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Katsuki wouldn't call his fiancé a brat. Or at least, he wasn't a brat when they were in the bedroom. Izuku was plenty stubborn in his own right, and didn't shy away from banter at home or in public. When they had sex—particularly kinky sex—he would fall apart in Katsuki’s hands, so eager and willing to please that he couldn't help but spoil him.
Which is why when Izuku started being a little tease while they were getting ready for some charity event, Katsuki was taken aback. Izuku couldn't seem to keep his hands to himself, showing far more PDA than usual when they knew the press would be nearby. At first, Katsuki thought it was simply because he was excited. They'd gotten engaged two weeks before, and he’d been clingier than usual since. So he brushed it off and let Izuku lock arms and keep a hand on his lower back as they did their obligatory socialization.
He drew the line, however, when Izuku’s hand traveled too far up his thigh while they were seated for dinner. When no one was looking, Katsuki pulled him close enough to growl into his ear. “You're going to excuse yourself and go to the restroom down the back hallway. I’ll meet you there in five minutes. Understood?”
Izuku shivered and nodded his head with a breathy “Yes, Sir.” Katsuki bit back a groan at the new title, nodding toward their company. With a string of apologies waved off by the rest of the table, Izuku stood and scurried to the ballroom exit. Red eyes watched him disappear through the doors, then flicked down to his watch.
Once a little over five minutes had passed, Katsuki left under the guise of checking on his fiancé. He’d told Izuku to go to this specific restroom, knowing it was a single stall. Katsuki firmly knocked on the door once. “Izuku? It's me, baby.” The door opened, and he quickly slipped inside.
Izuku was looking off to the side, fidgeting with his fingers. So he's aware, at least. Katsuki stepped forward, grasping Izuku’s chin and forcing him to meet his eyes. “You know, you've been acting real naughty tonight, pet. Care to explain yourself?” He watched Izuku's throat bob as he swallowed. “I'm only giving you one chance.”
“Well…um, we did our shots yesterday, but we didn't do anything like usual last night or this morning. So I'm a little…” Izuku trailed off, skin flushed and eyes darting away again. Katsuki tilted his head back more, exposing the unblemished skin of his throat. “Oh, are you all pent up because you didn't get your dick wet for a day?” He cupped Izuku's core, feeling the heat of it through his dress slacks. “I’m pent up too, you know. But I’m not the one acting like a needy slut, am I?”
Izuku shook his head, tears beading at the corners of his eyes. Katsuki felt his own dick throb at the pretty sight, but he ignored it. In the darker recesses of his mind, Katsuki has thought of ways to punish his puppy if he ever acted out like this. Eyes still locked on Izuku, he licked his lips. “I think a punishment is in order. If my little mutt is that desperate,” Katsuki pulled him closer, whispering directly into Izuku's ear, “you're gonna have to prove to me that you deserve to come at all tonight.”
At Izuku’s sharp inhale, Katsuki released his chin. He glanced at Izuku's crotch, then gestured to the forgotten toilet and sink next to them. “Clean yourself up, baby. We still have an hour of this shit before we can leave.” Katsuki brought one of Izuku’s hands up to his lips and pressed a reassuring kiss to the knuckles. “I’ll be right outside the door.” He turned and left, leaning against the wall while he waited.
A few minutes later, Izuku exited the bathroom, the only lingering evidence of their talk being the red tinge at the tips of his ears. Katsuki looped his arm around Izuku's, leading him back to their table. He was able to smoothly reassure everyone there that they were both okay. One of them pulled Izuku into a conversation about the latest batch of interns from UA, effectively distracting him.
Katsuki watched his fiancé grow more energetic as the conversation went on, not even bothering to hide his smile. The person on his right, a hero from Round Face’s agency whom they've teamed up with before, gently nudged his shoulder. “You certainly got it bad, eh Dynamight?” Katsuki hummed, eyes still focused on Izuku.
“Sure fucking do.”
Katsuki took his time unlocking the door to their apartment. He could feel the energy radiating off of Izuku, a mix of desperation and anticipation. It was rare that Katsuki needed to punish his pet. During the rest of the event, he’d crafted a scene that left him just as turned on as his fiancé. Once the door was opened and they stepped inside, he took off his shoes and went directly to the couch.
While he would usually be more careful, Katsuki was feeling impatient. He shucked off his jacket and threw it over the arm of the couch before sitting down. He spread his legs, looking straight at Izuku, who was fumbling with his own loafers in the genkan. Katsuki snapped to gain his attention, and Izuku's head whipped in his direction.
