"Sero, now!" Izuku shouted as the villain bots appeared in front of them.

They were in the middle of a combat simulation, their opponents being three huge zero-pointers. Izuku had been paired up with Sero and Aoyama. The objective was to learn how to fight in teams and to determine how to use everyone's quirk in the most efficient way.

"I got this!" Sero grinned. He ran and used his tape to bind the villain bots from afar with impressive accuracy, restraining them from action by knotting his tape around their whole structure. With that, the zero-pointers couldn't move anymore, therefore making destroying them way easier.

"Aoyama! Let's go!" Izuku exclaimed as he speeded up toward the villain bots. At the same time Aoyama destroyed one of the zero-pointers with his navel laser, Izuku used one for all full cowl to jump in the air and throw a powerful punch to the second zero-pointers. The strength of his attack was so powerful it sent the villain bot crashing into the third one, thus destroying two zero-pointers in one go.

"Yeah, guys! Beat them up!!" Sero cheered at the sight. However, what no-one had thought about was the explosion that would follow the destruction of the villain bots. They suddenly blew up and sent pieces of metal everywhere in the air, one sharp fragment flying straight toward Sero.

"Watch out!" Izuku's emerald eyes widened at the sight. The omega didn't have time to think. He reacted by pure instinct, his body moving on its own. He used one for all at full power to quickly jump in front of Sero, successfully protecting the dark haired alpha but taking the hit himself instead.

"Midoriya!" Sero gasped as he saw Izuku crash on the ground in front of him. He immediately went to the green haired and helped him to sit up, a curse leaving his lips when his eyes landed on the trail of blood coming from the top of Izuku's head. "Fuck, you're bleeding!"

"I'm fine, don't worry..." Izuku replied with a small wince. It looked like the piece of metal had cut through his flesh, but it didn't seem too serious. There just was lot of blood. "Let me see." Sero said as he began to reach his hand out toward Izuku's head when someone abruptly stopped him.

"Don't fucking touch him." Katsuki growled.

All students of class 1-A had seen what had just happened. They were watching the combat simulation from the sidelines but, now, they were all running to see how Izuku was.

"Midoriya! Are you okay!" Ochaco immediately worried at the sight of blood on Izuku's face. She tried to approach him but Katsuki let out another deep growl, the threatening snarl instantly making Ochaco stop in her tracks.

"I said don't get fucking close to Deku!" Katsuki yelled. He couldn't help it. His omega was hurt and his instincts were going ablaze. He needed to protect Izuku and not let anyone approach him. "You!" He growled as he turned to face Sero. "Couldn't you fucking move out of the way yourselves? Uh?!"

"Kacchan, calm down..." Izuku weakly complained. His head was hurting and Katsuki's yelling wasn't making things any better. However, having his alpha close to him was reassuring him. It made him feel safe and relaxed.

"You're hurt because of this fucking idiot! Can't see fucking chunks of metal falling on him!" Katsuki angrily replied and Izuku sighed. "But I'm the one who caused this..."

"Don't give a shit." Katsuki snarled. Sero shouldn't need Izuku to save him. He was supposed to be a hero in training, not a goddamn civil.

"Quiet, everybody." Aizawa asked as he arrived where all the commotion was. He walked right toward Izuku and ignored Katsuki's growl, instead squatting down to be at Izuku's level. "Midoriya, look at me." He said as he began to inspect his student's state.

Like Izuku thought, he didn't have more than a cut on the side of his forehead. Everyone was making a fuss about it only because a lot of blood was escaping the shallow wound. "Do you feel like throwing up or passing out?" Aizawa inquired. If Izuku had a head trauma, it could become a serious problem. Otherwise there was nothing to worry about.

"No, I don't." Izuku answered so Aizawa stood up. "Doesn't seem too bad. I don't think you need to see recovery girl for this, so just use the first aid kit in the changing room." He stated with a tired sighed. "Sero, you're going with him."

"The fuck? I'm the one going with him!" Katsuki immediately retorted. There was no way he'd let Izuku alone with another alpha, especially when Izuku was hurt and when the alpha in question was Sero. The dark haired alpha had already shown that he was interested in Izuku several times. Katsuki wouldn't let him tempt anything.

"Your team is the next up to go, Bakugou. You're staying here." Aizawa replied but Katsuki wouldn't hear any of it. "The hell I'm staying here!"

"Kacchan." Izuku calmly called out. "It's okay. You can join me just after finishing the combat simulation." He said with a soft smile, his voice sounding calm and relaxing as he rested his hand on Katsuki's shoulder. He wanted to make his alpha understand that everything would be fine, that there was nothing to be worried for.

Katsuki let out a frustrated sigh before finally giving in. "Fine. I'm gonna destroy these damn bots in no time, just you wait." He grumbled as he headed toward the starting line of the combat simulation. The sooner he got this over with, the sooner he'll be with Izuku.

