Thread by @bunbundiegle

#MHAKinkmas2022 Day 1: Pet Play 🔞 #dkbk dom!dk, sub!bk, throat fucking, anal, toys, praise kink

“What a good boy.” Izuku murmured after a moment, recovering quickly from his shock, before he closed the front door behind him.

Katsuki knelt at the genkan, head ducked down, pink coloring the tips of his ears and trailing down his neck. Izuku hadn't expected his boyfriend to be there, waiting and ready.

The soft ears were already clipped into his blonde spikes; the fluffy tail thumped softly against the floor as Izuku brushed the hair from Katsuki's forehead.

When Katsuki finally looked up through his lashes at Izuku, the first thing he noticed about the blonde was the dark circles under his eyes.

“Did my pet have a bad day?” Izuku cooed, squatting to run his fingers through Katsuki’s hair, scratching his scalp.

Katsuki whined, leaning into the touch. Izuku heard the soft vibration of the tail’s plug working Katsuki’s hole, the furry end swishing back and forth.

These toys were their favorite investment; the quirk made toys were attuned to the buyer, this specific set were ears and a tail that would react accordingly to what Katsuki was feeling. The ears flicked when he was annoyed, pressed down when angered, perked when excited.

But the tail. The tail was always wagging, sweeping side to side or thumping against the floor or the bed or the couch whenever Katsuki had Izuku in his sights when they played. Attached to a vibrating plug, it could keep Katsuki hard for ages.

Izuku ran his hands down Katsuki's bare neck, trailing feather light fingers over the fading marks on his pale flesh.

"Where's your collar, pet? You know we don't play without it." Izuku rubbed his thumb into a pinkish bite mark he'd left a few nights ago. "Go fetch it."

Katsuki huffed, giving him a heavy but silent stare before heading towards the bedroom on all fours, tail perked. Izuku loved watching his pet crawl around their apartment, the sway of his hips and the proud curve of his back, head held high, was a sight he would never tire of.

Izuku took the opportunity to pull off his shoes and hang his jacket by the door. He'd had the afternoon shift, and by the time he came home in the evening, he was usually ready for a quick dinner before falling into bed with Katsuki, exhausted.

But something had clearly happened while he'd been on patrol if Katsuki had greeted him at the door, already in his pet space.

He needed comfort, needed Izuku's guiding hand to silence whatever storm was brewing in his head, and as a responsible pet owner, Izuku was more than happy to provide.

Izuku followed his pet to the bedroom, closing the door just as Katsuki turned to face him, collar in his mouth. He sat at Izuku's feet and dropped the accessory into Izuku's waiting hand.

"Good boy, Kacchan." He strokes the blonde's hair, finger rubbing over the soft dog ears. "Such a good boy, good fetch."

Katsuki's tail thumped against the floor rhythmically at the praise, face flushing a beautiful pink. Izuku took the red leather collar, plush and custom made, and hooked it around Katsuki's waiting throat.

He adjusted it just so, making sure that he could easily slip two fingers beneath it. As soon as the weight of it settled and the little metal name tag bounced against his skin, Katsuki visibly relaxed.

All tension gone from his shoulders, tail swishing happily behind him, his face softening.

The first time they'd tried this out, Izuku had been shocked at the sudden shift in Kacchan's disposition. Now, it was a familiar sight, one that curled happily in Izuku's chest. He smiled and pressed a gentle kiss to Katsuki's forehead.

"So pretty, you're such a good boy, aren't you, Kacchan?" Izuku cupped his pet's cheek. Katsuki's responding smile was dopey; he panted and nodded, giving Izuku's palm little puppy kisses.

He hummed, pressing his thumb against Katsuki's bottom lip. His pet opened his mouth obediently, letting him swirl his thumb around teeth and tongue, drool pooling at the corners.

"What else could we use your slutty little mouth for, pet?" Izuku cocked his head like he's considering what to do even as he hooked his thumb against Katsuki's teeth and pulled him forward so his face was pressed against Izuku's tented crotch.

Katsuki sucked at the thumb in his mouth, tongue swirling around the pad of Izuku's finger.

