But there is an NTR on/off option early game? Did they scrap the idea or what?
Really? I didn't remember that.
I remember that one of the girls, Mi-Do, is abused by her scummy husband before she has a relationship with the MC, and at some point it is implied that the husband offers her to a guy to pay off a debt, but I don't believe we get to see the actual moment where she is sexually abused. Maybe I always switched that off at the beginning and that's why I don't remember it; it's been a while.
Other than that, I don't think there's anything even close to NTR. Later into the game it's the MC who cucks a guy by fucking his wife in front of him, if you choose to. There's no sharing at all in the whole game.
EDIT: There is no NTR tag either at the top of this page or in the spoiler box in the OP. I don't know.