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Sheiths can have a part 2, as a treat.

ABO sheith, nsfw, smidge of violence, possessive behavior, some afab language
Shiro would be lying to say he doesn’t smell Keith. There’s not a single alpha around who can’t. Shiro knows why, knows that some omegas are just /like that/, they have more slick because they’re... more prepared for a knot. A big knot.

A knot like—

No.
Shiro is not like them. He’s not a knothead trying to get his face between Keith’s legs. Keith is his best friend, his wonderful, amazing, talented as hell best friend who just /happens/ to smell like a goddamn buffet.

His best friend who sometimes
will bend over in the gym and give all the alphas a peek as just how /wet/ he is because it has left a stain on his shorts.

Keith doesn’t do it on purpose. In all likelihood he probably even wears a plug to avoid such a thing. He’s just.. that wet.

Fuck.
But Shiro’s not like those knot heads. He has self control and absolute respect for Keith. He would never act like those fools.

Except then, one day he catches a cadet elbowing his buddies and making obvious commentary about Keith. Keith’s who’s obliviously doing stretches.
The cadet goes over, and before Shiro can even think to shout out, the man puts his hand on Keith’s ass, sliding down toward—

Shiro sees red.
He’s there in a flash, but Keith’s already taken the cadets hand and bent it back at an impossibly painful angle.

Shiro doesn’t care, hardly processes it. He tugs the man out of Keith’s clutches and decks him.

“Don’t fucking touch him,” he snarls.

The cadet, miraculously
doesn’t go down, but whirls around and, knot-crazy, swings at Shiro.

It’s a little clumsy but the man gets him just over the eye and there’s distant pain, likely blood, but Shiro only feels the shock at the audacity of this cadet.

Then Keith is there, spitting
fire like an angry cat and the cadets buddies are pulling him away before Keith truly wrecks him.

In the end they’re left alone. Shiro’s still standing there in shock at it all.

“You’re bleeding,” Keith says finally, “cmon.” Shiro can’t speak, but he lets himself get lead away
They end up in the gym medical room. There’s a small bed for addressing minor injuries, Keith sits him down on there.

“You didn’t have to do that,” Keith says getting out the supplies.

“He touched you,” shiro says.

There’s a sigh, but Shiro’s sure it’s fond. Then Keith
is waving him to scoot back and plopping down right on Shiro’s lap. “Hold still,” he orders, taking a swab to Shiro’s bleeding brow.

Shiro wouldn’t move for all the gold in the world. He barely even breathes.

Still Keith’s scent /blankets/ the small space. Impossible not to.
Keith tends to him carefully, wiping away the blood, disinfecting, and then holding pressure to stop the bleeding.

Every time he shuffles on Shiro’s lap, Shiro feels a quaking, dangerous thing inside him grow.

“They can’t touch you,” he says finally when Keith is laying down
a butterfly bandage on his brow.

Keith smirks, “oh yeah tough guy?”

He goes to get up then, but the smell of him swells and Shiro can only think about how Keith has surely slicked through and on Shiro’s pants by now. Shiro’s hands lock over his hips, reseating him.
This is bad. It’s bad bad bad. Shiro’s brain is shouting at him but he must be a little knot-crazy too because the alpha in him is /louder/. It’s saying he has a beautiful omega on his lap absolutely ripe for the taking.

Wet enough just to slide down a knot, even one as
big as Shiro’s. He’s be perfect, so perfect, bouncing on Shiro’s cock.

Fuck.

No!

“Shiro?”
“They can’t touch,” he says, stuck on a loop. He can’t help it. Keith smells fucking amazing and he fits so perfect on Shiro’s lap and—

Shiro needs to get it together. He needs to think rationally, let go of Keith and—

And then Keith grinds forward, right over where his
cock is throbbing.

Shiro growls, hands tightening.

“So they can’t touch, but you can?” Keiths tone is cheeky, but there’s a breathless quality to it. His cheeks are pink.

Everything is spiraling out of Shiro’s control. Everything he thought he knew has dissolved beneath
this playful taunt from Keith.

“Yes,” shiro says, meeting his eyes and grinding him on his lap. “You’re mine.”

It’s a gamble to say the words, forbidden even in his own mind, but he feels hot and wild and awash in Keith’s mesmerizing scent.

