Be a good boy - Chapter 4 [NSFW]

It was Iida's idea, of course, that made Izuku laugh like an idiot at Katsuki's misfortune. In the top left-most corner of their classroom blackboard was drawn a little box. Originally he had labelled it simply “Bakugou” but that had only lasted five minutes before Ashido had shoved him aside. “Bakugou's Bad Boy Box” was her suggestion, which Izuku whole-heartedly voted for, but it had been soundly outvoted in favour of shortening it to the BakuBox.

Inside the BakuBox, every time he swore, someone drew another line. By the end of the day they had a visual tally of how many times he'd slipped up – which made Izuku's job back at the dorms significantly easier.

It took a while for anyone outside of the class members to notice it there, sitting out of the way in the corner of the board, flying under the radar until the first time he slipped in the middle of a class. There was an immediate chorus of groans that flooded the room, Aizawa looking dumbfounded in response, and then solemnly Iida approached the board to make the first tally for the day.

Aizawa hadn't asked questions about it, but he and most of the other teachers began to neatly step aside any time Katsuki swore in class, so no one was stupid enough to think they hadn't caught on.

Today, the BakuBox was up to seven. Not his best score for a day, but by no means his worst, either. He had a very painful memory of a twenty-three burned into his brain, after all. When Aizawa dismissed them and left, Izuku leaned forward and muttered in Katsuki's ear, getting a flush and a pleading look in return. Quickly he pulled his phone out and shot a message to Iida, grinning at him across the room as he turned his phone on, and after a moment Iida met his gaze. He stepped up to the front of the room with a nod, waving for Katsuki to join him, and with his face burning crimson he obeyed.

Taking a marker from the teacher's desk, Iida marked a large “7” on the back of Katsuki's hand, and when Izuku gestured pointedly he held it up to the class, his eyes staying on his shoes.

“You're getting better, Bakugou!” Iida praised him kindly. “We'll keep working to help you, we’re very proud!”

The digit stayed there for the rest of the night, bold and dark against his skin, right where it caught the corner of his eye no matter where he looked. He wanted to stuff it in his pocket and hide it, but he knew Izuku would never let him get away with it, so instead he finished his day with the stupid number laughing at him.

“Hands on the wall,” Izuku instructed needlessly, as he closed the door behind them. “How many times, Kacchan?”

“Seven,” he mumbled, looking to his hand. “Sir.”

“Count for me.”

He yanked Katsuki's pants down to the floor and slapped a hand down on soft flesh, still stained pink from the previous day's encounter.

“One, Sir.”

He brought it down again in the same spot, spreading the red flush from his hand wider across the cheek.

“Two, Sir.”

As they continued Katsuki's voice got a little more choked up, until finally they reached a spluttered seven.

“Good boy,” Izuku praised him, taking the hand marred with ink. “Let's get this off now.”

He pulled a bottle of hand sanitiser from the drawer and dumped some on the ink, taking a tissue to rub it away. It didn't take long to remove, not even a stain left behind, and Izuku kissed it lightly before he threw the tissue away.

“You're getting much better, Kacchan. I'm glad to see you improving.”

“Thank you, Sir.”

“You're going to be such a good boy for me, aren't you?”

“Yes, Sir.”

“Come here, sweetie.”

He pulled Katsuki into his lap, caressing his hair and cheeks lightly and watching him soften a little under the touch. For a moment they parted so Izuku could rid him of his t-shirt, then his hands were exploring again with the kindest touch.

“You're such a handsome boy, Kacchan,” Izuku cooed, rubbing at strong pectoral muscles. “I'm so, so lucky to have you, pet. Aren't I so lucky?”

“Thank you for having me, Sir.”

“Such a good boy.”

“Even though I swore seven times?”

“Shhh, it's forgotten now baby. You've had your spanking and now we start fresh, okay? Don't dwell on past mistakes.”

“Yeah. Um, sorry. Sir.”

“It's okay. I believe in you, Kacchan, you know that don't you?”

“Yes, Sir.”

“So good. I'm gonna give you a reward for being so good, would you like that?”

“Yes, Sir, if you think I... I...”

“You what, Kacchan?”

“Deserve it,” he mumbled, blushing again. “If you think I deserve it.”

“I do,” Izuku nodded, then leaned in to kiss his neck. “You're being so good for me tonight.”

