Disclaimer: I do not own My Hero Academia or Fate/Stay Night

...

The rippling of flesh beginning to reshape itself into something resembling a limb was halted as Shirou brought the cursed spear back into reality. He had noticed the beast relatively motionless but had kept his guard up regardless. At the first sign of the regeneration he had brought Gáe Buide back into existence. In doing so, the wounds which had attempted to regrow were prevented from doing so.

"Do you think that was wise kid?" asked Aizawa from nearby, clutching at his damaged arm. "Telling them how your weapon worked."

"They had seen what had become of this thing because of Gáe Buide, they would have come up with a similar conclusion on their own," explained Shirou as he drove the head of the spear deep into the ground.

"So you were helping them then," declared Aizawa.

"No, I was giving them just one reason to fear me."

Aizawa couldn't prevent the hairs on the back of his head from standing on edge at Shirou's words. He had known that a number of heroes had struggled to capture him before the school term had even commenced and having watched his display and even fought by his side it was easy to understand how they had struggled.

"We got lucky in this instance," said Shirou as the main doors opened, All Might leading medical personal into the building as well as a number of heroes. "This guy here was meant to be their way to take down him. They just didn't realize that they'd come across me."

Again, Aizawa was unable to prevent the chills that spread across his body. He had felt firsthand the strength that this monster had possessed and it was abundantly clear that his regenerative abilities were something extraordinary. During the fight however, when it was unable to grow it's limb back, it had paused, confused almost about why something wasn't going the way it should. Could incredible strength and the ability to regenerate limbs have been enough to take down All Might, it was hard to tell and he was thankful that he would never have to witness such a clash.

"So you're saying you're stronger than All Might."

"Don't know," said Shirou with a shrug. "I do know that I ended up being a better match against someone who was brought here to absorb blow after blow from a man with great strength. I doubt it even went full bore at me, probably could only regenerate so much or take so much damage in total before reaching it's limit, hence not going all out. By the time they realized how much danger they were in, it was all over."

Aizawa sharpened his eyes as he looked at the boy in front of him, though it almost looked as if he was looking at a hardy battle veteran. Even the way he had just broken down the bout with the creature that resided near where they were standing was more than some heroes filled out on their official reports. Unfortunately that didn't give him much detail regarding what Shirou was truly capable of in the grand scheme of things. Having been able to block a blow which theoretically shatter bones was something which no normal teenager have been capable of doing, not to mention reacting in time in the first place. The ability to systematically disassemble his opponent with no second thought was concerning but he was not going to nitpick about that now.

Also, and he wasn't going to say this out loud, he felt like the teenager had been doing an experiment of sorts regarding the creature who was still breathing despite the damage it had taken. Shirou seemingly had been testing the time that it took for the beast to regenerate and possibly working out whether injuries recovered at the same time or whether there was a delay due to the number of injuries that had been sustained. It was terrifying thoughts but ones that he had to keep in the back of his mind under the possibility of being true.

For now, he needed to report just what had happened.

...

"Look, it's not your fault," said Jiro as she rubbed at Momo's back. The two of them plus Kaminari had returned from the space in which they had been teleported still shocked by the developments that had taken place. Kaminari in more of a literal sense than the two women but that was a different topic.

They had done well in the situation they had found themselves in, surrounded by the opposition and being able to take down a majority of those who opposed them was no easy feat. It was just unfortunate that one of the enemies were able to get past Kaminair's widespread attack and take the boy hostage, almost willing to kill the boy if the two of them were unwilling to cooperate. That of course had changed entirely when his peripheral vision had caught sight of his ticket out of the academy leave with only one other individual leaving him effectively stranded. With All Might standing in the doorway and his leadership having actively fled the scene, he had thought it wise to take this opportunity to surrender and hope that in doing so he would spend less time in prison for his actions.

Learning however that every other group that had been set upon by villains however had managed to overcome their respective obstacles without any showing of defeat had left a sour taste in Yaoyorozu's mouth. If that wasn't bad enough, word had quickly spread about just why the most dangerous individuals had retreated when they had. If it had been the arrival of the number one hero, she would have been more understanding on the situation. To learn however that it was the doing of the individual who had successfully guided his team to victory through hellish conditions however to succeed where many others would have failed the previous day.

Emiya Shirou.