“Before we start, I want you to give me a color, ‘Zuku.” Katsuki watched for any signs that Izuku was uncomfortable or too anxious to do the type of scene he had planned. “Green, Master.” The words were softly spoken, but confident. Katsuki nodded approvingly. “Alright. Listen to me carefully, pup. The first thing I want you to do is strip for me. Give me a little show right here; let me see how eager you are. After that, you'll crawl to the bedroom and retrieve your gear. Collar, ears, and tail only. We won't be needing anything else.”
He watched the rise and fall of Izuku's chest as his breath hitched. “Yes, Master. I understand.” Katsuki leaned back and draped his arms over the back of the couch. “Good boy. You may begin.”
Izuku had already removed his jacket, so he started with the top buttons of his dress shirt. His hands shook, but he grew more confident as he went on. Katsuki watched as the silky green material slipped off one shoulder. With every expanse of soft, freckled flesh exposed, Katsuki’s fingers twitched. He wanted to run them over the lines of muscles and the raised skin of the scars.
When Izuku finished with the last untucked button, his hands dropped lower and began to undo his belt. He pulled at it slowly, letting the leather slip through each loop deliberately. The metal buckle jiggled as it bounced off the hardwood after it fell, Izuku also working on popping the button on his slacks. The inner hook soon followed, then the pants were shimmed down over thick thighs and strong calves until they pooled at Izuku’s ankles.
This whole thing had been Katsuki’s idea, yet he didn’t know where to look. His eyes greedily darted back and forth between the obvious dark spot on Izuku’s boxers, and where those dexterous fingers were opening the final button of his dress shirt. Izuku hadn’t worn an undershirt, so when the sides of his shirt parted, Katsuki was greeted with one of his favorite sights. He licked his lips, eyes pulling up from where they had been gazing to take in the view. Testosterone had given Izuku a generous happy trail of thick, green hair that dipped below the band of his boxers. Katsuki could still remember when Izuku had burst into his dorm at UA to excitedly show him the first hint of fuzz there, and they’ve both been obsessed with it since.
Katsuki stopped him before Izuku could start taking off his underwear. “Come here, puppy.”
Izuku hesitated for a moment, before he slowly sank to his knees and crawled toward where Katsuki was seated on the couch. Once he was in front of him, Katsuki gestured for him to stand. He grabbed Izuku by the hips and pulled him closer. Like this, he could really admire his pet’s body. Katsuki’s fingers danced along Izuku’s hips, drawing closer to the patch of hair on his lower stomach. “Fuck, you’re so hot, Izu.”
Katsuki dragged him in ever closer, nearly making Izuku lose his balance and causing him to need to brace his hands on the back of the couch. His face almost touched the other’s skin, Katsuki taking in the scent and heat of his partner. He watched as the muscles tensed whenever his breath would rustle Izuku’s happy trail.
“Let’s get this last bit of clothes off you, hm?” Katsuki dipped his thumbs beneath the waistband, chuckling at the enthusiastic nod he got from Izuku. Slowly, he stripped Izuku of his boxers. When the fabric reached his knees, Katsuki palmed over Izuku’s cock. “You’ll get to play with this soon. For now, though, we need to get you your gear, don’t we?”
“Yes, Master.” Izuku’s eyes had already begun to grow glassy, much to Katsuki’s satisfaction. Katsuki helped him drop down to his knees, then stood.
“Alright puppy, go fetch .” Katsuki shamelessly stared until his pet disappeared around the corner. Once he was out of sight, he set about cleaning up the scattered clothes. After everything had been folded and set aside, he sat back down on the couch to wait.
Sweat had already started to bead on Izuku’s forehead when he returned with his gear. Because he had to crawl, his ears were carefully held in his curled hands, his collar draped over his neck, and the plug of his tail between his teeth. He sat between Katsuki’s legs, raising his hands and bowing his head to offer up the objects to Katsuki. Deciding to indulge his pet for completing his task so well, Katsuki scratched behind Izuku’s ear with a coo.
He clipped the ears on first, taking the time to make sure they were secure since he’d wrestled Izuku into putting product into his hair earlier. Next was the collar, but rather than telling Izuku to raise his head, he instead lifted it with his foot. Izuku’s skin flushed such a pretty pink. Katsuki looped the leather around the unblemished skin of his throat. He grabbed the metal tag, pulling Izuku closer so he could rub his thumb over the inscription on the front.