“Good,” Keith says.
The clothes practically dissolve between them and their furious tugging. Shiro falls back into the bed and Keith follows and then suddenly they’re kissing, smoldering things more tongue than anything else.

Shiro gets those tiny fucking shorts off, feeling the resistance
as they come unstuck from Keith’s cunt. If he had any rational thoughts left, they desert him at that.

“Fuck, I want to see,” shiro fumbles between kisses, rolling them over clumsy to get Keith in the sheets.

Keith makes a sound of inquiry, but Shiro’s already sliding
down his slender body, brain stuck on getting his eyes and hands and /mouth/ on that which has been torturing him so long.

And what a prize it is. He spreads Keith and suddenly his gorgeous pussy is on full display, absolutely sopping. The smell hits him like a train car.
He dives in, lapping and sucking and moaning at the sweet taste of Keith on his tongue. It’s like nothing else and he already feels addicted, gluttonous. Keith’s legs come up around his head as he cries out, but it only eggs Shiro on. He wants Keith to come, wants
to taste his pleasure as it pulses fresh only Shiro’s tongue.

It doesn’t take long with Shiro’s diligence. Keith nearly screams his orgasm, and wetness just /gushes/. He keeps at it, drawing out the orgasm, basking in the rightness of the smell and heat and taste.
“Alpha!” Keith mewls then, tugging urgently at his hair. “Alpha please!”

It hardly needs saying because Shiro is then moving up Keith’s body, his cock almost painful, every alpha instinct in him turned toward knot, knot, knot.

Keith’s legs widen in welcome.
Shiro’s pushing in before he’s even realized it. The feeling of it shivers through his whole body and he bends over Keith, biting his face against his neck. “Keith,” he moans, pushing in.

It’s so slick, like a fucking dream. Keith is small and tight but this is what his body
is made for, it’s what all that slick is /for/.

“Mine,” he growls, pushing in and in and listening to Keith’s staccato sounds as he buries himself up to the knot.

“Oh fuck, fuck, you’re— stars that’s big. And not even the knot, /Christ/.”

Shiro can barely make sense
of the words, his brain is a fog of pleasure urging him to /take/.

So he does. He pulls back and the fucks into the omega, nibbling at Keith’s throat as his hole quivers and clutches around him.

There’s no way in hell he lasts, but with the rising pitch of Keith’s cries
as he starts to fuck him faster, neither will his omega. So Shiro kisses and sucks and fucks him, overwhelmed by his senses, in awe of his omega.

“Please!” The omega cries as the bed rattles and the smell of his pussy becomes deliciously sufffocating in the room.
Shiro knows what he wants, and on the next thrust in he gives it— pushing harder so his knot will start to breach.

The pleasure is indescribable. So, so, tight, Shiro nearly bites his tongue off as he sinks into that tight cunt, his omega screams as he’s breached
and then he’s fluttering on Shiro’s knot and coming. “Yours,” he cries, “Alpha!”

Shiro bites down on the omegas tender throat, fucking his pussy deep, grunting and garbling sounds and language as he starts to come.

His knot throbs, dumping come into his omega over and over.
It’s filthy and satisfying and Shiro nuzzles and licks at the bite mark, drowning in the pleasure as he comes and comes.

Keith croons softly, rubbing his back, but Shiro can do nothing but stay in his pleasure, letting it slowly, slowly, pour into his omega.
It’s a long knotting, Shiro knows it on the fuzzy edges of his brain. A long knotting with a perfectly primed omega, one that was ready to milk him for all that he’s worth.

It’s perfect. Amazing. Transcendent. It leaves him utterly dazed.
When he eventually is able to pull out, Keith is looking up at him with a soft smile.

“Feel better there Alpha?”

Shiro blinks at him, dumbly.

Keith pets his hair. “Take your time. I’m yours, you’re mine. Okay?”

Shiro feels leagues away from his sober, responsible self but
he nods. He trusts keith, Keith is his best friend—

He looks down at the very obvious bite mark he left on Keith’s throat. Keith is touching it w a preening sort of pride.

Keith is his mate.

He smiles with dawning awe. “Okay.”

Keith pulls him in for a tender kiss.

/END
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