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starryyyoichii

Mar 16, 2025

noosayog

002 get him back!

✧ wc: 4k

✧ warnings/content: miya osamu x fem!reader, sfw, fake dating au, angst to fluff,

✧ GUTS masterlist, regular masterlist

divider from @/cafekitsune

It all started when Miya Atsumu said that you would never be able to find anyone who could put up with you. And you would have taken that with a grain of salt, if Miya Atsumu wasn't your ex who also happened to be a thorough asshole.

“Well you dated me didn’t you?!”

“And we broke up, duh.” he says flippantly.

You clam up at that. You know he’s just saying things. He doesn’t mean it and he’s a complete moron. But it’s been almost a year since the break-up and not a single man has even offered to buy you a drink. Are you going to have to resort to making a Hinge profile?

–

“I don’t know why ya let him get to ya. He’s just a moron,” Osamu says.

“You have to say that, he’s your brother,” you grumble.

“True. But he is an idiot.”

You plop your face heavily into the elbow resting on the counter and blow raspberries in one big exhale.

“Don’t get yer spit all over where my customers eat.”

You grunt, turning over to watch Osamu work behind the counter.

“Do you think I’m unlovable?” you ask.

“Huh?”

“There must be a reason no one’s asked me out on a date in the past 8 months, right?”

Osamu sighs, dropping off a plate of food in front of you. “I’m not gonna answer that.” Then he turns with his back facing you to fiddle with something on the other side of the kitchen.

“Why not?”

He exhales through his nose, quiet, but you hear it.

He doesn’t get the chance to answer because the door swings open to reveal Osamu’s twin. You jolt up, fixing your posture, self-conscious about letting Atsumu think his words are getting to you.

And rightfully so because Atsumu acts like a shark that smells blood. His lips curl up into what he thinks is a smirk, but resembles much more of a snarl.

“What’s up with ya,” he asks oh-so-innocently.

You have no good response and feel your face heating up in embarrassment when Osamu swoops in.

“Are ya gonna sit down or just block my door? ‘Cause I got people that actually pay to eat here.”

Atsumu starts yelling something at Osamu but simmers down into the seat next to you and mumbles something to himself, no doubt some choice words for his brother. It gives you momentary reprieve from Atsumu’s provocation which is the last thing you need right now with your self-esteem in the dumps.

The break is temporary though, because like a true creature with short-term memory and a propensity for being a prick, Atsumu circles back to the topic when he’s done eating.

“So, found a guy to take you out?”

“What makes you think I’d answer that question,” you bite back. Weak, but it’s all you have.

“Hah,” he scoffs. “I knew it. Ya can’t find anyone.”

You feel the irritation boiling like a witch’s cauldron inside of you, brewing a mix of resentment, mortification, and the tiniest streak of competitiveness. Atsumu not shutting up for the rest of the night is the final ingredient that makes your red hot concoction boil over. It goes a bit like this:

“Tell me if ya want me to set ya up with someone from the team. Might be the only chance ya get at this rate,” he teases.

“No thanks,” you hiss. “I’ll have you know that I’m dating Osamu, widely known as the better Miya.” You point smugly at Osamu whose back is currently to you both.

“What!” Atsumu yells. “Osamu? And you?”

With Osamu’s back to you, you can’t see his face, but all your fingers and toes are crossed that he’ll play along so that you don’t burn up in a gas of complete humiliation.

When Osamu turns around, his eyes go to you first. They search yours for something – what, you don’t know. He apparently finds it because he blinks away and tells his brother to mind his own business, neither denying nor validating your claim.

It might as well be confirmation though, because Atsumu squawks in indignation, sputtering his disbelief. Osamu continues to bicker with his brother, keeping him occupied enough to not realize that he was slowly being backed out of the restaurant.

When Osamu slams the door on Atsumu and twists the lock in a dramaticized show of finality, Atsumu finally gives up, yelling a muffled “I’ll be back.” through the windows. You could laugh at the duo if Osamu didn’t turn around and fix you with a look, similar to that of a responsible older brother scolding a child.

