Chapter Text
As his successor, Midoriya Izuku, dragging an old tractor tire for another lap before tossing it to the dump that All Might Coorporation just created in Takoba Beach, All Might had a realization:
Even if Young Midoriya trained himself as hard as he should be, it's likely he'd still blow up his muscles so much he might gone to comatose after his first time using the quirk. At just 3%.
And why wouldn't it? He was a 7 feet, fit young man even before receiving All For One, and he used it to almost full power very quickly after he received it. And yet had he received One For All in its current stage, he was sure he'd crack all his bones if he went above 30% on his first day. And now he's going to give it to someone so young, and-no offense to his newest disciple-a nerd who's shorter than half of his classmates?
And even if Midoriya gained all those muscles necessary to gain, as well as the second growth spurt that could still happen in the university, he'd still be far shorter, far less muscular, and far less trained than him, even with his current hulking up self already lost 30 pounds. Actually, scratch that; had he's actually even just decently in shape, the training could be shortened, and he might be able to train his protege for several weeks before the exam. But alas, now everything about his pre-quirk training needed to be run on very tight ship just to make sure he would receive the quirk in time.
And that' s not even taking the fact he also realized that his successor truly needed to be at his best to even get to one of the greatest hero college in Japan. Sure, the exam would have secret heroic points, which his green-haired successor would succeed at even if he couldn't do anything in the main tasks to get the practical points. But he still couldn't risk of permanent damage to him if anything went wrong. Especially since Recovery Girl only enhanced natural recovery, not giving instant healing. And he knew that some body parts, like meniscus and knees, would remain damaged if they're truly that damaged. And if he blew up something delicate, like his knees using the quirk...
"This...might call for a drastic measure."
The man's eyes stayed focused on his young protege, but his mind gone to two places: how to help Young Midoriya further in having fit enough body to handle One For All, and how to accelerate his growth so he'd have enough time to train before his exam. But he couldn't call Mirai; Nighteye definitely would scoffed at his choice of successor over the ace sophomore of U.A., Togata Mirio, especially with their relationship still strained over his premonition of his death; he knew so far it'd always happen, but damn it, he'd try defy it! And that old man Torino...the memory of him under his tutelage still made him shudder, so no way he'd traumatize Young Midoriya so quickly.
Then it hit him:
His old sidekick in the strongest country in the world, America, where he became a hero for several years: David Shield. He might had connections in making him some of...
"YES! I know the solution for this problem!"
"D-did you say something, All Might s-sir?" said his successor, all muscles strained and breath gasped before he dragged a piece of massive engine.
"Ah, just rambling of old me, Young Midoriya. Keep pulling that truck engine, you're doing good, my boy! YES! YOU CAN DO IT! PLUS ULTRA, BABY!"
Izuku gained enough energy for his second wind, and his mentor cried in joy.
"YES! Next morning, we're going to the gym for more localized muscle growth! For every 20 pounds of lifting increases, I'll crush the next biggest pile of metal in the beach for easier pick!"
Izuku pulled even harder, and All Might cried the manliest tears.
"...I'm sorry, what did you say again, Toshi?"
"Yes, Dave. I need to know what's the side effect of giving performance enhancers to the kid who going to inherit my Quirk. Legal and otherwise. While I'm sure of his character completely suitable as a hero, his current muscularity would not be sufficient to even handle 1% of my strength. And the faster he could get in shape, the faster I can teach him my technique and see whether he could fully fit my fighting skill, or whether he needed...another teacher that suited his style better."
David Shield didn't know what to do with this information while his old friend shuddered at the memory of Gran Torino. Toshi's quirk could be inherited to people? And he's currently training his successor? W-was that the real reason why his quirk got weakened, and not just because of his injuries?
Well he might still needed to get that amplification device back just in case the Midoriya kid needed it in the future, but with this information, he might not in hurry for it anymore. Perhaps even he could get it back with a legal method. Like lobbying with help of Star and Stripe, or making a limited version of it. It'd take time, but at least he won't risk anything illegal and arrest.
