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Katsuki pinned Eijirou to the bed and kissed him roughly, dragging his tongue across knife-sharp teeth as his hands worked blindly between them. He wanted them naked yesterday, but the adrenaline in his veins had him shaking too much to even manage a damn zipper. "Fucking stupid ass shit-" Eijirou gripped his wrists and flipped them, growling into the curve of Katsuki's neck as he unbuckled their pants with practiced efficiency.
It wasn't the first time they'd raced home desperate after patrol, nor would it likely be the last. It was, however, the first opportunity either of them had had to attempt one of their "Not Normally Possible" fetishes.
Three years ago, freshly dating and new to learning boundaries with each other, Eijirou had stumbled in on Katsuki with a sound buried deep in his dick. There'd been lots of embarrassed yelling and cursing, a thrown sound, and, finally, a much needed conversation about each other's kinks. Over the years, they'd tried many of them. Some were 'meh', others were immediately adopted into their sex repertoire. But there were some that, though they'd talked openly about them, simply couldn't be attempted.
Not without a quirk.
One of which Katsuki had been tagged with earlier that afternoon.
It was a quirk called Stretch. Anyone or anything affected by it was made flexible beyond measure. In other words, elastic as shit.
"You sure you wanna do this, babe?" Eijirou asked, half whispering, half biting at Katsuki's earlobe.
"Fuck yes, shit, been wanting to try it for years." Katsuki groaned, rolling his hips up against his boyfriend's rock hard cock.
Eijirou tipped his pelvis back and out of Katsuki's reach, provoking a whine from the blonde and a scandalized scowl. "You have to promise me you'll tell me if it hurts." he said seriously, staring his explosive boyfriend down with an unusual intensity.
"I'm not gonna bow out of-"
"No. I don't care how much you want it, if it hurts, tell me."
Katsuki glared, cheeks flushed with arousal and a hint of nerves. Eijirou was right. One of them needed to keep a clear head, but that didn't mean Katsuki had to like it. "Fuckin- fine! I promise. Now will you fuck me?"
Eijirou grinned at him, dark and primal, and the heat immediately returned to Katsuki's skin. He squirmed under the weight of those red, red eyes, the hunger he saw in them.
Katsuki wanted to be ruined tonight, and Eijirou planned to deliver. The redhead nipped at his lips and Katsuki's hips jumped of their own volition, seeking out some sort of friction to ease the growing ache in his gut. "Just get on with it, you bastard!"
"You're absolutely sure?" Eijirou cooed, teasing the words against Katsuki's jaw as his fingers moved down to circle his drooling cock.
Katsuki bristled and grabbed Eijirou's face in his hands, waiting until he had his full attention before spitting out his answer. "If you ask me one more time if I want you to stuff your monster cock in my dick," he snarled, voice pitched low with frustration and loosely contained lust, "Then I will bind you to the damn headboard and do it myself."
Eijirou stiffened for half a second before planting a quick kiss on Katsuki's face and shoved himself down the bed to settle between his legs. He wrapped his long, calloused fingers around his boyfriend's flushed and needy dick, stroking it lightly while tracing the head with a sloppy tongue, and circled closer and closer to his weeping slit before finally laving across it, one hand planted on Katsuki's stomach to keep him from bucking out of his grip. Drool pooled in his mouth as he caught Katsuki's eye, smiling like a cat with cream before he sunk the entirety of his tongue into Katsuki's urethra.
Katsuki buckled under the sensation, chest heaving, back tight, every muscle vibrating at the absolute impossibility of Eijirou's tongue in his fucking cock. Pure desperation was the only thing keeping his eyes open as he watched the way his glans bulged around Eijirou, the way spit and pre mixed and ran down the sides to coat Eijirou's fingers. It was obscene and messy and something straight out of Katsuki's deepest desires. He swallowed around his own suddenly dry mouth, trying to find his voice. "More, ohmyfuckinggod more, please!"
Eijirou hummed at him and wrapped his lips around Katsuki's cock, bobbing slowly, as if without a care in the world. His hand traced comforting, lazy patterns across Katsuki's stomach, soothing the over the tight muscles fluttering beneath his fingers as he sank deeper. He kept his steady, torturous pace as Katsuki fell apart, ignoring the demanding hands that finally found their way to fire red hair, gripping so tight Eijirou knew his scalp would ache later. It was worth it for the babbled mix of curses and praises, the shaky breaths.
