@Kumakamikaze: You said it's NTR if Tadano "gets the MILF". That's wrong. He can get the MILF without it being NTR, if she still loves her husband and still enjoys doing it with him.
@nightmoves17 while he did ask her for advie this is in cotext of Valentine's. This chapter was referencing he was asing about advice after summer festival.
@flyingbonbon: Not exactly. Cheating is merely the first step in NTR, but is not guaranteed to lead to it. I've seen more than a few hentai that involved cheating without involving NTR; usually it's because the cheating spouse (husband or wife) is the dominant partner in the cheating. NTR pretty much always involves the "outsider" morally corrupting the cheating spouse until they either willingly abandon the other spouse or they turn into living sex toys that offer no resistance whatsoever to anything the outsider does (and may not even remember their past life, having been mindbroken in the process). Which goes back to the etymology of NTR, i.e. the cheating spouse being "stolen" by someone from the other spouse.
@Kumakamikaze: You're assuming that Komi's dad isn't as much chad as Tadano is in this scenario. Maybe Shuuko wants double the chad in her love life.
@0181sam: Yes, it originated as a subgenre of hentai. The discussion we're having is framed as a hypothetical hentai scenario involving Shuuko making advances on Tadano despite being married and knowing that her daughter is in love with Tadano (who also reciprocates, but neither knows it's mutual).