(A/N: Y/n is already dating 5 of the 6 harem girls. He's in an open relationship with each of them. The ones he's dating are:
•Jirou
•Uraraka
•Mina
•Tsu
•ToruHe'll start dating Momo at a later date. They are also all aware of each others existence but have never met or talked. Also, this may be retconned to fit the story.)
All Might: I deem you worthy of my power. My quirk is yours to inherit.
Y/n: Excuse a what now? What do you mean "inherit"?
All Might: You should see your face right now. Don't worry, I'm not gonna force this thing on you. Listen well, young man. This is your choice. Do you wanna accept my awesome power or not?!
All Might coughs up a fresh batch of blood.
Y/n: < What is this guy talking about? You can't transfer a quirk. >
All Might: There's are a couple of things you should know about my abilities. Journalists always guess my quirk is super strength or some kind of invulnerability. When people ask in interviews, I always make a joke and dodge the question. That's because the world needs to believe that their symbol of peace is just a naturally born hero, like any of them. But I'm not. There's nothing natural about my ability. I wasn't born with this power. It's a sacred torch that was passed on to me from someone else!
Y/n: Someone gave you your quirk? No way.
All Might: Yes, way. And you're next. I can give you my abilities.
Y/n: Hang on. This is a lot to dump on me all at once! There is a lot of debate as to what your quirk is. It's a mystery! Even to government officials. But, well, the idea of passing on a quirk or inheriting it just doesn't make any sense to me. I've never heard anything like that before. Powers are supposed to be unique to each individual. Since the first superpowers, no one has ever been able to just give someone their power like a present. That's crazy. If it's true, then it'll cause us to re-think everything we know about quirks to begin with.
Y/n continues to speak as All Might stands confused.
All Might: Uh, sounds like you're overthinking this whole "inheriting" thing.
Y/n continues to mutter as All Might gets sick of it.
All Might: Stop nerdin' out!
Y/n stops as he realises what he is doing.
All Might: You'll have to adjust to your reality and accept this new truth! I can transfer my quirk to someone else. And that's just one facet of my secret abilities. The true name of my power is One For All.
Y/n: One... For... All.
All Might: Yes. One person improves the power and then hands it off to another person. It continues to grow as it's passed along. It is this cultivated power that allows me to save those who are in need of a hero. The truth behind my strength.
Y/n: But. Why me? There are people with much stronger quirks. My friend can literally secrete nitroglycerin and blow it up, for god sake!
All Might: I was on a long hunt for a worthy successor. And then, I watched you jump into action as the rest of us stood idly by. You may not think much of yourself. But you tried to save that kid. You acted like a hero. Also, we'll need to work on your confidence if you want my quirk. Come one, kid.
Y/n: < All Might. He went through the trouble of telling me his secret... how can I turn him down. > Okay, I'll do it. Yes!
All Might: No reluctance! That's exactly how I figured you'd respond.