Just to make things fit, Aizawa and Yamada is aged up by about 9 to 10 years in the future... or something. Or else Enji's going to have his first child born before he turns 18, and that's just...no.

Something I wrote up on a whim, hope you guys enjoy it!

Izuku blinked, eyes opening to take in his situation. He was in UA, it was obvious. Atop a roof of a school building, he could see the school's expansive grounds stretching into the distance, where he could barely see the huge gates.

The last thing he remembered... the boys of 3-A were heading to gym G for hero-training, but he forgot something in the changing rooms and doubled back to get it, and then...

He turned a corner, and was met by a swirling blue wormhole. It took him less than a second to activate Full Cowl, muscles tensed to jump back, but the wormhole reached out and swallowed him, and... now he's here.

Izuku wasn't very surprised, truth be told.

"So that is the situation right now," Aizawa droned on monotonously.

"Until the support course can get their time-slowing device under control with that student with the time quirk, time wormholes would be appearing at random throughout the school, but mostly focused on the support building. It would only bring you forward in time for a few seconds or a few minutes, but just in case please carry around these time-trackers with you."

He showed everyone an advanced-looking pocket watch.

"It should only be a couple minutes into the future, 15 at most..." Taking out the specially designed pocket watch everyone was handed after the announcement, he flicked open the protective covering and let it start to configure the present time.

"Aaaahhhhhhhhhh! Look ooooouut, Mister!"

Something blue and yellow fell from the sky, and on impulse, Izuku reached out to catch it. A student with a mess of floppy blond hair dropped neatly into his out-stretched arms.

Izuku first noticed the oddly familiar style of blond hair, with two long side-bangs and messy blond strands sticking up haphazardly at the back. Then he saw the sky-blue eyes.

"Hey, thank you for catching me!" The student gave a thumbs up but immediately yelped when Izuku dropped him onto the roof.

"What?! Hey!" The boy exclaimed, in English with a very familiar accent.

Izuku took a deep breath. This is not possible. This is impossible. Impossible!

The pocket watched he dropped when catching- catching... - no I will NOT think of it- beeped. Izuku picked it up.

"..."

"UWAAHHH!" 23 years in the past?! That- no- WHY ME?! But if this is the past, then there are rules to time-travelling of this magnitude, isn't it? I mean-

"-taken into account the butterfly effect or the ripple effect the separate axis timelines could break apart and link to another, but then how will I get back? But maybe there is no difference and it just clears the future timelines into a new timeline and then everything would be wiped and I will still be stuck here, not to mention the timeline imbalance could shift the world and cause deviations that could potentially destroy the world, no, maybe even the universe, and kill everyone! But in that case, everything would be reversed then wouldn't we cease to exist and therefore cannot be born and then technically cannot be killed..."

"Excuse me, mister, but what are you doing?"

Izuku snapped his head up at the familiar voice... to see the top of a bright, blond head. He tipped his head down. Curious blue eyes stared back at him.

A young Toshinori Yagi blinked at the weird green-haired upper-class man.

"Are you here on your lunch break? Isn't it kind of dangerous?"

"Ahem." said Izuki intelligently.

I can't speak to someone who knows me! Or will know me! It could destroy the world!

"Toshinori! Get back here!"

The All-Might-to-be squeaked, squeaked, and bolted behind Izuku.

"Hide me!"

What-

"Toshinori I swear to god-dammit, get down here or I'll !"

"I'm sooo dead... I'm going to die, I'm going to die..." Not-Yet-All-Might kept chanting under his breath. Izuku was momentarily stupefied.

There was a resounding crash! and a mysterious fwuop! followed by a squelching gloooooop!.

Then a booming "TOSHINORI!"

He held his breath, waiting for whatever or whoever was screaming to climb up the roof. There was cursing aplenty, but it didn't come any nearer. Disregarding the hunched figure squatting behind him, never mind that Izuku did nothing to hide his broader frame, Izuku inched towards the edge, and peeked over at the person down below.

The man waving a fist in the air, screaming up at him wasn't someone Izuku was familiar with. He was covered from head to toe in what seems to be... tar, feathers, and glitter. A neon pink balloon was stuck to the back of his head. The man struggled, but was apparently stuck fast to the floor.

"Who...?"

"TOSHINORI-! Don't make me go up there and get you- I know you're there! I'll count to three! One, two, THRE-"

BOOM!

Izuku reared back at the shock wave of the explosion. Alarms started blaring like crazy. He could see yellow, red, and blue smoke rising the next building over. Isn't that class 1-A?!

There were screams in the distance, getting louder and louder... was that? Singing?!

"Shit. He did it, he really did it. Sensei's going to be sooo mad..." Toshinori muttered.

A series of explosions sounded from the classroom, reminding Izuku of Bakugou whenever he's in his moods. If Kacchan was here... Izuku stopped thinking, lest his mind conjures up horrors as yet unseen by mankind.

Flashes of revolving neon light beams light up the whole classroom, and there is vicious green goop dripping out of the windows of the classroom. A student who was on fire crashed through the window with a horrified scream, but was snatched back into the room by... a whip, quickly followed by a yowling sound of a drowning cat.

To hell with timelines.

"Wh-what's happening? Is that your classroom?"

"Y-yeah...We're kinda celebrating Yamada's birthday right now."

"That's a birthday party? What about your teacher?"

"TOSHINORI! I'm going to make you regret that you were ever born! Put you through the wringer so hard you meet your ancestors and drag you right back to do it again and again and AGAIN! COME DOWN HERE!"

Toshinori whimpered.

"Who's that?"Izuku asked, though he already had an idea who.

"I-it's my homeroom teacher... I got the short straw to play bait so he wouldn't be in the classroom."

This was what All-Might was like?! And down there, Izuku turned around to stare disbelievingly at tar-covered man screaming up at them, you're telling me that's Gran Torino?!

"We didn't mean to go so far... but then Yamada challenged Aizawa and Nemuri to a karaoke contest, but Aizawa refused, and the other girls vetoed Nemuri's stripping dance-off, and then somehow it turned into a prank war, which Aizawa accepted, and Yamada went crazy and half the class was arguing on who's supposed to be the target, and then Enji pissed Aizawa off, then, then-"

BOOM!

"YEEEAAAAAAHHHHHHHHHHHHH!"

Izuku covered up his poor ears. Some crows flying overhead dropped down, dazed and probably deaf.

Toshinori yelped, covering up his own ears. "It was supposed to be small, harmless pranks only!" he mouthed mournfully.

So... what'd you think? Should I continue? Any ideas/requests are welcome! I'm aeryannef on Tumblr.