I do not own MHA

If he was remembering right, it started when he was four; that had been the first day that she'd walked into class as if she was falling apart. He knew now that she'd found out about her supposed quirkless status; something that wasn't true at all. She'd looked lifeless for about a month and him being the horrible child he'd been, bullied her relentlessly when she finally got the courage to punch him in the face and tell him off. Some part of him had known it was wrong, but at the time he hadn't cared. She had been the only one willing to stand up to him and he craved her attention; even if it was selfish.

He'd tormented her for two years, both of which she'd fought back against him. While everyone else groveled before him, she'd snapped back at him. Even a mouse will attack when backed into a corner, he'd been impressed with how harsh she was. Then he'd met Frost and realized that she was just like him. They were fighters; who only respected the strong. Yet Izuku was different from both; the softness in her had worried him. She broke easily; he'd known that, yet he'd wanted to push her to the breaking point. He wanted to know how strong she was without Frost, that was why he'd tormented her and drove her into corners where she had no choice but to attack him. To be honest, it had been his favorite part of their interactions.

Still, she hadn't been as important to him as she was now. At most she'd been a fun past time; then she'd come to school wearing a yellow and green scarf. While it wouldn't have been too hard to write it off; she'd worn it in the middle of summer. He'd been confused so he'd confronted her about it; meaning he'd snatched it off her neck. At that moment his entire world had shifted, and he could still feel the protective rage simmering in his blood. The only one allowed to hurt her was him; a thought process that Frost had beaten out of his head.

It was a month after that when she'd seemed to brighten, her memories of the scarf incident vanishing as if they'd never existed. While confused, he hadn't brought the incident up ever again. If she hadn't wanted to talk about it then he wouldn't either. From there they'd became almost siblings and worked to repair the relationship he'd ruined, that was why he was currently glaring at Kaminari as the Lightning Bug talked to her.

He could tell something was wrong. Frost hadn't appeared in hours while the wolf was lazy she did have a fondness for Kaminari and he doubted she'd miss the chance to talk to him. The two girls hardly ever argued, usually knowing when not to push one another, or fight about anything. Frost had always kept her frustrations away from Izuku, lately, however, there had been a tension between the two and he'd known it was only a matter of time until it erupted.

Things had been changing since they arrived at UA, Frost was pushing Izuku harder than she ever had. He was worried, not that he would admit it, he didn't want either of them to get hurt. Mineta's death had hurt her far more than he thought it should have, he knew why. She was putting all the blame on herself since she was within inches of the boy when he died. He doubted she cared about the boy at all. He knew he didn't, but he cared about Kirishima and the others in their class. That was why he was sitting on an armchair in Momo's large living room watching his class talk.

Sighing he stood noting the way Todoroki winced as the boy walked to the kitchen for more snacks on Momo's request. It was so subtle that he wouldn't have noticed if he hadn't already been watching for it. He was watching all of them like a guard dog as they chatted. It wasn't on purpose but the USJ had left his nerves on edge, every part of his body was tense even now. He doubted he would relax any time soon. Shifting slightly, he watched Izu smile and knew it was fake.

Standing he didn't even hesitate to walk to the kitchen, he wanted to know what was wrong with Todoroki and he wanted to know now. Walking into the area he raised an eyebrow as the other boy stacked little cakes onto a plate. He knew most of those would be eaten by Momo, her sweet tooth was almost as bad as Izu's own.

"Do you need something," Todoroki asked the stoic tone snapping Katsuki out of his musings. Frowning slightly, he realized he'd been staring at the other boy for almost a full minute.

"Why the hell are you flinching every time you fucking move," he asked making sure to speak low enough his voice wouldn't carry into the other room. The question struck Todoroki into silence as he stared at the blonde.

"I have no reason to answer that question," he stated. The tone was hollow, and he knew without a doubt that something was seriously wrong with the other boy. Katsuki couldn't stop his eye from twitching as he glared at the other boy in frustration. The finality in Todoroki's voice meant the boy wouldn't answer anything he asked.

"Why the fuck not," he snapped. His words were said more out of habit than anything else. Todoroki simply raised an eyebrow before shoving past him back into the room where the others waited. Snarling Katsuki didn't bother to follow him, instead, he leaned against the counter. Telling himself that he didn't actually care he glared at the wall. Fuck, why did he care?

