than what he’s had before—now you have to meet the standard you’re raising.
Now hovering above you, Sunoo has settled between your legs and is so close to pressing his hips into yours even with his clothes on for any kind of friction.
“I didn’t take you as the type to take his time with this part…” you say softly, a hand coming up to tug at his shirt.
“No? What did you think would happen?” He asked, teasing you lightly as he leaned to kiss your neck.
“I was hoping you’d be a little selfish…get into it right away…” you admitted, your voice a little shaky.
You can’t let him take over completely, not without a little fight.
So to make up for how affected you are, you move your hand lower, wanting to affect him the same way by touching him slowly through his jeans.
“You’re not what I expected either…can’t even wait a little to touch, can you?” He whispers, grabbing your wrist to stop you for a second.
“Come on…take your clothes off...” You whine, tugging at his shirt again.
He chuckles a little, removing his clothes with your help and eventually settling between your legs again.
You only saw it for a moment, now it’s pressing against your inner thigh, warm and hardening up more by the second.
“Here…help me put this on…” he says, leaning into his elbow as he hands you the condom.
This isn’t established, and he feels like he has to prove and show that you can trust him; if that means getting you to put this on him, he doesn’t care.
Now that you have a better reason to look and touch, you sit up slightly, just enough to see what you’re doing.
He’s much bigger than you expected him to be; long and with a slight curve upwards—and he’s clean, which you did expect.
And while you’re analyzing, Sunoo is grabbing fistfuls of the sheets beneath you; why you chose to roll it over his length this slowly is beyond him—you were eager just moments ago.
“L-lay back…” He stammered, trying to retain some sort of control over himself and the situation.
You smiled a little, how sweet was it that he never really demanded?
You aren’t going to overlook the fact that he might let you get away with more if you played with him just a little more.
For now, you let him continue to think he’s in charge and lean back until you’re lying on your back like he asked you to.
He sits back on his knees, hooking your legs over his arms as he pulls you down towards him.
“Are you still sure…?” He asks, looking up at you with a strained expression from how much he’s holding himself back to make sure.
Now that he has that, he shifts his hips up so the tip presses against you, then he pushes in; slowly and just enough to stretch you out but not fill you.
A soft whimper slips out of him, but it’s more embarrassing that he’s struggling to keep himself up when the feeling of how tight you are makes him want to collapse.
“Fuck…” you sigh softly above him, arching your back slightly and pushing your hips into his.
His hand finds your hip quickly, holding you down just for now.
“D-don’t move.” He says, giving another inch.
For a moment, he stays still with less than half of himself inside you.
“M’gonna move…okay?” He says softly, coming up just to meet you.
You nod, and he pulls out just a bit before pushing back in; it’s slow and he starts kissing your jaw as he moves.
Sunoo sinks deeper with each thrust until his hips are flush against yours, and then his hips roll into you with each thrust, the curve hits something inside you and he has you digging your nails into his shoulder to keep yourself from getting too loud.
“Look at me, please…” he begs softly, moving a little faster as he hooks your leg over his hip.
You pull him closer, looking up at Sunoo and trying your best to hold the eye contact is much harder than it should be, especially when he looks like that.
His hair is falling over his eyes if it isn’t sticking to his forehead; and every time he bottoms out, his jaw tightens with a soft groan.
Is it too bold for him to want to try and get you to finish again before he finally does?
Maybe he isn’t doing enough to meet that goal.
He can’t spare his hands, so his mouth will have to do; but he’s too shy to continue asking, so he tries leading up to it by kissing down your neck, leaving bites along the way, before he settles on your chest.
You get a little louder then; one of your hands slides up into his hair and you push him into your chest, wrapping your legs around his waist then as well.
Between his mouth on you and his thrusts, you start blanking out to focus on the feeling; he can’t remember what it was that he did exactly, but one thrust forward had you throwing your head back as you moaned his name.
He looked up at you as he pushed in that same spot with a bit more force, trying to find where it was that he hit before.
And when he found it, he knew he needed to stay with it.
“There?” He asks, feeling his own start to build up.
“Y-yeah—“ you cried out, fluttering around him.
Whatever energy he’d been saving before is spent hitting this spot over and over with each thrust hitting deeper than the last.
He isn’t sure how much longer he can hold out, but he doesn’t want to look at you if he finishes before you.
So for the last few pumps, he hides in your shoulder, swearing softly into your skin as he tries to hold out for as long as he can in hopes that you finish first.
You do it together without meaning to; at least, you think you do—sunoo let go the moment you tried to say you were coming.
Too confident in the thin barrier between you and him, sunoo buries himself inside you and spills into the condom.
You lay completely still, feeling him pulse inside you and stay even after he starts to soften.
And as your breathing starts to even out, and as you’re both coming off it, you realize how late it is and how you have an early shift tomorrow.
Why does that have to be the first thing you can think of after having such a good time with him?
“Sunoo…” you call out softly, you know he’s conscious because you can feel him rubbing circles into your hip, but why he hasn’t moved is beyond you.
“Mhm…?” He hums, staying in your shoulder.
“Are you staying?” You ask, looking up at the ceiling to ground yourself on something and not back out.
“If it’s okay…” he says, voice slightly muffled.
“Yeah…” you assure, “so…you wanna pull out?” You add, not wanting to admit that you need to go to sleep now if you want to wake up with enough energy tomorrow.
To your surprise, he shakes his head.
The truth is, he doesn’t want to leave; you’re warm and he likes how you feel.
But also, he’ll get hard again if he moves out too quickly.
“Just stay like this a little longer…please…” he says, tilting his head to look up at you to try and convince you to let him stay.
Aftercare wise there wasn’t a lot to do, especially since he’d used a condom that he just had to throw away.
But he did hold you the entire night and let you wear his shirt so you weren’t completely naked.
And when you woke up the following morning, he woke up with you, but stayed in bed after you told him to.
“You don’t have to leave now, you can go back to sleep and take a shower before you go.” You said.
Sunoo nodded, burying half of his face into the pillow you were using that was still warm.
“Talk to you later…?” He asked groggily, a little nervous about what this meant for your relationship now.
“Yeah…” you replied, turning away from him so he wouldn’t see you smiling like an idiot.
“Have a good day.” He called out softly, a small smile even as he kept his eyes closed to go back to sleep.
He looks good the morning after too; you almost contemplated staying, almost.
