I'm a nobody here, I am a writer and I am in the process of producing my own game a long time away. This topic and your themes interest me quite a bit. I like the kinks you have, so I will add a suggestion, take it or leave it. NTR is a difficult thing to do well, but I have found in my own writing and with the games I have played through, that a more gradual and subtle approach can be much more rewarding as a player.
The longer the build up the better the payoff, as long as you deliver eventually. A few hints with minor payoffs is a good way to keep the player's interests. Having the two main love interests jumping right into the cheating in the very first chapter sort of circumvents any build up and kind of dissipates the tension you are trying to build. I was thinking at the very least the "slutty" female character would probably be the one to act slutty right away and to keep the complainers happy until your less "accessible" and therefore more attractive female characters began the process of corruption. I mean you can only escalate so far once the dirty deed has been revealed. It's sort of like a horror movie, if you show the monster right away, it stops being a horror movie.
Nevertheless, you have my interest and I will be following. Thank you for this game.