Archive of Our Own ^beta

This isn’t something they’ve talked about.

And why would they have when they aren’t together? This is just something they do to satisfy their instincts, a biological need hardwired into them. It’s to break the tension. To keep them from wholly devouring each other in ways beyond what Ego taught them while they were still teenagers in Blue Lock.

He has heard Isagi mention it before, not to him directly but when they’re in groups, out for drinks for a small Blue Lock reunion that he’s been dragged to, or during some bullshit team-building exercise for when the national team gets together. Isagi will talk about it with a slightly dreamy look in his eyes, how one day he’d like to have a mate and some pups of his own.

It’s normal for omegas to want that, even the ones who are top athletes, Rin’s learned over the years. Times have changed and having pups is no longer a death sentence to an omega’s career. They don’t have to retire early or face discrimination for taking some time off to have children. Rin would know best, especially when his own brother has talked about going through just that.

His issue isn’t that Isagi want pups, it’s that he talks about it as if Rin has never even crossed his mind, that he’s not an option despite them having been fucking long enough for their heat and rut cycles to have synced up.

That thought alone is enough to piss him off, instantly switching up his mood until a low growl slips past his lips.

“Rin!” Isagi cries out from underneath him, drawing Rin back to the present moment where his movements have unconsciously become ruthless, thrusting into Isagi hard enough to leave bruises on the backs of his thighs that’ll last for days.

Rin’s pheromones have spiked around them, his irritation clouding the air and leaving behind a slightly acrid tinge. Isagi only keens, arching his back off the bed and fisting the sheets above his head with one hand. His other hand grasps Rin, fingernails digging into his back and stinging in the best way.

They’ve been doing this for months now, ever since they’d met each other across the field for the hundredth time during a Champions League game. It ended like it always did with their adrenaline high and rivalry still burning between them like a raging wildfire. Only this time it couldn’t be contained until one thing led to another and Rin had Isagi bent over the desk in some hotel room.

Whether they like it or not, the warped relationship that had them clashing on the field translated into a highly compatible chemistry in the bedroom. A one-time thing turned into two times and then three until they realized there are only so many times they can call it an accident when the act of fucking someone is actually very deliberate. Rin swears Isagi was the one to suggest their current arrangement, a friends-with-benefits type of relationship where they hit each other up just for sex or to deal with their rut or heat.

Here they are now, Isagi pinned below Rin on the bed in his apartment, a scene so common that Isagi’s citrusy pheromones are now a staple in his home along with the extra toothbrush in his bathroom. The thought sends another wave of anger through Rin that makes him fist a hand in Isagi’s hair and yank it to the side, exposing his neck. He doesn’t hesitate to sink his teeth in, not quite in the right position to land a claiming mark like he wants to but close enough for it to be a threat.

Because Isagi’s fucking toothbrush is in his bathroom.

And yet the omega has the fucking nerve to be considering other alphas besides him.

“Fuck! Nnhg, please, Rin! More!” Isagi begs, which only serves to spur Rin on more, his mind spiraling down a dark possessive path.

This is all they are, all they’ve ever barely talked about but Rin doesn’t give a shit. Isagi’s been nothing but an asshole since the moment they met, an annoying little prick hiding behind the sweet innocence his omega designation gives him in the eyes of society. He’s constantly nipping at Rin’s heels, desperate to stick to him like shit on the bottom of his shoe that he can't scrape off.

It's because Isagi is the only one keeping up with him, the only one keeping Rin on his toes and worthy of being his rival that he has to be Rin’s. He never gave a second thought to things like mates but the moment he first heard Isagi speak of it, it was so obvious. Of course, Isagi belongs to Rin. Who else would ever stand by his side?

They’ve been described over the years as ultimate rivals when playing against each other yet each other’s ideal partner when on the same team. Rin has chilled out some since he was a teenager so he can at least admit to himself that he wants Isagi. There’s nothing sweet or innocent about his want though. It’s a feeling that consumes him wholly, more than his desire for revenge or to become the best striker, and more than life or death.

Isagi lets out another high-pitched moan and Rin can tell from just that sweet little cry how close he is. He clenches around Rin, body begging for a knot that Rin can’t give him when he’s not in the midst of his rut.

“You wanna cum?” Rin asks, sliding his hands down to Isagi’s waist where they fit against his curves like they were created just to hold him. He uses this new grip to yank Isagi toward him, matching pace with every harsh thrust that buries him in Isagi’s tight heat knowing it’ll spur him on.

“Yes, please– I-I can’t take it anymore,” Isagi pleads, eyes shut tightly and shaking his head from side to side as if he were on the verge of insanity. He gets like this every time, desperate and so docile that he’d do anything Rin commands. It’s a shame that Isagi thinks he could get this anywhere else, that some other alpha could satisfy him the way Rin does. “Please, Rin… let me cum, haa– please, please!!”

He begs for Rin so shamelessly and yet has the gall to look elsewhere when his eyes should only ever be on him. Rin could almost laugh at the notion if it didn’t infuriate him. If his stupid omega thinks Rin will ever let that happen then he’ll just have to remind him of his place.

“Go ahead,” Rin says, voice gruff as he grants him permission. He fucks Isagi through his orgasm, watching his mouth open to let out a pathetic whimper as he cums over his own stomach. A light sheen of sweat clings to Isagi’s skin that's flushed red and his chest is covered in marks that Rin sucked and bit onto him earlier. Isagi’s pretty blue eyes, shiny with tears, meet his as he comes down from his high, and a surge of pride wells up in Rin at being the one to make a mess of Isagi like this.

