Once they arrived at Might Tower, All Might had been quick to get into action. First, he'd called in his medical team to pick up the child and take her to somewhere safe, warm, and comfortable. If he was right and she'd been experimented on, he didn't want her anywhere near the sterile environment of a hospital room.
He'd had her taken to one of the tower's many guest suites to sleep it off and had asked that one of the many Pro-Heros based in the tower keep an eye on her along with a nurse until he was able to return from UA.
As for young Midoriya, he'd ushered him up to his personal locker room for a quick shower while ordering a proper change of clothes to be sent up to him while All Might changed into his Hero costume.
"All Might?"
"Well, speak of the devil, Midoriya-shounen!" he said with a deep laugh as the boy walked into view.
One thing that Toshinori would never openly admit is even after all these years he still found it flattering, and maybe a bit embarrassing, when he saw someone dressed in imitation of himself. So of course, he had to hide a bit of a blush when he saw what Izuku was wearing.
The brave young lad was clad in a tracksuit, but not just any tracksuit, no. An All Might branded tracksuit he had brought up from the giftshop. This way he didn't have to go through the trouble of having anything bought, as he technically already owned everything in that shop. Buying from one of the other stores would have introduced additional complexity, and with it, possible points of confusion. As this was already an odd day, he wanted to give that rat bastard Murphy as little additional purchase as possible on the day's events as was physically possible.
This way all he'd had to do was order a selection of clothes brought up and let the young man simply take what he felt he needed and be done with it.
"Thank you for the clothes, All Might..." Izuku said with a slight blush followed by a deep bow, "I'm sorry for being a bother..."
"Nonsense," Toshinori said in a tone that brooked no argument, "I'd been prepared to pass you my quirk. A simple change of clothes is nothing."
"Still I..." the boy stammered, causing Toshinori to smile.
"Really, there's no trouble, Midoriya-shounen," he spoke with a chuckle. "Come along, we don't want to be late!"
Izuku nodded furiously and jumped in step beyond him, following him dutifully as he walked down the halls. For a moment, they were in silence before the boy looked up to him.
"All Might?"
"Yes, Midoriya-shounen?" his mentor asked with a peaceful smile on his face.
"I was thinking about the girl's quirk," he said after a moment of thought. "She has me a little confused."
Even without taking One for All into account, he'd been far too hasty in claiming that the boy had no potential as a Hero during their first fated meeting. His gift for quirk analysis was exceptional, to the point he honestly wondered if the boy's apparent 'quirklessness' was simply the result of a lazy pediatrician being unable to spot a subtle ability. After all, not all super powers were flashy. Sometimes even the most powerful could be anything but.
"Do your best thinking in the shower, do you?" he lightly teased, causing the boy to stammer lightly before laughing aloud. "I know the feeling. So what have you been thinking, my boy?"
"Well, I don't think she actually has a healing quirk," young Midoriya stated, causing All Might to raise an eyebrow. He'd like to know the boy's logic.
"Really now?"
"I've never heard of a healing quirk that works instantaneously," he said after a moment, causing Toshinori to nod in agreement. Not had he. "Plus she was able to heal... well... you. And it was strange to see. It was like one moment you were the way you were then I just blinked and you looked young again."
He chuckled. He was right. He'd gone from a broken man to hearty and whole in a blink. What an amazing ability that girl possessed.
"So what do you believe her ability is then, if not a healing quirk?"
He paused for a moment, "I have some ideas but they're a bit silly."
"Lay it on me, Midoriya-shounen!"
He blushed and lowered his head. "No, it's kind of stupid I shouldn't have..."
"Nonsense, Midoriya-shounen!" All Might exclaimed. "I'm sure whatever you've surmised may be outlandish, but never stupid. And I've run into some very outlandish things in my years so no matter how odd it may seem, it may at least be worthy of being acknowledged as a valid theory, even if it is something of a longshot!"
Izuku took a deep breath. "I think her ability might have something to do with... time. You don't just look healed. You look young."
Toshinori frowned slightly for a moment. He was right. He'd been so busy just basking in the sensation of good health he hadn't honestly considered it, but now that he did...
He paused for a moment and stepped back, looking at his reflection in one of the windows that lined the hall. This wasn't just his relief taking years off of him, was it? He really did look like a young man again.
As he began to walk again, he could only chuckle at one thing though. The girl had kind of set herself up for some troublesome interactions with his female compatriots. Midnight alone would outright hound the poor girl...
"So what are you thinking?" he asked, looking at the young man walking lock and step with him.
"I think her ability is somehow connected to time..." Izuku stated. "Like she's somehow able to reverse the flow of time on something. Like maybe when she bit her tongue off, she just reverted her body to the way it was before she did. Or when she healed you, she didn't actually heal you, but just put your body into a younger state?"
"So you believe her quirk is somehow able to rewind an object?" he asked.
The boy paused and then lowered his head, "Yeah, it's kinda stupid and impossible I know. I'm sorry I..."
"Stupid? Absolutely not! Impossible, maybe!" he exclaimed with a boisterous laugh, "But in the absence of the probable, the most feasible impossibility becomes the probable! I believe it was Aristotle who said something along those lines?" He paused in thought, "I may be confusing the quote. I'll admit, it's been quite a few years since I took philosophy in college."
The boy blushed brightly.
"Besides, my own former sidekick, Sir Nighteye..." Who he'd absolutely needed to inform about his new state. "He has the ability to see into the future. Compared to that, a little girl who can reverse time isn't that outlandish, now is it?"
Izuku nodded. "No, I guess not."
They continued to walk for a moment before reaching the elevator.
Without pause, he pressed the button for the top floor causing the boy to blink in confusion.
"Wait, why are we going up?" he asked, a small amount of fear making its way to his voice.
"Because we have less than an hour to make it to UA," was his honest response, "We'll never make it in Tokyo traffic."
The boy's eyes went wide with horror.
"Which is why we're going to be driving in this..." All Might finished, timing his words perfectly with the opening of the door.
Young Midoriya's squeal of horror transitioned seamlessly into an earsplitting fanboy squee as he beheld what lay beyond the door.
It had been some time since he'd used it, after all, he didn't travel with others much these days, but there it sat, as pristine and majestic as the day that David Shields had built it...
His personal heroic conveyance...
The Allmobile.
