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teamatsumu · 3 months

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primal. (miya osamu x reader)

word count: 2586

warnings: a/b/o dynamics, fem!omega reader, porn with minimal plot, swearing, typical omegaverse jargon (scent, heat, rut, slick, knot)

tags: @keiva1000 @kindnessspreads @msbyomimi @sleepyxxhead @priv-rose

This was getting ridiculous.

Three whole days Osamu had not spoken to you. And for what? Because of a stupid argument you had about his new menu? In your mind, if he didn't want constructive criticism, he really should not have asked you for your opinion.

(You tried to ignore the gnawing guilt you felt that maybe you had been too harsh.)

But still, was it worth being this upset about? He hadn't replied to any of your messages. His phone was going straight to voicemail, and to top it off, even Atsumu hadn't heard from him. The blond twin had told you to just give him some space, and that he was ‘going through it’. But you scoffed. What exactly was he going through? All this over a controversial menu item? You didn't know Osamu could be so unreasonable over something so stupid.

Which is why you were standing at his door now, knocking for the last ten fucking minutes, while he didn't even bother to respond or open up. Your knocking had now progressed to vicious pounding, and you didn't give a shit if the neighbours heard. You were pissed. Osamu was being a baby and not communicating with you and you would make him talk if it was the last thing you did.

“Open this fucking door, Osamu!” You shouted for the tenth time.

“Go away!” Finally. Now that Osamu had gotten tired of your incessant pounding, he had finally responded. Triumph coarsed through you.

“I knew you were in there!” One more smack on the wood. “Open up. Now!”

“I'm tellin’ ya to go away.” His voice sounded strained. Your eyebrows furrowed a bit.

“What's up with you?”

There was some shuffling, and then a pained groan. Your muscles stiffened in alarm.

“Samu?” You could feel your anger drain away, replaced by worry. “Are you okay? Open the door!”

“Just go away. Everythin’ is fine. I'm not mad at ya. I just need ya to…. get away.”

You couldn't ignore the pain in his voice anymore. You tried the doorknob again to no avail. “Please let me in. I'm getting worried.”

Silence again. You leaned against the door, your panic only building. “Samu, please.”

Your anger was non-existent now. It didn't matter to you whatever stupid fight you two had gotten into. Your paranoid mind was racing and all you could think about was a million different ways that Osamu might be hurt. If anything happened to him…

Your heart imperceptibly broke.

You had known Osamu since high school, when him and his brother would melt your brain with their unnecessary fighting and competition. He was young and naive then, with that godawful gray hair that he thankfully abandoned after high school, and an attitude so fiery it left most other people in the dust. You couldn't understand why you were so attracted to him at first glance, but then he presented as an Alpha mere months after you first met, and your attraction to him became quite clear.

More than anything else, Osamu was your close friend. He understood you in a way his twin didn't, and you liked to think you were a good friend to him too. You kept your feelings for him pretty tightly wrapped up in your heart, afraid that an Alpha like him wouldn't want you. He was desired widely by many, many omegas. And he had always turned them down. If all those prime omegas weren't good enough for him, you didn't stand a chance.

So you lived with him as your friend, because you would rather have that than nothing at all.

You knocked on the door again, more softly this time, knowing he was right on the other side. “Samu, please let me in. Let me see.”

There was a thunk. You assumed Osamu had leaned his forehead against the door. “Omega…”

It clicked in you, like gears fitting into place. Your heart raced. You shuffled closer to the door until there was no more space left. You sniffed carefully.

There was his scent, heady and musky, sandalwood and something you had come to associate only with Osamu. A scent you had loved for so long it made you want to buckle to your knees. It was strong, heavier than any time you had smelled it before. It made your eyes cross, your breath pause. Something in your core stirred.

“Your rut?” You mumbled. You knew he heard you.

Osamu groaned low in response. Your thighs clenched.

Over the years, you observed that Osamu's ruts were rare. Maybe once every three months. He would always disappear a few days beforehand, and didn't reappear until it was well over and done. Atsumu said that since his ruts were so spaced out, they would always hit really hard. So you tended to leave him alone until he reached out first, talking normally and as if nothing had happened, picking up where he left off.

