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Katsuki swallows him down whole, easily and without hesitation.
“A-ah!”
It’s warm, everywhere. Soft and full as the blond teen wastes no time in sucking and hollowing his cheeks around Izuku’s cock. The velvety innards of his mouth make the freckled teen gasp and shudder, tears collecting in his eyes too quick and too sudden because of the overwhelming stimulation. Katsuki rumbles a deep chuckle, vibrating all around his most sensitive parts and Izuku tries his hardest not to cum immediately.
“K-Kacchan, stop…”
The blond teen pulls off his member with a ‘pop’ and smirks, one hand stroking him languidly, eyes half-lidded and cheek leaning against Izuku’s red, leaking head.
“What’s wrong, baby? Too much?”
Izuku hitches a moan and puts a shaky hand on Katsuki’s wrist, stopping him from continuing his ministrations as the freckled teen tries not to let out a cry. Deku’s trembling grip does nothing to stop his movements, of course, but he decides to humor the poor boy anyway and pause as Izuku catches his breath. Just as Deku thinks he’s almost completely calmed down, the other boy flashes him a feral grin and tightens his grip once more.
“You still haven’t answered me, Izuku.” Katsuki husks, giving his small cock a firm and vicious stroke.
He keens, voice loud and whiny as it tapers off into a light sniffle. Scarred fingers scramble to hold Katsuki’s unrelenting fist as it continues to pump him, almost unbearable and overstimulating. It felt so good that it hurt.
“Please, please, please, please Kacchan. Stop, I can't do it, I can’t take it, I just came – it hurts it hurts!” Izuku babbles mindlessly, arching into Katsuki’s fist and squeezing his eyes shut – determined not to let any tears escape.
“Poor baby.” Katsuki coos, strokes softening just a touch. “Are you about to cry?” A painful squeeze. “Hm? Can’t handle what big, mean Kacchan’s giving you? You’re so pathetic and cute, Izuku.”
One of Katsuki’s big, calloused hands is still gripping his hip, holding him down to the bed as Izuku thrashes, shaking his head from side to side and trying so damn hard not to break. His tiny cock burns, twitching and drooling in the other boy’s harsh hold and so close to coming for the third time that hour. He whimpers, hyperventilating and twitching so deliciously as Katsuki plays him like a fiddle.
“Fuck, baby, you look so good.”
Izuku whines, chasing his orgasm before yelping as Katsuki changes his grip to palm furiously at the head of his weeping cock. He’s so damn sensitive, he feels every groove--every brutal callous and palm line on his head and absolutely wails as he comes harder than he ever thought he was capable of.
Foolishly, the freckled teen thinks he’s safe. Katsuki pulls his hand off of his red member with one last firm stroke and he thinks he’s finally free to come down properly from his orgasm. Chest heaving, Izuku finally relaxes into his pillow with closed eyes and a rueful sniffle.
A click of a bottle cap and then a shift of the mattress beneath his feet. Katsuki growls in his ear. “Oh no, you don’t.”
“Wha--?”
Suddenly, two thick and slick fingers push into his sloppy hole in one swift movement. This time, Izuku properly does scream at the relentless fingering and teasing inside his hole--especially as it's paired with fervent licking at his already spent and way-too-sensitive cock head. His eyes fly wide open and he bucks his hips hard, nearly getting Katsuki’s digits out. The blond teen’s lips pop off his head and thankfully, instead of returning to the tip of his cock, Katsuki opts to pepper kisses all over his forehead and neck. The hurt burns everywhere and Izuku can no longer help it when he openly starts sobbing in frustration and overstimulation.
“Stop! Please! Kacchan, I-I can’t, Ican’tIcan’tIcan’t--fuck! Plea-ase!”
It’s little less than a minute before he comes again, sobbing and shaking as watery spurts come from his spent little cock. It’s painful, the way his thighs won’t stop trembling and his head is so damn fuzzy with pleasure. He can vaguely hear Katsuki speaking, words buried into the hair at the top of his head as the teen mutters a litany of ‘cute cute cute – fuck, baby’ over and over again.
His sobbing and whimpering grows ever more incoherent as Kacchan trails his lips down to his sensitive chest, sucking at his left nipple while his unoccupied hand goes back to stroking Izuku’s flaccid length.
“Please stop, please stop--I need a break Kaccha--ah! Stop it! I can’t come--I can’t come anymore it hurts so bad!” Izuku sniffles and whisper-yells as he squirms away from the onslaught on his senses. All of his orgasms have been ruined and every part of him feels sensitive to even the slightest breeze. Katsuki smiles pleasantly as he watches his rival’s eyes grow unfocused as tears continue to slide down his face.
“You’re doing so good, baby. So good for me. Just a little more, I promise, okay? One more, one more baby and I’ll leave you be. Your cock is just so cute, huh? So fucking pretty. Shit, and the way you cry too. So fucking pretty for me and me only.”
Katsuki pauses his dirty talk to give a slow and firm stroke to Deku’s once-more leaking dick. The pre-cum and spend from the last three or four orgasms makes a loud squelch that makes Izuku sob harder. “Mm, fuck, baby. Listen to that. That’s all you.” A choked whine. “That’s what I did to you. This is mine, right? Say all of this is mine and after I make you come one last time, we’re done. Okay?”
“Hnh--! Kacchan…” Deku gasps softly, turning his head from side to side. “No, no, no, no, no--F-FUCK!”