It wasn't like she wasn't aware that he was skilled. Far from it. She had no idea how far the gap was however. Part of her had believed that all the footage she had seen of heroes going against Shirou and his accomplice had shown the heroes in a good light. They were professional heroes and as such she had willingly believed that they had been pulling their punches against people who were in the middle of a crowded area.

Apparently she was wrong in her beliefs. She now fully understood that the heroes had not been pulling their punches. Shirou and by all accounts his partner, were incredibly powerful. There was no two ways to look about it.

"What was it like?" she said softly, almost inaudible due to the amount of people around them. "Having him lead you."

JIro found herself leaning backwards, her gaze shifting towards the roof. "It was...odd," she said with a sigh. "You know that feeling, when everyone has faith in you but you feel that deep down you can't live up to their expectations. Shirou made us believe that we could not only live up to those expectations, but surpass them. I mean, he told me to fight Tokoyami head on, fully aware that I was the team leader and that if I failed it meant the team was out. He gave me advice, pointed out some oncoming attacks I should have been aware of and helped lead me to victory and without him, I doubt that I would have even thought I could beat Tokoyami."

"So...he gave you faith...in yourself?" summarized Yaoyarozu, unsure if what she was saying was correct.

"Yea," said Jiro as she found herself playing with the jack dangling from her left ear. "Could I have done any of that without him, I doubt it. All of us, I think we got better from just being near him, by having help us and believe in us."

"Believing in yourself," said Momo as if stuck in a trance, Jiro opting not to continue as personal came by to check up on them for what felt like the second time more than necessary.

...

Shirou watched as the behemoth of a creature was wrapped up in 'supposedly' unbreakable bonds. Honestly he seriously doubted that the restraints would have any effect on Berserker but that was a thought for another time. He got the subtle nod of the head from an officer nearby, signalling for Shirou to remove Gáe Buide from this plain of existence once more. As he did though he started counting internally the seconds ticking by before the creature successfully was able to have fully grown limbs once more.

Despite being physically at its peak, the beast made no effort to resist it's capture, almost submitting to the law enforcement as further restraints were placed on the newly acquired limbs. The exposed brain gave Shirou the unsettling feeling that the creature before him was being controlled, or at least had been whilst the invasion was unfolding. If it was being controlled, then that meant that somebody was controlling it, which unfortunately meant there was a mastermind.

Shirou was broken from his moment of concentration as he felt a presence behind him. Turning slowly, he found himself looking at the form of Midoriya, the boy almost struggling to keep his composure. Shirou could understand why, undoubtedly rumours had spread based on the very true fact that he had dismembered something that the association that had attacked them believed could kill All Might.

As for Midoriya, the small lad was doing his best to keep head strong, especially after what had just went down. He, Asui and Mineta had found themselves in a battle against the numbers before finding themselves able to turn the situation into their favour. That also meant that they had returned in time to see a chunk of the bout that had taken place.

"Can...could you...train me?"

The question was slow and ill paced considering the context. Midoriya hadn't quite been sure how to ask said question without directly insulting All Might. The number one hero had put so much time and effort into helping him get into the prestigious academy in the first place that it felt as if he was breaking an unspoken promise. With that said however, All Might was still a professional hero, as well as a teacher. There was minimal time that he would be able to get a one on one training session in with the top hero.

So he had to look elsewhere.

"Ask me again, properly," instructed Shirou.

Midoriya swallowed a lump that had formed in his throat before stiffening himself, both physically and mentally. "Could you train me?" he repeated, determination ringing through his voice.

"No."

Shock ran through Midoryia's system as he stood there flummoxed, having not expected to be shut down in such a manner. He knew it has been a long shot but he hadn't thought that he had had no chance whatsoever.

"Why?"

Surprisingly, it wasn't Midoriya who had spoken. Rather it had been Yaoyorozu, the teenage woman having seen her green haired peer making his way towards Shirou and with Jiro's words ringing in her ears, had chosen to approach as well.

It seemed however she wasn't the only one. In groups of twos and threes, Class 1-A found themselves standing in front of Shiro with two exceptions of Todoroki and Bakugo. Somehow, it wasn't surprising to anybody in attendance.

"Why won't you teach him? Or teach us for that matter?" asked Momo, finding her voice. "It doesn't matter that we're students, villains came to us in our school and attacked us. Our teachers did what they could but..."

