Several hated the boy in the first chapter for his way of being and design, but the one who decides how a character should be in the story is the author or director. I think everyone wanted a sequel teacher/shota and not this. In the conversation the boy tells him why they had sex, she evades him saying that he loves children. I already had the feeling that she was a whore, only interested in having sex with either men or women. I think he's even able to be with several of his students or old fat guys at the same time if there's a third chapter.
You are contradicting yourself a lot @hayatov18 . First you said several hated the boy and then everyone wanted a sequel teacher/shota (so the same thing as the first one). Personally i didn't like the shota at all too. Also you are really confusing with your "he", i think you meant "she" more than once. But again i'm not sure about the whole whore angle. The scene in the credits where we see her younger while she is being fucked looked more like she was being raped to me too.