Rin isn’t oblivious, he knows that the boy who once used to complain about his lack of gift chocolates on Valentine’s Day is now one of the most coveted omegas ever since his soccer career took off. He’s too friendly for Rin’s tastes, always getting invited to go out by other alphas, especially those leeches from Blue Lock that can’t take a hint even when Rin tags along as a warning to back off.

It’s not only other people he has a problem with but also Isagi himself. He doesn’t trust Isagi to make the right choice when Rin’s been abandoned before. The last thing he'll allow is for Isagi to toss him away for some other worthless alpha who will never compare to him. He refuses to let Isagi think for a moment that he doesn’t need Rin. Because he does. He has to.

Rin cums a few moments later with a growl between his gritted teeth but he’s not satisfied. Not when Isagi’s taking birth control. Not when they're doing this outside of Isagi’s heat. Not when Rin’s rut is still weeks away and he can’t form a knot to secure him into place. When the chance for them to conceive is slim to none.

They haven’t talked about it but Rin’s made his decision. If Isagi wants to be bred so badly, Rin will be the one to do it and keep him by his side forever.

*****

A week later they find themselves in a similar position.

Rin lies awake in Isagi’s bed, sitting up with one arm behind his head that’s propped up on the headboard. Isagi is sound asleep next to him, curled up on his side with the blanket pulled up to his chin. It’s late but the moonlight shining through the window makes it easier for him to see Isagi’s features– the soft curl of his eyelashes, the curve over the apple of his cheek, and the gentle rise and fall of his chest as he breathes.

Most of their clothes are scattered around the room from the rushed way they’d fallen into bed but Rin can easily pick out the shirts and hoodies that have accumulated here over time. Isagi had stolen each article and carefully interweaved them into the nest that now makes up the bed they lay on. His omega nest, which is built on an instinct that Rin will never understand, provides him with safety and comfort during his most vulnerable moments. Sacred enough to him that Rin needed permission to enter it the first time and that Rin is the only alpha who has been allowed in it. The only alpha whose clothes make up the border and whose scent intermingles with Isagi’s own.

They’ve come this far and yet Isagi is still too blind to see that they’re so intertwined with each they may as well already be a bonded pair.

Rin reaches down and carefully runs the back of his hand across Isagi’s plush cheek, his chest clenching with a pang of possessiveness. Sadly, Isagi is no different than any other fickle-minded person. Isagi is always growing and changing his mind, and the possibility of him leaving Rin is already present with the way he talks about finding a mate.

No.

Rin will not lose this.

He will not leave this up to luck or fate. If he wants something he will reach out with his own bare hands and grab it for himself. He refuses to let Isagi make that choice for the both of them so he'll do what is needed and tie Isagi to him forever.

With a baby.

Their baby.

Marriage, mating bites, claimings– they all mean nothing in this day and age. All reversible processes that are broken as easily as promises. But a child? That’s something that will biologically and lawfully keep them chained together for the rest of their lives.

The more Rin thinks about it, the more he wants to see Isagi’s stomach swelling with their pup. It would scratch the itch in his brain that’s been present ever since they started this arrangement. The urge is hardwired into their very nature and he’d only be doing what he was made to do as an alpha of high status. It would also become clear to anyone who looks at Isagi that he belongs to Rin, that Rin was the alpha to mark his body inside and out, and Isagi favored him above everyone else.

Rin runs his hands over Isagi’s face once more, sweeping his bangs off his forehead and carding his fingers through his hair. With slow, deliberate movements, he gets off the bed, careful to not wake Isagi and pads across the hall to the bathroom.

It’s all too easy to put his plan into place. Isagi is too trusting of Rin, not that he has anything to be suspicious of in his mind, but now Rin has full access to his apartment. Replacing the birth control Isagi diligently takes with matching white sugar pills he bought online is easy. Rin’s already stopped taking the contraceptives made for alphas that he was prescribed and condoms were something they never bothered with in the first place.

Patience is all Rin needs now, to wait until Isagi’s heat comes and he calls for Rin like he always does. One of the pros of their new relationship is that they’re able to stop taking their suppressants and use each other as their heat or rut partners. It’s better for their health as athletes to use drugs like those only when necessary.

There’s nothing in his way now. They are both young and healthy, twenty-two and twenty-three respectively, and Isagi's bright eyes and glowing skin practically scream out how fertile he is. Neither of them lacks the money or resources it would take to care for a baby. Isagi is too nurturing and caring to be anything but the perfect mother of their child. Rin has seen firsthand Isagi’s maternalistic instincts kicking in, whether it’s to his teammates or even directed at Rin in some cases. There’s no need for him to worry about Isagi when it’s his desire for a pup that’s caused all of this. All Rin has to do is take responsibility when the time comes and everything else will fall into place.

When Rin returns to the bedroom, Isagi is still peacefully sleeping, completely oblivious to Rin’s scheming. He’s no longer taking up one side of the bed, having stretched out to lay where Rin was, as if unconsciously searching for Rin and the warmth he left behind. As Rin climbs back into bed, Isagi only stirs enough to attach himself to Rin, so much clingier in his sleep than he ever is when he’s awake.

It pisses Rin off.

If Isagi is unable to see that they belong together, then Rin will be the one to open up his eyes.

*****

“Rin,” Isagi awkwardly says as soon as he opens the door. His cheeks are flushed and he’s breathing heavily, in and out of his mouth like he’s just finished an intense training session. “Hi.”

