"HOLY WOAH." Izuku was dumb-founded. After the first day of training with All-Might, he had put on what looked like twenty pounds of muscle already! His abdominals looked clean and cut, the same going to for the rest of his brand new-body. He wasn't clearly wasn't the punching bag of Kacchan anymore–at least physically. Mentally, this shocking development started to weigh on him. This wasn't normal. Not natural. His quirk hadn't shown its weird head until recently, so he didn't quite know all of its abilities. It had never affected himself before. I mean, unicorns were bizarre enough that it didn't really matter to him, but this could potentially permanently affect his biology!
Immediately, he dialed All-Might's number. "OH, HELLO, YOUNG MIDORIYA! WHAT SEEMS TO BE THE—"
"I-I'M BUFF ALREADY AND IT'S ONLY BEEN ONE DAY!" Izuku half-screamed through the side of the phone. "I think it's my Quirk—It's adapting to the training! Terraforming my body instead of making me slowly work for it like a n-normal person! Before–I could see my own ribs, but now all I see is muscles!" A long pause filled the air. "All-Might? ALL-MIGHT!?"
Suddenly, a large figure burst through the window. "I AM H–" Instantly, Izuku's muscles moved on their own, slapping All-Might in the face and sending him back through the window. "-EREEEEEEEE!" He screamed as he fell into the parking lot next to his mother's apartment.
"OH GEEZ, I JUST SLAPPED ALL-MIGHT!" He hopped out of the window, almost instinctively and ran towards the number one hero. "ALL-MIGHT, ALL-MIGHT, I'M SO SO SORRY!" His eyes widened as steam ran off of All-Might's body.
"You sure do pack a wallop, kid." A skeleton of a man stood up. "Yes, I am the real All-Might." Izuku's mouth would have hit the floor if not for All-Might's quick answer. "After an extreme battle, I injured myself gravely. This is why I started to train you, Young Midoriya. So that you may have become the successor of my power—but I now see you don't need my power regardless. Your Plot Armor is something that if combined with my Quirk, One for All, would be so powerful—it would be uncontrollable."
"W-Why are you telling me this?"
"Because despite your overwhelming strength, you still have a spirit of hero. Never forget that, Young Midoriya." He started off in one direction after pulling a piece of paper out of his pocket. His blue orbs stared at it for a moment. "Keep pushing your limits…"
"Where are you going?"
"To give someone else a chance to fight. If you what I tell you—" He smiled, "You'll see them at UA as well."