Title: Excess Ability (Plus Ultra)
Author: Timothy Wren
Fandom: Boku no Hero Academia
Relationship: Bakugou Katsuki/Midoriya Izuku
Warnings: Extremely dubious consent, mentions of somno-noncon (offscreen, fantasy/plan), puppy play, teddy bear fucking, dom/sub, established relationship dynamic, cock cages. Very dark; dark! Deku.
Actually, this could be very consensual with the kink negotiated off-screen, it’s up to interpretation (aside from the Inko mention, which could just be a dark fantasy).
Word Count: 2314 (complete)
Summary: He was only ever Katsuki like this, not Kacchan.
Whenever classes were over and it was almost curfew, Deku came into the room and said, “I’m glad we live in the dorms now, it makes it easier to see you every night. Heel, Katsuki.”
He was only ever Katsuki like this, not Kacchan. Gulping, Katsuki slid out of his desk chair and to his knees, where he crawled over to Deku and sat down in front of him.
“Good boy, Katsuki,” Deku said in a childish voice, ruffling Katsuki’s hair. Katsuki swallowed. Deku fastened on Katsuki’s collar and then clicked on the leash from his pocket.
“Let’s get those people-clothes off you, puppy. What do you say?”
Katsuki opened his mouth and after a few moments was able to manage a weak bark. Deku waited patiently, then smiled.
In short order, Katsuki was folding his shirt and pants in a small pile next to him. The leash made it annoying– he couldn’t pull on it, or even take his shirt off over his head, but it was a button-up anyway– and he hesitated at his boxers.
“Yes, those too, puppy,” Deku said, a warning in his voice. Katsuki’s hands shook a little but he pulled them down, revealing the glint of metal keeping his cock small and caged.
His balls were obscenely big under the little cage, dwarfing it further.
“Let’s put in your tail, Katsuki. I think we can do without the paws today since there are only forty minutes until curfew. Why don’t you go pick out a tail?”
He lead Katsuki on the leash over to the bedside table and Katsuki had to pull the bottom drawer open with his teeth. He stuck his face in and came out with a mouthful of silicone.
He turned to see Deku palming himself, lazy-eyed, through his pajama pants. He shuddered and spat the toy out at the green-haired fucker’s feet.
“Oh, this one? Okay, if you’re sure.” Deku was in the kind of mood that if Katsuki had picked a smaller one, he’d have ended up with the very largest, so picking a more middling plug was smartest.
“Alright puppy, hop on the bed. Hop up! There’s a good boy.” Katsuki’s cheeks burned more for the tone of voice than the position though that didn’t help. He got on his hands and knees on the bed, legs spread wide to accommodate Deku, whose hands were on his ass in short order.
Deku groaned as he slid a slick finger into Katsuki’s ass; Katsuki grunted, unprepared. He hadn’t heard the lube bottle popping open, shifted restlessly in surprise.
One finger turned into two and then it was a scissoring stretch. Katsuki caught himself rocking back into the fingerfuck and growled at himself, forcing his hips still.
Deku laughed, delighted.
“You make such a good dog, Katsuki.” Katsuki’s face burned with humiliation. Deku pulled out after only a few more minutes of purposefully stimulating Katsuki’s prostate, trying to make him fuck back on his fingers again, but Katsuki wouldn’t allow himself the weakness.
“Fine.” Deku sighed as he gave up. The clink of the lube cap and then something blunt pressing into him; Katsuki bared his teeth and bore down on the plug as it spread him wide. His legs shook.
Finally, it was seated within him and he could feel the brush of fur against his cheeks. Deku tugged on his tail teasingly, letting it dangle and move back and forth, his breath hitching.
“Shake your tail for me, Katsuki,” He said.
Katsuki slowly, grudgingly complied. Deku slapped his cheek, the sound ringing out; he yelped, squeezing down tight on the base of the toy. The fabric tail shivered.
Deku sighed again. “I guess that’s good enough. Does puppy want to go for a walk?”
Deku led him around his dorm room in slow circles, seemingly just for the hell of it.