"Then let them teach you," interrupted Shirou, jabbing his thumb over to where the professional heroes were congregated. A couple of them had the great idea to look upset by the fact that their students didn't have faith in them, more so Midnight who was pouting at the thought that the teenagers didn't want to be taught by her. Unfortunately that seemed to will the crowd on more than it should have.

"Then how did you learn?" asked Kirishima, his hands clenched into fists. "Can't you at least tell us how you learned?"

"I fought," said Shirou, recalling the training he had gone through against Saber. "I fought against someone far stronger than me, again and again, over and over. Every time I fell, I got back up. If you wanted me to train you, then I would knock you down, time and time again without hesitation. If you were able to last a second longer in your final bout than your first, then congratulations you successfully made progress. I didn't have the luxury of time on my side to gain strength and only had that option out of desperation and necessity. Without it, there is little doubt that I would not be standing here right now."

His words hung in the air and he could see that a few of the students were still contemplating the idea of training with him, for at least a single session. Running his fingers through his hair, Shirou allowed a sigh to escape from his lips. "If you really want to train with me," he said slowly, hoping he wouldn't regret the decision he was about to make. "Meet me in the gymnasium after the final bell."

His instructions, understandably triggered some of the teachers who could hear what he was saying. "Oi! Oi!" shouted Present Mic as he crossed the distance between where the two groups were standing, kicking up dust in his wake. "These kids just went through hell, and you want to beat them up more before they have a chance to recover? What kind of heartless man are you?"

"Will their enemies give them time to breathe?" asked Shirou, the glance he sent at the teacher causing the professional hero to take half a step backwards. "Of course not. They don't care if you're exhausted, fatigued or injured, they'll see that as an opportunity to take advantage of the situation. At that time, regardless of your condition, you have to stand up and give it everything you have and more."

Shirou knew that his message had been received, but he felt like he needed to add insult to injury. "Plus Ultra."

He could almost see the anime style tic mark appear on Present Mic's forehead at the school motto's being used against him. Thankfully, before he could rise to the taunt, Principal Nezu spoke up and in doing so brought the attention upon himself. "While Mister Emiya's words do ring true, I do know that rest and recuperation is important to one's understanding of themselves. Sometimes to simply be able to reflect on how one progressed throughout the course of the day is something truly wonderful in it's own right. I do know however that you are teenagers and as such some of you may or may not have had your fair share of action today. If you feel as if you still have something to prove, then I encourage you to join Mister Emiya in the gymnasium where Midnight will overlook proceedings."

"However, this is truly optional and any injuries sustained in said exercise will not be looked over by Recovery Girl and you will have to let your bruises, welts and cuts heal in their own time. You might consider them your badges of honour or horrible blotches on your skin, it matters not. I have full trust that Mister Emiya will not use potentially lethal methods in teaching those of you who join him but I also believe he will not go easy on you. You have been warned."

Shirou couldn't help but internally thank the principal for speaking up when he did and he wasn't silly enough to use any lethal weapon against schoolchildren. Torashinai would more than likely be enough. Now there was the grand question however of how many standing before him would be foolish enough to fight him.

...

The remainder of the school day seemed to drag on and on before the final bell rang, signalling that they were free to leave the premises. Todoroki meanwhile had no intention of leaving the grounds when the rest of the academy opted to head home. Many of his fellow Class 1-A students had the same mindframe. Shirou had already been permitted to head to the gymnasium to prepare himself for the training he was going to give.

'Training' being the subjective word in that statement.

He could hear the gossiping of his peers as they marched around him to the gym. He cared not for their meanderings as he focused on the objective before him. Could he go toe to toe with Emiya Shirou? He was going to find out one way or the other.

The doors to the gymnasium opened up, Ashido being the one to open the entryway to reveal that Shirou already had his first opponent standing opposite him. While it momentarily shocked some of those around him, Todoroki quickly worked out that this was likely a way for upperclassmen to have an opportunity to go against one of the best the school has to offer in a semi controlled environment.

He, along with his peers, entered the area as quietly as they could before closing the door behind them. Other than the two competitors and Midnight, there were only two other students in attendance, likely friends of the person who had challenged Shirou. It would be interesting to see how someone else who had yet to see Shirou in action could face off against him.

Or it would just be plain interesting as numerous screams of shock echoed around him as the person whom had challenged Shirou found himself naked, his clothes falling off his body without any warning whatsoever.

...

Hope you enjoyed.

For those of you who commented on Gae Buide's curse, I completely understand where you are coming from and I hope that the explanation given is satisfactory.