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Katsuki finds Shouto standing in front of the refrigerator with an ice cube tray in one hand, icing his mouth with the other.
“What the fuck?” he says. And then, when it hits him, “Can’t your quirk do that anyway?”
And—
It’s frankly a little terrifying, when the fridge door closes and a chipmunk-cheeked half ‘n half glares at Katsuki with all his might and says, “You think I want to use my quirk right now?” like Katsuki’s a whole, entire idiot.
It’s possible that he is.
He remembers Dunce Face saying something about not poking a pouting omega, and suddenly it all clicks.
Right. Half ‘n half presented last week. Of course his teeth hurt. Omega teeth aren’t even meant to bite or claim, not like that. Not like alpha teeth are. But they still grow. And if it hurts anything like it hurt for Katsuki when his alpha teeth came in, then halfie’s in a hell of a lot of pain right now.
“That bad, huh?” Katsuki says. “Your little teeth hurt, halfie?”
He might get punched for it, if the way candy cane princess’s eyebrows furrow is any indication, but he’s never been able to help it around him. Not even once. It’s like the urge to tug on Shouto’s pigtails is just basic alpha biology, or something.
Then again, it’s also entirely possible that Katsuki’s just an idiot.
“Hurts,” Shouto whines. “It’s like I want to... gnaw on something?”
“Yeah,” Katsuki says. “After my first rut, I didn’t have any pillows left. Tore them all to shreds over how badly I just wanted to bite something, you know?”
Shouto’s eyebrows furrow harder. “Isn’t it different?” he asks. “For alphas? You actually have the claiming instinct. This just hurts.” He rubs his puffy cheek. “Hurts a lot, actually.”
“C’mere,” Katsuki says, can’t help it. “We’ll see if we can fix you up, princess.”
He takes a bunch of paper towels, bunches them up, and wets them under the sink on the coldest setting.
Shouto lets out this little huff, but he puts the ice cube tray down on the counter and obediently follows after Katsuki.
“Open wide,” Katsuki says. “Let’s see if this works.”
An equally pouty Shouto now just has a mouthful of wet paper. “Texture’s weird,” he says. “The cool helps, and I like that it’s soft unlike the ice cubes, but—it’s wrong.”
He lets out this pitiful little whine, all omega, all take care of me, spoiled little princess that he is, and Katsuki’s alpha pride refuses to take it lying down.
“Mom and her friends used to say that with helped teething babies,” Katsuki says. “Figured you’re not that far off.”
Shouto steps on his foot. “You’re always so mean to me,” he says. “What did I ever do to you?”
The last bit of self-restraint in Katsuki saves him from saying you sit there and look pretty and I want to bite you everywhere like some giant loser. It’s a near thing, though. Halfie’s just real nice to look at, and it makes Katsuki stupid. He’s slowly coming to accept this undeniable truth.
It doesn’t stop him from doing more stupid things, though.
You know, like gripping halfie’s jaw, fingers digging into his chipmunk cheeks, and saying, “You’re spoiled, sweetheart.”
It’s not true. Not really. Shouto’s good and kind and he deserves little birds helping him get dressed each morning, and, if anything, Katsuki wants to know the stuff he likes just so he can spoil him himself, because all it takes right now is a bowl of cold soba, and he’d really like to raise that bar.
But, to reiterate, pretty, wide-eyed, pouty omegas make him stupid.
“Ow,” Shouto says. “I’m sore, stop doing that.”
He’s holding still, though. He’s not running away. He’s not kneeing Katsuki in the groin so he can flee. No, he’s just standing there like a good little omega, like he’s waiting for his alpha to tell him what to do.
“Open up,” Katsuki says. “Let me take a look.”
And Shouto does, a second time, just because Katsuki told him to, and for a blissful three seconds Katsuki just indulges himself, and pictures that pink little mouth stretched wide for him other ways.
But this isn’t about that. This is about making Shouto feel better. Which Katsuki will figure out even if they have to sit in this kitchen until morning.