“You’re like a dog waiting by the door for its owner to return,” Rin comments, lowering his fist that barely got to knock on the door twice before Isagi ripped it open. Isagi steps out of the way, letting Rin inside where he puts down his duffel bag full of clothes and personal items he’ll need to last him the few days they’ll be holed up here together. Once the door is shut behind him, he’s suffocated by Isagi’s heat scent, his normal scent is already sinfully sweet and rich but now there’s an extra layer to it. It’s thick like honey, sticky in a way that weighs down on Rin and clouds his mind from thinking about anything other than him.

Heat begins to build in Rin’s core and his mouth fills with saliva. If Isagi were to ask he'd say it’s just a biological reaction, an alpha responding to an omega, but Rin knows that’s not quite true. Isagi’s the only one who makes him like this, whose pheromones even outside of his heat are enough to tempt him. Who makes Rin’s alpha snarl and snap and bare his teeth, canines dripping with claiming venom until he’s reduced to what he is now– a fool willing to do anything and risk everything just to make Isagi his and his alone.

“And what does that make you when you come running every time I call?” Isagi quips back, the corners of his mouth turning up cheekily like he’s proud of himself for returning the jab. Rin doesn’t mind it much, if anything he likes letting Isagi run his mouth while he still can because once they start, he’ll pay him back for it.

And this time that payback will be so sweet.

“Shut up,” is all Rin says, turning his back to Isagi to toe off his shoes. He takes his time with each little action. One shoe off and then the other, rearranging them to sit neatly in line next to Isagi’s shoes. Behind him, Isagi buzzes with impatience, shuffling on his feet and letting out a barely audible huff of irritation. When Rin still doesn’t turn around, instead lazily shrugging off his jacket, Isagi changes tactics.

“But I like that about you,” Isagi tries, opting for flattery over being a brat. “I like how diligent you are.” Isagi's voice drops, slurring the last words and a fresh wave of pheromones crashes over Rin like a tidal wave.

Rin raises a brow and looks over his shoulder but Isagi isn’t looking at him, or at least not at his face. His eyes are completely drawn to Rin’s back, following the planes of muscles there beneath his slim-fit shirt down his shoulders, over his backside, and to his thighs. The horny idiot is already getting distracted blatantly checking him out. Rin lets the glaring compliment fan the flames of his ego but still holds himself back from pouncing with a clenched jaw. He sends his own subtle message, releasing his pheromones, musky and tinged with his oncoming rut, to mix with Isagi’s.

That snaps Isagi out of whatever perverted daydream he was having and he finally notices that Rin has turned to fully face him now. Their eyes meet and Rin’s drawn to the way Isagi’s usual deep blue is all but gone with how dilated his pupils are. The omega’s labored breaths continue and he shuffles on his feet, thighs rubbing together, uncomfortable from the slick that’s no doubt drenching his pants.

Rin reaches a hand out and Isagi falls into him. He traps Isagi’s jaw between his forefinger and thumb, his skin warm and tacky under his firm touch. He brings Isagi’s face within a hair's breadth of his own and watches as Isagi’s lips part and his eyes become lidded. The distance between them doesn’t disappear, Rin only skimming his lips against Isagi’s without giving the other the pleasure of a full kiss.

“Rin,” Isagi whispers breathlessly, clawing at Rin’s shoulder and standing on his toes to bring his face as close as he can to Rin’s. With his hand on Isagi’s jaw, he can easily block him from closing that distance, leaning back to stand up at his full height where Isagi can’t reach him.

A rush of pure power fills Rin’s veins. This is what he craves, what brings him ecstasy more than any goal on the soccer field can. Like this, Isagi is so wretched and under his control that he would do anything just for a taste of him. If only Isagi were this honest with himself when his mind isn't muddled with his heat then Rin would be forced to take advantage of his lowered inhibitions.

“Bedroom,” Rin rasps out, the sudden hoarseness of his voice betraying how affected he is by Isagi. “Now.”

Isagi’s brows pinch together but he doesn’t put up a fight, quickly letting go of Rin and running down the hall to his bedroom.

Rin takes advantage of the sudden space between them to close his eyes and take a deep breath. He lets Isagi’s scent, his voice, and the image of him writhing beneath Rin sink into his bones. It’s so easy to picture with how many times they’ve done this song and dance– Isagi’s who's equally as desperate with legs spread, back arched, and hips working to grind against Rin’s stiff length.

He feels like a wild animal.

Nails dig into his palms as he clenches his fists, veins bulging as a deep rumbling rises up from his chest and spills out his throat. All he can hear through the rapid pounding of his heart is the grinding of his teeth punctuated by harsh exhales. The metallic tang of blood floods his mouth from the way his sharp fangs drag against the inside of his cheek, itching to latch onto something.

He feels like a monster.

His entire body pulses with a desire akin to bloodlust. An insatiable hunger bubbling right beneath the surface of his skin. It threatens to boil him alive from the inside.

His cock begins to harden, a heavy and hot weight between his legs. A fit of mindless possessive anger ignites in him, no longer a low-burning hearth but a wildfire that will burn everything in its path to get to his omega.

This is what Rin was waiting for. He lets his rut take hold, losing control of his inner alpha as he huffs and puffs and gnaws on his bottom lip. His instincts are all he needs to guide him so that he can be sure to form a knot, to breed Isagi, to impregnate him.

To devour his omega.

It’d be cruel at this point to make either of them wait any longer so Rin doesn’t waste another second and stalks into the bedroom like a predator on the hunt.