“That’s the downside to the dorms I guess. At home, I could walk you through the living room while your parents were asleep, take you around and make you bark through the house, but there’s cameras in the hallway now.”
Katsuki was thankful for it.
“Okay, buddy, how about a treat?” Katsuki barked warily, because it was rarely a treat for him.
“You’ve been a very good dog for me tonight.” The nerd continued. He went to the closet and opened it. Katsuki’s pulse started to race, cock painfully trying to fill against its metal prison.
“That’s right boy, I’m going to let you play with your toy. Say thank you, Katsuki.”
Katsuki barked twice, face a bright red. He wasn’t fucking eager for this. His eyes tracked the furry thing Deku dragged out of his closet.
It was an overlarge teddy bear, one of those person-sized things you won at carnivals. The special thing about this bear became obvious once Deku laid it on the ground. With its backside up in the air, pink color was visible at its crotch.
Katsuki could feel his pulse speeding up against his will.
“Come on, Katsuki. Mount.” Deku tugged lightly on the leash and Katsuki crawled over to the back end of the bear, trying to get his heart rate under control.
“Mount.” Deku repeated, pulling up on the leash. Katsuki place both hands on either side of the bear and rose up against it.
“Good boy.” Deku said. Katsuki could feel his balls touching the soft material, his caged cock trapped against it. The fur brushed the sensitive inside of his thighs, and against his belly, too soft.
The sense memory had him shivering helplessly. He kept trying to get hard in the cage and it hurt. He bit back a whine behind his teeth.
“You know what this means, don’t you, puppy? There’s only one way puppy’s cage comes off and that’s when he’s breeding. Right, Katsuki? You want to breed your toy?”
Fucking the stupid teddy bear had become so tied up with his own orgasm that just seeing it made him break out into a cold sweat. For… far too long, now, the only way Katsuki came was with his face pressed into the teddy bear, rutting into it like an animal.
He stubbornly didn’t say anything, even though his legs were trembling, balls already tight at the feel of fur against them. His body knew what it meant that the bear was here.
“Well, I was going to give you some lube for your bitch, but if you’re going to be a stubborn boy…” He sighed like he was disappointed, but Katsuki saw the excited gleam in his eye.
“Lick your toy and get it all wet, puppy. Unless you think your little cocklet can leak enough on its own?”
He laughed and it wasn’t a kind laugh. He did however add insult to injury by fishing the key necklace out from under his shirt and bending down to unlock Katsuki’s cage.
In short order, it grew hard and dripping under him. His thighs shook, cock jumping with eagerness. He wanted to get off. It had been over a week. He couldn’t touch himself with the cage on and he couldn’t touch himself now; the only way to get relief was with the bear, fucking it on all fours like an animal, mindlessly humping with lust.
Deku watched and waited, humming, and Katsuki finally gave in. With the cage, he could at least pretend to resist, but now that his cock was free and right there, he needed to use it. He sank down until he could plunge his tongue into the silicone pocket pussy sewn into the bear.
“There you go, puppy, drool into your toy.”
Katsuki flushed all over with humiliation as he worked up enough spit to coat the lips of the toy and inside it, elbows on the ground. He wondered if this was how it felt to go down on a girl.
He worked his head, pushing saliva into it, wiggling his tongue into the hole that would soon take his cock. All the blood had rushed into it so fast that Katsuki was woozy, light-headed. His cock hung like a brand between his legs, hot and full, unignorable.
When Deku pulled up on his leash again, he was almost relieved. Katsuki whined.
“Okay, that’s enough,” Deku said. “Mount, Katsuki.”
Katsuki once again pulled himself up into doggy style with the giant bear. His elbows were on either side of its torso. His cock, hard, butted first against fur and then a bit of plastic, Katsuki having to use his hips to try to maneuver it. He whined again, stressed, humiliated, and just wanting his fucking reward already.