“This tag is proof that you’re my little puppy, aren’t you Izu?” Katsuki asked, his nail tapping against the metal. He smirked when Izuku nodded desperately. “You’re usually such a good, perfect boy for me. But you were naughty today, acting out in public like that. And we both know that bad boys get punished, don’t they?”
Izuku whimpered around the plug still in his mouth and nodded again, his shoulders hunching in shame. Katsuki dropped the tag and pulled the tail free, dropping it on the ground in front of him. “You’ll be prepping yourself for your tail today. Like you did before, I want you to put on a good show for me, Izu.”
Katsuki leaned to the side to grab the bottle of lube they’d started keeping in their side table. He tossed it at his pet, chuckling when he fumbled to catch it. Izuku gulped, but rose up onto his knees to turn himself around. Bending over the coffee table, he popped open the lube, pouring over two fingers. One hand grasped his left asscheek, pulling it to the side to give Katsuki a nice view of his hole.
He must have heard the shift of Katsuki’s clothes as he leaned in for a closer look. Katsuki could tell that Izuku was holding back, his movements airing just barely on the side of too fast. Two fingers circled his hole, but he stopped himself right before he tried to push them both in at once. One finger took over, pressing against his rim until it sank in past the first two knuckles. Katsuki groaned along with Izuku, loving the way his pup’s hole stretched around the intrusion.
The slow pump in and out lasted only a few moments before Katsuki spoke up. “Go ahead and add another, puppy.”
Izuku let out a relieved sigh, adding the second finger and roughly spreading himself open. Katsuki shook his head, but allowed him to go at the quicker pace. He was getting impatient himself, eager for what he had planned. It didn’t take long before Izuku was guiding the tip of the plug to his hole and sliding it inside. The tail flickered to life, perking up and swinging side to side as he turned back around.
Katsuki gazed down at his pup, taking in the faint pink lines along Izuku’s cheek from being pressed against the table. There was a noticeable sheen between his legs, and his tiny cock peeked out from under its hood. “Now that you’re all ready for me, I want you to give me another color.” Katsuki reclined against the couch again as Izuku confirmed he was still green. “Good boy. For your punishment, I’ll be watching you jerk off.” The adorable head tilt from his puppy almost made him reach out to pet through green curls. He resisted, continuing on and watching with glee as realization crossed Izuku’s face. “You’ll play with your pathetic cock until I deem you’ve made up for your bad behavior. Don’t you dare cum, or you’ll be sitting here all night while I have my own fun.”
Izuku’s knees began to twitch closer together, so Katsuki placed both his feet at their sides and spread his legs back open. His puppy was already looking up at him tearfully, but he nodded in understanding. Izuku shuffled so that his knees were far apart, showing off his hard cock. Katsuki watched with satisfaction as his pup pushed back the hood of his cock and took it between two fingers. Izuku shuddered at the touch, the arm holding the majority of his weight wobbling before he collected himself.
Katsuki smirked when he noticed that Izuku was going much slower than he was when he was prepping himself for his tail. The drag of his hand up and down his short length kept a sluggish but steady rhythm. The muscles in his thighs twitched every now and then, causing him to pause briefly before the motions started up again. “Aw, you really needed this, huh, baby? Needy pup just wanted a hand on your little dick to get you off.”
Katsuki reached up to loosen his tie as Izuku whimpered. He was well aware of how much his voice affected his pet. And because this was a punishment, he wanted to test Izuku’s limits. “Why don’t you go faster, huh? Give your body what it needs. You made such a fuss over it earlier.” More tears gathered at the corners of his puppy’s pretty eyes. The green of them gleamed under the light as he looked at Katsuki, silently begging to keep his pace. “Look at you, just a mutt who can’t even follow simple directions. Stroke yourself faster before I change my mind and leave you here to get myself off instead.”
A strangled whine rang through the room, but Izuku obeyed. He wasn’t going nearly as fast as Katsuki wanted, but it would do for now. Every now and then, his cock would slip from between his fingers. Izuku would whimper each time, quickly grasping his cock again before Katsuki could reprimand him. He could tell whenever Izuku got too close by how his tail would thrash back and forth before stopping. The blond watched all of it with glee, his boxers steadily gaining a wet spot as he grew more aroused.
Katsuki loved the sight of his puppy sat in front of him, desperate and teary-eyed. This strong, bulky man who could fuck Katsuki through the mattress without effort, reduced to a whimpering mess begging for his attention. However, this was a punishment, so he held back on giving Izuku the praise he knew he wanted. Katsuki loved to give it to him, to shower him in sweet nothings and caresses, but now was not the time.
