Chapter Text
It’s a terrible idea to send an alpha and an omega on a mission together, especially since Satoru’s so close to his rut and Suguru’s heats are unpredictable. Especially worse when the mission requires them being there overnight. They’re in separate rooms, but hell. Bad idea.
Satoru’s ruts are at least somewhat controlled. He takes strong suppressants, his clan schedules his ruts and they pay professionals to spend them with him. Never unmedicated, always keeping some semblance of control and never letting him get into full rutting alpha mode, because the thought of that is a goddamn disaster waiting to happen.
He’s moody and snappy and growls at people, though, and Suguru’s annoyed with him.
“Do you have to act so much like a horny fucking mutt? We’re not here to antagonize anyone.”
They’re there to retrieve a cursed object, neutralize a first grade curse in the woods and for Suguru to consume it. It’s far away from Tokyo, so they’re spending the night at the local inn.
Suguru’s suppressants are not nearly as good as Gojo's. He’s on the standard shit and they’re supposed to be effective. As effective as they can get. They’re a little unstable when it comes to omegas like him, someone tall and active with a lot of muscle mass, but doctors said he should be fine as long as he doubles the dosage. One thing the doctors can’t account for, though, is Suguru’s cursed technique, the constant vomiting, the fucked up biology. The way curses interact with his body and hormones.
More than one, there’s been curses that triggered painful and violent heats soon after he consumed them, and never really knowing how it will affect the way he acts or smells.
“God, Suguru,” Satoru complain after he swallows the little black ball of curse, “Why do you smell like that?”
He looks a little nauseous.
“What do I smell like?” He doesn’t really feel different, doesn’t think the curse will trigger something inside him. Still, you never know. Instinctively, he puts a hand on his neck and fidgets with his choker.
He wears a thick leather choker around his neck to prevent any unwanted bites. Not that he really needs it, he’s more than capable of protecting himself most of the time, it’s just - it’s better to have it, you know? He’s been bitten by alphas before, in moments where he wasn’t in his right mind, when he couldn’t do anything to prevent it. He doesn’t want to repeat that.
“You smell like… Ugh - ” Satoru snarls, “Fuck, I dunno. You just smell like something .”
It’s not like he’s scared of Satoru, but he’s unsettled. He doesn’t say anything as they go back to the inn, but he does close the door behind him. He goes to shower off the grime of the curse off himself.
Meanwhile, Satoru can - smell him. Through the wall. The crack under the door. The open window. Suguru leaving a trace of himself behind him. And Suguru smells good, he smells so much better than the professional rut companions he usually spends his ruts with. Suguru smells like an omega he wants. And he -
He really just wants to take a peak at him. See him. Talk to him.
He’s been overly aggressive for a few days now, catching himself with his fangs out and wanting to bite into things. Maybe he should get some alpha chew toys next time he’s force to go on a mission with Suguru so close to his rut.
Suguru’s door is closed but it’s not locked , so Satoru opens it slowly and instantly there’s the smell, the exciting Suguru’s smell that made him come here in the first place. The shower is running in the bathroom and the door is cracked open. Logically, the door to the bathroom is open so steam doesn’t build up, but there’s a part of Satoru that thinks of it as an invitation.
Why wouldn’t it be?
Suguru could have just locked the door, if he didn’t want Satoru barging in on him. He could have locked the door to the bathroom too.
And he’s not planning on going in on him, he just wants to see him! And he doesn’t have to stand in the doorway like a creep, his Six Eyes can see through the cracks, see through the door, see through the steam. Suguru’s body as he takes off his shirt. His naked chest and the little brown nipples. Suguru bending over and taking off his pants. The muscles of his abs, the thick thighs, getting to see Suguru’s ass as he gets into the shower and seeing his cunt.
It’s not like he wants to be a creeper, but he can feel the way his blood starts boiling, how his cock hardens and his minds starts making up all these scenarios. How he can just go there and get in the shower with Suguru. Finger him. Eat him out. Bend him over and fuck him. Pump him full of cum and knot him.
He takes a step forward and stops himself, goes back to his room and slams the door shut. His cock is so hard, but he doesn’t want to touch himself because it feel wrong. Satoru doesn’t want to be that kind of asshole alpha. He’s not like that!
But he can’t stop thinking about it either.
Suguru’s pussy. Suguru naked. Suguru with his omega collar on. Suguru would look good with his cunt spread on Satoru’s cock.
It starts getting dark outside, and at some point, Suguru comes over to his door and knocks.
“Hey, do you wanna go have dinner?”
Suguru’s so nice, checking up on him. He’d make a lovely mate, wouldn’t he? He realize his thoughts are getting more and more feral, and he can’t really stop them, and Suguru’s scent is so so close.
