For the first case, it would really depend on the culture that the work is made for. Some consider (first) cousin to be as wrong as sibling, others consider it completely normal, with still others somewhere in between.
Since the show doesn't treat the relationship as being perverted, we can assume that it the creators didn't intend for it show villany. That keeps it just Kissing Cousins.
For the second, since it is still the same culture I don't feel that Villainous Incest really applies either. The evil part of the situation is the rape part, not the incest. So, we possibly get Rape Is a Special Kind of Evil - depending on how it is played of course.
Well, judging by the way the show depicts his crimes, it clearly does not special focus on the fact that the little girl is his cousin. So, in this case tropes about rape and its terrible consequences are more applicable?
Good afternoon. If the Complete Monster character is in a relationship with his Alpha Bitch cousin, at the same time trying to rape her little sister / his younger cousin, is the Villainous Incest in both cases applicable here? Or, in the first case, just Kissing Cousins is enough, since their connection is voluntary and is not portrayed as perverted in the show?