Assuming Rin was of age at the time of the beginning of the sexual relationship, that sounds more incestual than pedophilic. If the drive was pedophilia, would he even still be interested in her when she was of age?
Pooh brought up that its even worse because it's bestiality, but really Sesshy literally didn't do anything his own father didn't do..... Demon having sex with a human creating half demon/half human Inuyasha. If it's good enough for his dad, then it's good enough for him, right?
Without scrolling up, someone but I can't remember who was kinda overstating the grossness between Inuyasha and Kagome's relationship.... If I remember / understand correctly when they first encountered each other Kagome was 15 and Inuyasha was 18.... sure in our society that sexual relationship lands Inuyasha in prison but it's still like a high school senior dating a freshman / sophomore at the same high school.