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It all started one random afternoon. You were in the common room of Bakugou's class dorms, lounging on the couch with Bakugou after a long day of classes.

You had a bit of free time on your shoulders, so why not spend the day with Bakugou?

The sun was setting, casting a golden glow over the room. As you scrolled through your phone, you couldn't help but throw a little playful jab at Bakugou.

"You're such a perfectionist, you know that right?" you teased, your voice dripping with humor. "Lighten up a little, won't you?"

Bakugou, who was sitting next to you with his arms crossed, turned his head slowly, raising an eyebrow at your comment. Then, in a move that absolutely blindsided you, he rolled his eyes dramatically, mocking you.

"Oh, I'm soooo sorry, Your fucking Highness," he said, his voice dripping with exaggerated sarcasm. "Should I just stop being perfect because you can't keep up?"

Your eyes widened in shock. "Did you just-"

He rolled his eyes again, even more dramatically this time, mimicking your earlier actions. "Oh my god, I'm sooo sorry, how will I ever survive without your approval," he continued, his voice going a few octaves higher as he waved his hand in the air, pretending to be flustered.

You gasped, unable to believe what you were hearing. Bakugou? Being sassy? You burst out laughing, clutching your stomach. "Oh my god, who are you, and what did you do with Kat'ski?"

He smirked, clearly satisfied with his performance. "What? You can dish it out, but you can't take it?" he said, his tone still holding that sassy edge.

From that moment on, it was as if a new version of Bakugou had been unlocked, a sassier, more dramatic version. And you had no idea how to handle it.

▬▬▬

The next day, you were hanging out with Bakugou in your dorm's kitchen as he cooked up dinner for the both of you. You were leaning against the counter, chatting away about your day, when you mentioned how much homework you had to do that night.

"I've got so much to do, I don't even know where to start," you said, sighing dramatically.

Without missing a beat, Bakugou shot you a sideways glance and said, "Maybe start by doing the actual work instead of whining about it?"

You blinked, caught off guard. "Excuse me?"

He smirked, stirring the pot of stew in front of him. "What? Did I stutter?"

Your jaw dropped. "Kat'ski!"

"What?" he said, shrugging, the sass practically dripping off him. "I'm just saying. You talk a big game, but your 'study sessions' are just you watching videos on your phone."

You opened your mouth to respond, but nothing came out. You couldn't believe this was happening again. This sass-master version of Bakugou was here to stay, and you didn't know whether to laugh or cry.

Maybe both.

▬▬▬

Later that week, you two were walking to the gym, preparing for a training session. Bakugou was ahead of you, but as you jogged to catch up, you tripped slightly over your shoelace. It wasn't a big deal, but Bakugou noticed and immediately made it one.

"Well, well, well," he said, stopping to turn around with his hands on his hips. "Look who can't even walk straight. Should I carry you, Princess?"

You glared at him, brushing yourself off. "I'm fine, thanks."

He tilted his head dramatically and placed his hand over his heart. "Oh, poor baby, struggling to keep up with little ol' me. How tragic."

You shot him a look of disbelief, unable to suppress your laughter. "Are you serious right now?"

He walked up to you, leaning in closer with a smirk. "Completely. You want me to slow down for you or do you want to get your act together?"

You couldn't even respond, the sass was so thick in the air. This was a whole new level of Bakugou, and honestly, it was kind of hilarious.

▬▬▬

Then there was the time you were out shopping together, and you held up a cute outfit for him to look at. "What do you think? Does this look good on me?"

Bakugou raised an eyebrow, eyeing the outfit before crossing his arms. "I don't know. Does it?"

You blinked. "That's why I'm asking you."

He tilted his head to the side and put a hand on his chin, pretending to ponder. "Hmm, maybe if you weren't wearing those busted shoes with it, it might work."

You gasped, glancing down at your sneakers. "What's wrong with my shoes?"

He smirked. "Nothing, if you were planning on time traveling back to 2010."

Your jaw dropped. "Excuse me?"

He chuckled, clearly enjoying your reaction. "I'm just saying, if you're gonna rock an outfit, at least commit to it."

This bastard...

▬▬▬

One evening, after a particularly long day of training, you decided to flop down on Bakugou's bed, next to him. He was already there, scrolling through his phone with a bored expression.

You sighed dramatically, letting your head fall back. "I'm so tired."

Bakugou glanced at you out of the corner of his eye, his lips quirking into a smirk. "Aw, poor thing. Maybe if you weren't such a weakling, you wouldn't be."

You sat up and glared at him. "What is with you lately?"

He raised an eyebrow and shrugged. "What? I'm just telling the truth. Maybe if you hit the gym more, you'd be able to keep up with me."

You narrowed your eyes, feeling your own sass bubble up in response. "Oh, I can keep up with you just fine, thank you very much."

He snorted, leaning back on the bed with a smirk. "Sure, sure. Keep telling yourself that."

▬▬▬

It wasn't just the little quips, either. Bakugou had fully embraced his sassy side, and every now and then, he would catch you off guard with some comment or another. From rolling his eyes at you to giving you attitude about the most random things, it became a regular part of your daily interactions.

But as annoying as it was sometimes, you couldn't help but find it hilarious. The once-stoic, intense Bakugou was now a full-on sass master, and while it took some getting used to, you had to admit, it made your days a lot more entertaining.

And in a weird way, his sass was just another way for him to show how comfortable he was with you.

He only teased the people he cared about, and though he'd never say it outright, you knew that this was his way of letting you into his world.

One day, after another particularly sassy comment, you finally confronted him. "Katsuki, seriously, when did you become so sassy?"

He shrugged, looking at you with a smirk. "Maybe I'm just a reflection of you."

You laughed, shaking your head. "I don't know if I should be flattered or insulted."

He leaned in, brushing a strand of hair from your face. "Flattered. Definitely flattered."

And with that, the sassy apocalypse continued.