That actually sounds very interesting, but it doesn't stray from the NTR aspect that much, I'm talking about the "bull" pov you're talking about.
Another Suggestion personally from me is another girl, a friend of the mc, wants to cheat on her boyfriend and asks him for advice on how to since she learned that he allows his gf to bang other dudes.
It could work on different paths and endings, like you help her find a dude or instead she cheats with the dude for the mc. I know it sounds kinda scuffed since I'm not really a master about NTR stuff.