“Now yer turn. What was that about?”

“Osamu! You heard the way he was talking to me. I just can’t stand it!”

“Have ya thought this through? How’s this supposed to end, huh? We break up and Atsumu goes back to making fun of ya?”

You open your mouth to beg, because it’s always worked with Osamu. He always gives in. But he’s not done, apparently.

“‘Least ya could’ve done is ask me out, not use me to get through yer petty grudge with ‘Tsumu.”

That shuts you up. When you look at Osamu, he’s not looking at you. His eyes are downcast, distracting himself by wiping up the counter. It’s so brief that you convince yourself that you imagined the hurt in his voice.

“‘Samu…”

“Forget it. I’ll do it, but ya better have it thought out because I’m not helping ya anymore than this.”

It should be a win and any other time, you would wrap him up in a bear hug and shower him with thanks, but the defeated way Osamu concedes makes you solemnly finish your meal. It feels unfitting to say thank you.

–

Your first stint as Osamu’s girlfriend comes in the form of a friend’s dinner party. Since the night you forced Osamu to be your boyfriend, you have been back at Onigiri Miya to hang out, but have painfully tiptoed around the topic. The thought has occurred to you that you and Osamu should agree upon a backstory, but you haven’t had the courage to breach the topic after the way Osamu reacted.

He had just nodded when you asked him to attend this dinner party with you. And with that, he had dutifully picked you up at your apartment, perfectly on time. You had expected a stone-faced Osamu all night, but he had surprised you with a sweet smile, one that you’re used to being on the receiving end of. But it somehow feels different tonight. Maybe it’s the fact that he’s supposed to be smiling at you as your lover tonight. It was easy, the way he had held out his arm for you, no awkwardness in sight.

At dinner, Osamu makes no move to let go of your hand, going as far as to intertwine your fingers under the table. When any one asks how the two of you began dating, he squeezes to tell you he’ll handle this. You’re grateful and you feel undeservingly spoiled as you watch him. He looks around the room, drifts his gaze back to you where his lips flicker upwards for the tiniest second, then looks back at the crowd to flash a mysterious, close-lipped smile. You can barely hear the dinner table go wild with jeers and Atsumu squawking as you gawk at Osamu’s act.

And it goes on.

As you eat, he keeps your fingers clasped between his, laid on his lap. Atsumu gives you two the stink-eye, questioning why Osamu was eating with his left hand. You’re pretty sure your eyes are bulging out of your head at this point, because Osamu flushes. Osamu is blushing as he reluctantly lets go of your hand, making a show out of placing your hand back on your own lap and mumbling a heavily-accented apology at no one in particular.

–

When dinner finally ends, the party migrates to the living room. Osamu doesn’t need to ask, perfectly picking your favorite after-dinner drink of choice as he chooses a beer for himself. He has once again claimed your hand in his. His grip is tight and when you try to slip your hand out to get some space, he holds tighter.

You lean up to whisper in his ear, “Osamu, my hands are sweaty.”

He leans down to hear you better, but stands back up when he registers your comment. He ignores you, only squeezing twice, as if telling you to behave for him. Your head spins; you’ve never dated like this before.

Being with Atsumu was like living in a comically unrealistic sit-com, like you were constantly finding yourself in situations and having conversations that belong in a Tom and Jerry episode. He argued with you about everything, had an ego, and a temper. A particularly memorable moment was when he was still courting you, trying to convince you to date him by saying, “I’m six foot two.”

“Dude, nice try,” you had said.

But somehow, right now, with Osamu standing by your side and towering over you, you think that if this younger twin used that line on you right now, you’d fold in half for him. As if you wouldn’t with all the sweet nothings he’s lavished on you in this one night.

He only lets you get away when you embarrassingly whisper to him that you need a bathroom break.

“I’ll walk with ya.”