In fact, if he's this open with him, maybe...just maybe his old mentor would more than eager to help with getting his invention back.
But first, Toshi needed his help, and he'd more than happily provide it.
"So what he looked like?"
All Might sent him the picture of Midoriya Izuku 3 months before.
He was a toothpick, a string bean of pole, a young man who looked like a breeze of wind would knock him over. And it looked like he just cried over some boo-boo, or even got triggered by a snide remark by Toshi.
"...Yeah, he needed everything, alright."
"So you agreed-wait, but what about his health? I remembered how many classic mass monsters bodybuilders died prematurely before their 40s!"
"Don't worry, Toshi. I'm an inventor, and I know many heroes with supplemental quirks that still need to fight normal. And of course, they're using something to keep themselves above Villains, which is more than just some legal Trigger drugs. I shall contact them and make a PED cocktail that's both powerful and safe to use...relatively, of course."
"Oh, thank you so much, my old friend!"
"I also will make an artificial stomach and lung for you. You still won't be able to eat hard foods without synthetic digestive enzyme, but at least you may be able to eat thrice of your current food intakes. You deserve more than spending the rest of your retirement as a skeleton who can barely breath."
He could hear the gasp of his old friend. "You mean, I could actually feel healthier and a bit fuller all this time if I just be honest with you after my battle with him?! Oh if I'm gay, I would fly to your house and kiss you there before the sun set!"
"Yoshi, please. I have a wife here."
"Young Midoriya! With this, I deem you worthy of One For All!"
It was finally done. After he gave additional instruction of what Young Midoriya needed to take himself further beyond (including BCAA, creatine and whey protein), he managed to clean the beach 4 weeks ahead of schedule, and he's so proud of him for pulling it off. And judging by the smile of his freckled successor, he felt the same way too.
But still, he looked at the young man who's still barely taller than average Japanese, then compared to his peak physique...it seemly won't be enough to reach even 5% power of OfA. Not if he needed him to take over his mantle as fast as possible.
Good thing that his old pal already finished the PED cocktail. And even better, that artificial stomach allowed him to eat thrice the amount of foods, even if he still couldn't eat something as good as medium-rare steak.
"Now...drink this!"
The freckled young man saw a bottle of drink on one hand, and several capsules on the other. "Uh, what are those, All Might sir?"
"It's my, ahem, performance enhancer for yours truly, and you need to drink it together with my blood capsules."
"...Blood capsules?!" Ikuzu wasn't fully weirded by concept of PED usage on heroes; he knew so many people suspected Endeavor of microdosing on 'Super Trigger' and other enhancers. But blood? He knew EPO wasn't ingested, so what's this for-
"This quirk's passed to other via DNA ingestion, so..."
Finally, the future holder of OfA realized what the capsules were for, and he's flabbergasted. "A-a-are you telling me I need to drink your blood, sir? I thought you're going to beam me with a secret power or something!"
"HA! Good one, Young Midoriya. But seriously, it's either this, or eating my hair. Unless you think eating my hair is less gross than drinking capsules of my blood-"
"N-no, no. Drinking capsule is better than your hair," said Izuku while he grabbed both the drink and blood capsules, shuddered at the memory of that one time he accidentally sniffing the hair of ultimate hero of Japan.
"Now come on. Swallow up, boy!"
All Might gave it to Izuku, who quickly swallowed the whole thing with disgust.
"Okay! Now, with your base muscularity achieved, you can get further beyond...with helps!"
"H-huh? That wasn't drops of steroids, All Might?"
"Nope, just protein shake! On the other hand, these two are!" All Might shoved two labelled syringes and a briefcase full of them. "Now, it's your choice, young man, whether you simply want to use HGH and Testosterone on the left, or Trenbolone and Trigger on the right. But I'd advise you to use the safer one first after you felt the power of One for All flowing through your vein. And if you run out, this case's filled with these two type of syringes."
