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Katsuki’s arms were shaking, knees teetering on the edge of giving out. The only things keeping him upright were his white-knuckled grip on the headboard, and the scarred hands holding him around the waist. Deku was fucking him so deep he could feel it in his goddamn teeth, panting hard, each thrust slapping against his ass and sending him barrelling towards the wall before those hands yanked him back once again. Each stroke just barely grazed his prostate, making his sore, throbbing cock drool onto the sheets under him — but the grip on his hips was so tight that adjusting the angle was impossible.
Touching himself was pointless, too. Every single time he’d tried, Deku had stopped him: easily forcing his hand back onto the headboard and fucking him harder until he was holding on for dear life. All he could do was take it and remember to breathe, while Deku’s thrusts turned unsteady and his grip tightened on Katsuki’s hips until he was groaning.
“Fuck,” Katsuki gasped — choked — feeling Deku pulse and spill inside of him yet again. Cum overflowed to drip down his thighs, into the puddle on the sheets below.
And Katsuki still hadn’t come.
“Hahhh…” Deku lowered his head in between Katsuki’s shoulder blades, dropping a soft kiss that made him jolt and twitch. “Mmm, that was nice, Kacchan. How do you feel?”
Katsuki swayed, his head dropping to hang heavily towards the mattress. He licked dry lips, but no sound came out when he tried to reply.
Deku made a noise of concern in the back of his throat and reached for the bedside table. For a second Katsuki tensed — almost expecting a vibe, a cock ring, nipple clamps, whatever instrument of painful bliss the nerd was planning to unleash today. His body sagged with relief when Deku’s form swam back into focus holding nothing more than a glass of water.
Katsuki really did almost fucking collapse when he tried to take it, but Deku’s arm was there to catch him, quickly supporting his chest and guiding his hand back onto the headboard. Once his grip was secure, the hand came back to lift his chin from below as Deku placed the glass at his lips.
The rush of liquid into his parched mouth was blissful. Deku took it slow, only allowing him small mouthfuls at a time, but the pleasure of it — wetting his tongue, slicking his throat, trickling down to sit cool in his belly — made his body quake.
“That’s it,” Deku murmured, still sat balls-deep in Katsuki’s ass even while he was playing nurse. “Little sips… that’s good, Kacchan.”
As Katsuki drank, he felt himself becoming marginally more sane — or at least, more aware of his surroundings. The tremors hadn’t stopped, rendering his limbs useless, barely able to support his own weight. His ass was tender and sloppy, still leaking cum as it clenched sporadically around Deku’s cock — which wasn’t softening, courtesy of his ridiculous quirk-fueled stamina. And Katsuki’s own poor, neglected dick was still fucking hard, hot and twitching, hanging heavy between his legs.
Finally, Deku took the glass away. “Better?”
Katsuki twisted his head and tried to glare through watery eyes. “Fucking asshole.”
“Mean.” Glass safely back on the table, Deku took hold of Katsuki’s hips and tugged them back. “One more, okay?”
Katsuki spasmed. The thrust glanced off his sweet spot again, sending shockwaves into him and making his cock weep, a long, sticky line of pre connecting him to the bed. He reeled, gripping onto the headboard like his life depended on it. “Shit, ah — Deku, can’t—”
“You can,” Deku soothed, now using his grip on Katsuki’s waist to pull him steadily on and off his dick, barely grazing his hot spot with every stroke. “Come on, don’t you wanna come?”
Fuck, he did. He wanted to — needed to — never needed anything so badly in his life. But his body was shaking with exhaustion, somehow oversensitive and desensitised all at once. Deku had fucked his hole thoroughly open, enough that cum squelched and oozed out even as he worked to pump it back in. Katsuki’s cock was far past the point of painful, throbbing and twitching in time with the rapid, helpless thumps of his heart.
“Don’t you?” Deku paused on the next stroke, halfway in, the head of his dick nudging with delicious, agonising pressure against Katsuki’s swollen prostate.
Katsuki groaned, rocking back onto it with the little movement he could manage, and nodded.
