Disclaimer: I don't own My Hero Academia and any of its characters used in this fanfic.

A/N: I'm late again with posting, but here's the fifth one-shot for Katsuyu Week 2018! The prompt for Day 5 is Flustered. (If any of you want to contribute, head on over to katsuyuweek on Tumblr to see the prompts, rules, and guidelines!)

This is another aged-up AU. I don't know what is it with me and aged-up AUs between Katsuki and Tsuyu lately these past few one-shots. I really don't know, but heck, this is what comes out of it when I'm writing, so I'll take it.

Also, fair warning: expect some coarse language (and mentions of other ships—if you know me and/or what I ship, then you know what ships I'm referring to).

With that said, enjoy!

Eventual

Day 5: Flustered

This wasn't good for Katsuki's heart. Or his mind. Or, well, anything, really. A part of him just wanted to smash whatever object he could find to bits, so he could simmer down, but a part of him doubted that it would work—because why did Tsuyu have to be so downright breathtaking in that little black dress?

More importantly, why did he show up here again to this stupid 10-year high school reunion at U.A.? Why did he bother, especially since they were all superheroes? Obviously, some of them couldn't make it, but the majority of everyone did, and he wasn't going to go until he heard Tsuyu was coming.

He really didn't know when his feelings for her started emerging. In fact, he only confirmed his feelings for her recently when he kept overhearing Denki talk constantly about what it was like to fall in love or crush on someone when he got dragged by Eijiro to hang out. Somehow, the conversation steered onto that topic because apparently, a few romances were born among all their classmates—Denki and Eijiro included, since Denki had recently started going out with Kyoka while Eijiro had celebrated his 2-year anniversary with Mina.

Normally, Katsuki would tune everything out from their conversation—because really, once he got dragged into something, he couldn't get himself out of it, even if he wanted to and continually made excuses for it—but everything Denki had mentioned was enough to make the gears turn in Katsuki's head one by one.

And now, here he was, his back turned from the person he apparently had feelings for, so he could grab punch and drink it because good God, he felt parched. So, he drank one cup—or, well, downed it. Honestly, anything he could do to get rid of the dryness in his throat and his stupid heart skipping a beat every time he saw Tsuyu out of the corner of his eyes would be helpful.

"Fucking shit," Katsuki muttered under his breath.

Why did he bother coming? He knew it was to see her, but for fuck's sake, he didn't even have anyone to talk to—or rather, he didn't want to talk to anyone except maybe Tsuyu. He refused to be a third wheel—hell, he was a fifth wheel once, and that was awkward as hell for him—because Eijiro and Denki were with their girlfriends.

Of course, now that meant he was stuck at the punch table, and it took everything in Katsuki to resist groaning.

And he was about to groan—because, really, why should he resist since he's the fucking Katsuki Bakugo—until he saw Tsuyu turn around, and dear God, why is her dress backless?!

His jaw dropped at that realization because everything was bare, and the V-line of the back of the dress only accentuated the curve of her backside and bottom.

Katsuki turned back around to face the punch table again and took sharp intakes of breaths because was that dress even appropriate?! Wait, no, most of the girls were wearing formal dresses anyway, and some of them were pretty damn short, but holy fucking shit, what the hell, Tsuyu?!

"Fuck my life," he muttered before groaning.

"I thought you enjoyed your life."

Katsuki flinched and turned around, his eyes turning into saucers when he saw that it was Tsuyu. Immediately, he tried to regain his composure because (1) this was the girl he had feelings for, (2) he did not want to look like a complete asshole—well, he was, but he didn't want to look like an idiotic asshole—in front of her, and (3) dear God, she was right in front of him, wearing a backless dress.

Finally, he scowled. "What the hell do you want?"

And immediately, he wanted to slap his damn forehead because why did he say that? Only a few seconds in, and he was already fucking up.

"Punch," Tsuyu replied. "You're blocking the bowl."

"Oh." Katsuki wanted to say more, but he didn't know what, so instead, he just coolly stepped aside for Tsuyu to get punch.

It…really didn't help that Tsuyu was now in proximity of him because now, he could see her back up close, and my God, he was trying his best to look away from her back—from her—but he just couldn't. And when his gaze finally landed on the side of Tsuyu's face—her long lashes and big eyes—he felt his heart skip another beat.

Tsuyu then turned to face him, holding a cup of punch. "You've been all by yourself this evening."

"So?" he asked, frowning.

"Aren't you going to go hang out with the others? Maybe see some people from our class or from the other classes?"

"Why should I?"

"To catch up with them—you know, see how they've been and everything."

"I'm not into that stuff."

Tsuyu tilted her head, raising an eyebrow. "Then, why come?"

Katsuki pursed his lips, not wanting to say that it was because of her that he forced himself to come. Well, at least he was having a conversation with her now, even though he initially planned on making the first move…

"So," Tsuyu began. "How have you been, Bakugo?"

Katsuki shrugged. "Same old, same old. You?"