Instead of indulging his pet with words, he lifted one arm from the back of the couch and trailed it down his body. With a cruel smirk, Katsuki undid the belt on his slacks and popped the button. Izuku was panting heavily, eyes locked onto Katuski’s crotch. His puppy’s hand never stopped; his eagerness to be good kept him going. Katsuki continued on, unzipping his pants and raising his hips so that they fell and pooled around his ankles. He didn’t remove his boxers, just slipped his hand inside to rub over his cock.
Izuku whined again, but like always, the increased speed of his wagging tail gave him away. Katsuki leaned further back, legs spread as far as they could go. It made the fabric of his underwear stretch across his thighs in a way that had them bulging slightly around the seams. His pup certainly enjoyed the view, chest rising and falling in rhythm with the rapid movements of his hand. Katsuki took the head of his cock between his knuckles and squeezed, groaning at the stimulation.
He knew that he was teasing Izuku. He could tell from the jerk of his hips, and the needy, frustrated noises he was making that his pet wanted to see Katsuki’s bare cock. Still Katsuki kept himself hidden behind his boxers until it was clear that Izuku was on the verge of breaking. Once he decided it was time for the grand finale, he took his hand off his cock and sucked his own arousal off his fingers. Katsuki smirked as he closed his legs, Izuku’s eyes still staring at his crotch longingly while his tail slowly swished behind him.
Katsuki stood from the couch and shimmed his slacks back up his legs. He didn’t bother buttoning his shirt, just grabbed his belt and approached his whimpering pet. “Izu.” He watched Izuku’s spine straighten, tear-streaked face tilting to stare up at him. His palm fit around Izuku’s throat to ensure he couldn’t look away. “ Stay . Keep stroking, baby, and I’ll be back in just a minute.” Knowing his pup would get into his head if he saw Katuski stalk off to the bedroom without warning, he tacked on the reassurance. He waited until Izuku gave him a shaky nod, then stepped back. Katsuki made sure that Izuku’s hand was still on his cock before he turned and left.
He wasted no time finding what he needed. A pristine pair of leather dress shoes that had yet to be worn. The perfect cherry on top for his pet’s punishment. Katsuki made quick work of sliding his feet into the loafers, tucking the laces inside to spare them from what was sure to come.
When he got back to the living room, Izuku had sunk back onto his heels, tail half-curled around him. Pride bloomed in Katsuki’s chest when he saw that, despite his slower pace, Izuku was still stroking. He seemed to perk up when he noticed Katsuki had returned, tail wagging so fast it made his whole body vibrate. “Were you a good boy while I was gone?” Katsuki asked, hooking a finger into the D-ring on his puppy’s collar. Izuku’s tail thumped against the floor as he barked, the sound sending a delicious thrill down Katsuki’s spine. Fuck, he loved when his pet used his voice like that. “Hm, you have been well-behaved since we got back. But I think one last thing is in order.”
Katsuki dragged Izuku over to the couch by the collar. He sat down in the same spot as earlier, though this time closer to the edge. Urging his pet to stand, he leaned over so that he could get a good grip on the other’s hips. Katsuki subtly moved his foot out as he guided Izuku back down. Izuku jolted when his cock came into contact with the cool leather, his face scrunched up in confusion.
“Alright, puppy. For the last part of your punishment, you’re going to get yourself off using my shoe. I hope my mutt got himself nice and worked up, because this is the only way you’re allowed to cum tonight.” Katsuki grinned at the way Izuku’s eyes grew wide, his pupils blown until only the tiniest sliver of green was left. “Ready, Izu? Begin.”
Izuku rocked forward, his arms wrapping themselves around Katsuki’s calf to keep himself steady. He made the prettiest little whimpers as he dragged his cock against the hard leather. Katsuki could feel himself leaking just imagining the sheen that was no doubt left behind with every grind. “Just look at you, humping my foot like a dog.” He threaded his fingers through green locks and tugged, wanting a nice view of Izuku’s face as he fell apart. “But that’s exactly what you are, isn’t it, Izu? You’re Master’s pathetic little puppy, just a dumb, horny thing who’ll get off using anything I give you.”
Tears dripped down Izuku’s face, clearly overwhelmed from the onslaught of degrading words that Katsuki threw at him, and yet he just rocked down harder and faster. “Bet you wish it was my dick you were grinding your cute little cock against, huh?” Katsuki grinned cruelly at the desperate moan that left his pet’s lips. “That’s too bad. Only good boys get to breed their Owners, and you were so naughty at the event tonight. A shame, really.” He sighed and shook his head. “You should be grateful I’m letting you cum at all.”
