There was no way Mirio only had one quirk, but after the crystal clear demonstration of how his quirk worked, it all made sense now. At least to a certain degree.

Like how reactive do you have to be to make sure every single one of your body parts doesn't get caught when phasing through the ground or walls? Or how quickly do you have to think for your quirk to activate? Did it align with the average human reaction time of around 200 milliseconds? All questions Izuku would write to ask Mirio in due time.

But the questions tugging in his head were how powerful the other two were. Were Nejire and Tamaki strong as Mirio? Or were they stronger?

Tamaki seemed to be weaker, but maybe it was just his personality rather than not his quirk.

As for Nejire. Well, she seemed like a powerful individual with a cheerful personality that could definitely fit in with the budget of being a great hero. And she had a sisterly vibe to her. Whatever her quirk was, it was bound to be strong since they were the top three of U.A. high school.

Izuku was lost in thought as he headed back to the Class 1-A dorm. After getting mercilessly pummeled by Mirio's seemingly invincible quirk, none of them wanted to do any more training afterward. In the end, Izuku was the only one who stayed late after notifying Aizawa about his plan to train some more at Gym Gamma.

As he walked down the hallway, he spotted several of his classmates searching for someone. "Guys? What are you doing here?"

Sero turned around and his eyes lit up with happiness. "We were searching for you, Izuku! We were just about to watch a movie in the living room of our dorm and we were wondering if you wanted to watch it with us!"

Kaminari, Kirishima, and Mineta all looked at him with hope in their eyes, waiting for Izuku to confirm his decision. It was like some of his other classmates respectfully declined their invitation, so they were praying inwardly that he would accept.

"I'm sorry, guys, but I have to study." It wasn't a lie, even though it sounded like one. Izuku just wanted to dig deeper and discover more about Mirio, Tamaki, and Nejire's quirks. But his response must have been the wrong one because all four of them had mixed emotions, none of them being positive.

"Ahh! Midoriya, you party pooper!" Mineta threw his hands up in the air and glared at him. "Is it bad for heroes to have fun once in a while? Man, you guys always seem to be so focused on your studies that we have no time to wind down!"

"I get it, I really do, Mineta! But after seeing Mirio in action, I want to research more about the Big Three's quirks! It's just so interesting to me and I'm sorry you guys don't see it the way I do! Maybe next time?" Izuku offered to appease their wrath.

"Fine, we'll take you up on that, but don't back out of it when the time comes!" Mineta threatened.

"Nah, ignore him, Midoriya! Following your passion is manly!" Kirishima bashed his fists together with a smile glowing on his face. "We know you love to study quirks since you have tons of notebooks on almost every single hero! Still, it would be nice if you hung out with us…"

"Yeah, have fun researching their quirks, Izuku!" Kaminari chimed in.

"Thanks, but I'll walk back with you guys to the dorm before retiring in my room." Izuku laughed nervously.

"Yay, that works!" Kaminari cheered as they made their way back to their dorms.

Izuku breathed a sigh of relief inwardly. It was hard to let people down gently, especially when they were his friends, or rather, best friends. It was like shattering the dream of a kid, except less dramatic.

Maybe he should have accepted their invitation instead of researching his upperclassman's quirks. But the nagging feeling in his chest wouldn't go away if he did, so he had to make a compromise, and thankfully, they agreed upon the terms of it.

"Oh."

Izuku's attention snapped up to Kaminari's sudden sound effect. Following his line of vision, it dawned on Izuku that Kaminari was staring directly at Nejire Hado, their upperclassmen and the one person he wanted to talk to in order to find out more about her quirk.

"Hey, look, it's our senpai, Nejire Hado!" Kaminari put his hands out and pushed Izuku a little closer to where she was standing, looking down at her phone. "Didn't you say you wanted to research the Big Three's quirks? Now's your chance to talk to her while she's standing there all alone!"

"R-Right now? I have to prepare some questions like an interview before asking her about her quirk!"

"Sound like a lazy excuse, man! Just ask her the most pressing question on your mind like what her quirk is and what it does!"

"Okay, okay, I will! Just stop pushing me!" Izuku protested.

Taking a deep breath to prepare his mind to talk to a girl, Izuku walked with a bit of stiffness.

This was the perfect chance to talk to her, so why was he so nervous? Was it because she was pretty? Or was it because he didn't expect to meet her today? Whatever it was, Izuku wished he hadn't told his friends about his plan to gather information about the Big Three's quirks.

And what happened next couldn't have gone any worse. If Izuku could go back and replay the moment, he would have blamed it on the anxious energy that flowed through his veins. "Uh... Big sister-!"

It was a simple slip-up. It really was. It shouldn't have been a big deal calling Nejire sister since it was a minor accident, but to him, it was the most ridiculous mistake he ever made in his entire life. Not even rushing in to save Kacchan's life without a quirk could top this. Though that was a good accident since it led him to receive All Might's quirk. Bit this was different. Way different.

Izuku froze up and felt his cheeks burn like lava from embarrassment. Nejire looked up from her phone and turned around, only to see Izuku with his mouth wide open in shock from what he just said. She surveyed the area before recognizing he was calling her sister.