"Wow, you're really bad at making small talk."

Katsuki glared at her, but when she smiled in response, obviously because she knew that she was teasing him, he felt his heart skip another beat, so he immediately scoffed and looked away.

"But anyway, I've been doing well," Tsuyu said before sighing, continuing to smile. "The sea's amazing, honestly."

"Yeah, until you drown."

"Do you not know how to swim, Bakugo?"

"I do know how to swim," Katsuki retorted. "I just try to avoid it because it washes away the sweat on my hands."

"Doesn't your costume protect you from that, though?"

"Yeah, but I meant on a regular day-to-day basis. You know, without the costume."

"That makes sense."

Katsuki pursed his lips before asking, "So, is that all that's been happening with you?"

"I mean, I mostly do my patrols in the sea, so yes."

"Did you find anyone yet?"

There, he said it. He finally said it. Or, well, why did he say that? For fuck's sake, he could've said something different, but no, he had to say that—and if she did find someone, then, well…

"No," Tsuyu replied coolly.

Katsuki took a sharp intake of breath, doing his best to calm down because she was single, meaning that he had a chance.

"I never really got interested in anyone," Tsuyu added after sipping from her punch. "I don't know… I mean, once you're out in the field, it feels like most of your time's taken up with superhero work, you know?" She paused, frowning a bit. "And in our circle of mutual friends and acquaintances, the only ones who've gotten together with someone were people who knew each other during high school at U.A., not at work or some mixer."

"Mixers can be sketchy as fuck, though," Katsuki said, ignoring the way his heart was metaphorically doing backflips because holy shit, she didn't like anyone, so he had even more of a chance now.

"Yeah, I know."

Katsuki furrowed his brow in confusion.

"I've been to a few," Tsuyu said.

"What?!"

"Is it that shocking?" Tsuyu asked, raising an eyebrow. "We're 26 now, you know."

"Well, no, but you just went on a fucking monologue about how most couples we know nowadays met their partner during their high school days at U.A."

"Yes, but still, that's no reason to be so shocked. Haven't you been to one?"

"No," Katsuki grumbled. "Because they're a waste of my time."

"Well, are you looking for a relationship right now? If so, a mixer's a good idea." Tsuyu paused before she smiled. "Unless you want to try one of those dating apps."

"God no," Katsuki groaned, scowling immediately. "Those are for hooking up. I'm not interested in that."

"There are a lot of success stories, though, like how some married couples have met each other through those apps."

Katsuki scoffed. "Yeah, if you exclude the number of people who literally just want to hook up and have a one-night-stand."

"So, I guess you're not looking for a relationship right now?"

Katsuki pursed his lips. "Uh, well…not really?"

Tsuyu tilted her head. "You sound unsure."

"Uh, well, I, uh, I like this girl," Katsuki said, thankful that he didn't completely stutter in front of her. With how perceptive she was, she might've been able to piece together that he had feelings for her.

"Oh, I see." Tsuyu paused before smiling even more. "Wow, I never expected you to crush on someone."

"Hey!"

Tsuyu laughed.

Katsuki growled. "You're fucking lucky you're cute."

Almost immediately, there was a pause of silence.

Within that moment, Katsuki realized what he had just said, and it took everything in him to try to act like he said it real casually, but good God, he was on the verge of panicking inside because why did that slip out of his mouth?! Yes, she was cute—fucking hell, she was beautiful and drop-dead gorgeous, but holy shit, what was wrong with him this evening?!

"Thanks, Bakugo. You're pretty handsome yourself."

His eyes widened, and he couldn't help but stare at her in shock.

"Oh, right, do you have your phone on you?" Tsuyu asked.

Immediately, he furrowed his brow in confusion. "Uh, yeah, why?"

"Can I borrow it real quick?"

"Sure, but what the hell for?"

Tsuyu smiled. "You'll see."

Katsuki narrowed his eyes in suspicion, reluctantly taking out his phone, unlocking it, and handing it to her, even though he knew she wouldn't try to pull a fast one on him. "Here."

"Thanks," Tsuyu replied, and after a few minutes, she smiled again and handed the phone back to him.

His eyes immediately widened in shock once he saw that she had just added herself as a contact on his phone. And yet, he couldn't say anything, because within seconds, she looked at him with a sultry gaze, her eyes suddenly glazed, and dear God, he suddenly had this urge to drink an entire bottle of water.

"Call me," Tsuyu whispered before walking away, her hips swaying with every step she took.

And he would do that. He'd definitely do that. He just couldn't say it because his eyes were still widened in shock, his jaw had freaking dropped, and his throat was now extremely parched.

But good God, if Tsuyu continued to act any further than how she just did…

Katsuki immediately did a sharp intake of breath, forcing himself to not continue those thoughts further because if he didn't stop them now, then he really wouldn't be able to control his impulses...at all—because this was his chance to be with Tsuyu, and fuck yeah, he was going to take it.

He just hoped he was patient enough to wait for it.