Izuku broke into a series of broken whines, his hips jerkily moving across Katsuki’s shoe. Katsuki cooed at him, tugging at his hair again. “You wanna cum, puppy? Wanna cream yourself all over my shoe like the greedy mutt you are?” His pet shuddered, tail knocking into the legs of the coffee table. Glistening eyes turned up to him pleadingly. Izuku alternated between harsh whimpers and soft barks, begging in that sweet way that made Katsuki’s cock throb with want.
He watched as Izuku became more desperate, able to feel the weight of each grind press down on him through the thick leather. When it looked like his puppy was about to tip over the edge, Katsuki flexed his foot upward. “Okay, pup. I think you’ve suffered enough. Go ahead and cum, baby.” Katsuki groaned as Izuku came with a strangled scream, hunching over his lap even with the firm grip still in his hair. “That’s it, good boy. Fuck , Izu. So pretty, puppy. My sweet boy, you were perfect.” When Izuku’s hips finally stopped moving, Katsuki pulled him up onto his lap. Strong thighs wrapped around his waist as a tear and drool stained face shoved into the crook of his neck. Katsuki scratched along Izuku’s scalp, rocking him back and forth as his palm pressed him closer.
Katsuki’s own arousal was ignored as he soothed his pet after his punishment. He wasn’t sure if Izuku would want to do anything else tonight after the emotional high he likely just went through. So really it was Katsuki’s fault for forgetting what had gotten them into this situation to begin with—Izuku’s insane fucking libido. The hand snaking down to squeeze his ass was enough of a distraction that he didn’t even feel the other sliding up his thigh until there were deft fingers rubbing over his dick.
He lurched forward, nearly sending them both toppling off the couch. Dull teeth nipped the lobe of his ear, this time making Katsuki collapse backwards instead. The soft fur of his puppy’s tail brushed along his knees as Izuku raised himself up to find a better angle to jerk Katsuki off.
“Shit, baby.” Katsuki tightened his grip on Izuku’s hair. “Can’t keep your hands to yourself, can you?” The hand over his dick started working him faster, and Katsuki swore. His hips jumped up as much as they could with a lap full of the 200-something pounds of muscle that was his fiancé.
After the show Izuku put on, it didn’t take long for Katsuki to reach the edge. Two fingers squeezed the head of his cock, and Katsuki lost it. He came with a strangled cry, the sound muffled from where his face was shoved into Izuku’s neck. His pet kept working him through the high until he finally garnered the strength to push the hand away.
“God, Izu. Fuck, that was so good, you were amazing.” He shifted them both until Izuku was once again properly in his lap. “Such a good boy, pleasing me so well.” Katsuki's hands slid up Izuku’s body, steadying him and leaning him back enough so that they were eye to eye. He cupped his face, thumbs swiping over the dried tear tracks decorating his ruddy cheeks. The watery smile on Izuku’s face was the final straw for Katsuki. With hands holding the other in place, Katsuki peppered kisses across every inch of freckled skin he could reach.
Each peck drew a giggle out of Izuku until he was shaking with them. Katsuki pulled back so he could watch the crinkle of Izuku’s eyes as he laughed. Still giggling, he surged forward to capture Katsuki’s lips. The kiss was messy, even with neither of them trying to make it deeper. Eventually, Katsuki managed to kick off the ruined dress shoes and swing his legs up onto the couch so they could lie down. Izuku shuffled down so his ear was pressed against Katsuki’s chest.
As he played with the curls that had broken free of the gel from earlier, Katsuki made a mental list of all the things that would need to be done before they went to bed. Once Izuku was fully out of subspace, they’d take off his gear and put it aside for cleaning in the morning. It’ll be a bitch to get the cum off the leather shoes, but like hell would Katsuki only sacrifice them for one night . He pushed that thought from his head, he didn’t need to give Izuku an excuse to go another round.
His mind drifted back to the man in question. Katsuki pushed the hair off Izuku’s forehead, craning his neck down to leave a kiss there. “You feeling okay, Izu?”
Izuku still had a bit of a hazy look in his eyes, but he nodded before dropping his face back to Katsuki’s chest. He rubbed his face over the space where his skin was exposed, sighing contently. Katsuki snorted and started to lightly scratch up and down his fiancé’s back. The thrill of getting to discipline his typically well-trained pup had melted away. Now, it was replaced with the soft, unhurried pleasure of indulging in the current moment. With Izuku still obviously under, everything else could be dealt with later. Besides, he’d much rather continue to lie here with his partner like this.