“Hmm, I’m not hungry.”
A pause. Satoru really needs him to leave.
“Are you sure? I’m gonna get myself something from the conbini down the street. I can get you something too.”
You, you, I want you, can I get you? I want you.
“It’s fine, I don't want anything.”
There’s no way he’s getting any sleep tonight. He’s feeling antsy and hot all over, and his fangs fucking hurt, they ache with the need to bite into someone, something, anything. He’s not supposed to be in rut and he really isn’t, not really, it’s not…is it? It feels worse than a rut, it feels too sudden. Like going from zero to one hundred in a second, while usually is more of a gradual descent. He feels feral.
It’s starting to get dark and he hears Suguru when he comes back from the conibi stops in front of Satoru’s door and knocks.
“I got some food for you too. Can you open up?” Satoru doesn’t think it’s a good idea to answer. Suguru sighs. “Fine, you don’t have to. I’ll just leave it out here.”
He leaves, grumbling something about rude alphas. Satoru hears him shutting the door to his room.
No lock.
If he wanted to….
He just sits there while it’s getting darker and darker, trying to convince himself it’s a bad idea to go to Suguru and finding his own arguments less and less convincing. And he can hear him in the other room, as how he’s moving about, he swears he can smell him, obsesses over how Suguru would taste.
Finally, after a few sleepless hours pass, he gets out of bed and goes to Suguru’s room. Slowly opens the door, trying not to make a sound as he steps inside. Suguru’s sleep on the bed, so Satoru goes in and locks the door behind himself.
The whole room smells like Suguru, so intensely that it makes him do a double take. Suguru smells so good, clean and a little salty, Suguru smells like the sea and he wants to dive into that lovely scent and drown in it. In waves. Drink it in.
And when he’s asleep, Suguru is so beautiful. His hair is messy and spread out on his pillow. His shirt rides up and exposes his skin. His shorts ride up over his ass. And Satoru’s cock is so hard, it feels like he’s been hard for hours already, since he first caught the scent of Suguru’s enticing smell. He opens his pants and pushes them off, grabs his cock through his underwear and fondles it.
Suguru looks like he’s really deeply asleep. Satoru ventures a little closer, puts a knee on the bed and leans over him to sniff him, feel the enticing heat radiating from his body. Suguru’s breathe comes out in short puffs of air, his lips are slightly open and he wants to press his tongue between them. Instead, he pulls his dick out from his underwear, hard and leaking with precum, and he rubs it against Suguru’s soft skin, smearing wet on his thigh as he jerks off. He wants to touch Suguru so badly, wants to grab him and grope him and caress him and fuck him and make him cum.
There’s a part of his brain that keeps telling him to stop, stop, stop, go back, but that part is distant and quickly getting more and more drowned in the hazy fog of lust that consumes his brain. Can’t think of little else other than sex, thinks about mating and biting and breeding. The elastic of Suguru’s pants is soft and his pants are loose, so he hooks his fingers under the edge of the band and pulls them down his ass, gently down his thighs. It’s so warm in the room that he doesn’t really notice it, Suguru just sighs when Satoru undresses him. Turn on his back with his legs open, and Satoru kneels between his spread legs, carefully.
He touches his thigh, runs his big hand up and down Suguru’s inner thigh, and stares at the dark patch of hair between his legs. Wants to run his finger over the slit of him, press his mouth there, where the taste of him is strongest. Suguru’s shirt rides up a little and Satoru pushes it up more, underneath his armpits just to expose his chest. The muscles on his chest are soft and relaxed as they move in his sleep, nipples brown and cute, and Satoru wants to bite them. They say that if you bite omegas on their chest, they go all soft and sweet and needy.
Satoru inches forward and presses his cock against Suguru’s pussy, presses the shaft of it between his folds just to feel him. The soft hair that tickles him, the wetness, the warmth, the silken feel of him. He shivers and rubs against him, up and down, the girth of his cock spreading Suguru’s lips wider as he teases himself with the feel of him.
The heat and wetness of Suguru’s pussy clings to his cock even as he pulls away, and he throws his head back as he jerks off, biting his lips so he stops himself from making noise. There’s a window right next to the bed and the curtain is pulled, and so there’s moonlight coming into the room, bathing Suguru’s body in soft light, throwing shadows over his naked skin, long hair, beautiful face. Long lashes. Soft lips. The omega collar on his throat.
