I'm not an NTR guy either myself, but these 3 games were really enjoyable for me (Listed in the order I played them). I like #1 and #3 best, but #2 was still entertaining.
Power Vacuum comes to mind first and foremost for me. NTR happens if you made "bad" choices.
A Family Venture is another, where others try to take advantage of your family (LIs) if you choose "incorrectly."
Sexbot has NTR that is part of the plot, but it's not "canon" and can be avoided without ruining the story, although some achievements for characters depend on it (you won't miss much if you don't get them)