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There was no simple way to define Izuku’s relationship with his pet Hybrid, Kacchan.
On the surface they were similar to any other pet and owner companionship. Izuku would care for and provide for the Wolfdog, while Katsuki would offer company and loyalty, always keeping an eye on the house while his master was away. He’d play nice when they went to dog parks and generally followed all of the orders Midoriya issued.
Except…there was another part to their relationship that the general public never got to see. A part that filled Izuku with nothing but the most shamefully deprived need.
He let Kacchan do things that no other owner would ever allow.
Hell, the first time that it happened, it was by complete mistake. He hadn’t meant for the wolfdog to mount him. But, one thing led to another, and Izuku had found himself with a new craving that was hard to abate anywhere else. Of course he still slept with normal humans; but their cocks weren’t anything like the thick knot that could fill him so good.
It was spoiling Kacchan absolutely rotten too. It felt that the moment Izuku stepped into his own home that his ass was up for grabs, and the wolfdog wasted little time in trying to tear his clothes off to reach it.
Most days he’d hunker over and gladly work his clothing off, the tension of the day practically melting off when he felt a hot tongue on his slit.
It had become a bit of a routine by now.
And yet there was always a part of Izuku that was curious. Kacchan would obediently use his mouth whenever his owner needed it- but would the opposite hold true? I mean, it would only be fair, considering how often he spread his legs for the hybrid to lick. It was a pressing question at the back of his mind whenever he saw that impressive cock sticking from its sheath.
Like right now. While Kacchan licked over his own prick, hind leg raised high and proud, not a care in the world as his spine bent to clean himself off with lazy laps of his tongue.
Izuku felt a strange bubble of heat when Bakugou’s tongue traced over himself, cleaning the matted fur that embarrassingly enough held a mixture of his own arousal and seed. They’d just finished with another quick round after Izuku came home, his body pleasantly sore with scratches and bitemarks to show from it.
He hadn’t bothered to put his boxers back on, content to let his legs splay wide and drip shamelessly onto his own couch. The human bit his lower lip in shame when he brought two fingers down to rub over his clit.
“H-Heh, sorry I made a mess, Kacchan.” He spoke low to the wolfdog, watching his ears perk and accusing eyes turn towards him. Those human features were ridiculously handsome when he lifted an eyebrow in question; no doubt glancing between Izuku’s fingers and his still dripping cunt. He scoffed slightly and went right back to licking after a moment.
Izuku swallowed hard at seeing half of his pink prick still sticking out from its sheath, endlessly fascinated with the anatomy behind it.
He’d felt it inside of himself too many times to count. But what would it feel like in his palm? Drawn forth by his curiosity, Izuku settled himself onto the floor, only wincing slightly from how sore his pussy felt.
Kacchan was unbothered by his approach as he knelt by the wolfdog, giving his strong abdomen a gentle scratch. He felt like any other man from the waist up, save for a patch of blonde fur atop his chest, and it always threw Izuku off when he dipped down towards his lower anatomy. The muscle there was deceptively solid beneath his coarse blonde fur, making Izuku shudder as he pet him.
He felt another hot bubble of shame well up when he watched Bakugou’s rear paw lift, kicking out happily, though his grumpy expression remained. “You’re a good boy, Kacchan. Always treat me so good.” Izuku whispered, sliding his hand further down and pausing just before his sheath. It was a split second hesitation that drew the wolf’s attention.
Kacchan’s tail thumped against the floor once when Izuku cupped around the sheath, amazed at how soft it really was.
“Woah.” He whispered, rolling it around in his palm, nervous eyes flickering up towards Bakugou’s expression. Izuku felt heat prickle along the back of his neck when he saw the curious way his pet stared at him. “Is…this okay? Does it feel weird?” he had to ask, especially when Bakugou started to rumble low in the back of his throat.
The good thing about his wolfdog was how little of a refractory period he had. Izuku startled when he felt his cock twitch in his palm, eyes dragging down to see how the very tip was peeking out once more through it. Well that certainly answered his question.