"Wait, what?!"

"There's no way!"

Izuku could hear his friends talking behind him in shock. They were definitely surprised since there was no way he could have kept his sister in secret while they were in the same school. But the thing was, it was all a misjudgment.

Nejire glanced at Izuku's classmates with interest growing on her face before she flashed a smile towards Izuku. "Didn't I tell you to keep it a secret, little brother?" She said, winking at him with mirth dancing in her expression.

Izuku's heart stopped as he tried to comprehend her response to his mistake. His classmates behind him suddenly became silent and he could feel all their eyes burning his back with their laser gazes. "What...?" Was all Izuku could say as he gazed straight into her eyes, searching for any hints as to why she just said that.

But before any of them could bombard Nejire or Izuku with questions, she skipped away from the scene, leaving them with their brains shredded in a tornado of questions.

Izuku watched as the distance widened between him and Nejire. Why did she just say that? What was the point of it all? Was she trying to tease him by joking around like that?

It hurt his brain trying to find an answer to it all, especially when nothing added up. He barely knew her. He didn't even know she existed until today, which was confusing since they held big names around the school unless Aizawa thought it best to keep them a secret from them until the right time. But why? Why would she say that so casually?

Izuku was so dazed from what he experienced he didn't hear his friends calling out his name until they nudged him on the shoulder to wake him up from his stupor.

"Izuku, is that really your sister?" Sero asked.

"Doesn't she have a different surname than you?" Kirishima pondered.

"I thought you had no siblings, but you were hiding her from us all this time?!" Kaminari shouted.

"How come you didn't tell us you had such a hottie as a sister?!" Mineta yelled.

Izuku stared blankly at their faces until horror forced him to realize they were actually buying the joke Nejire made. "No, no! Guys, that isn't it! She's not my sister, I swear! There's just no way we could be related!"

"But she just said little brother, meaning your siblings, right?" Kaminari pointed out.

"Yeah, he's right! I didn't know you guys were related! Is that why she was interested in our quirks just like you are?" Kirishima wondered as he connected nonexistent dots together.

"That's true! She even has some similarities like having the same height as Izuku! Also, when I first heard about the Big Three, I did a quick search on HeroTube, and guess what? She had horns on top of her hero costume that looked eerily similar to Izuku's hero costume! That's definitely what siblings would do, right, Izuku?" Sero asked as he drove his elbow into Izuku's stomach.

At this point, they were drawing conclusions out of thin air because of a joke she made. And to say they were crazy was an understatement, but Kirishima's seemed to hold some substance, even though it wasn't true.

"No, I just told you guys we aren't siblings! We aren't related by blood or anything! We're two different people that happen to have some common attributes, but that's just a coincidence! There's always going to be someone similar to you. Isn't that why friendships are formed because they're like you?" But Izuku doubted they would listen.

They seemed to believe the fake conspiracy theories that they were making up rather than trusting a faithful source.

"But she said it herself! She said to keep it a secret, yet here you are spilling all the beans!" Mineta then scrunched his face up in frustration, though it was short-lived. "Say, since you're her brother, can you deliver the message that I want to date her?" Mineta asked with a dumb sly grin crossing his face.

Izuku stared at Mineta with a mixture of disgust and disbelief. That was his primary concern? Izuku's glaring problem was some of his friends thought he had a sister.

"I'll take that as a no."

"Uh... Since we're close to our dorm, I'm gonna go ahead to my room. See you guys later!" Izuku turned around and fled.

"Wait, Midoriya!" Kirishima called out after him, but Izuku didn't turn back. "I wonder why he ran away? Is it because he didn't want any of us to find out about his sister?"

"Dunno, but let's go watch that movie! I've been dying to see it all day since it was recently released!" Kaminari exclaimed enthusiastically as he ran towards the Class 1-A dorm. "Last one there gets no snacks!"

Izuku plopped down on his bed as the scene replayed in his mind over and over again. It was so embarrassing. How could he make such a simple mistake like that? Was it because he compared her to being a sister? Like Kendo Itsuka since she's the big sister of Class 1-B?

"Gah!" Letting out a breath of annoyance, Izuku smacked his pillow without activating his quirk, otherwise, it would have destroyed his entire bed.

He shouldn't have been dwelling on it for so long, but it was like one of those moments where he couldn't help but look back on his life and cringe at how stupid he was back then. In fact, it was one of those moments, and now his mind wouldn't let go of it.

Covering his face with his pillow, Izuku stared up at the ceiling while his face shifted to a bright red color. He hoped to never see her again, but little did he know just how many times he would meet her.

Author's Note: It's been a while, but I'm back with a brand new Izuku X Nejire story for you guys to enjoy! I'm still working on smoothing out some bumps here and there so the story's end is a bit tentative, but I'll try my best to fix it before then! And don't worry, I am still working on posting the rest of the other stories I promised!

Also, if you want to know where the premise of this story stemmed from, it was my brain wondering what would happen if Izuku called Nejire Hado his big sister, and this is the result! Expect cringe, expect humor, and most of all, romance!

With love from your favorite writer, Out4Lunch!