“What took you so long?” Isagi demands, sitting up on his knees in the middle of his bed. In the two or three minutes that Rin left him alone, Isagi already discarded all of his clothes. Perched in his nest like a feast splayed out on a table, Rin hungrily eats up the sight of him.

Isagi climbs closer to the edge of the bed, the bright sunlight coming in through the window casting an angelic glow around his head and shoulders. His beautiful skin is tanned with more color than Rin’s paler complexion and is free from any marks of their past trysts, Rin making a mental note to fix that. The evidence of Isagi’s arousal is blatant with the way his own straining length proudly stands against his lower stomach, the tip pressed smearing precum there when his hips shift. Rin would find it a much more enticing sight if he wasn’t so distracted by the annoying way Isagi’s bottom lip juts out like a petulant child.

With him already naked and squirming, Rin makes a beeline for the bed without stopping or slowing down. A nasty snarl fills the room as Rin tugs his shirt off over his head and tosses it aside. Isagi almost falls off the bed in his haste to meet Rin halfway, stretching up at the same time Rin dives down to take his mouth in a heated kiss.

It’s always a fight between them at first, Isagi pressing in on Rin to try and take the upper hand as both arms wrap around his shoulders. Deft fingers card through his hair at the back of his head to tug at the strands and keep him close. Rin wraps one arm around Isagi’s waist while the other steadies them on the bed by Isagi’s head. He guides Isagi down onto his back, forcing his way between his thighs where he uses the solid weight of his torso to trap him against the bed.

It takes hardly any coaxing to get Isagi to part his lips so that he can deepen the kiss, licking at the roof of his mouth and sucking on his tongue. Isagi melts, dropping any pretense that he has even an ounce of control in this situation. Rin groans his approval in Isagi’s mouth, encouraging the omega to fully submit to him.

Once Isagi becomes too blissed out, succumbing to his heat, and can no longer return the kiss besides letting Rin lick and suck and stroke into his open mouth, does Rin move on. He gives Isagi's plump bottom lip a harsh bite before moving down his jaw and to his neck, harshly nipping along the column of his throat until his blood vessels break and warm blood pools under the skin.

As if not to be outdone, Isagi scratches his nails across Rin’s back as if determined to add to the collection of tiny white scars that already litter his skin. At the same time, Isagi shifts his hips to hook his legs around Rin’s waist and bring their bodies flush together. He grinds against Rin’s clothed erection causing his own leaking tip to smear against Rin’s lower stomach. They both shudder at the friction, gasps and groans filling the air.

Even as a lightning strike of pleasure shoots up Rin’s spine, he sits up out of Isagi’s hold and wraps his hands around the omega’s lithe waist to stop his hips moving before he can get too much pleasure of his own.

“Rin,” Isagi immediately whines in protest and tries to wiggle out of his hold. “C’mon, it’s not fair.” He reaches up with both arms but can’t quite reach around Rin’s neck this way. He settles on groping at Rin’s chest instead, palms of his hands cupping his firm pecs before trailing down to his abs and leaving behind goosebumps in their wake. “We both know you’re just as desperate.”

Rin revels in the way Isagi touches him, smaller hands that can be so vicious yet gentle when they want to be. Like right now he caresses his body without any shame, his eyes following the same path as his hands. Once he reaches the edge of Rin’s joggers, he teases his fingers under the elastic waistband and pulls at the drawstrings. Rin resolutely watches Isagi’s face and the way he falls into playing the part of a demure omega, seductively biting his lower lip and flicking his gaze up to look at Rin through his lashes.

During his heats, Isagi becomes so needy, clinging to Rin and erasing all space between them like he’s trying to burrow underneath Rin’s skin. He’d let him, let Isagi nestle himself between his ribs if it meant Rin could eat his heart in return.

“I–I feel weird today,” Isagi stutters and fidgets under Rin’s heated glare, trying a different approach when Rin doesn’t react the way he was hoping for. Of course, he feels off, he’s unknowingly been off his birth control for a few weeks now. This might be the first time he’s going through a heat without the intervention of hormones. Rin only bothered to research as much as he needed to know so what he does know is that Isagi’s ovulating for the first time in who knows how long. Even if he hasn’t consciously become aware of it, it’s clear that his body and primal need as an omega in heat are urging him to get pregnant. “I can’t wait. Need you now.”

“Be patient,” Rin husks even as he leans back to shuck off his pants and briefs in one go.

“Haa, fuck you,” Isagi huffs out, a bout of irritation taking over him because of Rin’s nonchalance at his predicament. The typical Isagi, the one that Rin knows best, rears his head like he’ll die if he can’t go one fucking minute without pissing him off. The third time's the charm because, in his next attempt to get Rin to cave into his demands, he opens his filthy mouth to spew out, “The only reason you’re here is to keep me satisfied. If you can’t even do that much anymore, I have no issue with finding someone else.”

And well, Rin already holds no remorse for what he is about to do, but now? Now he is going to get a vindictive thrill out of fucking Isagi and not stopping until he’s stuffed with his seed and bred so thoroughly that there will be no doubting who owns him. Isagi will choke on those words. He will be trapped and bound to Rin until his dying breath. And he’ll have no one to blame but himself.

“As if you could find a single shitty alpha out there that makes your whore mouth beg for their knot the way you beg for mine.”

Isagi’s breath hitches and he whimpers but Rin doesn’t give him any more time than that to react when he grabs the back of Isagi’s thighs and folds him in half. Like this, Isagi's knees are pinned up by his head, his bare ass in the air and on full display, locked into place by Rin’s unyielding strength.