He felt that familiar arousal pooling into his gut when he gave the sheath another solid pump, this time including the tip. The change in texture between the two surfaces was fascinating. A part of Izuku wanted to run and jot down notes on his findings, a scholar at heart, but he felt locked in place by Kacchan’s low growl. His hand froze against the tip of his prick.
“Everything okay, Kacchan?” he asked, not expecting the sudden buck into his palm. That growl only increased in frequency; at least until he gave the sheath another solid stroke, turning that noise into a groan of contentment.
Izuku bit at his lower lip.
He felt positively filthy when he started to pump over the sheath, watching as more and more of his cock filled into open air, a small bead of precum dripping down the tip.
By now Kacchan had rolled over onto his back, putting his arms above his head and letting his rear legs fall casually open. He radiated smug energy. Izuku crawled further between his legs, Kacchan boring into his owner with those deep red eyes. Izuku felt especially small beneath the large wolfdog’s gaze. “Well looks like someone’s enjoying himself, hm?” the human teased, pausing when he could finally wrap his fist around the shaft.
He made sure to give it a good squeeze, pumping back down to his sheath, slicking his palm with the precum, until it was a smooth glide all the way down.
The pressure between his own legs was getting difficult to ignore.
Izuku palmed across the base while he shifted to properly lay onto his side, holding the wolfdog steady as he finally steeled his nerves. Even from just the protective sheath, he could feel the throb of arousal, watching as more of that bright red prick kept sliding into open air. He gave it a solid squeeze before pressing his lips to the side.
Katsuki jolted up in surprise as he watched his owner lap across his shaft, that cockiness momentarily replaced with nothing but anticipation. It felt…strange. His tail wacked between their bodies as Izuku made a small and excited noise, circling his tongue along the strange tip. His ministrations were rewarded with a small trickle of precum.
“Oh, it tastes really salty.” He mumbled against the tip, wrapping his mouth around it and savoring the taste on his palate. It wasn’t half bad. Off-putting for certain, but not terrible.
Kacchan let out a small huff when his owner squeezed his sheath again, the small bit of skin stretched to the very end. With every lap against his cock it twitched further out, filling into Midoriya’s palm, until finally he was fully erect. Izuku pulled back with a small pant to better appreciate it, amazed at how much bigger it appeared at this angle.
“Good boy, Kacchan!” he praised, giving the blonde a heady pump. “You’re such a good boy for me.”
It was kind of cute how excited two words could get the hybrid, his tail thwacking harder to the ground, hips canting up into his owner’s warm palm. Izuku brought his other hand up to give his stomach a few scratches for good measures. “Be still for me now, okay, Kacchan? I wanna try this..” he mumbled, pressing his plump lips against the side of his shaft again.
He kissed down it leisurely, feeling the oddly veiny texture shift. Once he reached the very bottom of it, Midoriya lapped along the underside where his knot would swell, tilting his head until he could lick up the opposite side. It felt nice against his tongue.
Looking at the blissed-out expression on Katsuki’s face, it appeared as though the big oaf agreed.
It felt so wrong on every level- to do the things that they were doing right now. Taboo in all of the best ways. It only excited Midoriya further when he wrapped his mouth around the tip again, working his mouth around it, pressing his tongue to the underside and giving it a wet suck. Izuku hollowed his cheeks as he slid down, only getting halfway before an excited grunt from Bakugou had the wolfdog bucking into his mouth.
It was so wholly unexpected that he hardly had time to react properly. Izuku pulled back with a wet cough as the tip had managed to hit the very back of his throat, watering his eyes slightly.
“Ah- bad boy!” he mumbled, clearing his throat a few times, trying to will his gag reflex to calm. It wouldn’t have been as much of a problem if Kacchan didn’t have such strength behind his thrusts. It felt nice when it was in his cunt, but in his throat? Not so much.
He wiped off a bit of drool that threatened to fall from his chin.