Katsuki lets out a rough chuckle, dipping his head down to place a noisy kiss and suck on the other boy’s balls. He revels in every tremble coming from the shorter boy beneath him, holding Izuku closer as his fingers pick up the pace in its search.
“Say it.”
He whimpers a little, bucking even harder in Katsuki’s grip. “N-no– F-hck!”
“Say it, baby,” Katsuki insists, whispering again into the sweaty, flushed expanse of Izuku’s neck. He leaves messy pecks to each freckle he comes across, unrelenting in the speed of his fingers as it hits all the deepest, warmest parts of his lover’s core except the one part where he needs it the most. Izuku lets out the most desperate moan that has the blonde boy groaning as he digs his brow to the other boy’s bare collarbone before leaning up to swallow his whimpers. “Tell me you’re all mine?”
“Mmhn… Gh… Ka-ah–K… Please… One–one last? Please…”
Bakugou lets out a desperate chuckle against his temple, licking his tears as they streamed down his flushed cheeks. He sounds crazed. A little unhinged. Despite how he’s been plucking at Deku like a puppeteer, the blonde man sounds like his control is slowly cracking away from him. “That’s not what I asked for. Do you want me to punish you? Huh? Is that what this is? Do you want me to wring another fuckin’ four orgasms from your pathetic little dick?” He punctuates the last question with a small smack to the head of his cock.
That’s what gets Deku’s attention. He flinches, roughly, against Katsuki’s rigid hold on him. Backing into the fingers still in him while trying to move away from the painful stimulation on his front. He gasps, fingers digging almost painfully into Katsuki’s forearm. “Stop! No, no no no – I don’t, I don’t. Please, please stop please–”
“No.”
Deku goes silent, chest heaving with shuddering breaths as he plants his face into Katsuki’s shoulder. His rival hums gently, kissing Deku’s temple again and feeling his rapid pulse thumping against warm skin. Waiting, patiently, allowing only the smallest reprieve with the onslaught of pleasure and remaining a hair’s width from the one spot he knows the freckled boy wants to be touched the most.
His cries die out. Soft, wet, desperate sniffles and breaths while Deku fervently tries not to make any more noise. He’s considering Katsuki’s request. Bracing himself, more realistically. He has no choice in the matter, no other option at this point – it all felt too good but too painful. Too hot. Too much. Kacchan was always too hot and too much and too strong and too fast, but that’s what made it feel so good in the first place. How Kacchan always played him perfectly, like a fiddle.
“I–I’m…”
Katsuki perks up, moving the fingers inside of him just the smallest bit. Brushing tantalizingly close. “Mm?”
“I’m y-yours.”
A beat. The fingers neither slow down nor speed up. Deku begins to feel uneasy, squirming, babbling, crying in a way that makes Katsuki’s cock throb.
“... I’m all K-Kacchan’s. I’m yours, I–FUCK!” Deku cries, back arching oh so sweetly as the other boy goes wild, massaging his prostate and fisting his cock until the freckled boy feels like he might piss himself from stimulation. Everything burns, hot and heavy as Katsuki wastes no time in showing him what exactly belonging to his childhood friend entails – he licks at Deku’s neck, trailing down before kissing and biting at his chest. It’s far too much all too suddenly and he thrashes in the sheets, unable to escape torrent after torrent of Katsuki’s particular obsessive brand of love.
The other man only pants and laughs dazedly into the junction beneath Izuku’s jaw. His brain is far too fuzzy to register the dark and pleased face Katsuki makes at him, one of cruelty and utter adoration. “Good boy, fuck, such a good boy… You’re my good boy, aren’t you – hah?”
Something in Izuku’s mind shatters, between the relentless pleasure on his g-spot and the never-ending simulation around his cock. He simply continues to cry and nod, cute breaths short and stutter-y as he looks up at Katsuki with such a desperate expression.”Mhm–ah! I-I’m Kacchan’s g-good boy!” He slurs in a shout, barely coherent. “C-can I? Please? K-K, hh…!”
Katsuki laves a tongue over his chest with long strokes and a choked near-whine. “Yes. Fuck, yes yes – you deserve it, baby.” He whispers, almost reverent. Deku, for all that he tries, doesn’t seem to be all there and doesn’t even register what Katsuki says. He rolls his eyes, almost lovingly, before doubling down and continuing his ministrations on his little lover with more fervor than ever, fingers circling tighter around an adorably red shaft and wrist damn near aching from how he hammers at Izuku’s special spot. His baby’s worked so hard for it, hasn’t he? He deserves a reward.
“Come, Deku.”
The bow snaps and green eyes fly wide open, mouth open in the dirtiest expression Katsuki has ever seen. Freckled thighs clench around his hand and tremble violently, riding out the pleasure in waves. Izuku’s chest heaves desperately, yet no sound comes out except a strangled keen as he falls apart around Katsuki’s rough hands. It’s a dry orgasm, evident by the lack of come that spurts from his still-twitching cock. It feels like it goes on for hours and hours, mind-numbing and time-stopping for the both of them.
Eventually, Deku collapses on himself and relaxes for the final time – laying prone and vulnerable against Katsuki’s sheets. The taller man only snorts to himself and gathers him into a cuddle, bringing him back against his chest and leaving one last kiss down the bruise-mottled column of Deku’s neck.
“Don’t you ever forget who you belong to again, shit nerd."