I left it out cause its irreverent the only path you can do (without a game over) is letting her get groped then you step in, Agian even if she was fuck still not NTR as you point out below
I never said it had to be a "monogamous relationship" i said a relationship of some sort be it monogamous, poly, open, just a love interest, etc. but you want to completly just disreget the actual meaning of NTR to "interest/jealousy" then, neither of those apply either the MC has no love/sexual interest in those characters nor does he get jealous of those scene, he cares nothing about those girls.
So what is your argument here? when even by your own "definition" of the word doesn't apply
Thats rich comming from someone who doen't actually know the defintion of NTR and just making up a definition. that fits your needs simple because you don't like something, Just because you believe something should mean something else doesn't make it so
EDIT: No need to rage in my PM's buddy Lol