“I can’t believe you put wet paper in my mouth,” Shouto says. “It tasted kind of like that time I tried to make soup on my own.”
“Hold still,” Katsuki says. “I’m trying to see.”
Nothing looks too bad, to be fair. Sure, maybe his gums are a little red, but it’s mostly just pointy omega canines too big for that little mouth. It should go away once the itch of his first heat settles.
Still—
Katsuki doesn’t expect Shouto to grip his wrist just to guide Katsuki’s fingers into his mouth.
He feels himself twitch, and Shouto’s red little mouth just sucks him in deeper.
“This is nice,” he says, the words slurred around Katsuki’s fingers in him, “I like this.”
“See?” Katsuki huffs. “Spoiled little princess.”
“You like me,” Shouto says. “You’d probably kiss me if I asked.”
And then pointy omega teeth prick at the skin of Katsuki’s middle finger, and Katsuki’s whole life flashes before his eyes, because he feels how the tip brushes against the back of half ‘n half’s throat, almost like they’re—like they’re doing this on a bed somewhere, dumb fumbling kids trying to figure it out, and Katsuki’s telling halfie to get his fingers wet so he can stretch that little omega pussy out for a knot.
Which—
Well, it’s definitely not what Katsuki should be thinking if he doesn’t want to explain why he’s hard to candy cane princess in the next five minutes or so.
Mercifully, Shouto takes Katsuki’s fingers out of his mouth.
Far less mercifully, the next words he says happen to be, “Can we sit down? It’s awkward like this.”
And then, obviously, Katsuki finds himself on the common room couch with a lapful of omega sucking on his fingers like Katsuki’s his own personal toy.
“What are you?” he huffs. “Giant, spoiled little—”
Shouto pinches his thigh. “Quiet,” he slurs. “’m busy.”
Yeah, and it just so happens that Shouto’s busy is giving Katsuki a great approximation of what he’d look like sucking cock, and halfie is already pretty much sitting on his dick, and Katsuki isn’t small, and no amount of carefully tucking the fabric of his hoodie over his lap is going to save this if Shouto keeps letting out those little whines.
His mouth is wet. Slick with spit. Pink little lips stretched around two of Katsuki’s fingers.
“You know, halfie,” Katsuki says. “If you did this with some other alpha, they might get the wrong idea.”
It makes him bristle just to think about it, though. Shouto warm and wet and open for anyone that’s not Katsuki. Shouto splayed out on someone else’s sheets, needy and willing, when they don’t deserve him. When nobody deserves him. When nobody should even get to look at him without Katsuki’s permission.
“Don’t mind,” Shouto says. “It’s you.”
Which, predictably, doesn’t do Katsuki’s dick any favors. And while that bit of him might not have any objections to Shouto sucking on his fingers and wiggling around on his lap, the rest of him puts up valiant effort and points out that they should probably talk about this.
“Hey,” Katsuki says, tipping Shouto’s chin up. “Princess, look at me.”
“I’m already looking,” Shouto whines. “Mean alpha.”
Katsuki pulls his fingers out of Shouto’s mouth. “You wanna take a knot right here?” he asks. “Because that’s what’s gonna happen if you keep doing that. Gonna end up pushing your panties to the side and slipping it in, halfie. Is that what your little shorts are for? Because you’re too lazy to take your panties off when you play with your pussy?”
His fingers dig into Shouto’s thigh, tug him closer, and then Katsuki is just—
He doesn’t mean to.
He doesn’t mean to, but then he’s grinding into him, into the soft little curve of his body, so warm and so sweet and so Shouto that it makes his teeth itch, that he gets it, right now, that the selfish part of him wants to say it’s probably worse than whatever Shouto’s got going on, because—
Well, because he’s an omega. He gets to just sit there and look pretty and wait for what he wants. Katsuki’s the bastard who has to say it out loud. Because he’s an alpha. And he’s supposed to take care of Shouto if he ever wants to even dream about deserving him.
It’s a damn good thing he’s stubborn, even when he’s scared.