"Please Ei, shiiiit, fucking fuck me- AH!"
Eijirou sucked hard, dropped fast, and shoved as much of his tongue as he could into his boyfriend's cock. His fingers tightened around the base, hardened into an impromptu cockring, and held his orgasm at bay while Katsuki writhed, only to pull off a moment later with a lewd pop, watching with heated fascination as Katsuki's gaped slit slowly shrunk back to normal.
Katsuki squirmed and shook beneath him, trying unsuccessfully to drag Eijirou's mouth back onto his length. "Noooo no no no, fuck you!"
Eijirou grinned, leaning into the sadistic pride he felt at turning his usually bullheaded, high-strung, cocky as shit boyfriend into a moaning mess. Once satisfied that Katsuki had slipped away from his climax, Eijirou unhardened his fingers. They slid down briefly to Katsuki's balls to tug and roll them, teasing and slow, before moving back to his flushed tip. "Give me a color, Kats."
"Green dammit, sofuckingreen," he slurred, eyes focused on the fingertip dipping in and out of his dick. It squished in deeper, to the first knuckle, and Katsuki whimpered. He tensed his thighs and bucked his hips in an attempt to push it further.
Eijirou chuckled darkly, swirling against Katsuki's sensitive walls before pulling out and adding a second finger. "Look at you babe, your such a fuckin' slut for it," he scissored his fingers wide, spreading Katsuki's urethra until it drooled and then shoved in a third finger, "I bet I could fucking fist your needy cock. You'd like that, wouldn't you?"
Katsuki arched clear off the bed, whining at the stretch of his glans and the pinpoint accuracy of Eijirou's words.
"Knew it." Eijirou mocked, rocking his fingers faster, "You'd love it, you little slut." he slid Katsuki's legs together beneath him and settled himself on the man's thighs, stroking himself once to take the edge off.
Katsuki was a fucking mess; tears pooled at the corners of his eyes, panting and flushed and overblown with pleasure. It was so much, more intense than anything he'd ever managed with a standard sound. Metal and strung beads didn't come fucking close to Eijirou's thick fingers buried to the hilt, firing off nerves he could hardly ever reach. Then they were gone, and in their place was Eijirou's own dick, solid and warm and a dark, painful looking red. He nudged their tips together, smearing through the mess Katsuki had made, and pushed.
The moment the first inch popped in, Katsuki came.
His cry of shock strangled off into breathy nothingness as his dick tried valiantly to milk the cockhead inside of it. Cum splattered out around Eijirou's tip and the extra lube had him sliding in another inch. Smoke curled from Katsuki's palms and the tears finally spilled free down his cheeks; there was too much sensation, too much too muchtoomuch- "Y-yellow!"
Eijirou froze immediately.
He braced himself on the bed with one hand and carefully reached up to Katsuki's face with the other, cupping his cheek gently and letting him bury into the comforting contact. "Shhh, you're good Kats, so good, just breathe," he whispered, waiting for the shaky inhale and smiling when it came, "So good baby, can you do it again? Take another breath for me."
Slowly, so slowly, the tightness at the edges of Katsuki's vision faded. He licked his dry lips and kissed weakly at Eijirou's palm while he let his body adjust. After a moment, he started laughing.
Eijirou's face twisted briefly with worry before he bubbled over with his own laughter.
"Holy fuck Ei," he snorted, throwing his arm over his eyes and gripping Eijirou's wrist tight, holding him close, "Your dick nearly broke me, you asshole."
"I'm barely in you!" Eijirou insisted, staring down between them to their still joined cocks.
"Yeah, and your dick's fucking massive!" Katsuki bit back, though he was laughing too hard to sound even the slightest bit upset about it.
Eijirou pouted, wiggling his hips in tiny circles to test the waters again, "You like my 'massive fucking dick', shut up."
Katsuki was too busy moaning to respond, once again very aware of the fat cockhead stuffed into his own. It shifted, sliding a fraction deeper and bulging out just that much more of his hole and suddenly Katsuki needed more, needed to know what all of it felt like seated completely inside of him. "Green, Ei," he breathed, bracing his hands on Eijirou's shoulders so he could watch, "Please, so, so green."