Deku sucked in air through his teeth, probably getting off on this. He moved around and suddenly Katsuki felt his body heat from close by. A hand closed around his painfully hard cock and Katsuki trembled. A warm, human hand, for the first time since…
“Let me line you up, puppy.” Katsuki couldn’t see, eyes blurred with tears for how embarrassing this was. Deku lining up his cock with the toy like he really was breeding it, and Deku his owner…
But then he couldn’t think because the painfully-flushed head of his cock pushed against the slobbery pussy lips of the toy, and sensation overwhelmed him. His hips slammed in before he could even think to savor the movement, and Deku pulled back with a laugh as Katsuki began the short, jerky thrusts that were all he could manage, thighs rubbing frantically against soft fur.
“This shouldn’t be so hot but it really is,” Deku said to himself, idly fondling his own cock.
Katuski’s tail jumped up and down with each frantic thrust as he humped into his toy, ass bouncing, erratic. He buried his face in the teddy bear’s back and whined through his teeth, over and over again, high-pitched, almost wounded noises.
“Such a good dog.” Deku marveled but Katsuki was beyond hearing. He’d been fucking Pavlov-ed into getting hard at the sight of the bear and early experiments where Deku only gave Katsuki three minutes to ‘finish’ had ensured he went right for the animalistic rutting Deku wanted to see.
Watching Katsuki hump a teddy bear like a dog, gleefully if not quite gratefully, was the best part about this for Deku. Puppy loved his toy, upper body locked, knees tight, ass the only thing moving as he frantically humped into it, red-flushed cock visible in glimpses only as it moved so fast in and out of vision.
Deku sometimes used the blow-up dildo, just to pump it bigger and bigger in Katsuki’s ass, until his puppy was whining and crying out yips, unsure if he wanted to focus on his little doggy prick or the fat knot swelling him open. His head would yank back, wailing back and forth with each cry, like he couldn’t stand it, tears streaming down his face as he miserably fucked into the bear, held close to his chest.
But Deku didn’t want him to get enured to that so it was for special occasions only. Sometimes he used a pump on Katsuki’s cock until it was red-red and sensitive and then let him fuck his toy, so that he winced with every thrust but like a dog, couldn’t help himself from rutting into the welcome hole anyway, panting and wincing and growling.
Over their next break, Deku planned to give his mom twice her usual dose of sleeping pills, and let his puppy mount a real bitch. He could already imagine the flushed red cock slamming wetly in and out of her hot little hole, stretched wide around him, as Katsuki whined and whined, pink and embarrassed but doing what Deku said, anyway, pert little ass mounted and flexing with thrusts so fast he was actually delaying his orgasm. Going slower would feel so much better but Deku had ensured every time he got to rut into something he was a slave to his own helpless pleasure. Over-eager and whining from the friction, he still couldn’t stop.
Today, though, Katsuki came in his toy like it was a race, hips still pumping frantically even as he spilled, burying his yips and keens into the teddy’s back. When his hips finally stilled from their humping, slick cock pulling out slowly from the pussy, it glistened in the light. Tears dotted the corner of Katsuki’s eyes.
He was certainly oversensitive, his cock having shrunken down from continuing to fuck in that state. He whistled and Katsuki clumsily untangled himself from his teddy bear and padded over, cock still bright red and half-hard under him.
“Sit up,” Deku commanded and Katsuki complied, sitting back on his heels presenting his tits out. His tail sat limply on the floor between his thighs.
Deku reached down and stroked his cock until he was wincing harshly, and it shrunk down further as if to get away from him. He smiled as Katsuki squirmed, then clipped the cage back on.
Rosy metal sat against his large balls, sweaty and wet, lewd in the comparison with his tiny cock that rested against them.
“What do we say?”
Katsuki barked weakly.
“You can say it with words for being such a good boy.”
“… Thank you,” Katsuki said quietly, his eyes barely managing a glare he was so tired.
“You’re welcome, Katuski,” Deku said, pleased. “Now why don’t you be a good boy and suck me off? I didn’t bring any peanut butter this time, but I know you love the taste, anyway.”
He pulled his cock out and let it dangle, large and unencumbered by any chastity device, in front if Katsuki’s sullen expression. He tangled one hand into blonde hair and guided him closer.
“Open wide, puppy. We’ve only got twenty minutes ’til curfew, and I’m not putting you to bed until I come down your pretty throat.”