I know this is supposed to be funny and people are going to find that girl hot, but I think she is a bitch. First she forces the MC to hurt her even though he doesn’t want to just for her own pleasure. Now that is somewhat excusable, considering he doesn’t feel physical pain when doing so. However, turning it around and starting to hurt him is messed up. I think sadism is fine and all, but only if your partner is a masochist. You shouldn’t hurt them if they don’t want it. And I’m sure the guy is a masochist for plot convenience, but she doesn’t know that, meaning she is trying to harm a seemingly unwilling victim without his consent.