A Curious Scientist(slightly illegal and highly unethical)

Chapter 5

Izuku hums a jaunty tune as he walks up to the table and places the bottle of Regen Serum on it, before freezing.

"Quite an interesting concoction you've developed, Doctor." A booming voice says from behind Izuku. "You managed to replicate the Super Regeneration quirk without incorporating a single quirk factor into the serum, even Garaki found it nearly impossible to recreate it."

"I knew this would happen someday." Izuku says with a sigh, before turning towards the speaker. "So, who are you?"

The man steps out of the shadows. "I, am All For One." He says, Izuku raising an eyebrow at the strange life support mask that he's wearing. "Tell me, if you can do this much without even the faintest traces of a quirk factor to put into your solutions, what do you think you could do with access to thousands of them?"

After thinking for a second, Izuku shrugs. "Honestly don't know. Depends on what the quirks are and the size of the factor."

If All For One had eyes, he would blink in shock. "Size? Neither me nor Garaki have been able to determine the difference that the quirk factor's size causes aside from the overall strength of the quirk. Are you telling me that you have?"

Izuku nods. "Before I share any of my knowledge with you, though, what do you want of me? And what do I get out of it?"

"What I want of you is simple." All For One says. "I want to enlist your genius mind into my employ. As for what you get out of it? Well, what are your goals?"

"To learn everything." Izuku answers. "It's as simple as that. Any question that science CAN answer, I want to answer. I sell off my experiments to fund future ones, by supplying food for myself and my assistants, and obtaining ingredients and equipment to be used for the sake of experimentation."

All For One grins under his mask. "Then what you get out of this deal is me supplying as much food as you need, as well as any ingredients or equipment that you might need. As a bonus, I will grant you access to my entire collection of quirk factors to use in your experiments and any test subjects that you need."

Izuku grins and extends his hand. "Then as long as you continue to follow through with your side of the deal, I'll remain within your employ." He pauses, realizing something as All For One grasps his hand and gives it a firm shake. "Though, you mentioned a Garaki earlier. You wouldn't happen to be speaking of Kyudai Garaka, would you?"

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"Master, who is this?" Garaki asks, gesturing to the green-haired young man beside All For One.

"This, Doctor, is Dr. Deku, the one who created the Regen Serum you struggled so hard to recreate."

Garaki's eyes widen as he stares at Izuku.

"Tell me, boy, how did you create something that even I believed to be impossible, despite how young you are?" Garaki asks, intrigued.

Izuku shrugs. "I was left paralyzed below the waist thanks to an injury I received from a villain attack, so I went and grabbed a woman left half dead by a different villain attack and tried everything I could think of until, eventually, something worked. It was a long and drawn out process, but it wasn't very complicated."

Garaki hums in thought. "Tell me, what did you use that finally worked? My replica of your serum is less than half as effective as the original."

"Stem cells." Izuku says. "People have been researching how to use them for the sake of human regeneration for over a century, and my serum does exactly that. It temporarily causes the stem cells in your body to go into overdrive, dividing at an extreme speed in order to create enough to repair your body, near instantaneously undoing any damage that is done, even healing old wounds that healed improperly."

Garaki and All For One both freeze at the last part, realizing that, if true, then it means that Regen Serum could be used to fix All For One's wounds that he received from All Might.

"How does it cause that effect, though?" All For One asks. "I find myself curious."

Izuku chuckles. "Well, I can't just give away all my secrets just yet." He says with a smirk. "I still don't know if I can trust either of you, after all."

All For One nods. "Very well. I will ask again when we have earned your trust."

"Right then, now that the introductions are out of the way, would you be so kind as to send me back to where we met? I need to get back to my lab and finish one of my experiments." Izuku says, crossing his arms.

All For One nods, before using a warp quirk to return him to the building they had met in.

"Are you sure we can trust him, Master?" Garaki asks. "He may act calm and composed, but I could see it in his eyes, his mind is far from intact."

"He cares solely for his experiments. So long as we continue to supply him what he needs to continue them, his loyalty will remain ours." All For One responds. "Now then, gather several of the duplicated quirk factors, the terms of our deal necessitate that I supply him with them to experiment on, and I also find myself curious as to what he can do with them if he can create this" he holds up the bottle of Regen Serum "without them."