“What are you–” Isagi starts to protest but cuts himself off when he catches the look on Rin’s face. Based on the way Isagi swallows harshly and his eyes glaze over, Rin can guess what he must look like. He can feel it too, the way all his energy devotes itself to this one moment, and his every nerve fires with the singular purpose of destroying. It’s not unlike the way he sometimes gets on the soccer field, where the white of his eyes turn pitch black and his veins bulge out of his skin in preparation for a bloodbath.

He’s been called every name in the book.

A freak.

A weirdo.

A beast.

Oh does he feel like one.

Isagi squirms under his wolfish gaze, kicking his leg out but held firmly in place by Rin. He wants to run away, to hide, to burrow somewhere safe away from Rin but his body tells a different story. The scent of Isagi’s exposed arousal makes his mouth water and he doesn’t need to look down to know how wet Isagi is for him. His slick is heady and in the throes of his heat it might as well be a drug that Rin’s long been hooked on.

Rin opens his mouth and lets his tongue loll out, zeroing in on the glistening slick pooling around Isagi’s puckered rim. A glob of saliva rolls down his tongue and Rin holds still as it ever so slowly drips from his mouth and lands on his sensitive hole that twitches with the need to be filled.

“Oh, fuck,” Isagi breathlessly moans and fists his hands in the bedsheets.

Rin savors the sight for only a moment before diving down, licking up his own drool that’s mixed with Isagi’s cooling slick and pushes it past his rim into his heat-loosened hole. The sweet taste of citrus and sage and Isagi floods his tongue and does nothing to curb his appetite. He prods at Isagi’s insides, the heat almost too much as he flattens his tongue, giving a long, lagging lick that gathers up slick before swallowing it down and repeating.

The first few licks have Isagi bucking his lips, trying to grind against Rin’s face for more friction but Rin doesn’t let him. His grip on Isagi’s thighs turns bruising, pausing for a moment to sink his teeth into Isagi’s ass cheek as a warning. No matter how many times they do this, his omega continues to act obstinate to Rin’s aggravation.

Isagi yelps from the bite and glares up at Rin.

“Quit moving around,” Rin chastises with another aching squeeze to Isagi’s legs, restricting his movements. “You’ll take what I give you or get nothing at all.”

“Such a jerk,” Isagi huffs out through clenched teeth, tears prickling at the corner of his eyes.

“You like it.” It’s not a teasing remark, just Rin stating a fact because he’s never once tried to hide who he is and yet Isagi is the only one who keeps coming back like he can’t live without him.

Rin adjusts his hold so that he can bring one hand up alongside his tongue that’s gone back to lapping at Isagi’s rim. Two fingers slip inside without any resistance, working him open and coaxing more slick to gush out. He picks up the pace, fucking Isagi with his fingers while continuing to prod at his entrance, his tongue lavishing him licks and tugging at his rim. Obscene squelching noises fill the air from how soaked Isagi is, slick coating Rin’s tongue and dribbling down his chin.

“Nngh, Rin!!” Isagi cries, reaching his hand up to card his fingers through Rin’s hair and tug. His pretty breathy noises go straight to his cock, hard and leaking precum and demanding his attention. “More, hah, hurry! Need more!”

Isagi starts panting but they both know it’s still not enough for either of them. It’s not the same as the burning stretch that Rin’s cock gives Isagi. They won’t be satiated with this and Isagi’s heat will keep ravaging his body until he gets more than a few fingers to fill him up. Rin scissors his fingers, Isagi’s velvety hot insides giving way to the intrusion and pushing Rin to his own limit when it’s so clear that Isagi’s ready for him.

Isagi’s body writhes and he throws his head back with a strained cry. All the telltale signs of his impending orgasm are there– the fluttering of his hole around Rin’s fingers, how his lower abdomen clenches, the way the pitch of his slutty moans raises an octave. He pistons his fingers in and out a few more times, leaving another long, wet stroke of his tongue on Isagi’s hole before he pulls his fingers out at once and leans back. Releasing his death grip on Isagi, he lets the omega drop back to lay flat on the bed, a haze clouding his eyes as his mind catches up to what’s happened.

Isagi stays tense for a few moments and blinks in confusion as he backs away from the precipice Rin wouldn’t let him fall down. Hot anger flashes across Isagi’s face and he lets out a litany of curses all aimed at Rin but Rin just ignores him and wipes away the wetness on his face with the back of his hand. Throughout his heat, Rin will bring him to orgasm at least two dozen times. There was no real need to deny him an orgasm besides the fact that Rin felt like it, that letting Isagi get so close to what he wants and then being the one to take it away fuels him with a high unlike any other.

“Don’t be ungrateful,” Rin grunts and he grabs Isagi’s ankles, flipping him over onto his stomach. He doesn’t wait for Isagi to do it himself, manhandling him until he’s propped up on his knees, ass in the air and his face shoved into a pillow, forced into presenting himself for Rin’s taking. “I’m about to give you what you want.”

“Then hurry it up already!” Isagi bites back, turning his head to the side so he can look back at Rin over his shoulder.

Rin delivers a swift swat to Isagi’s ass making him yelp but positions himself behind him, giving his neglected cock a few strokes. He presses a palm down between Isagi’s shoulder blades, pinning him down and ensuring he can’t run. Guiding his tip to Isagi’s hole, he effortlessly pushes past his rim and bottoms out in one, quick thrust.

