Well it’s cheating but isn’t it only NTR if it shows the husband being upset or like naively unaware in the room next to them bc based on what she said he wouldn’t rly care , since ntr is a “specific” caveat to cheating
Just be a good partner lol, other than the other woman” being dazzling , Mc did specifically say “he won’t notice” , altho granted he had a reasonable purpose of working versus like lying about it and having an affair himself as those things tend to go