At the very least Katsuki appeared coyed by that little display, ears pinned back and eyes guiltily cast to the side. It was too cute to stay mad at. So Izuku smiled as he wrapped both of his hands around his shaft, cupping the swelling knot when he kissed the very tip again. “You can’t just go thrusting in my mouth, puppy! You’ll choke me!” He laughed, licking away a small bit of precum that stuck to his lower lip.
It wasn’t long before Izuku was wrapping his mouth around him once more, rhythmically squeezing along the knot as it pulsed in his palm. Such a strange texture- Izuku couldn’t get enough of it as he gave it another solid pump, this time meeting his mouth in the middle.
The rhythm wasn’t difficult to build up again at all. With the wolfdog’s obedience, or patience more so, he could fit more than half of his shaft into his cheek. It bulged obscenely from the side, causing Midoriya’s eyes to go cross in order to stare. Wow. It was as gratifying as he hoped when he slid off, the wet suction of his mouth slipping past the seam, before delving down entirely and loosening his throat.
This time no gag reflex. He held Katsuki’s cock in the back of his mouth, swallowing around it, tasting the heady undertones of pre as it coated his throat. It was a small victory when Izuku pulled back with a deep breath, never quite able to get the hang of breathing through his nose at the same time. He’d even managed to feel the knot twitch around his lips and tongue when he’d hit it.
“You’re taking it so good, Kacchan. Good boy.” He mumbled around the shaft, wasting no time delving down to swallow it back down after filling his lungs.
The hybrid’s hind legs kicked out on instinct, but Izuku kept him steady, both of his hands resting on Kacchan’s waist. No longer did he have to support the base of Katsuki’s cock, not when he could suck nearly all of it down, hollowing his cheeks and letting the tip scrape against the back of his throat. He sucked in a sloppy breath as drool slid down the side of the knot.
Idly he pet his fingers through the fur at the base of Bakugou’s thighs, relishing in the soft growls and open panting that came from his partner.
Katsuki’s eyes were burning something fierce, staring down at Izuku, his ears pinned back and hips twitching slightly. He was getting close. The coils winding tight within Midoriya’s abdomen twisted in further arousal, knowing he was doing a good job. It felt so depraved, but he needed some stimulation. His fingers were still coated in precum when he brought them back to his soaked folds, shuddering at the mental image of Katsuki’s last spend still drooling out of him. Izuku pressed his fingers to his clit, a small mewl leaving him when he worked himself over.
It did manage to distract him slightly. With his mind focusing in on chasing his own pleasure, Kacchan made a noise of irritation, Izuku’s mouth having gone slack around him. The wolfdog was trying to enjoy himself too here!
Thankfully his rumble brought Izuku back to attention, lashes fluttering up at the blonde when he pulled back to breathe through his nose. “Mmm?” he hummed around the thick shaft, only to smile, tucking some stray hair behind his ear as the vibrations caused Katsuki to kick out his rear paws in pleasure.
Curious, Izuku allowed his palm to slip further down…until he could feel the weight of Katsuki’s balls between his fingers. He never really paid attention to them before now.
They were pretty sizable as he massaged them between his fingers and palm, rolling the sack about, until Katsuki’s high and pleased whine caught Izuku’s attention. He smiled slightly as he gave it another squeeze, feeling the cock twitching within his mouth at the same time. So he did like that. Emboldened by this new discovery, Izuku hollowed his cheeks once more as he slid down to the base, deep throating the wolfdog and massaging them between his palms.
The pressure building around his teeth didn’t concern Izuku at first.
He was so focused on keeping his gag reflex down that he didn’t notice the tell-tale signs of Katsuki getting close. The increased breathing, the small twitch to his tail, his rear paws slowly curling tight; all of these were tiny hints that came to one conclusion. With a loud and drawn out whine, Izuku tried to gasp when suddenly that pressure around his teeth increased tenfold.