"That is a good idea, pet. Good boy." Izuku purred and popped his finger from Katsuki's mouth. Katsuki waited patiently, carmine eyes trained on Izuku's face, hands pressed between his open knees, waiting for permission.

Izuku smiled. Katsuki was a vision, on his knees at Izuku's feet, eyes wide and silently pleading, ears flicking.

Even dressed as he is, in a simple, skin tight black t-shirt and a pair of gray sweats (already showing his need with a growing wet spot), Katsuki was breathtakingly beautiful.

"You can go ahead." Izuku murmured.

Katsuki dove in nose first, nuzzling Izuku's throbbing cock through his pants. Well trained out of the habit of using his hands when he's like this, Katsuki latches onto Izuku's zipper and yanks it down with enough force that his pants slide down his hips.

Izuku just chuckled.

"Eager, aren't you, puppy?"

Katsuki huffed, teeth working at Izuku's button. Before Izuku could even step in to help his pet, his pants and boxers are pulled down his thick thighs where they lingered for a moment before he shifted and they fell to pool at his ankles.

Katsuki didn't hesitate. His tongue flicked over Izuku's length, licking a hot stripe from balls to tip. With a teasing kiss to Izuku's slit, Katsuki smirked and swallowed Izuku's cock down in one fell swoop. Izuku groaned.

He'd never felt a better sensation than his pet's mouth around his dick, hot and wet and sucking.

His hands fell to Katsuki's head, fingers gripping blonde spikes. The tail thumped hard. Katsuki sucked and licked and slobbered over Izuku's dick. It wasn't pretty or sweet or cute. It was messy, feral almost, and it burned them both with desperate need.

Izuku's hips bucked forward, burying hilt deep in Katsuki's throat. His pet took it all, eyes prickling with faint traces of tears.

"So beautiful, pet," Izuku cooed, his grip tightening. "Let me."

Katsuki melted into him, hands coming up to rest at Izuku's thighs. A constant grounding touch, but not enough to push or pull. Izuku tapped his finger against Katsuki's head twice, and Katsuki responded with two of his own taps against Izuku's thigh.

Their non-verbal check in, and the green light to continue.

Izuku, with one hand at the crown of Katsuki's head and the other tucked under his jaw, rolled his hips forward experimentally. Katsuki widened his jaw, accepting Izuku's girthy cock deeper. His pet moaned around the intrusion and Izuku couldn't hold it back any longer.

He pulled back, head kissing Katsuki's lips, then slammed in fast and hard. Katsuki choked and gagged only a little before he slackened in Izuku's grasp. Izuku fucked his mouth relentlessly, with sloppy, quick thrusts that he feels against the palm resting at Katsuki's throat.

A puddle of drool formed between them. Katsuki's eyes glazed over, his body slack and the corners of his lips quirked up as far as they could with a dick in his mouth. The whole time, the fluffy blonde tail wagged up a storm.

Izuku fucked Katsuki's mouth until he felt his balls tighten and the spool of heat in his gut coil, ready to snap.

He pulled Katsuki as far down as he could go, hand gripping the back of his neck as he came down his throat. Katsuki moaned deliciously over Izuku's spasming cock, swallowing his load.

When Izuku released him, Katsuki slumped back onto his heels, licking his lips to capture any lingering traces of cum. He looked blissed out, eyes still glassy, swaying where he knelt. His spent cock was softening between his legs, dripping cum onto the bedroom floor.

Izuku tutted, the sound immediately making Katsuki's ears perk, even though his pet didn't shift much.

"Looks like you made a bit of a mess, pet." Izuku said, taking Katsuki's chin and pointing him towards the place where his cum was splattered against the wooden floor. "Good boys clean up after themselves."

Katsuki blearily nodded, falling onto all fours. He pressed his chest down, tongue darting out to lap up his cum. His ass swayed up in the air, his tail swishing back and forth lazily.

The sight alone was nearly enough to make Izuku hard again.

He prowled around his pet, kneeling behind him and reaching for the lub at their bedside table.

