True. I think in the previous chapter, when Ethan sees his mother, Elara is already thinking about how to make him cross all possible boundaries, whether it's family or not.The wonders of mind control. Of course, from a narrative point of view it seems too hasty to me as well, although it could be justified as a way for Elara to be testing the limits of the moral and mental corruption she is using on the young Ethan.
I still think that Elara hasn't told Ethan the whole truth about the bond they have now and that she surely needs Ethan to have sex continuously to feed her and increase her power. For now, Ethan sees the positive side, satisfying some sexual appetites he has, but surely at some point in the story he discovers the truth about Elara and that he has to get rid of her.
He still has to sleep with his mother, with the teacher, with his classmate and who knows if PS adds more characters. I feel that this story can go on for a long time, not as long as AU, but a good number of chapters.
The fun will come when he doesn't have to use his powers to sleep with women.