He gagged when Bakugou knotted behind his jaw, feeling the swell lock behind his teeth, preventing him from pulling away no matter how he tried to turn his head.
“Mnnf-!” Izuku gagged in alarm, only for his eyes to start watering when his throat couldn’t properly clear itself. He could barely breathe through his nose as he swallowed repeatedly around the intrusion, the tip jabbing against his sore muscles as Katsuki twitched away inside of his mouth. Desperately Izuku’s hands scrabbled for support at Bakugou’s hips.
The human glanced up through tear-filled eyes only to see Bakugou staring down at him with a lazy grin, his tail wagging in contentment when they locked gazes.
“De-ku.” The wolfdog jeered, before rutting upwards into his mouth, using his hand upon the back of his owner’s neck to keep Izuku down as far as possible. It was almost too much for the poor man to take. He gagged and coughed while trying to keep his breath, before the sudden burst of saltiness hit the back of his tongue. Kacchan was cumming down his throat.
He had to swallow. There was no other place for the semen to go but down. So Izuku squeezed his eyes tightly shut and focused on swallowing around the waves of cum filling the back of his mouth, feeling himself drooling around his knot, barely able to keep up with the sheer volume that he produced. It made him lightheaded to think about.
Occasionally he had to pause in order to take a stifled breath through his nose, only to openly choke on another thick strand filling his mouth. It felt like it would never end as it settled heavily into his stomach.
Thankfully it wasn’t much longer until those heavy twitches were finally stilling to a halt, leaving Izuku panting for breath through his nose. He felt completely ruined right now, his throat sore, jaw aching something fierce at being stretched open wide for as long as it was. Blearily he attempted to wipe away the fat tears dripping down his cheeks, mixing with the spittle and cum that had escaped the seal of his lips. He felt kind of gross already as it was.
Izuku was also in awe at how he’d managed to cum himself.
His fingers twitched and fumbled across his throbbing clit, Izuku’s hole clenching down around nothing at the final aftershocks that wracked his abdomen. Perhaps he had a few masochistic tendencies here, but he discomforting burn only made this moment all the better, whimpering around Bakugou’s deflating knot.
The human gasped in relief as Bakugou’s knot finally popped out, giving one last twitch on the withdrawal. Izuku couldn’t stop the bout of coughing that left him when he could finally pull in a wet and desperate breath. “B-Bad…” he hoarsely croaked out, stifling the worst of his coughing into his fist. “Bad dog! You weren’t supposed to do that.”
Judging by the unamused look in Bakugou’s eyes, Izuku should have expected foul play. Kacchan didn’t often react well to being called a bad boy.
That proud smirk on Katsuki’s face only made him grow further irritated, Izuku seeing his half-sheathed cock twitch subtly, and he was about to scold him again. Emphasis on was. Because suddenly his face and chin was sprayed with a sudden warmth that made him snap his jaws shut, eyes blowing wide in shock as he recoiled away from the wolfdog.
With his cock still half out of its sheath, Bakugou was pissing on him, of all things.
The warm and slightly acrid spray was soaking across his shirt and chest, dripping shamelessly onto the carpet as Bakugou kept his leg lifted into the air. The Alpha had all of the nonchalance he usually displayed, though that smug smile remained, watching Izuku stumble back with his cheeks flustered a deep and humiliated red.
“Kacchan! No!” he scolded, already working to try and wiggle his shirt off, his thighs shamelessly pressing together. He’d read the articles before.
Bakugou was marking his territory now.
As the master of the household, it wasn’t exactly a good sign that Katsuki was challenging his position. But…He shuddered at the cooling fluids that coated his chest and chin, his throat still wrecked, eyes watered from the residual pain. He’d been thoroughly humiliated, but it seemed his body didn’t get the memo when he felt another trickle of slick sliding out of him.
He had to be a bit of a masochist, seeing how all he wanted to do was prostate his ass in the air and let the wolfdog knot his cunt again.
Was he a little bit fucked up? Maybe. But only Katsuki could judge him now.