Turning on his heel he walked back into the living room his eyes finding Kirishima as the redhead helped Mina set up a large pallet in the center of the room. When Sero reached out to help them Katsuki sat down beside Izuku on the couch. The girl smiled brightly at him although it didn't quite reach her eyes. Cutting his gaze away from her and tensed when he noticed Uraraka carrying an empty glass bottle.

The wicked glow in the girl's eyes was almost intimidating but he couldn't stop the amusement he felt at the fact she could make such a face. Feeling his lips twitch upward he watched her whisper to Momo the delight that crossed the taller girl's face was hard to ignore. Rolling his eyes he turned his attention back to Kirishima. The dark blue shirt was hugging his frame as he moved the smile on his face seeming to catch the light.

Running a hand over his face; Katsuki could admit he had a small crush on the other boy. Feeling Izu nudge his side he glanced at her amused at the knowing look she had. It was the first true emotion he'd seen on her face since her fight with Frost. He was glad she was finally letting go of the anger she'd been holding since she woke up.

Hearing footsteps he looked up just in time to see Uraraka stand in front of them. It took all his willpower not to smirk when Izu noticed the vicious grin on the brunet's face. Hearing her say something about truth and dare; he scoffed amusement hidden in his eyes. Seeing her grab Izu's wrist he raised an eyebrow. He only realized that the girl intended for him to play as well when she grabbed his wrist; tensing he barely stopped himself from attacking her as she tried to pull him off the couch. The almost inaudible growl he gave in warning was met by determined eyes.

"Come on Bakugou," she ordered. It would have been easy to snatch his wrist from her grip but he hesitated. She'd touched him without worrying about him hurting her; his middle school classmates had been terrified of him. Narrowing his eyes, he studied her; there wasn't an ounce of fear in her eyes just determination as she dug her heels into the floor. Standing suddenly, he smirked allowing his amusement to show as she stumbled backward. Grabbing her wrist, he kept her from falling ignoring the questioning glance Izuku sent him. He supposed that she decided to ignore the strangeness of his actions when she started to help Uraraka pull him toward the now set up pallet.

The wide grin that stretched across the brunet's face was matched by Izu's as the two girls led the way to what he guessed would be his doom. Sitting down between them he glanced up meeting Kirishima's eyes for just a moment. The smile sent to him by the redhead caused a warm feeling to bloom in his chest. It was almost torture to resist returning the expression instead he sent the boy a smirk.

His expression turned into a growl the second Kaminari threw his arm over Izu's shoulder pulling her closer to him. The protective surge killing the warm feeling; he wasn't even satisfied when the lightning bug gave a nervous chuckled and pulled away from her. Scoffing he paled a little when he saw Mina snickering.

"Me first," Sero shouted reached for the bottle Uraraka had placed in the center of their circle. The amount of cursed that ran through his mind was nothing compared to the dull look that Jirou gave when it landed on her. He did not doubt that if Momo wasn't beside her the girl would have strangled the boy.

"Dare," she said blankly. Turning them out Katsuki tilted his head slightly.

All of this; the games, cakes, and laughter, was to forget about Mineta. A vain attempt to forget about their fallen classmate, yet he had no doubt that under the smiling and joking there was pain; somehow the thought of anyone hurting them ticked him off. They were his classmates, every one of them belonged to him and he would sooner destroy the world than allow them to be hurt. Frowning he bit his lip.

Was he angry? More than anything else. He wanted to tear about Shigaraki until the man was begging for mercy. Izu had unfortunately called dibs on the villain. He wanted to storm their headquarters then blow the place to hell, but he had no idea where to find them. Something that also ticked him off.

Was he possessive? That was something he'd always known, just like Frost when someone earned a place beside him, they would always belong to him. Fighting and dying for those who had his loyalty was an easy choice, knowing that he couldn't find it in himself to let go of the rage burning in his blood. Mineta, while he personally didn't care for the boy, had been his classmate. For nothing other than that fact, he would allow Izu to tear Shigaraki apart.

