Yeah, I was thrown by the "dumb question" remark. No worries. I understand the situation better now. It sounds like you have a good friend on F95 in Merlin-Magic. Cheers.
Some. Nora would be for one, if I have to point a finger at one of them for sake of example. And no, there is no ''round and about''. Main LI's are main li's and they're with Main Char. NTR is not my personal jam, not something I like on my own, thereby I do not meddle in it or bother writing about it. That being said, I'm aware of some planned scenes where main character does sleep with other people's wives, but, as far as my research goes, that isn't considered NTR or does it affect MC in such shape or form. As for "mentioned" in text... doubtful. When doing character backgrounds and their past, their sex life is last on my list if it AT ALL on my list. I don't see reason to narrate through it. Some things I leave to player interpretation. Hope that helps.