Genderbend issue (yaoi) mha roleplay

My idea for a erp could pass in the bnha/mha

(My hero academia) universe.

There would be a oc x character erp.

I'm going to use a oc btw, nothing to hyper in size or whatever.

I'm wanting to do a romance inclined erp that has a character in a heat like state once they become something not that much human but also genderbend.

So for the ideas I have 2 of then and In all of those ideas 1 or the both of the characters could become those said creatures:

((The character was someome that belokged to another dimension similar to ours but got yanked into the mha world out of the blue, that Brazilian without knowing what they could do, worked hard and used their own inteligence to get around this world and have a stable life and even get to become a student at ua))

The incident Is only told to have altered the gender of this person now, they are a very calm and gentle individual that likes to chat with people but has a shy side to it but now this person is a guy))

Idea 1: Jess has been acting off lately, something is strange with then, the teachers said that he was involved into an accident and to not pry to much into it but you are still curious and worried about then, their behavior is completely changed, they are still the same but something is truly off, Jess is trying to do the best to hide away the truth from anyone, ashamed for this new appearance and form, but what happens when their crush comes to find this out?))that now they aren't human anymore but a incubus, a monster, a demon, a beast that needs sex to feed themselves, that even after all those times, he stayed by himself and tried to avoid any near close interaction with anyone, but his beauty was luring, he hid it very well but not well enough.

Idea 2: the character did suffer an accident, they only think that it's a genderbend thingy but there is more then it meet the eye, suddenly he has started to drink more water, his beauty was outstanding, his voice was melodic and calming, there were times that he couldn't be around, he avoided water as if it was the plague.

What happens when someone finds out the truth, that Jess wasn't a human as they initially have though but actually a siren, and that accident has brought this dormant side to be awaken.