“No!” you exclaim. You lower your voice when he stares at you. “It’s okay, ‘Samu. I’ll be right back, okay?”

He backs off and you finally get away from his orbit.

Finally alone, you barely pull yourself together. You stare at your reflection in the mirror, slapping your cheeks lightly to pry the strange daze from your eyes. You can’t get carried away here. Osamu is doing you a favor, one he isn’t fond of. You can’t get used to Osamu treating you like this. It’s borrowed time.

You splash water onto your face, waiting until the chill seeps into your cheeks that have been painfully hot since Osamu picked you up tonight.

As you exit the bathroom, Atsumu is there waiting for you in the hallway.

“I’m onto ya,” he starts.

You scoff, immediately putting your facade back on. It’s easy with Atsumu. “Oh please, Atsumu. You’re just jealous.”

It doesn't phase Atsumu the way you hope. “Such a weak comeback. Sounds like something you’d say to disguise the fact that yer playin’ my brother.” Your brother is the one playing me.

“Whatever, Atsumu,” you say, walking away, taking Osamu’s advice to not let Atsumu get to you.

“I bet ya forced my brother to pretend to be yer boyfriend. I know my brother and I know you. Just admit it.” He smirks. “It’s okay that no one wants to date ya. Nothin’ to be ashamed of.”

The fact that even Atsumu, even all of his stupidity, sees right through you makes you feel hot. You’re grateful that you’ve already turned away from him because you could not take much more damage tonight. Nothing would end you in a worse way than Atsumu seeing that he could make you cry.

Or maybe it’s the fact that Atsumu doesn’t, for one second, believe that someone like his brother could fall for someone like you. Maybe no one does. Maybe everyone here just thinks that you’re making this up and they’re playing along to help you save face.

It takes everything in you to keep your steps and breathing even as you take the walk back to Osamu to compose yourself.

It’s useless apparently because Osamu seems right through you. He immediately offers to take you to the balcony, explaining to everyone that you need some fresh air to cut through the alcohol you’ve had.

His silent understanding makes it worse because it makes it clear that you’re an open book. The act you put on is completely pointless because no one believes you anyway.

Osamu guides you to the balcony and shuts the door behind him, leaving the two of you alone.

He joins you at the railing, draping his jacket over you. You know he knows that you want to avoid looking into his eyes, just as much as he knows you want to avoid having this conversation altogether. He sighs.

“Why do ya let him get to you like that?”

You look back at him, eyes widening at the tone he rarely takes with you. His eyes are fixed forward, arms still dutifully wrapped around you, ever the dedicated boyfriend. But as his gaze flickers to you momentarily, you catch the weight of his question in his eyes.

“Who?” you mumble.

But Osamu’s not in the mood. He stays silent, letting the question hang in the air.

“I don’t know… I just…”

“Are ya still in love with my brother?”

“No,” you answer honestly.

Osamu raises his brows.

“No, but I’ve known him for so long now.” You feel the need to explain. “He just gets under my skin. You of all people should understand – he’s your brother! You guys fight all day long.”

“He’s my brother. We shared a womb. We were born to fight.” Osamu sighs. “You, though... Why can’t ya just let it go?”

“I don’t know! I just…” you trail off.

He continues to stare at you, not even knowing the effect he has on you. His earnest gaze pulls the truth out from under your skin.

“I wanna get him back,” you admit.

Osamu’s eyes go dark at that statement. His expression shutters.

“Not like that!” you quickly amend. “Not like I want to get back with him, I mean like, his face just pisses me off!”

“Huh?”

“I just wanna punch him in the face but I don’t think anything would give me more satisfaction than proving him wrong you know. And honestly, Osamu, you-”

“Ya think that I’m the perfect person to piss him off for ya. ‘Cause I’m his brother and there’s no one else who would get under his skin more than if I replaced him.”

You hear the disappointment heavy in his intonation.

“Osamu…”

“Am I wrong?”