There’s a reason Rin has forced Isagi into a mating press when he normally wouldn’t care because, in this position, he can penetrate Isagi as deep as possible to make sure his seed will catch.

“Fuck,” Rin grits out through his teeth. The initial slide-in still feels so good. Isagi molds to him, squeezing him tight to keep him inside like they were made to be joined.

“Full,” Isagi mewls, the sheer relief he feels at finally being penetrated clear in his voice and the way he turns pliant under Rin. He lets out a content sigh and then lets out something like a giggle, a delirious little noise that arouses Rin's prey drive. “So full– hmm, so deep…”

Once he’s pressed inside to the hilt, Rin doesn’t start slow or build up a gradual pace. He pulls out until only his tip remains inside, then with one hand anchored on Isagi’s back and the other next to his head on the pillow, he snaps his hips forward and starts fucking Isagi with reckless abandon. There’s no point in letting Isagi acclimate when he’s already soaked and would only end up whining in Rin’s ear for him to go faster.

A babble of incoherent words falls out of Isagi’s mouth as Rin aggressively pounds into him again and again, swallowed up by Isagi’s warmth each time. Isagi scrambles for purchase by bracing one hand on the headboard in front of him while the fingers of his other hand clamp around Rin’s wrist.

“So good, alpha,” Isagi gushes, his body jerking forward with each slam of Rin’s groin into his perky ass. Rin starts to get lost in his own euphoria, lightning striking up and down his spine as Isagi’s intoxicating pheromones morph him into something feral and rabid. “More, please I want more! Gimme more! Alpha!”

Being referred to as alpha has never done anything for Rin. Being the “ideal” alpha, the toughest or most dominant, Rin’s never given a shit about that. Their designations mean nothing to him. It doesn’t matter what they are– they’d end up like this no matter what because they are Rin and Isagi. He doesn’t need to be called some generic worthless title that Isagi could call anyone else. What he wants is something beyond that.

“Say it,” Rin demands, taking a fistful of Isagi’s hair and yanking his head back, making his back arch like a cat and switching up the angle he’s hitting Isagi at. “Say my name.”

Isagi chokes from the sudden stinging pain on his scalp but quickly wails out, “R-Rin!”

If there were any rational thoughts left in his head, they’re all gone now and replaced with the lust-driven obsession to keep Isagi at his mercy forever. “Who’s fucking you right now?”

“You are, hngg!!”

“And who do you belong to?” Rin asks, his head filling with chants of breed him, mate him, claim him.

“You!” Isagi sobs. “Rin! I belong to Rin.”

Satisfied, Rin lets go of his head and focuses on making sure he stuffs Isagi full of his cum. Both his hands now clutch Isagi’s waist, pulling him back onto his cock to match the rhythmic way he sinks inside him. Isagi’s too useless to move himself, drooling onto his pillow and moaning pitifully every time Rin plunges into him.

The sounds of their mating fill the air, Rin’s animalistic snarls and grunts overlapping with the sticky, wet slaps of their skin slamming together. His chest heaves, breath turning ragged and sweat building up on his skin from the exertion. The muscles on his forearms bulge, his veins burning hot from his rut and driving him toward what he needs to do.

Looking down and watching his length disappear inside Isagi’s body, he knows he won’t last much longer. His knot is beginning to swell at his base by the dark, coarse hairs near his groin. He doesn’t need to hold back and drag this out, if anything the more times he cums in Isagi the better chance they’ll have at conceiving. This is only round one now that they’re both at the mercy of their natures.

A burning heat pools low in Rin’s core and his cock throbs, turning his movements into erratic jerks as his hips lose their steady rhythm. The drag of his skin against Isagi’s insides has him grinding his teeth, so sensitive, and driving him into a frenzy. His knot fully forms, the girth of it not letting him hit as deep as he was and it makes his vision turn red, securing his grip on Isagi’s waist as he gets ready to shove himself fully into Isagi.

“Please… inside,” is all Isagi can manage to spit out when he feels Rin’s knot start to nudge at his rim. Tears are spilling down his face and the last thought Rin has before sinking his knot into Isagi and locking them together is that he hopes their baby gets Isagi’s striking blue eyes.

Isagi howls and throws his head back as the shockwaves of Rin’s orgasm hits him. He falls over Isagi’s back from the dizzying rush that makes his head spin, his cock pulsing inside Isagi as his walls clamp down on him.

“So fucking tight–” Rin hisses as fucks Isagi through it, giving little thrusts to make sure he pumps Isagi full with every last bit of his cum. His knot, completely engorged and nestled inside Isagi, binds them together and leaves no room for even the tiniest of drops to spill out of, ensuring that it’ll take to his ready womb.

Rin doesn’t know if Isagi cums, doesn't really care if he did or not when it isn’t necessary for bearing a child, but based on the way he shudders, clenching around him and moans like a whore, he'd say he did. Isagi’s eyes roll back and his body that was sprung tight like a coil relaxes all at once.

Then, unceremoniously, he passes out.

“Your stamina sucks,” Rin says with an annoyed click of his tongue and runs a hand through his sweaty hair, pushing his bangs off his forehead.

Slowly coming down from his high, he readjusts them, pushing Isagi’s dead weight onto his side so he can lay behind him while they wait for his knot to go down. With the room now quiet as their harsh breaths return to normal, Rin settles himself comfortably behind Isagi, nosing at the nape of his neck and licking away the sweat on his scent mark. He wraps his arms around Isagi’s waist and presses a flat palm down just below his navel where there’s a slight bulge.