Feeling the grip on his wrist tighten he realized that while Izu had let go the second he'd sat down, Uraraka was still holding onto him tightly. Glancing down he noticed the bottle pointing at the brunet and the wicked grin on Mina's face. Frowning slightly, he quickly forced his face into a blank expression.

"Well Uraraka, you picked dare," the pink-skinned girl teased. Knowing that he'd missed something major he flicked his gaze to the others catching the panicked expression on Izu's face as she shifted nervously. Suddenly he had the urge to flatten the pink-haired girl into a pancake and create a crater in Momo's perfect living room. Instead, he tensed his as the hand on his wrist tightened again. Cutting his eyes back to Uraraka he was surprised at the fire in her eyes.

"Pick something else," she snapped. She didn't move or even twitch, but Mina flinched under the girl's glare. It was slightly impressive that he could feel the anger radiating off her from here.

"Right," Mina agreed hoping to appease the angry girl. The gentle smile Uraraka sent her was somehow more intimidating to everyone but Katsuki who found himself smirking. His interest in the girl skyrocketing as she loosened her grip on his wrist. When he chuckled, she stiffened her eyes cutting to him as if realizing he was beside her. Seeing her eyes glance down at her hand, mirth filled his eyes as she released him quickly. Turning his attention away from her to Kirishima he pretended not to see the way she stared at her hand.

Tuning out again he ignored them as he leaned over his head on Izu's shoulder as he dozed lightly. He was slightly tired, and he knew Izu wouldn't mind. It was sometime later when he felt someone poke his cheek. Opening his eyes slowly he glared at Izu who simply pointed down to the bottle. It was his turn apparently. Glancing around he placed a snarl on his face when Asui waved at him halfheartedly.

"Truth," he stated. The lazy growl in his voice relaxing the frog girl. Did she seriously think he would attack her for being unlucky enough to wake him up? Seeing Jirou lean over and whisper something to the girl he raised an eyebrow. His night was just getting better and better, wasn't it?

"What's going on between you and Izuku," she asked. The questioning tone caused the two pseudo siblings to share a glance. He knew she would leave the decision of how much to tell them up to him and part of him wanted to deny everything. Yet, they'd promised no more hiding once they got to UA. Sighing he straightened and ran a hand through his messy hair.

"Izu has been my sister since we were six," he said. It was said without growling at all and he was amused by the looks they shared with each other. None of them knowing what to do with the confession, except for Kaminari who had a smug expression on his face. It dulled his amusement when he noticed it.

Deciding to just ignore the boy he reached down for the bottle his expression never changing as it landed on Todoroki. The boy simply gave it a dull look before picking truth with a dry voice. Katsuki, for only an instant, wanted to ask about the apparent injuries the boy had but chose not to. He had a feeling that the other boy would not appreciate the line of questioning. He wasn't a gossip either so asking about cruses was out although he doubted Mina would appreciate him ruining her chance to get information. He just wanted to go back to sleep.

"Favorite color," he asked reluctantly. It was the only question he could think of that the boy wouldn't freeze him for. Relief flashed through the other boy's eyes for just a moment before he said blue with little to no emotion.

It was only two hours later that everyone else was asleep when Izu told him about her fight with Frost in whispers. Her head laying on his lap as he ran a hand through her hair absently. Watching he fall asleep he finally had time to think. He'd known something was going on with his girls, but he hadn't expected it to be this bad.

She'd had a fight with Frost over memories that the wolf had hidden away. Running his hand through the sleeping girl's hair he thought over the situation. Frost was like him, as long as Izu kept asking for the answers, she wouldn't give them. If he was right, the wolf was trying to force her into a corner, he had to wonder why she was making her move now. The only thing that had changed was their acceptance into UA.

Eyes widening his hand froze as he remembered the way Asui had described Izu at the USJ. Her eyes had been green when she fought. Knowing that he had a pretty good idea why Frost was pushing Izuku now rather than during their middle school years. Izuku had finally fought by herself without Frost there to guide her. It was something Izuku most likely didn't realize herself, but she no longer needed Frost to help her fight. She was strong enough on her own now. Leaning back against the couch he closed his eyes. The ticking of the clock in the corner lulling him to sleep.