Izuku couldn't contain an amused smile as he watched Katsuki disappear. "Let's go, Sero." He eventually stood up, a small wince escaping his lips at the soreness of his muscles after having used one for all at full power, even if it was only for a short moment.

"You okay? You need help walking?" Sero immediately worried. He was about to wrap an arm around Izuku's slim waist to help him when Izuku stopped suddenly him. "No, it's okay." The omega assured. His whole body was fine, only the cut on his forehead was hurting. Plus, Katsuki wouldn't like it if he smelled of another alpha.

"You sure?" Sero insisted but Izuku already started to walk toward the changing rooms. "Yes, don't worry." He really didn't need help. He could walk by himself just fine.

The changing rooms were close to the combat zone they had been fighting in, so reaching them didn't take time. Sero held the door open for Izuku when they arrived in front of it before getting inside in turn. "You can sit, I'll find the first aid kit." He said as he headed toward where he knew the first aid kits were.

"Thank you." Izuku sat on one of the benches of the changing room. He sighed and cautiously tried to touch his cut on his forehead, grimacing when he saw all the blood on his hand. He really hoped he hadn't stained his hero costume.

"Here, I got it. Let me see your wound." Sero returned with the first aid kit in hands. He squatted down in front of Izuku and gently took Izuku's face into his hands, wanting to inspect how the cut looked like. He then put disinfectant on some cottons before cautiously starting to clean the wound, removing the blood on Izuku's face at the same time.

"Does it hurt?" He gently asked.

"Just a little." Izuku whispered in response. Sero was being so gentle and prudent with him it didn't hurt much. He could only feel the stinging sensation of the disinfectant on his wound.

"I'm sorry you got hurt because of me." Sero unexpectedly apologised. He was feeling bad about the situation after what Katsuki had said. It was true he should have been able to protect himself from the explosion's projections without Izuku's help...

"It wasn't your fault. I'm the one who put you in danger." Izuku immediately replied. He had miscalculated the strength of his attack and it was what had put them all in danger. It was only natural that he would prevent Sero from being hurt.

"Still, thank you. You're amazing." Sero honestly thanked and Izuku couldn't help but blush at the compliment, an adorable rosy shade taking over his pretty features. "You're welcome." The omega timidly answered with a soft smile on his pink, plump lips.

"You're so pretty." Sero couldn't resist blurting out.

"What?" Izuku's face turned a darker red at the words, his breathing suddenly hitching when Sero gently caressed his cheek.

"I swear you're the most beautiful person I have ever seen. Really." Sero continued to compliment as his gaze landed on Izuku's irresistible lips. He remembered the one time he had kissed them and how soft and perfect they had felt against his own.

"I can't forget the taste of your lips..." He murmured as he began to lean in to kiss Izuku.

"Wait, Sero..!" Izuku was about to push Sero away when sharp pain suddenly took over his whole body, burning warmth abruptly swelling inside him all of a sudden. "Agh!" He let out a loud yelp and curled up, his sudden reaction instantly making Sero stop any tentative of kissing him.

"You okay?" The dark haired alpha immediately began to worry at Izuku's shout of pain.

"Oh no, please, not this..." Izuku trembled, his entire body aching as his heat arrived incredibly fast. Since it had been some time since it had last happened, Izuku had completely forgotten about his unstable heats. He had thought maybe they had finally became normal, but of course they had to suddenly come back when he was alone with another alpha than Katsuki.

"What is it? Are you in pain? Is it your wound?" Sero kept asking as he watched Izuku writhe in pain. He had no idea of what was happening and was starting to freak out.

"N-no, it's not... p-please, go find Kacchan..!" Izuku managed to say between whines. It felt like this heat was going to be way more intense than the others. The pain he was already experiencing was horrible.

"What? I can't leave you alone like this, you look like you're gonna pass out!" Sero exclaimed. There was no way he was going to abandon Izuku like this, it was too dangerous.

"I-I'm not, just go find him..!" Izuku raised his voice. He couldn't stay alone with Sero, that just wasn't an option. He really needed the dark haired alpha to leave and to go find Katsuki for him. Things would turn really bad if he was in heat with only Sero next to him...

But Sero wasn't listening to him. He instead checked Izuku's temperature by pressing a hand against the omega's forehead. "I can't, you're burning up. I should bring you to the infirmary."

"N-no! Oh god!" Izuku yelped in pain as another hurtful wave of burning warmth took over him. "P-please, leave!" He shamelessly begged, knowing he was only seconds away from completely losing consciousness. His whole body was hurting and his head was spinning. There was nothing he could do but to lay in his curled up position, waiting for his heat to fully overtake him...

"Midoriya? Midoriya!" Sero shouting his name was the last thing he heard before everything went black.

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