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Shouto keeps whining so loud Katsuki can barely make out the bed creaking.
He takes cock like a dream.
He keeps begging for it, even while he curves his back and meets Katsuki halfway like he’ll wither up and die if he doesn’t get it as deep as it can reach.
Katsuki feels it every single time he nudges Shouto’s cervix. He’ll hit this soft, plush bit of resistance, almost like it wants to yield and open up for him, and Shouto will keen all high and hide his face into the pillow like it does anything to hide how much slick drips down his thighs.
There’s a wet spot on the bed.
And there’s Shouto’s hand, between his thighs, rubbing his puffy little clit like he wants to drench them even worse.
“Katsuki,” he whines. “I can’t take it anymore, I’m so full.”
“Then stop touching yourself, you brat,” Katsuki huffs. “So greedy.”
“Can’t,” Shouto whines. “I wanna come. I like it. I like—I like it when it hurts a little.”
“Yeah?” Katsuki asks, nails digging into Shouto’s hip. “What if I put it in deeper, huh? Think you’d stretch? Think you’d fit it, princess?”
“Mm,” Shouto whines. “I’d try my best for you.”
Katsuki laughs. “And why’s that?”
“Because you’re my favorite,” Shouto says. “Because I like you the best.”
Katsuki nips at his earlobe. “Yeah?” he asks. “You don’t like other alphas?”
“Nuh uh,” Shouto whines. “Only my Katsuki.”
And that’s—
Well, that’s definitely new.
They’ve been fucking for a while, sure, but Katsuki figured it was just that. Fucking. Him magnanimously taking the time to scratch Shouto’s itches because he says please all sweet while batting those long eyelashes of his, and sometimes he’ll even say you first and open his mouth wide before he taps a finger to the center of his tongue like Katsuki needs goddamn guidelines for that bit.
So.
Katsuki doesn’t mind having his hands full of Shouto, but he didn’t know.
At least—
He didn’t know he wasn’t just hoping?
“Fuck,” he says, and then he’s fucking into him again, harder than the last time, and, suddenly, it’s—
It’s warm.
It’s too warm.
It’s too tight and too wet and too warm, and Shouto lets out this soft little oh, and then he goes and squirts all over Katsuki’s knot just as it settles into place, and Katsuki realizes he’s not snug against Shouto’s cervix like usual.
No, because he’s in deeper.
“Fuck,” he says. “Fuck, baby, look at you. Took me in so deep. I just came in your womb, Shou.”
“Mean,” Shouto whines. “You, ah, you feel even bigger in there. That’s mean, alpha.”
Alpha.
He doesn’t call Katsuki that either, if he can help it.
“What’s wrong?” Katsuki asks. “Don’t wanna give me pups? Don’t wanna stay home and be a good little wife for me? I’ll eat you out all you want. You don’t even have to learn how to make dinner. Just gotta—just gotta fuckin’ sit there and look pretty, princess, yeah?”
“I hear,” Shouto gasps, Katsuki’s teeth nipping at the back of his neck, “that labor involves more than sitting there and looking pretty.”
Katsuki wants to bite him so bad his teeth itch.
He could do it. It wouldn’t take unless Shouto wants it. And he’d pout about Katsuki not asking first, probably, because he’s a spoiled little brat, because Katsuki made damn sure of that for him, and then Katsuki would need a mildly catastrophic amount of cold soba to make proper amends.
But it would be worth it.
Of course it would be, if he gets Shouto out of it.
“I want it,” Katsuki admits. “I want kids running around. A whole bunch of ‘em. I want them with you, princess.”
He brings a hand between Shouto’s thighs to rub his clit, and Shouto lets out a sharper gasp.
“How about it?” Katsuki asks. “I get to fuck you as much as I want? You stay home and watch all your granny baking shows? Read those books with the shirtless alphas on the cover?”
“What about work?”
“Quit,” Katsuki says, like it’s that easy. “I’ll fill out the form for you, I know you don’t like paperwork.”
Shouto laughs. “The old man would have an aneurysm,” he points out. “And then he’d survive it just to hunt you down.”
“Even better,” Katsuki says. “And don’t talk about your dad while I’m making you come, princess, it’s real rude.”
