The only NTR paths are your stepmom and your techer.
-I wouldn't consider the stepmom path NTR because your dad is never there and doesn't love her. It's closer to the hentai tag "cheating" than NTR
-The teacher on the other hand is engaged and her fiancee is present. If you follow her path the engagement is broken and if you don't their relationship seems to get better, but if you like you can choose not to follow this path (I haven't finished this path so I don't truly know how it goes)
I didn't get the path in between Iris and Aiko (I believe is Moloch's daughter) si I can't speak for this path