"And good boys deserve rewards, don't they?"

Katsuki whined, ears flicking up and back again. Izuku slicked up his fingers, warming the lube up before pressing a finger to the slim vibe nestled in Katsuki's hole. He rubbed at his pet's rim, teasing the edge before slipping a finger in beside the vibe.

Katsuki's tail picked up the pace and he let out a low, rumbling moan.

"Good boy," Izuku murmured, crooking his finger and rubbing his velvety walls.

One finger became two, pressed together alongside the vibe. The constant, gentle vibrations continued even as Izuku slipped in a third finger. Katsuki keened, head thrown back, cum dripping from his chin.

"I think you can take both now, pet." Izuku coated his cock in lube, stroking it to full hardness. They'd been working up to having both his cock and the tail in, slowly adding fingers to acclimate Katsuki's greedy hole.

Katsuki whined, rolling his ass into Izuku's palm, a desperate moan falling from his lips as Izuku pulls his fingers out.

"Ready, pet?"

Katsuki nods frantically.

"I want that floor nice and clean by the time I cum in you."

With a thumb spreading Katsuki's hole open and the other hand gripping the tail at it's base, Izuku pressed the head of his cock into his pet. His hole immediately latched onto him, sucking him in.

The low vibrations of the vibe felt incredible as it was pressed between Izuku's cock and Katsuki's walls.

Izuku rocked forward, burying himself balls deep in agonizing slowness. He gripped Katsuki's firm ass, pulling his cheek away so he could watch his cock be swallowed by the oversensitive pink hole.

Izuku groaned, folding over Katsuki's back. He trailed tender kisses up his spine, grinding his hips against Katsuki in smooth, circular motions.

"Such a good boy," Izuku managed, even though it felt like he'd been punched in the chest. The tight, warm embrace of Katsuki's ass always left him breathless. "My perfect pet."

He could feel the trembling of the tail within his grasp, wanting to twitch and wag as Izuku fucked into Katsuki with measured, sharp snaps of his hips.

His other hand rubbed up and down Katsuki's back before coming to rest at the back of his head, pressing his face down into the final spurt of cum he hadn't quite managed to lick up yet.

Curled over his pet like that, he picked up his pace, the wet slaps of their skin meeting harmonized with Katsuki's drawn out moans. Katsuki's heat was overwhelming, his pink rim tightening over Izuku's cock.

Izuku reached around to fist Katsuki's neglected cock, the hot flesh jumping into his palm. Katsuki shouted, his sharp cry cut off as he came over Izuku's hand and the floor.

Before long, Izuku was cumming deep into his pet, a broken moan of his own stuttering from his mouth.

They panted against each other, sweaty and sticky. Izuku pulled out gingerly, keeping the fur away from any leaking cum. Dried cum was a bitch to get out of these toys.

Izuku collapsed to the floor, leaning up against their bed. He pulled Katsuki up into his lap, turning the vibe off before snuggling into his boyfriend. Katsuki curled up, the tail still swished contentedly against Izuku's thighs.

Izuku rubbed at Katsuki's legs, knowing how his joints usually ached after a play session like this. A few moments later, the blonde seemed to come back to himself.

"Y'good, baby?" Izuku murmured into his sweaty hair.

"Mhmm," Katsuki murmured, voice breathy, the glassiness in his eyes fading as he wrapped his arms around Izuku's middle. "Better now."

"Did you want to talk about it?"

Katsuki shook his head. "Maybe later."

"Okay," Izuku pressed a kiss into his forehead, squeezing him in a tight hug. "I love you, Kacchan."

"Love you too." Katsuki grumbled, nuzzling into Izuku's chest. "Thanks 'Zuku."

"Of course. Anything for you, Kacchan."

[end]

I hope you enjoyed my first foray in dkbk; I've only previously written bkdk so this was a fun switch! I'll be following the @MHAKinkmas prompt list for this month, so go check out what's coming up! This will be up on ao3 later!

ko-fi.com/bundie

Adding the ao3 link to the bottom of the thread as well!

archiveofourown.org/works/43365621