Satoru palms Suguru’s pussy and makes him sigh in his sleep, shhhs him softly and then spreads his folds open with his thumb. He grabs his cock squeezes it at root, where his knot is supposed to form, squeezes himself hard and jerks upward, slow and firm, until there’s a bead of precum forming at the tip. He presses it against the glistening pink skin of Suguru’s pussy, rubbing his wet cockhead between Suguru’s lips, pressed against his clit.
He presses the tip of his dick against Suguru’s hole just because he wants to see how he feels inside. Just a little. He just wants to be inside him a little bit, if he only puts the tip in is not that much, he can jerk off the rest and pretend, he just -...
But Suguru’s body feels so good, his little hole is so tight and wet, because Suguru’s an omega and his body reacts to Satoru’s presence, his body feels Satoru’s arousal and needy lust driven pheromones he gives off and reaches out to him. Suguru’s body was made for being bred by someone like him, so of course he’s ready for him, of course his hungry little hole sucks Satoru in easily and before he realizes it, he’s inching inside. Not the whole length of him, that would be too much, to sudden, he just…it’s just a little. Halfway, maybe. And then he rolls his hips, slowly, slowly, because he doesn’t want to disturb Suguru, he just wants to know what it’s like to thrust inside him.
Suguru’s cunt drips when Satoru thrusts in and out, so good, Suguru’s body is so hot and tight and wet for him. Made for him. And he just needs Suguru so much, and he tries to be gentle with him, but his thrusts start getting rougher and it’s getting so much harder to keep himself in check. His fangs are out and they almost tingle, he wants to bite into Suguru’s skin so badly.
Then, Suguru’s sighs and moans, but his eyelashes start to flutter open. Satoru feels a burst of arousal shooting through him, excitement and dread at the thought of Suguru waking, but instead of making him stop it just makes him thrust harder, making Suguru cry out. His eyes shut tightly against the sensation and then open slowly, whimpering while bends over him.
“Shh, don’t worry, baby, go back to sleep, alpha’s gonna take care of you” he says, kissing Suguru’s cheek and his thumb on his lips. And he starts purring, instinctively, and feels Suguru relax against the sheets even though he probably realizes something is wrong. He can’t help it, though, omegas are so hardwired to trust alphas, and he’s Suguru’s just the same, he melts into the pillows when Satoru starts purring and sighs softly.
He bends over him and leans his weight over Suguru. Buries his face in his hair and inhales him.
“Satoru? Satoru, what…? Ah, aaaah -”
He turns Suguru’s face towards him and presses their mouth together, shoves his tongue in his mouth and slams into him hard, finally bottoming out inside him, all the way in. It’s bliss. He just lets himself enjoy it for a second, the feeling of Suguru’s pussy stretching out for his cock, big and thick and girthy as it is. He knows he’s big, bigger than the regular alpha, and he feels how Suguru’s insides have to stretch to accommodate him, feels how the head of his cock is touching Suguru’s cervix.
Suguru puts his hands on Satoru’s shoulders and tries to push him off, but he’s not able to. He pulls away from the kiss and presses a palms against Suguru’s throat, pressing down against his collar and pinning him down while he struggles. His pussy clenches around Satoru’s cock, but his eyes are wide and his eyebrows raised, like he doesn’t want it, like Suguru’s conscious self is fighting against against what his body knows he wants.
Satoru feels him getting wetter and wetter.
“Stop, stop, stop, get off of me, stop, Satoru, you can’t .”
“Baby, come on, don’t fight it,” he says, and starts rolling his hips instead of thrusting, does that movement all the omegas he’s ever been with loved, grinds the root of his cock against Suguru’s clit, “It’s so much better if you let Alpha take care of you,” his voice is raw and rumbling, on the edge of animalistic.
“Satoru, this isn’t you, this isn’t you, why are you acting like this, stop, it’s too much, it’s… Ah .”
Suguru claws at his back and arches off the bed, Satoru feels the way he’s spasming and clenching and pulsing, his pussy cumming around Satoru’s cock and soaking it in slick. And the fire in his turns into a blaze at that, he’s so turned on, he’s so desperate for his Suguru.
He can't bite his throat but he can bite his shoulder, and while Suguru’s still riding the orgasmic high that Satoru caused inside him, he leans down and sinks his fangs into the meat of his shoulder. Suguru yells and bucks against him, Satoru grabs his thigh and digs into his flesh and feels how his legs shake, feels how his pussy just keeps clenching and spasming because omegas love to be bitten, they love it, Suguru loves it too. Alphas in rut have hormones in their saliva, and biting omegas gives them a little euphoric high. It triggers another orgasm in Suguru just as he’s coming down from the first one. Makes him sobs and shake and tear up.