He could hear Deku smile. One hand released his hips and smoothed up the line of his back, lighting up his nerves like a fuse under his sweaty, shivering skin. “Good boy. One more, and then I’ll let you come, okay?”
Katsuki gasped when that hand gripped onto the back of his neck and pulled, yanking him back harder onto the cock stuffing his ass. His arms finally gave way, releasing his grip on the headboard and allowing his chest to slump down onto the bed. He was too wiped out to even turn his head, landing with his face flat in the pillows, ass up, ready for Deku to fuck him into oblivion and beyond.
But, against all odds, Deku pulled out — making Katsuki wobble, his knees shaking and nearly buckling at the sudden emptiness. He could feel his ass pulsing, sending a fat wad of cum dripping out of him and down, over his heavy balls and trembling thighs.
“Wow, Kacchan,” Deku marvelled, teasing at his puffy rim with his fingers. “So pretty. Have you been counting?”
Katsuki shuddered, his hole fluttering at the stimulation, hips making weak attempts to twitch back into it — and shook his head.
“It’s been six times.” Deku lovingly gathered up a line of cum and pushed it back inside with two fingers, meeting no resistance at all. “You’ve been so good! But I wanna see your face this time.”
And with that, he wound an arm around Katsuki’s waist and flipped him over effortlessly.
Katsuki wheezed, the movement knocking the breath out of him. It took a moment to reorient himself before registering that he was flat on his back. By then Deku was already crawling up over him, leaning in to scatter chaste kisses onto his hot cheeks. And then he bent Katsuki’s legs back and apart like he was nothing more than a doll, before pressing forward to sink his cock into him again.
“Ngh—”
Katsuki was sore and aching, his body already used beyond recognition — but fuck, it felt good to be filled, the sweet drag along his walls on the instroke making his eyes roll back. His body was too overwhelmed to arch into it, but he scrabbled at the sheets under him, staring back at Deku with wet eyes. “D-Deku—”
“Yeah, Kacchan?” Deku hooked both hands under Katsuki’s knees as he set a steady pace, gazing down at him so affectionately that his chest clenched.
Katsuki could hear the obscene, sloppy sounds of his ass as he was fucked, each thrust loud and raw and filthy. It was good — that thick cock spreading him open, filling him so deep — but it wasn’t enough. Deku was still avoiding his prostate, still not touching his dick, keeping him teetering on the painful edge even as Deku fucked six loads of cum deeper into him.
He gasped, struggling to lift his hips under Deku’s body weight holding them down. “Hah — ah — Deku, t-touch—”
Deku dipped his head to kiss Katsuki's jaw, hot breath puffing onto his neck in time with his hips slapping against his ass. “Not yet.”
Frantic, Katsuki reached in between them to touch himself. His arm felt leaden, uncoordinated, barely able to make contact beyond grazing his fingertips across his swollen glans. Even that sent shockwaves through his body, his toes curling — but instantly, Deku slapped his hand away and squeezed tight around the base of his cock, choking off any attempt at orgasm before it could begin. Katsuki thrashed his head with a wordless yell, pained frustration mingling with shock and rage, as Deku pulled his arm up and pinned it to the bed.
“Be good, Kacchan.” Deku’s eyes were wide and shining, his lips parted, staring down at Katsuki’s red, sweaty face with nothing short of reverence. With his other hand, he reached up to cup Katsuki’s cheek, now fucking him slower, gentler, at just the right angle to glide right past his prostate without ever hitting it dead on.
Hot tears spilled over as Katsuki squeezed his eyes shut. “I’m trying—”
“You can do it,” Deku cooed, still holding his wrist against the mattress with one hand. His lips traced the salty tracks on Katsuki’s cheeks, temples, up and across his closed eyelids. “Just one more…”
Katsuki was too far gone, too overwhelmed and desperate to do anything but let Deku kiss his tears away. “I — I need—”
Deku kissed his neck, grinding slow and deep into him. “You need to come?”
“Yes!” His cock was dark, almost purple, leaking a sticky mess all over his belly. He tilted his hips the short distance he could, trying to tempt Deku to touch — to free him from the agony.
