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Deku is an itch that Katsuki can’t quite reach, can’t quite scratch, can’t quite rip out of his skin. He’s an annoying fly that’s landed on his ear, his buzzing louder the closer he gets, making shivers dance down Katsuki’s back as he flinches before swatting at it.
Deku is a hindrance, an obsessive freak whose green eyes seem to track his every movement, always even darker every time Katsuki meets them. It’s as if they can hear the very heartbeat in Katsuki’s chest, see the way it pumps Katsuki’s blood, over and over and over again.
“Leave me the fuck alone,” Katsuki bites out, Deku stalking him like always, keeping a careful distance behind him, but not so far that he can’t hear every quick insult Katsuki mutters under his breath.
“I go home this way, too, Kacchan,” is all Deku replies, voice painfully even. He’s stopped walking because Katsuki’s stopped walking. Katsuki grits his teeth, fists his own shirt, bunching it up between his fingers, and he takes a deep breath. Then, he turns around, taking short steps towards Deku, who takes a few steps back in automatic defense.
Deku’s too late, though. Katsuki’s already shoving him forward, watching as Deku falls to the ground, wincing at the impact.
“You don’t have to fucking follow me. Just walk around me. Just walk somewhere else. Leave earlier. Leave later, I don’t give a fuck. I know you do this shit on purpose, every single day, you do this shit. Just leave me alone, Deku.” Katsuki gets even closer to him, squatting so he’s closer to Deku’s level. Deku doesn’t try to get up—he’s learned his lesson from trying that before—but he doesn’t shrink away either. Instead, he just stares at Katsuki, mouth parted just slightly, and Katsuki swallows back his disgust. “You’re so fucking gross. I could spit on you and you’d probably like it, hmm?”
“You can.”
The response is so immediate that Katsuki blinks. Frowns. “What?”
“You can spit on me.”
And—it should be horrible, how much Katsuki wants, his gut twisting with anticipation. Deku is such a freak. Does he think he’s better than Katsuki, for not standing down, for not pulling back in fear?
Sneering, Katsuki moves even closer, pressing one hand to Deku’s neck, a clear warning for Deku not to move a single inch or he’ll go home with burns. Deku’s mouth opens more, just a bit, so miniscule Katsuki wouldn’t have noticed if he wasn’t so fucking close to the nerd.
“You’re so nasty,” Katsuki scoffs, but his gaze is captured on the way drool seems to pool in Deku’s mouth, slipping out and down his chin, like a fucking baby. “Look at you, fucking drooling on yourself. Is this why you’re so obsessed with me? You want me, Deku?”
Deku swallows, blinks two times, and then he’s pressing forward, Katsuki’s hand curling more tightly around his neck. “I want you in every way, Kacchan.”
Katsuki spits on him. Right into his open mouth and Deku’s eyes go hazy as soon as he realizes, a whine escaping his lips, his body falling back on his arms, and Katsuki should just go home, he shouldn’t bother with an annoying fucking fly, but he doesn’t want to just swat at it anymore. He wants to capture it, put it in a jar, shake it around and hear its body slam against the walls, watch as the fly’s wings are so injured it falls to the ground, unable to do anything except wait to see what Katsuki does next.
He leans over so he’s hovering right above Deku and with a wild smirk, he spits on him again. He purposefully misses Deku’s mouth, spitting right on his nose and eyes, and Deku gapes up at him, one of his hands coming up to swipe at the fluid. Katsuki never knows what to expect from Deku, not really, and he knows he shouldn’t be surprised by anything the freak does, but. But, Deku’s not putting his fingers in his own mouth, lapping at Katsuki’s spit like some dog. No, instead, Deku’s raising his hand and pressing at Katsuki’s mouth, his fingertip resting in between Katsuki’s lips before pressing insistently inside.
It's so sudden that Katsuki lets him, his eyes flickering shut as he feels Deku’s finger go even deeper, and then another finger is joining, and Katsuki can taste Deku, can feel as Deku grabs ahold of his tongue, gently rubbing one of his fingers on the roof of his mouth.
Katsuki moans loud and it’s that sound that brings him back to reality, eyes snapping open as he forces out Deku’s fingers, spitting again on the nerd, right in the middle of his stupid fucking face. Deku has to wipe at his eyes this time, but Katsuki doesn’t give a shit, already standing up straight and stalking off.
It’s a weird walk home after that, an awful, sickly feeling settling inside his body, and when he looks behind him, he doesn’t know how to fully understand the emptiness that seems to permeate. Deku isn’t following him, and of course, he knew that. He’s known it since he left.
Katsuki turns back around, gnawing at his own lips, and he bites his own tongue so hard it starts to bleed. Would Deku want a taste of that, too? Would he want anything Katsuki wanted to give to him? To take from him?
He doesn’t turn back around to see if Deku is following after that, but the emptiness grows ever larger. It feels awful. Feels like—
Like his wings have been cut off. Like he’s just some fucking fly in some stupid glass jar, large green eyes watching him silently from the outside, not moving to do anything, not letting him out but not forcing him to stay.
When he gets home that day, he finally lets his eyes shut again.
He can still taste Deku.
Just another repulsive itch Katsuki can’t reach.