“Satoru, Satoru, stop biting, stop, I’ll - “
But the protests are so, so hollow because he feels the way Suguru throbs for him, feels how wet he is, how his heart beats, how his back arched in pleasure. Satoru’s knot starts swelling as he pounds into him hard, hard enough that the bed rattles and bangs against the wall. He unclenches his jaw from Suguru’s flesh and picks another spot to bite, right into his peck, above his nipple, bites and feels how he breaks the skin and how Suguru shakes everywhere, fresh wave of slickness between them and helpless against the pleasure.
There’s nothing alphas want more than to please their omegas. Their biologies are created to please, it drives all their instincts to make their mates cum. Keep them satisfied and glowy and pump them full of cum, breed them, make healthy babies. He feels Suguru shaking with the force of his orgasms and that’s the only thing his brain registers, Mate Happy, Mate Satisfied, that’s it. The smell of Suguru’s completion and Satoru’s mouth waters, drools all over him, licking the bite marks on Suguru’s chest and biting again.
Suguru keeps trying to struggle but Satoru grabs his wrist and pins it down on the bed as his rhythm goes all over the place. His knot is almost fully swollen by now and he’s trying desperately to fuck it inside Suguru, but he’s just too tight. It doesn’t fit. He growls and snarls, desperately trying to force it in despite the sting of it.
“Satoru - Alpha - ”
God, that sounds so hot it makes him groan,
“Alpha, it hurts ,”
He grabs his knot and tries to squeeze it to make it smaller, and shoves it in like that, and it pinches , like Suguru’s cunt is too tight, feels like he can’t even breath, so tight. He cums inside him, his cock emptying inside, throbbing with each release. And as soon as he starts cumming inside him, Suguru’s body instantly relaxes, goes all soft around him as he leans back into the pillow. He moans and sighs, eyelashes fluttering and eyes rolling back.
He’s heard about this before, but never seen it up close. They say omegas get all cum-drunk sometimes when you breed them, they get all sleepy and mellow and sated and Suguru’s like that, all breathy sighs. He looks like he’s having trouble keeping his eyes open, and Satoru thinks that’s the hottest thing ever.
“Suguru, Suguru, Suguru,” he bends over him and starts licking him, wherever he can reach. When Suguru whimpers in protest, Satoru presses his thumb between his teeth and pries his lips open, spits into his mouth and bites his lip as his hips continue to rut against him. He can’t fuck his knot into Suguru, but he can grind against him, rub his pelvic bone against Suguru’s clit from the outside while his knot binds them together.
“Alpha, please, I - I can’t, I’m so full, I’m so…” but he doesn’t want to listen, and he forces Suguru to cum again, and again, until he can’t talk anymore and his mouth is drooling, and space between them constantly dripping wet and soaking into the mattress.
Suguru passes out before his knot deflates, and he’s so turned out by him still. When he pulls out of Suguru’s cunt, his semen starts dripping out and he can’t have that, so he just pushes back in, lazily fucking into his exhausted omega until he sob.
When Suguru wakes up again, he’s sobbing and there’s tears running down his face, and Satoru gathers him in his arms and shushes him, kisses him. Suguru alternates between trying to shove him away, beating his fists against Satoru’s chest and clinging to him. It’s normal for omegas to be emotional after they get fucked and knotted.
“Why did you do that, why did you have to do that, I would have let you do it you just asked me for it, Satoru ,”
“Suguru, what are you talking about it, baby, come here, stop struggling so much,” he grabs Suguru by his cheek and holds his head in place, he licks the tears off his face, the drool off his chin and starts kissing down his body.
His head is all full of Suguru his mate, of waiting to fuck him and breed him and soon enough he’s thinking about knotting him again. He makes his way down Suguru’s body, biting and licking and spitting, fingers inside his cunt pumping in and out.
“Alpha, please stop biting me, please stop biting, I’ll go into heat if you don’t stop biting me,”
He growls at the thought of that. If Suguru goes into heat, Satoru’s gonna take care of him. He’ll keep him knotted on his cock and full of cum. He’ll protect him. He’ll feed him. He’ll keep him safe and secure and no one’s ever going to touch him unless Satoru permits it, Suguru’s going to be his, his, his, his .
Satoru turns him around and presses his face in the pillows, mounts his face down and ass up like they’re meant to. Keeps a hand on the back of Suguru’s neck and one between his shoulder blades and runs his hand up and down Suguru’s back. He drives into him forcefully and the sound of them them fucking just has it’s own beautiful cadance. The squelching sounds, the way Suguru’s greedy hole sucks him in wantonly, his own grunting and growling and Suguru’s soft moans and cries.