"W-would I get in trouble if the teacher in my choice of UA University found out about it?"
"Not with the receipt on the briefcase," good thing Japanese society have relaxed on drugs usage after nearly 200 years of constant chaos from the rise of superpowers. Otherwise he'd get jailed if anyone know about it.
Izuku received them and bowed to the hero while thanked him for giving him a chance, and quickly ran to his house with happiest smile on his face. while All Might happily waved back, fully trusted that his replacement would be more than ready to fight for the world peace.
Albeit, considering how he had to threaten to stop train him after he found out the young man was using his break days to train, he had a little bit of worry that Young Midoriya would recklessly used his roids.
He shrugged. "Eh. What could possibly go wrong?"
The next day...
In the morning, the mother of one Midoriya Izuku, Inko, was about to make their breakfast, when she noticed something coming out of Izuku's room.
"Smoke? Coming out of Izuku's room?" quickly, she gasped, "Oh no. I've told him to turn off his computer once in a while and now the thing's going to explode!"
With speed that she never thought she kept after her weight gains, the green-haired mother grabbed a bucket full of water, and quickly ran to the door of Izuku's room, hoping that her poor boy's already half-awake.
"Izuku, open the door!"
"Huh? What is it, mom-GAH!"
"H-huh?"
Inko realized that the smoke came from Izuku's body, not the computer as she assumed. Just what was going on-
When her poor, drenched son stepped out of the room, he barely managed to stop his mom from falling on the floor.
After four years of anger management therapy (and relentless drilling from old hag of his mom that weak people who still wanted to help were just good Samaritans, not people who looked down on him), Bakugo Katsuki's friendship with Izuku was saved, he's safe from detentions in juvenile hall over throwing all those nitroglycerin sweats on his old pal (and many random people who offered a hand when he slipped), and he even looked to become the greatest hero in history with his childhood friend as his trusty sidearms sidekick, like All Might and David Shield.
And yet...in today's dinner, he saw his old friend magically grew so many inches and became more muscular than Part 3 Kujo Jotaro. After previously played an online game together two days ago, with his camera showed his then-still thin build. He knew Izuku got a bit muscular this year, but...this?
He looked like the greatest cosplayer for All Might. And at least a foot taller and 100 pound heavier.
"So you turned out to have a fucking quirk."
Izuku nodded while the rest eat their food awkwardly, not knowing whether Katsuki would be raging after learned about the hidden quirk or not. Even after anger management classes he's still not fully tamed as a person.
"Your quirk is basically making you able to quickly absorb performance-enhancing drugs into your system with heightened benefits and nullified most of those side-effects."
Izuku nodded again. That was what Recovery Girl gained after running tests on him. The only side effect was a temporary aggression increase, and only if he took excessive amount of tren.
"After you trained with a trainer to get fit into the course for UA University, he gave you several steroids that's only 'legal' if you're a top 50 hero, and foolishly, your crazy self took the harder PED before you sleep, after you took goddamn HGH and TRT in afternoon. And instead of went insane, the Trigger... Transform your body into a fucking bodybuilder in just one cycle of sleep."
Izuku nodded again, while got anxious over whether the Bakugo household would take his words about how on earth he got so muscular in less than 24 hours; Recovery Girl claimed she'd seen weirder shit, and this incident did gave him a cover over effects of OFA that likely amplified his inner Quirk, but-
"Can I talk to your supplier?"
Everyone in the room spat their food.
"T-the hell, Kacchan!"
"Fucking hell! I WON'T LET MY SON TAKE DANGEROUS DRUGS, YOU FUCKING BRAT!"
"SHUT UP HAG! I NEED EVERY EDGE I COULD FUCKING GET IF FUCKING IZUKU LOOK LIKE A GODDAMN NINJA TURTLE VILLAIN!"