He’s not wrong, but you feel an urge to tell him how he made you tingle at dinner. It was in the way he catered to your whims, covered for you, and held your hand in secret. It was in the way he, as your not-boyfriend, made you feel loved and desired much more so than any other boyfriend you’ve ever had before.

But when you look at his side profile, face now turned away from you and hidden by the shadows of the night, it doesn’t feel right to say any of that. Even in your mind, it sounds like an excuse. Because the bottom line is that he’s right. Your original intentions had been to use Osamu. And the fact that you might have developed a slight crush on him in the process doesn’t make you feel any less shitty and certainly doesn’t make Osamu feel any less used.

His question goes unanswered.

–

The rest of the week goes by uneventfully. Actually, it goes by too uneventfully because Osamu doesn’t call or text once. Not that you’ve made an effort, but after how that last conversation with Osamu ended, you can’t find the courage to face Osamu.

It doesn’t make you miss him any less.

You can’t recall if you used to miss Osamu like this, think about him and wish he’d reach out even if it’s only been a couple of days since you’ve last met. You only know that right now, you wish he’d make the first move because you can’t muster up the nerve to see him, even if it’s all you wanted. It also makes you realize that Osamu has been spoiling you long before that night and long before he agreed to be your fake boyfriend. The reason you never had to miss him is because he is always the one who makes the effort to call, text, bring you lunch, pick you up from work, drive you around.

The realization only made you feel worse about yourself.

And after days of mulling over realization after realization, each making you guiltier and guiltier, you made your decision.

That’s how you end up running to Osamu’s apartment, late on a Thursday evening. Without pausing to compose yourself, afraid you’ll lose your momentum, you knock.

The door swings open to reveal a very tired-looking, very handsome Osamu. He has his cap off, but his hair is unruly, as if his fingers have just recently run through it. His eyes are slightly bloodshot and his t-shirt is wrinkled. The urge to rub your thumb over his eyelids and smooth your other hand over this shirt is a sudden one you shove down because Osamu’s opening his mouth.

“Hey, what’cha doing here so late?”

There’s a momentary disappointment that strikes your gut. He asks you so normally, as if he isn’t plagued with thoughts of avoiding you. As if the couple of days that have gone by without any interaction between the two of you isn’t even a thought that occupies headspace.

“Uh,” you stutter.

“Actually,” he sighs and glances behind him. “Now’s not a good time. Can ya-”

“I don’t care about Atsumu,” you cut him off. It sounds like he’s preparing a rejection. Or he just doesn’t want to talk. Neither of which are favorable outcomes, so you barrel through to say what you need to say.

“I don’t care about what he thinks. Not anymore and definitely not that night. I was actually thinking about you the entire time and Atsumu, well, he’s just-”

“Just wait a minute, okay-”

“He just gets under my nerves because of the shit he says and I know he’s just saying stuff to rile me up and I’m a hothead, okay? He gets me because we’re like the same person sometimes, but I’m not doing this to get back at him anymore. It’s actually your fault because-”

“I knew it!” a voice yells from behind Osamu.

You crane your neck to see around Osamu and curse Osamu’s big frame for taking up the entire doorway and blocking your view of the apartment because there is the older twin, grinning widely and walking up to where you’re both standing.

You instantly feel the panic rise in your system.

“Atsumu,” Osamu begins in a warning tone.

Ignoring his brother, Atsumu continues on. “I knew it. I knew the two of ya couldn’t be dating just like that.”

Your nervous system goes into overdrive. Even you know how this looks.

You barged into Osamu’s place randomly at night and picked the time when Atsumu coincidentally is here as well.

Your wide eyes meet Osamu, willing him to believe that you didn’t come to make a scene for Atsumu’s viewing. You didn’t come to confess that you might have a crush on him with this exact timing so that Atsumu would fall for the act.

When Osamu refuses to meet your eyes, it brings your attention back to Atsumu, who continues to gloat about his victory.