In your anger and with your fight fresh in your mind, you didn't realize that Osamu had likely gone off the grid because of his rut, and not because he was ignoring you. Now you were standing here, mere inches from an Alpha in full rut, with your own core tightening and something wet slowly dripping down the crease of your thigh. Your inhibition was slowly dissipating the more you frantically tried to breathe his faint scent. Your omega purred and whined.

“I could help.” You dared say. “I could help you, Alpha.”

Another groan, low and desperate, and you felt like it was rattling through your very soul. You bit your lip hard, hand twitching to move between your thighs, but you remained frozen. Osamu didn't move away from the door. His pants grew louder, and then he whined.

“Are you sure?” His muffled voice came, almost broken with desire. He wanted- needed- you to say yes. You nodded vigorously even if he couldn't see you.

“Yes!”

Some thudding, clicking, and then he pulled open the door. Your breath caught at the sight of him.

He was gloriously shirtless, and his loose sweatpants were doing nothing to hide his problem either. His erection was obvious, straining and standing against the struggling material of his pants. It would look almost comical if you weren't horny out of your fucking mind right now. His bare torso shone with a thin layer of sweat. You bit your lip so hard you were sure you drew blood.

“Holy fuck, you smell good.” Osamu's nose, more sensitive with his rut, twitched. His eyelids fluttered, and he took in a deep breath. You stared at him some more, wondering if you were dreaming.

“What are ya standin’ there for? C’mere, Omega.”

He tugged on your arm, until your body was making contact with his. Your hands rested on his chest, and you could feel how rapidly his heart was beating. He leaned down until his face was mere inches from yours. His breath hit your lips, made them tingle. Your core clenched painfully. His scent got stronger.

“Ya sure ya want this?”

You didn’t even have the strength to nod, feeling lightheaded. You only tilted your face up until your lips brushed his. “Please.”

A breathy curse, and then he was kissing you. His arms wrapped tight around your back, like he was scared you would disappear, one hand gripping possessively over your hip. You suspected it would leave a bruise.

You wanted it to leave a bruise.

He left you breathless when your lips parted. He tugged you in further and shut the door with a loud bang, before pushing you back against it. The manhandling turned you on to no end, the thought that you were someone Osamu was about to use to satisfy himself. Your already aroused mind went wild at the notion and you arched into him when he crowded you against the door, lips meeting in a frenzy. He bit and licked your mouth raw, invading your mouth like he couldn’t bear to be apart from you. You dug your nails into his biceps, reveling in the feeling of him, of finally having him the way you wanted. Your panties were soaked through by now. Your inner thighs held the signs of your desire.

His lips traveled down your neck next, licking and biting, inhaling and exhaling as he scented you. His cock pressed into your hip and you let him satisfy his need to leave his mark on you, basking in his scent that mixed with yours and how he laid his claim on you, albeit temporarily. His hands gripped hard at your sides, pushing your shirt up to run over bare skin.

“Wanted this so bad.” He rasped, biting dangerously close to your scent gland, you leaned into the sting. “Every rut. Ya know how many times I’ve jerked off to ya?”

His accent was thick, his words slurred. You were sure he was completely gone by this point. You gripped his hair hard.

“Wanted you too, Alpha.” You whimpered back. “Touch me, god, please.”

Osamu lifted you up then, two strong hands grabbing your asscheeks and carrying you across the room to where his couch was located. You wrapped your arms around his neck, taking the opportunity to lap and nip at his neck, scenting him back. Your drenched walls fluttered around nothing, crying and weeping for a nice, thick knot to fill you up.

You had a suspicion you wouldn’t have to wait long.

When Osamu dropped you on the couch, his hands immediately tugged on your clothes, pulling off your jeans and panties in one go. The fabric clung to you with how wet it was, and the air was cool on your burning skin. You used the moment to pull off your top until you were bare before him. Osamu kissed your calf, traveling up quickly with a few kisses laid on your skin. Your thigh, your stomach, the valley of your breasts, your jaw. He had tugged his sweats down already, and you felt something hard poke at your dripping entrance.

“Can’t wait, baby.” His voice trembled. “Need ya now. Need to knot ya so bad I’m gonna explode.”