He’s not pregnant yet but there’s no way he won’t be after this. Even if this particular load doesn’t take, one of the next few he’ll give Isagi over the course of his heat will. There’s no way they won’t get a baby from this. His plan will work.

It’s what’s right, Rin thinks and he scrapes his teeth against Isagi’s scent gland, eliciting a shudder out of the still unconscious, yet sated, omega. He’ll worry about properly claiming him another time, but for now, having Isagi wrapped in his arms is enough to calm his inner beast.

*****

It takes less than a month for Isagi to come to him once again.

He’s standing in Rin’s entryway, shoes still on like he’s a skittish animal ready to bolt at any moment. He looks worn out and Rin takes note of the bags under his eyes, how his usually kept hair is messy, strands wild like he’s been running his fingers through them. There’s even a faint trace of wetness in the corners of his eyes as he tries to hold back tears.

He must’ve spent every moment since figuring out he was pregnant stressing over what to do. Stressing over Rin. Constantly on his mind and thinking of no one else when it’s his child inside him.

Isagi sighs, breaking the silence between them and steeling himself, he meets Rin’s bored expression with fire in his eyes and announces what Rin already knows. “I’m pregnant,” he blurts out like ripping off a bandaid.

A beat.

“I can tell,” Rin says unconcerned.

“You– what?”

“I can smell it on you,” he adds as an explanation. He can. It’s so obvious when Rin searched for it in Isagi’s scent the moment he showed up at his door. It’s different from when couples mark each other and their pheromones mix into something that signals their new bond. Instead, Rin can still sense Isagi’s unique scent, it's a little bit sweeter and a little more enticing, but his own musky scent is there. It doesn’t blend with him but wraps around Isagi like a protective blanket and best of all, it’s lodged itself deep inside him like a brand cast with hot iron.

Isagi lets out a steadying breath and visibly relaxes. “Then you can tell it’s yours.”

“Tch, whose else would it be?” Rin turns and goes to sit on his couch, forcing Isagi to follow him inside.

Isagi scrambles after him, messily taking his shoes off but maintains his distance and opts to stand in front of Rin. His eyes dart around the room, refusing to settle on Rin’s face, and he wrings his hands in front of his chest saying, “I don’t know what happened.”

And he doesn’t ever need to.

“We’ve always been careful and never had a problem before,” Isagi continues.

Not true. They haven’t used condoms since after their first few tumbles in bed, once they agreed to this arrangement and deemed it safe to do so. While the birth control each of them was taking worked perfectly fine, it wasn’t all they could’ve done to prevent this. Not that it matters anyway, Rin would just poke holes in the condoms if Isagi had suddenly made him wear one.

“But,” Isagi says, pulling Rin’s attention back to him. “I’ve decided I’m going to keep it.”

Of course he is.

He looks at Rin then, eyes hardened with determination but Rin can see he’s still scared, terrified even, of how Rin is going to handle the news. His chest rises and falls heavily as he waits to see if Rin will lash out. If he’ll reject Isagi, reject their baby, tell them they’re on their own. Whatever careful calculations or predictions Isagi made in his head about how Rin will react, Rin will have to disappoint. Isagi should know by now that Rin is always two steps ahead of him.

“I’ll take responsibility.”

Isagi shakes his head, not believing what he’s hearing. “You will?” The clear surprise in his voice ticks him off.

Rin crosses his arms over his chest. “What kind of alpha do you take me for?” Isagi's face twists into something unpleasant and Rin can see the slew of insults flying through his mind.

Isagi answers his question with one of his own. “I mean, you understand the gravity of having a child right? We’d be parents. Forever. I grew up under one roof with both of my parents who have loved me and supported me through everything. I want as much for my own child,” Isagi looks down at his feet, a pinkish hue blooming on his cheeks, “both parents present… under one roof. Caring for each other and working together like a real family…”

Rin can take the hint but as he stands up from the couch, all traces of shyness evaporate from Isagi as he returns to his aggravatingly confident self. The air around Isagi begins to sour from his pheromones, a warning aimed directly at Rin.

“So I will not tolerate the father being a disrespectful asshole,” Isagi bites out, sneering up at Rin. “If you’re going to do this, you have to give us your everything.” The defensive threat in Isagi’s voice is clear as day, his maternal instincts already kicking in, ready to do anything for their baby. Good. Rin wouldn’t accept anything half-baked anyway.

He might as well be rambling at Rin now but all that tension and stress can’t be good for the baby. Rin takes a step forward, crowding into Isagi’s space, and tilts the omega’s head up with one hand under his chin until their eyes meet.

“I will take responsibility,” he repeats. “For our child.” He leans down, marveling at the way Isagi’s eyes widen with every inch he erases between them and presses a chaste kiss against his lips. Pulling back just far enough, he whispers against his mouth, “And you.”

It’s a shock to Rin, the rush of fierce protectiveness that possesses him in response to Isagi’s… everything. When he was younger, he used to easily spit out threats like I’ll kill you at Isagi which later turned into a declaration of their rivalry, something that made them push each other to their furthest limits on the field. But now…

Now if someone dared to hurt a single hair on Isagi’s head, he’d kill them in the most faithful interpretation of those words.

A warm puff of air escapes Isagi’s mouth and fans across Rin’s lips. “Are you sure? Because I've had time to think about this so if you need more time too then that's perfectly reasonable and I—”

Rin’s been thinking about this for a lot longer than Isagi can fathom. There’s a storm brewing in him, different from his rut or the initial jealousy that drove him to do this in the first place because his plan worked. Isagi is here before him, carrying his child but it’s not enough. Still not enough.

