As someone whom is neutral on the whole NTR thing, I gotta say, So far it looks like essentially a guide on how not to swing. I mean currently it looks like a clearly poly comfortable younger couple having fun swinging with a very confused & conflicted somewhat older monogomous minded couple. I mean yeah, I guess the NTR tag might be relevant if the male NPC pulls some form of "stealing the MC's wife" maneuver, of the MC decides to stop it but the other 3 decide to continue as some kind of NTR triad, (which, as someone who's poly myself, I would find annoying but meh, it's a "game" [game is in quotes because as a VN, gameplay or lack therof is a thing]), but even in that scenario, pulling that kind of shit on your boss would be rather full potato retarded because if I were his boss & he tried pulling that, I'd shit can his ass so fast his head would spin. Then again, I'd also be smart enough not to try being poly if I & my wife couldn't handle it in the first place. Anyway, barring that kind of outcome, I really don't see this being anything other than people whom shouldn't be swinging trying to swing.