Don't know what you mean. But ntr is different from simple rape. Although the Japanese really love to put rape everywhere, the ntr bit is where the victim stays for more or is "converted" into a slut or something. In this game, there's no such thing, which is why I mentioned them but low-key disagreed it's proper ntr, just rape.
If it happens, Robin won't go around looking for extra trouble, the opposite, will be traumatized. Whitney isn't heard asking for more if you get rid of the bully. Don't remember Sydney, only played it when that character just got introduced with their story.
Avery might have others on the side, but considering how busy they are and possessive towards you, they might not have time to play sugar parent for anyone else. I am not really into bestiality so haven't touched the farm thus can't tell you about it.