I get what people are saying and I'm not a fan of NTR either. I guess I just have a more strict idea of NTR than some people. For me at least, unless the girl is in a relationship with the MC or is related to him in an incest game or something like that, I don't consider it NTR. This is basically a stranger having sex with someone who isn't you. Granted, the fact that is was the MC's asshole father figure is a bit cringe inducing, its still not really NTR. I wouldn't assume every girl the MC meets is a virgin, so by definition they have all had sex with people who aren't the MC. Does that make them all off limits or not sexy anymore? No, not for me at least. Plus it is just a game with fictional people and Monica is still smoking hot, even after dream cheating, in my opinion at least.