That's a nice suggestion. I also thought of adding a unique "Bull" POV chat to the game where a girl cheats on her boyfriend with you by sexting the player. But right now I don't want to stray too far away from the NTR theme of the game it's a NTR phone after all. :)
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.