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Izuku is so hungry for kisses. Once he gets a taste he turns so helplessly greedy, needy, like his mouth feels empty without the movement of a kiss filling it, going dizzy and lightheaded from not coming up for air because he needs more, more. He trembles and pants and and hiccups on a skipped breath and leans in over and over and Katsuki pulls back, and laughs a hushed little thing, tells him to remember to breathe— but he can’t, he can’t think, he needs kisses, he needs to be kissing Kacchan.
And Katsuki always, always indulges him, indulging himself in the process, just as greedy if a bit more clearheaded about it usually, because while Izuku finally gets out of his own head when he’s with his Kacchan like this, this is where Katsuki achieves clarity. He always gives Izuku what he wants, is begging for, then takes a little bit more. Takes the gentle presses that leave him breathless and wanting, gives the deep licks into his mouth that leave him drooling, bites into him like a peach and smiles into it when Izuku whines.
Katsuki learns to be careful, eventually— he can’t pull Izuku in by the waist and kiss him quick in public, press him against an alley wall for a moment where the world narrows to everywhere their bodies meet and they taste each other’s want, because Izuku’s body will go limp while his grip grows strong and he’ll cling and he won’t let Katsuki go. He’ll fill his fists with whatever Katsuki’s wearing and drag him impossibly closer, try to keep him, unconsciously angle himself up and lean in like he need’s Katsuki’s mouth on him to breathe. and Katsuki will need to go, have somewhere to be, can’t spend the next hour making out with Izuku the way his boyfriend is radiating that he needs right now.
Hell, Deku has somewhere he needs to be too, half the time, but he seems to forget this the way he forgets the need to catch his breath, gluing himself to Katsuki like he was waiting for it, like his brain shut off and rewired to this single objective the second their lips touched.
So no, no more kisses hello or goodbye in the hallways or outside their building, because Izuku starts drinking him in like he’s been parched for days, and Katsuki is helpless to the way he sighs like he’s been saved. The way he presses closer like he wants to eat him, to be eaten, taken whole or in pieces or any way Katsuki would have him. They’ve been late too many times. Katsuki reserves PDA for when they have the time, or some extra’s been eyeing Izuku a bit too closely for his liking, or when he’s too in love with him to give a fuck about propriety.
They prefer to kiss in private, when they can both fall into it the way they want to, bask in that special glow of having time, and having it together. Falling and catching and trust. Where Katsuki can indulge in the damp plushness of Izuku’s lips and his willing open mouth and Izuku can lose his mind in feeding the part of himself that’s always starved.
And maybe Katsuki encourages it, a little. A lot. Maybe he cups the back of Izuku’s head, slides a hand into his hair, just the way he knows he likes, the way that makes him go a little cross-eyed. Tilts his head a little to kiss him deeper, to kiss into him the way he knows drives Izuku a little crazy. Makes him glaze-eyed and wordless, which is fine, because his mouth is occupied anyway. Katsuki doesn’t exactly make it easy for Izuku to pull away, but that’s only fair, since Izuku’s making it near impossible to let go in the first place, with his stubborn clinging and soft needy noises and perfect, sweet mouth.