Your face burns in mortification as you take slow steps away from the twins, making room for your getaway. As Atsumu gets closer and Osamu continues to avoid your gaze, your courage wanes and the last bit of pride you’re holding onto propels you to turn away instead of retorting as you always do.

“Aww, really let my words get to ya, didn’t ya? I knew all along-”

Before you can start running, Osamu grabs your arm and pulls you into the apartment, the other arm shoving Atsumu out.

“Hey, ‘Samu!”

“Shut the fuck up, ‘Tsumu. Now that my girlfriend’s here to spend the night, get out.” Osamu shuts the door in his face.

Atsumu’s protests fall on deaf ears, the sound of Osamu referring to you as his girlfriend echoing in your mind. He had taken your side, chosen to take the course of action that would embarrass you to least despite not having confirmed what your intentions were. The thought fills you with hope.

He pulls you further into the apartment, sitting you on the barstool. After situating you on the chair, he makes to step out of your personal space, but you lean forward, wrapping your arms around his neck to keep him close. Your eyes start to sting in frustration that Osamu could somehow believe that this was all just another incident you had orchestrated to get back at his brother. This has all gotten so hopelessly messy.

“Osamu,” you sniffle into his neck. “I didn’t come over here and say all that because I knew Atsumu was listening. I just-” missed you.

He rubs soothing circles into your back, gently enough to make you want to cry more because you don’t deserve this but want it so badly.

“You just…?” he prompts.

The words won’t come out and your tears soak into his shirt. You want to tell him so badly that you’re not crying to garner his sympathy; you’re crying because you’re so angry with yourself.

Osamu patiently strokes your back, letting you cry before quietly telling you, “Oh, baby. How long do ya think we’ve known each other? I know yer not the type to set up this whole complicated scenario just to show up my stupid brother. I believe ya.”

His other arm is now holding your head to his neck, fingers running lightly across your scalp. “So can ya finish what you were about to say for me?”

His words and his actions do what they always do to you. They fill you with so much hope that there’s no room to mistaken his intentions. They fill you with the courage to tell him.

“Missed you,” you whisper.

Finally, both of his arms wrap around your back to push you tight into his chest. He squeezes, gentle enough to keep you safe but firm enough to tell you he wants you there. It pulls the confession out of you.

“And I like you so much, Osamu.”

He chuckles lightly into your ear. You can feel the vibrations echo in his chest. When you squeeze back, he trails his arms down to your legs to guide them around his waist. He carries you with ease to the couch and sits you down to cry in his lap.

You don’t know how long the two of you sit like that for, but when you finally calm down, you keep your arms wrapped around him and quietly ask, “why did you do all this for someone like me?”

He stops stroking your hair.

“What, ya don’t like it?”

You pull away to protest, already too comfortable with him spoiling you again, only to find the corner of his lips quirked up in a smirk.

He’s teasing, you realize.

You smack his face weakly and wind your arms back around him.

You snuggle back into his neck but he’s the one who pulls you back this time.

“Hey, seriously though,” he says. “Is this okay?”

You nod shyly.

“I need to hear it, sweetheart.”

“I want it.”

“Alright. C’mere then.”

You oblige.

“Can I tell ya a secret?” he murmurs into your neck.

You nod.

“There isn’t a man out there who’d do all that for someone he doesn’t love, ya know that?”

It makes you flustered, but much of what Osamu does does that to you. His tenderness makes you want to try harder to meet him in the middle.

“Can I do something?” you ask, taking a leap. Your face is incredibly hot and your heart is beating embarrassingly loudly against his. “Is it okay if I kiss you?”

It’s easy when he responds, “You can do anything ya want to me.”

You intend for it to be an innocent peck, your form of an apology. But he holds the back of your neck, the other arm wrapped almost all the way around your torso and doesn’t let go until you’re panting against his open mouth.

He’s nonchalant when he shrugs.

“You can do anything ya want but I’ll be doing the same from now on.”

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