Be a good boy - Chapter 3 [NSFW]

“You remember the other day when you were in a bit of a mood and wanted to play longer?”

“Yeah.”

“Well today I'm in one of those moods,” Izuku smirked, biting at Katsuki's neck lightly. “So after class, we're gonna play.”

“Okay.”

“Do you know what this is?”

He held up a smooth white object, and Katsuki shook his head.

“Let's see how long it takes you to guess.”

He drenched it from the bottle of lube and immediately saw Katsuki's face flood red, before he'd even reached between their legs. In his position straddling Izuku's lap he had unknowingly put himself in exactly the right spot, and he shuddered as it touched his entrance.

“Relax for me, Kacchan, or it's gonna be a tight fit. You can lean on me.”

He rested his hands on Izuku's shoulders, leaning in a little for support, gasping for air as the device slid inside him. It was a weird feeling – not long enough to feel like a penis, but too wide to feel like fingers. The flared base kept it in place even when he moved a little to test it, and he could see Izuku getting hard in his jumpsuit.

“Would you like me to deal with that before we go, Sir?” Katsuki asked sweetly, a hint of a smirk creeping into his smile.

“Don't be silly, we'd be here all day,” Izuku grinned. “Trust me, it'll still be there when we get back.”

He finally let Katsuki get up and dress himself, making sure the plug was secure still at every step, and as he watched, Izuku was tempted to take back his words and fuck him on the spot.

“One more thing,” he added, as they started to leave the room, “I forgot to mention it.”

“Huh?”

“No bad language today, okay? No swearing, no insults, nothing.”

“I'll try.”

“Every time I hear it...” Izuku produced a tiny remote from his pocket. “This happens.”

Katsuki practically jumped out of his skin, flooding red again, and Izuku smirked.

“Did I not mention that when I showed it to you?”

“You little bi-”

He was cut off by another push of the button, the plug in his ass vibrating so hard he could swear people would hear it from the next room, but all he could see was Izuku's smirk.

“Looks like I got it in the right spot,” Izuku smiled, planting a kiss on Katsuki's cheek. “You gonna be good today, then?”

“Yes, Sir.”

He followed awkwardly as Izuku made the walk to class, the smooth silicone brushing at his prostate with every step, but the damn nerd acted like nothing was out of place. He smiled and waved at the people they passed, stopped to pat stray cats, even paused for a while to chat with someone from another class, all while Katsuki sulked behind him, waiting silently for him to finish. At least the thing stayed still, though, didn’t send vibrations up his damn spine and make him forget how to function.

There was a strange sense of relief that washed through him when he sat down at his desk, finding a position to sit comfortably and refusing to move again. If his teachers dared to ask them to stand up and read aloud or do some kind of group activity he might just riot. Then again, rioting would probably make Izuku pull out the damn remote, and he had no doubt that that would be significantly worse than just standing up.

He watched in disbelief as Izuku walked up to the front of the class, brimming with confidence as he smiled at his classmates and clapped his hands lightly. The whole class turned to look, and Izuku just grinned a little wider, eyes squinting to make room for it.

“Thanks for listening, everyone! I just have something quick to say!” He grinned at Katsuki as he spoke, getting a nervous look in return. “Kacchan told me yesterday that was he wants to try to stop swearing, and I know he's embarrassed to tell you himself, but I thought we could all share in helping him out! So if you hear him swearing, please make sure to point it out and remind him so he can break the habit! Let’s help support him!”

Katsuki looked ready to kill Izuku when everyone turned his way to stare, waiting for the cursing and yelling that would tell them Izuku was making it up or something, but to their disbelief, it didn’t come. Izuku shot him a sweet little wink and skipped to his desk, grinning as people immediately began to bombard them with questions.

“What made you decide, Bakugou?” Iida asked, strangely kindly. “I think it's a very mature decision.”

“It's nothing, it's stupid,” Katsuki mumbled, blushing. “It's not a big deal, don't worry about it.”

“Well, I'll be supporting you the whole way.”

“Ugh.”

“Kacchan,” Izuku warned him, “don't act like that.”

“Yeah, yeah. Thanks, or whatever, Iida.”

Iida seemed surprised to hear his actual name come from Katsuki’s lips, but he smiled all the same, giving him a quick nod of approval before he turned his attention back to his books. As embarrassing as it was, it was almost nice to see the way they all smiled when he was less rude to them – he’d gotten so used to just being the brash asshole all his life, he’d never really thought about how it might feel to not be.

Maybe one day he’d admit to them all the real motives for his changes – the expulsion, of course, not the vibrating butt plug – but for now he was just going to have to put up with the teasing and the overzealous enthusiasm for his efforts to better himself.

