Hi! I understand your frustration, but for now I don’t plan on making a route without NTS. However, in the future, once the game is more developed, if I see that most players want one, I’ll consider making it. Thanks for your opinion!
NTR is about betrayal, where your partner cheats on you. NTS is the opposite, you actually enjoy watching or knowing your partner is with someone else.
No, NTR is straight up cheating, NTS is more like one-sided swinging. If the husband/bf is aware and has approved, it's not cheating and not NTR. However, many NTS stories do turn into NTR if the woman starts going behind her boyfriend's back