Now, NTR is basically a porn subgenre for japanese people. I think any attempt to definition would be lousy, but it usually implies humiliation. It's NTR if the 'victimin' know and withess, and usually gets shamed and humiliated both by the girl and her lovers.
So i'd go with the cuck thing.
If it's consensual and it retains respect, shouldn't it be NTS? Again, hard to produce a clear definition.
And honestly, by the end of the day, who gives a fuck?
Awesome game,i love it.Hot,likeable and interesting characters(Suzie is love<3),beautiful backgrounds and an intriguing story,keep cooking man!Can't wait for the steam release.