And honestly... Maybe they weren’t wrong. Katsuki was man enough to admit that maybe, just maybe, if so many people wanted him to change something as small as they way he talked, there might be some merit behind it. He wasn’t going to gel his hair flat and wear stupid jeans like Jeanist’s ridiculous standards, but maybe it wouldn’t be so bad to cool it with the yelling and insults. Aizawa hadn’t disagreed with the rest of them, after all, and he usually put some weight into Aizawa’s opinions.

“Everything okay, Kacchan?” Izuku asked with a smile, leaning back to see the contemplative look on his face. “You’re doing a good job.”

“Fine,” Katsuki huffed, looking away awkwardly. “Everything is... Fine.”

“I’m glad.”

─────

Izuku grinned when he heard Sero teasing, trying so hard to get a curse out of the poor guy. Katsuki was putting up a valiant effort, his face burning red as he tried not to react, Kaminari and Ashido only egging it on.

“You're supposed to be my friends,” Katsuki whined, almost pitifully. “Why do you have to do this to me? Come on, man.”

“Aww, wittle Katsuki getting upset? Poor bubby. Need a bottle of milk?”

“Seriously dude, shut it.”

“Does baby need a hug?”

“Fuck off.”

“Got it!” Sero announced triumphantly, throwing his hands in the air. “Nailed it! I win!”

“Not funny, asshole.”

“Does that count? That counts, right?”

“No, that doesn't fucking count.”

“That's two!”

“I don't know why I'm friends with you.”

Half the class seemed to have turned Katsuki’s plight into a game. Katsuki was always so stubborn about winning, after all – it took a lot of teasing and tormenting to finally break him, a massive test of his willpower versus his need to fight back.

Katsuki hissed when he felt the jolt shoot through his ass, clenching around it and biting down on his lip firmly to keep from letting out any noise. His friends didn’t seem to notice, mistaking it for seething about his loss, but that was just the way Katsuki – and Izuku – liked it. It was their little secret, after all – a private game for the couple to play, not something to share with the class.

It wasn’t until they got back to Izuku’s bedroom that he finally let it out, and Izuku just watched patiently as Katsuki fumed, trying his damnedest to cuss Izuku out without actually swearing. The moment he got too close to a rude word, Izuku hit his button, and Katsuki stopped mid-sentence, hissing as he fell against the wall.

“How many times, Kacchan?” Izuku prompted. “How many times did you yell or swear?”

“I don’t know,” he groaned, the buzzing in his ass refusing to cease as Izuku waited patiently, holding down the button. “Five?”

“Is that an answer or a question?”

“An- Ffff- An answer,” Katsuki grimaced, contorting as he searched for a position that would offer him some relief. “Two to Ta-Tapeface, one to Raccoon Eyes, and t-two to Pikachu.”

“Now with their real names, Kacchan.”

Katsuki whined, and Izuku turned the settings up a little higher, the plug pulsing quicker within him.

“Sero,” he grunted, cringing. “Mina. K-Kaminari.”

“Good boy.”

The buzzing finally stopped, and Katsuki slid down the wall to sit on the carpet, chest heaving as he tried desperately to get his breath back. Izuku just watched with fascination  as Katsuki wiped sweat from his forehead, breathing heavily, his body finally slumping as he curled in on himself in relief.

“You came,” he said flatly, when he saw the wet patch on Katsuki’s trousers. “Holy shit.”

“Like you didn’t expect that,” Katsuki huffed, ears bright pink despite the way he tried to hide his blush in his knees. “You know I get off on the anal shit.”

“I’m impressed,” Izuku grinned. “I didn’t think it would be that easy.”

“Shut up.”

Izuku knelt down, gently slipping off Katsuki’s soiled pants and underwear, and Katsuki shifted a little to allow it, finally letting Izuku see the cute little blush on his cheeks. Katsuki was oddly modest when it came to sex, Izuku had always found it adorable.

He gently cleaned up the mess, then reached for Katsuki’s collar, always sitting in wait on the top of his drawers. He snapped it around Katsuki's throat, watching gleefully as Katsuki stretched his neck out to let it settle, just like he always did.

“Comfy?”

“As much as it'll ever be.”

“Want to try that again?”

“Yes, Sir, it's comfortable. Thank you.”

“Good boy.”

Finally he pulled Katsuki’s shirt off, and he scooped him up, carrying him over to the bed to get him comfortable on the sheets. He leaned in, kissing Katsuki’s warm cheek, and smiled as he pulled the plug out carefully.

“Feeling okay?”

“Mm-hm.”

“Tired?”

“Yeah.”

“Too tired for me to fuck you?”

Katsuki snorted, shaking his head faintly as he got comfortable on his pillow.

“Nah,” he smiled faintly. “Never too tired for that, Sir.”

“Good answer.”