(Because it is a little terrifying, wanting someone and their stupid chipmunk cheeks this much.)
Shouto lets out this soft little ah, nails digging into Katsuki’s collarbones through the fabric of his hoodie, and then his mouth parts a little wider, and he’s the one pushing his body into it, chasing the friction, letting Katsuki’s hands on his hips keep him steady.
“Sensei—sensei is going to be mad if we get the couch dirty,” he says. “We should, ah, go somewhere else.”
“You want a bed?” Katsuki says. “Want me to take my time with you on a nice, soft bed? You gonna forget where it hurts like that, princess? Want me to kiss it better?”
“It’s okay if it’s you,” Shouto says. “You can do it. You can do whatever you want to me.”
Katsuki feels a little dizzy. “You’re gonna kill me,” he says. “I’m gonna die on this damn couch, halfie, and then I’m gonna haunt you.”
“No,” Shouto says, all pouty. “You’re not allowed to haunt me.”
Katsuki’s mouth twitches. He fights the urge to laugh. “And why’s that, princess?”
“Well,” Shouto says, “I’m assuming you can’t put it in if you’re dead.”
It’s that, out of everything, that makes Katsuki snap.
...
Shouto barely weighs a thing, for the record. And he smells so damn sweet that the alpha thing rattling inside Katsuki’s chest starts whispering shit like put pups in him, get him round. Like that’s the most optimal way to get half ‘n half to weigh more than a pile of wet leaves.
God.
“You really are spoiled, you know?” Katsuki huffs.
Shouto bounces a little when Katsuki puts him down on the bed.
“Just for you,” he says, deliberately batting those long eyelashes at him. “I’ve got this feeling you can handle it. Can’t you, Bakugou?”
“Brat,” Katsuki huffs, but it comes out all fond.
Of course it does. It’s Shouto. Pretty princess does all sorts of anatomically improbable shit to his heart.
(And, you know, his dick too, no doubt about it.)
“You gonna let me try, princess?” he asks. “Gonna be a good little omega for me?”
Shouto nods. “Mm,” he says. “I think about it a lot. I want—it has to be you.”
His mouth purses in determination, like Katsuki’s at the top of some list written in pink glitter pen in one of those notebooks he’s always doodling in by the last ten minutes of class.
Katsuki wants to bite him so bad it makes his teeth itch.
...
It turns out, haflie doesn’t complain much about anything hurting once Katsuki gets his mouth on him. Instead, he’s busy tugging on Katsuki’s hair while Katsuki laps at that puffy little cunt, licks Shouto’s slick up straight from his swollen pussy.
“You’re good at this,” he says, almost like he’s surprised. “I didn’t, ah, know if you’d have the patience?”
Like Katsuki’s wrapped a hand around his knot ever since he saw that pretty face for the first time thinking about anything besides what’s between Shouto’s thighs. Brat smelled real sweet even before he presented. And Katsuki’s head was full of mine, mine, mine anyway.
It’s just—
It’s nice, that they fit together like this. That Katsuki gets to take care of him. That Shouto can tug on his sleeve and say please and get whatever he wants.
Obviously he’s gonna make him feel good. Shouto might be spoiled, but he deserves it. And Katsuki wants to keep spoiling him. Forever and ever and whatever comes after. Because Shouto’s his.
It better be Katsuki’s job to make him feel good.
Katsuki nips at the inside of his thigh. “Sweetheart,” he says. “I could do this for the rest of my life.”
It doesn’t take that long, though.
Of course it doesn’t. Half ‘n half is real pliant and sweet under him, and all he needs are a few more swipes of Katsuki’s tongue over his hard little clit before he’s arching off the bed and squirting like a good little omega.
“Oh,” he says, all prim and proper, like he isn’t still warm and twitching. “I didn’t know I could do that.”
Katsuki wants to eat him up.
...
(“So,” Katsuki says. “You gonna let me put something else in your mouth, princess?”
Shouto throws his own pillow at him.
He still pouts about Katsuki snuggling him, though, so.)