The unrealistic part of this is that if you were a guy and attracted to someone. You definitely wouldn't be able to fall asleep next to them. Unless you're running miles in the day, there's no way a guy can sleep horny and we get horny over less.
Honestly, seems quite toxic because if you actually start changing yourself to be better one day. Guess who will the be biggest obstacle now. It's like a psychotic narcissist using you to please her superiority complex.
So this is a light novel with 90 chapters lol. I skimmed a Chinese translation "for science" and yeah... it's incest -> non-incest -> incest -> incest and non-incest. The MC is a machine, built for the sole purpose of squirting out white liquid in everything and anything that moves in the story...
I'd have to say she sounds absolutely psychotic. This yandere chick making the situation worse than it is, makes it seems like she killed the people in the shelter, after sabotaging a rescue attempt and imprisoning her temporarily.