“You’ve been making me come since my heat hit,” Shouto says. “You didn’t even stop so I could eat.”
“Hey,” Katsuki huffs. “You complaining here? You’re the one who wanted to do it sitting on my knot.”
“Nuh uh,” Shouto says, finally lifting his head properly off the pillow. “I’ve got the best alpha. His knot fills me up so nice. Stretches me so wide. Plugs up my pussy just right. I think I might be in love, you know?”
Shouto says love, and Katsuki’s teeth break skin, just like that.
It’s stupid.
He’s probably just being a brat. Making a dumb joke he thinks he can get away with because he’s pretty and perfect and just soft enough to keep coming home to, no matter what.
(And he is, but that’s not the point.)
Katsuki slumps into the soft curve of Shouto’s body, and Shouto says, “Oh, thank you,” like Katsuki giving him a mating bite is just a regular Tuesday.
Is it? Has he been wanting it enough that the sharp prick isn’t a surprise as much as a reward for all this effort he’s put himself through spreading his thighs and letting Katsuki knot him through every single heat he’s had since he presented, just a few months before his eighteenth birthday?
Katsuki would have mated him back then, to be fair.
If he’d asked.
If he’d said please like he does now, Katsuki wouldn’t have been strong enough at barely eighteen and barely a hero. He wouldn’t have been able to hold himself back. He’d just have sunk his teeth in and saved them both a good six years of dancing around it.
“Oi,” he says now. “You gonna look at me, you brat?”
Shouto huffs. “Don’t tug,” he says. “Your stupid knot is too big.”
“C’mon,” Katsuki says, tipping his chin. “Look at me, princess.”
Shouto smiles at him. “That’s better,” he says, pleased. “That’s a good alpha.”
“Spoiled brat,” Katsuki huffs.
And then Shouto decides the best course of action is to lean up and press his lips to Katsuki’s cheek. “I want to do this a lot,” he says. “But I always worry you’ll frown. And then you’ll get wrinkles on your handsome face.”
Well, that’s fucking stupid.
“You can do whatever you want to me,” Katsuki says. “Only fair. You’re mine now.”
Shouto’s mouth purses. “But I wasn’t before?” he asks. “How is that fair then?”
“Guess it isn’t,” Katsuki admits. “My fault. Should have told you from the start. Figured putting my knot in you would be enough, princess.”
“How was I supposed to know that wasn’t, like, a friendly favor?” Shouto asks, eyebrows furrowed.
“Well,” Katsuki hisses. “We’re not friends, for one, you damn brat.”
And—
“Right,” Shouto says, all soft. “We’re mated now, aren’t we?”
Because Katsuki went and bit him, yeah. Only took about six years, give or take.
“So?” he says. “Now what? Pups next?”
Shouto reaches for the spare pillow just to throw it at him. “Nuh uh,” he says. “Not before I tell people we’re mated. They’ll call me a slut, Katsuki. The tabloids will have headlines for months.”
“Princess,” Katsuki says incredulously. “It’s been six years.”
“But they don’t know that,” Shouto pouts. “Besides, we should date. We haven’t dated.”
Katsuki blinks like an idiot. He’s got his knot snug in Shouto, and Shouto’s talking about how they haven’t dated?
“You haven’t paid for a single meal since second year,” Katsuki protests. “I know damn well. My old hag started asking where I went and found an omega with such expensive taste three weeks in.”
“Well,” Shouto says, cupping Katsuki’s cheek with one delicate hand. “You were just being a good alpha, obviously.”
“Obviously?” Katsuki repeats, arching an eyebrow. “What do I get, then?”
Shouto considers it. “What do you want?” he asks. “A kiss?”
It’s silly. They’ve kissed plenty.
It’s not enough yet, obviously, but. You know.
“We’ll start there,” Katsuki says. “Okay?”
“Okay,” Shouto says. “But no complaining about making me cold soba from scratch for a week straight if the tabloids call me a slut. Is that alright?”
Well—
That’s a pretty good deal.
“Anything you want,” Katsuki says. “You’re mine now. I take care of what’s mine.”
(And he’s been taking care of Shouto for a while already, so. It’s not hard, or anything.)