i mean... you're preaching to the choir man... we know it won't be NTR that's a given, the mother will never cheat on the husband and all this "development" is just for comedic purpose and baiting (also giving doujin writers material in a silver platter).
I mean.. i see more chance of the sister trying to get into his pants than the mother....
I'd rather see the other couples developing for once like in... (jesus i forgot the manga name the one where one of the male friends has shark teeth and wants to be an artist..., the one where the current chapter with nitta everyone hates as it's shit)