He has to bend down and bite him again and again, into his shoulders, the back of his neck, down his back. So hot. Licks the sweat of Suguru’s back and rubs his spit into his skin. Satoru feels like an animal. Something feral and primal.
He knots Suguru again and this time it’s better, a little easier. Still hurts, though, like his knot is too big, too thick. Suguru’s cunt squirts slick when he knots him, and pulsating wave of cum he shoots inside Suguru is accompanied by a new wave of slick running down his thighs. The smell of it is so hot, it makes him to crazy, he thinks they’re the sexiest thing to ever exist.
Satoru presses his chest against Suguru’s back, both of them sweaty and sticky and a little gross, but the mess is rewarding. It feels amazing, the way he can just do whatever he wants to Suguru.
He maneuvers them on their sides and embraces Suguru from behind. He presses his nose against the back of his ear and starts purring, content with his knot snug inside him, arms around Suguru’s middle, fangs biting and chewing on the tender skin of his neck.
Suguru’s moaning and whimpering softly with each bite. His face is all tears, splotchy red, and his mouth drooling and his eyes hazy and unfocused. He’s babbling something, but Satoru can’t focus on words, his head is too full of pheromones. Instead, he shoves his fingers in Suguru’s mouth and lets him suck on them like he licks the tears from his cheeks. He falls asleep like that, with his knot inside Suguru’s cunt and his finger in his mouth.
Suguru doesn’t fall asleep, not exactly. He drifts in and out of it, his mind is all sluggish and slow, feeling all sorts of emotions. Betrayal and hurt and disbelief. Satoru’s knot deflates and Suguru pull away from him, winching when he feels himself leaking semen. And already, with all the bites and spits and cum, he can feel himself edging closer and closer to a full blown heat.
He should go wash all of it off, but when he tries to get away, Satoru’s arms instinctively pull him back, the possessive single mindedness of an Alpha in a rut. Suguru tries to push him away but can’t. And Suguru knows this isn’t supposed to happen, and it’s useless to try to reason with an alpha in a rut, especially when their pheromones smell as strong as Satoru’s.
But this isn’t something that should have happened at all.
Satoru growls in his sleep and pulls him close, and Suguru can feel his cock hard against his ass again. He tries to kick his feet back. Satoru’s eyes open and he looks at Suguru with the same feral sort of hunger that mutts off the street feel for hunks of stakes, the same ferocious, ravenous stare.
“Satoru, don’t ,” it’s so useless to try to reason with him, “ Satoru !”
Satoru doesn’t even register him, he nuzzles Suguru’s throat and starts groping him, big hands on his chest and thighs, spreading his legs open from behind.
“Satoru, stop ,” he tries again, but there’s no use, and as much as he struggles, rut makes Satoru stronger and the pheromones make Suguru hazy and uncoordinated.
Suguru feels him positioning the head of his cock at his entrance and pushing inside. Satoru thrust into him completely at once, and it hurts . He’s too big and too rough and goes too fast, like he’s trying to punch through Suguru’s womb and get him pregnant. Instinct is probably telling him to do that just, Suguru knows, and if he struggles too much against it, he'll only make it worse, but he doesn’t want it like this. Not like this .
“ Alpha - ”
God, that makes Satoru purr against his back as he fucks into him, puts a hand on his throat and tries to bite through the omega collar Suguru’s wearing. If Satoru would bite him now, there’s a high chance the mating mark would stick.
He’s very fucking wet because his body reacts to it, he’s an omega that’s all bitten up by an alpha in rut, his body wants to get him into heat as soon as possible, wants to trigger a new fertility cycle. Every time Satoru thrust into him, Suguru has to bite his lip to stop himself from crying out, mortified at the wet, sucking sound his cunt makes when Satoru rams into him.
Fuck Satoru. Fuck him .
Satoru knots him again and it triggers another orgasm that leaves him shaking and he really, really hates himself for it. Hates Satoru too. Hates his body for betraying him like that, over and over. He refuses to sniffle and just stares right ahead, straight into the wall, trying to disassociate himself from the sensations in his body, the weird chemicals in his system that tell him this is exactly where he’s supposed to be.
There’s something so breath-takingly unfair about being an omega, because the second they get knotted, their brains get all cloudy. You fill them up and they start gagging for more, but it’s just biology, doesn’t mean they’re actually into it. Heats getting triggered if they’re bitten too much, hormones reacting to alpha ruts.
And the fucked up part is that he really liked Satoru. He fantasized about Satoru fucking him, too. He would have fucking let him if only he fucking asked. If he didn’t knot him raw like that. If he’s been gentler, because no one had ever….he’d never…
Doesn’t matter.
Dogs are dogs, and they can’t be fucking reasoned with.