No longer interested in listening to Isagi patronize and doubt him, Rin scoops Isagi up in his arms and moves down the hallway.

“Hey, don’t ignore me!” He wraps his arms around Rin’s neck to keep himself steady. “Where are we going?”

“Bedroom.”

“What flipped your switch?” Rin doesn’t answer. “Typical alpha,” Isagi mutters but he doesn’t put up a fight and lets Rin carry him into his room.

“Gotta make sure Mommy and Daddy get along,” Rin raises a brow, challenging Isagi to disagree as he lays him down on the bed, “for the baby’s sake.” He’s only listening to Isagi’s demands so he should have nothing to complain about.

“You…” he starts to retort but trails off, looking at Rin with a critical eye. He unwinds his arms from Rin’s neck and falls back onto the sheets, doing that stupid thing he does where he overanalyzes every little detail he can find. His pinched expression slowly morphs into glee, his eyes brightening and a too-wide smile taking over his face at whatever conclusion he’s come to. “You like me, don’t you?”

“No,” Rin answers just because the smug look on Isagi’s face irritates him. “I’m just claiming what’s mine.”

*****

“If that blond roach bastard calls me Daddy one more time, I’m going to punch him in the throat.”

Seven months later they’re all gathered at Rin’s apartment, or his and Yoichi’s apartment since the omega moved in with him for the time being. They’ll figure out the logistics of their family once Yoichi returns to playing soccer at another time but this is what works for them both for now. What doesn’t work for Rin is the fact that all of Yoichi’s friends are at their apartment for the makeshift baby shower those nuisances had insisted on throwing.

His brother was invited and actually showed up, which means that insect he calls a mate is also here.

“Please don't,” Yoichi pleads with a forced laugh and looks around at his friends scattered across their living room.

Rin wants them gone. They’ve invaded his space, his den, with their nauseating pheromones. Then there’s the staring, the looks and glances they keep giving Yoichi, who over the past few months has begun to glow with his pregnancy. His face is rounder, skin soft and supple, and best of all his scent has ripened. Yoichi was made to carry Rin’s pups and everyone can see it.

He wishes they didn’t.

If another person tries putting their hands on Yoichi’s round belly, he’s going to start breaking fingers.

Noticing Rin’s rapidly declining mood, Yoichi scratches his fingers along the back of Rin’s neck, carding through his hair and rubbing his wrist along the skin just below to scent mark him. He thumbs at Rin's scent gland, the pad of his finger running over the uneven skin of the bite mark that’s now imprinted there proudly like a tattoo.

It works, soothing him momentarily and filling him with a need to be alone with Yoichi, where it’s the two of them and Rin can douse them in his scent and keep them safe. A round of obnoxious laughter from his unwanted guests reels his attention back to the group of them chatting in the living room.

“For Isagi’s sake, I hope the baby’s nothing like Rin,” Sae says flatly, much to the amusement of everyone else in the room. “He was such a troublemaker, jumping off jungle gyms and terrorizing the other kids in his class, even as a kindergartener.”

Shidou laughs and flops down on the couch next to Sae, giving Rin a shit-eating grin. “So our little Rin-Rin has always been a freakshow.”

“He was cute though,” Sae adds as an afterthought.

Rin has a few choice words he could use to describe Sae if they’re going to talk family but before he can, Yoichi puts a hand on his arm and guides him away.

“Let’s take a break, shall we?” Yoichi half drags him outside to the balcony where the fresh air has them both taking in a deep breath.

“We don’t need any of their damn gifts,” Rin grumbles, remembering the pile of prettily wrap boxes and bags sitting on their table that grew as more people walked through the door. He’s already thinking about the best way to return everything, not wanting to tolerate their baby using a single thing those scrubs picked out. “I can provide for us just fine.”

“So can I,” Yoichi rolls his eyes at him, “but it’s about them doing something nice for us.”

Rin lets out a grunt in reply, his expression remaining the same, mostly blank but for the slight tick in his jaw.

“Rin,” Yoichi says sweetly, taking the chance to change the subject and bat his eyes up at him. “It’s kinda cold out here.”

He’s not a pushover but he feels immense satisfaction in the fact that Yoichi is always relying on him, coming to him with all of his problems no matter how small or insignificant. It might just be the alpha part of his brain preening and showing off to his mate, the one that’s carrying his child, or he could be weak to Yoichi’s cute face. Either way, Yoichi belongs to him. He got what he wanted and now he’s determined to keep it because even if this scheme was born out of pure desperation, Yoichi now looks to him for everything and Rin eats it up. He’d do anything for him, including becoming a monster that will stop at nothing for the sake of their family.

“Then go inside. Don’t complain to me,” he huffs back even as his hands come up to Yoichi’s jaw, framing his face, and he gazes at him with his full attention. He leans down to kiss Yoichi’s waiting lips as smaller arms wrap around his waist. Bringing him into a hug, his own arms engulf Yoichi, rubbing up and down his back to hopefully warm him up. Yoichi turns his head to lay it against Rin’s chest, searching for his heartbeat and finding the way it beats a little quicker than normal.

“You love me.” It’s no longer a question. Rin can feel the pull of Yoichi’s lips up into a smile even through the fabric of his shirt.

He does love Yoichi but he will never know the full extent of that love and what he was willing to do in the name of it.