“Thank you, Sir.”

“Such a polite little pet,” Izuku cooed, smirking when he felt the bulge rub against his thigh. “I'm even going to let you have a choice, baby.”

“A choice?”

“Would you like to get me off with your hand or your mouth?”

Katsuki's stomach flipped. He had finally gotten used to Izuku telling him what to do, shoving him into place, ordering him around. He'd never expected to have to pick it for himself.

Was 'none' a valid option? No, he doubted it.

Did he want to pick none? No, he doubted it.

Honestly, he wasn't sure it was a question at all. He was sure 'hand' would be the wrong answer – that was too easy. Hand would bring another punishment for not sufficiently worshipping his Master's body like a good boy should.

“My mouth, Sir,” he said finally, struggling to keep from looking away. “Please.”

“Mmm, that sounds perfect, Kacchan. Get down on your knees for me, I want to see you.”

He slid out of Izuku's lap and kneeled on the floor, looking up with nervous eyes as Izuku unzipped his fly and pulled his cock out.

“Are you going to swallow for me, Kacchan?”

That one was definitely a trick. He knew it wasn't really a question.

“Yes, Sir,” he cringed a little but nodded. “If that's what Sir wants.”

“That sounds perfect, Kacchan. You can get started when you're ready.”

He opened his mouth and stuck out his tongue, lapping at Izuku's swollen head for a moment before he took it in his mouth. It was a familiar task now, with how many times he'd found himself on his knees recently, and he no longer had to think too hard as he steadied his breathing and sunk down lower, slowly edging toward the base.

Izuku's hand was tangled in blond hair, and a small part of Katsuki feared he would pull at any moment, would make Katsuki choke on his cock. He did his best to relax, to prepare for it, but Izuku's hand just combed lazily through the spiky locks, humming contentedly.

Katsuki risked a look up, immediately meeting emerald eyes that were staring down at him happily, and blushing when Izuku gave him a little smile.

He shouldn't be enjoying this. Really, he shouldn't. It was nasty, it was gross, it was...

It was kind of great.

He closed his eyes as he sank right to the base, swallowing hard around the beautiful shaft and moaning when he felt it twitch inside him.

“Good boy, Kacchan,” Izuku praised again, holding the back of his head lightly to encourage him to stay. “That's perfect, pet. You feel amazing.”

He moaned again when he started to pull back, his mouth suddenly so empty without it, and quickly he was thrusting his head forward again, filling himself up.

“Oh Kacchan,” Izuku sighed breathlessly, his head thrown back. “Keep going just like that, baby.”

He kept going at the same steady pace, pulling back slowly then filling himself up again in a hurry, until Izuku's fingers became a little more demanding, pulling him forward when he started to move back. It made more sense when Izuku's fluid shot into him, Katsuki struggling to keep from coughing when it hit the back of his throat. He swallowed valiantly until Izuku loosed his grip, and Katsuki slid off in a hurry, doing his best to keep it all in his mouth. He knew if he spilled any he would be told to lick it up, and Katsuki had learned that lesson one too many times already.

“Come up here, Kacchan.”

He obediently climbed up on the bed again, a warm palm immediately moving to his erection, rubbing at it roughly.

“It's your turn now, Kacchan. I'm going to finger you and you're going to be a good boy and not cum until I say so. Do you understand?”

“Yes, Sir.”

“Good boy.”

─────

Ashido leapt up and ran to the board, drawing a line in a little box in the top left corner. Katsuki flooded red when everyone groaned, and Izuku looked over with surprise.

“You were doing so good, Bakugou!” Kaminari whined. “It's almost the end of class!”

“I don't care, shut up,” he insisted, flustered. “It doesn't matter, whatever.”

Despite the words, he kept his head down for the rest of class, carefully avoiding everyone who looked his way. Even Aizawa shot him a look at one point, checking up on him, but Katsuki forced himself to meet those eyes, to make it clear he was fine despite his embarrassment.

He dared Aizawa to question him, with that look. Katsuki was a hero, after all – a winner. There was nothing that could stop him from getting what he wanted, including a stupid board of teachers who thought he should be kicked out of their school.

As he stood at the front of the class, letting Iida draw the stupid one on his hand as a reminder, he stared his classmates down, eyes narrowed.

Watch me.

He was gonna show those assholes what a real hero looked like.