And then he was sliding into your slicked up but unprepped pussy, carving his way through your spasming walls until a sharp pain went through you. You gasped at the glorious stretch, at your walls recognising an Alpha cock and opening up to accommodate him. Your wetness ran down your ass, likely soiling Osamu’s couch but you doubted he cared. He was cursing and whining in your ear, spine bending forward at the relief of finally sinking into a wet, ready cunt. His face was flushed a deep red, sweat building on his forehead. He sank into you to the base, your toes tingling with the sensation of being so full.

“Hold on, omega.” His last words. They almost sounded like a threat. Your breath caught.

Then he was gripping your hips and holding you down, before fucking into you hard and fast. You gasped at the sudden pace, legs pushed even further open as his cock repeatedly bullied itself into you. Your jaw went slack at the sensation, how he hit you so deep, sloppy noises filling the air along with your cries and his moans. His skin slapped hard against yours, leaving the inside of your thighs red and tender. His cock hit every spot just right. You felt your toes curl.

Osamu watched your reactions, nearly delirious himself, barely holding on by a thread.

“Feel good?”

You nodded frantically, fingernails scratching over his shoulders and arms. Osamu leaned down on his elbows, tongue poking out to lick at your lips every now and then.

“Tell me how good it feels. Tell me.”

“I-” You gasped and jolted with the force of his thrusts. Tears built up in your eyes and spilled down the sides of your face. “Can’t- can’t talk.”

“Yes you can.” His hand wound into the hair at the back of your head, tugging hard until you arched into him. “Say it. Say ya love my cock.”

“Love your cock.” You managed to wail, clamping down hard on him. He cursed and leaned down further, pace not even faltering in the slightest. His lips sealed themselves against the skin of your neck and he sucked hard.

“Tell me how bad ya want my knot.”

“Want it so bad.” You parroted, losing every coherent thought and just going along with what he was saying. Osamu continued to pound into you like he wasn’t even talking, like he wasn’t rearranging your guts or turning your legs to jelly. Like the base of his cock wasn’t rapidly swelling and catching on the rim of your hole.

Osamu pushed himself deep into you before stilling completely, and you nearly weeped in frustration.

“Tell me why ya deserve my knot.” He gritted, eyes meeting yours. Little golden flecks shown in his irises, and his incisors elongated below his bottom lip. He was deep, deep in the clutches of his rut. Combined with his messed up hair and flushed cheeks, he looked wild. Uninhibited. Dangerous. Your pleasure hit its very peak, teetering just over the edge, begging for that last push. You sobbed.

“Wanted you for so long.” You gasped and cried, tears pouring from your cheeks. “Wanted you to fuck me and knot me and give me your cum. Please, Alpha, please. I’ll be so good for you.”

Osamu groaned. Something in his eyes softened. He hooked a hand under your left knee and tugged it up, folding it against your torso. His cock pulled out before pushing back in, slowly picking up his pace again. You moaned loud, feeling your pit tighten up again.

“Why don’t ya cum fer me nice and hard, baby? Get me wet with your juice and then I’ll fill you up. Promise. I’ll shove this fat knot into your tiny little cunt. Just cum fer me, little omega.”

And you did. You arched into him, eyes rolling and arms seizing as you came harder than you ever had in your life. Electricity zipped through you and all air was punched out of your lungs until you felt that your very soul was leaving your body. You didn’t even register when Osamu groaned and stuttered in his pace, or when his knot swelled until it was bullied into your thoroughly fucked out and sore pussy. White hot cum filled your insides as he locked into you, hips flush against your own.

Strong arms wrapped around your waist as Osamu’s comforting weight settled on you. He licked and lapped at your neck softly, breathing into you until you were nothing but his scent, his touches, his marks. You panted and tried to catch your breath, legs trembling with aftershocks of the event. You could barely lift your arms to run over his bare back, but you managed. Osamu hummed at your soft touch.

All was silent beneath you two as the fog of his rut lifted. You could feel him slowly cool down, get pliant against you. You could almost sense his apprehension.

“Do ya regret it?”

You smiled slightly, staring up at the ceiling. “I meant it, Samu. I’ve wanted you for so long.”

You could feel his own smile against your neck, his embrace around you tightening. “Me too.”

Your skin buzzed with warmth. While Osamu breathed softly against your neck, you let yourself drift into a quiet sleep.

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