“Okay, okay,” Deku soothed, bracing his elbow on the bed and stroking his thumb over Katsuki’s damp cheek. “I promise you will, just wait a little longer…”
Katsuki let out a sob, turning his face into the touch, as Deku gradually began to speed up again. His hole felt loose, stretched so wide that cum flowed steadily out onto the sheets as Deku displaced it with deep, hard thrusts. His dick was twitching against his quivering abdomen, weeping a steady stream of pre that dripped and pooled into his belly button. He was so oversensitive that even that fleeting brush of his cock against his own skin was enough to make him whine, struggling to raise his hips in a vain attempt to steal more stimulation.
Deku was panting loudly, sounding almost wrecked himself. But through it all, his hand never wavered, staying steady and gentle on Katsuki’s cheek even as he fucked him hard enough to knock the air out of his lungs.
“That’s it,” Deku murmured. His other hand released Katsuki’s wrist, beginning a slow descent down his body. “You’ve been so good, Kacchan, such a good boy for me. Just look at you…” He tweaked a nipple between two fingers, making Katsuki twist under him with a hoarse yell. “God, you’re gorgeous, so fucking pretty. You feel so good, make me feel so good…”
Katsuki’s whole body felt like it was on fire. Deku was his only anchor: the rough palm cupping his face, the blunt fingers playing with the mess over his abs, the fat cock fucking past his prostate with deliberate, teasing strokes. When he forced his eyes open, Deku’s gaze was intense enough to pin him in place. He felt tender and raw under it, gut burning with helpless euphoria.
“Deku,” he rasped, fisting the sheets, “h-hurry—”
“Beautiful,” Deku gasped, hips slapping fast against Katsuki’s abused ass and filling the room with the sounds of sex. “So perfect, all mine… my Kacchan… ah, fuck, I — I’m—!”
For a split second, a spark of light crackled around Deku’s back as his mouth dropped open in a silent moan. Katsuki could feel every twitch, every pulse inside him when Deku came, flooding his ass yet again. He could hear himself gasping, choking out encouragement and pleas — “fuck yeah, Deku, fill me up, touch me” — toes curling, tilting his ass up for Deku to use.
Finally, finally, Deku reached down to fist his cock in one rough hand. Katsuki howled — bucked — and it only took one swipe of Deku’s thumb over the weeping tip before his back was arching, a scream ripping from his throat as he came so hard his vision went white. Every exhausted muscle tensed with pleasure so powerful his body felt like it was falling apart, hot cum shooting up over his belly to paint his chest, his neck, even the underside of his chin.
When it was over, he collapsed into the bed, heartbeat pounding in his ears and sucking in air like a drowning man. He felt like he’d been hit by a truck.
Deku laughed giddily, slumping over and squeezing tight around Katsuki’s waist. “Kacchan oh my god, that was incredible. You did so good, you were so gorgeous, I love you so much…”
Katsuki couldn’t speak; could barely hear Deku’s babbling over the ringing in his ears. His body didn't feel like his own any more — his limbs weren't communicating with each other, his vision blurring, his head filled with a noisy buzz. He was floating, body heaving and soaked with sweat, almost high in the wake of such a powerful orgasm.
Deku reached up with a shaky hand to stroke Katsuki’s hair back off his damp forehead. Idly, he licked a stray droplet of cum from Katsuki’s chin before pressing their lips together softly. “I knew you could do it,” he whispered into Katsuki’s slack, panting mouth. “My Kacchan’s amazing, after all.”
Still pressing sweet kisses onto Katsuki’s face, Deku slowly started to ease his hips back. As soon as the head of his softening cock slipped free, a stream of cum began to flow from Katsuki’s sore, stretched hole. Hissing quietly, he attempted to close his thighs — but immediately, Deku reached down to hold his legs apart with strong, sure hands. Katsuki twitched, his ass pulsing around nothing as cum continued to leak out of him; as Deku held him open with his thumbs and devoured the sight with dark, hungry eyes.
Katsuki groaned, covering his face with his arms and aiming a perfunctory kick in Deku’s general direction. “Go run me a bath, you freak of nature.”
Deku huffed a little, but kissed the inside of Katsuki’s knee anyway. “I’m your freak, Kacchan.”