Eijirou swallowed tightly and nodded, reaching down to guide himself with one hand; he pressed in carefully, entranced by the sight of Katsuki's dick stretched wide around him. Unconscious hardening spilled down his spine and he shivered. "Shit babe, you're so fuckin' tight," he groaned, sinking slowly deeper, inch after inch. Even with the quirk, Katsuki's cock was determined to squeeze firm and warm and wet, better than any fleshlight Eijirou'd ever tried. Hell, just the visual was one of the most erotic things either of them had ever seen.
Eijirou paused once he'd made it halfway, biting his lip as a new idea formed; he moved his hand down from his own dick to Katsuki's and squeezed, grunting at the increased pressure. He could feel himself, feel his own length as it steadily bulged out more and more of his boyfriend's messy hole. "Fuuuuck," he wheezed, pushing deeper, craving more.
Katsuki shook beneath him, fingers clenching and unclenching as he twitched and writhed. His body was wound tight, even after cumming so recently, and he could feel another orgasm steadily building deep in the base of his pelvis. It was hot and heavy and staticky and just waiting for the right moment to snap.
They took it slow, neither of them wanting to stop again now that it was finally happening. Eijirou's knees ached from the weird position, Katsuki was coated in sweat, and the room smelled like ash from his quirk, but fuck if it wasn't the most amazing moment ever.
And then the tip of Eijirou's cock nudged into something and Katsuki nearly bucked clear off the bed, his spine rigid and bowed as sparks and crackles singed the comforter in his balled up fists. "Holyfuckingshit Ei, what the hell was that?!"
Eijirou pulled back just a touch before sliding forwards into that squishy barrier again, grunting as Katsuki tensed around him. "I think," he groaned, voice ragged and gravely, "I think I found your prostate."
"Fuck, holy shit-," Katsuki arched, driving Eijirou further down his stuffed cock to jam his tip against it. Stars popped behind his eyelids at the sheer intensity; his words clattered together in his throat, unable to make it past as he momentarily forgot how to breathe.
There was a dick, his boyfriend's giant fucking dick, inside of his, deep enough to press against his prostate, and Eijirou still wasn't fully sheathed.
"More, I need more, dammit Ei, PLEASE!" Katsuki rolled his hips unconsciously, grinding against the head of Eijirou's cock with a sudden frenzy. It wasn't until Eijirou pinned him to the bed, halfway stilling him, that he noticed the look of near feral lust on his boyfriend's normally sweet face; sharp teeth flashed at him, red eyes wide and hungry, nostrils flared as Eijirou forced himself not to fuck down into that ridiculously tight heat.
"Dammit Katsuki, stop!" he growled, his fingers hardening into claws as Katsuki jerked in his grasp, "I'm gonna lose it if you keep fucking movin- ohFUCK!"
Katsuki wiggled hard and sudden pleasure exploded through his body; white hot lightning raced up his spine and through his limbs, a bonfire of pure sensation unlike anything he'd ever felt in his life. He could distantly hear his quirk firing off and the sound of Eijirou snarling curses into his ear, but they were impossible to focus on.
There was only the feeling of Eijirou's thick, fat cockhead as it slipped into his prostate.
Time got... blurry, after that.
He recognized the impossible fullness in his groin, the deep, stroking rhythm of Eijirou frantically chasing his own completion, his own pathetic whimpers and stuttered breaths, but it wasn't until Eijirou bit into the meat of his shoulder and snarled out a broken, "f-fuck, fuck- gonna cum!" that Katsuki snapped back to reality. A different, blisteringly hot heat spilled into him, flooding him full and he cried out, twisting pathetically on the sheets as shot after shot pulsed through him. His urethra was too thoroughly stuffed for Ei's release to spill out, so it flowed down, down, deep the opposite direction.
Katsuki felt the distinct and life altering sensation of Eijirou's cum swirling into his balls and then blacked out.
He woke suspended in warmth with strong arms wrapped around his chest, soothing words whispered into his hair as Eijirou gently washed his leaden limbs. "Ei," he mumbled, impressed with himself for getting that much out.
Eijirou hummed against the crown of his head, nuzzling against his scalp. "Hey there, glad you're back babe."
Katsuki huffed, too tired for much else, and snuggled deeper into his boyfriend's hold. "'ove 'ou," he said finally, half asleep when he remembered the words.
"I love you, too, Katsuki."