How much of the game is NTR? downloading anyways but eh
2 scenes, Green X Zeleshi, which can be circumvented once the harpies main quest is complete and you're going steady so to speak, just ask her to stop accepting new challengers. Then there's Bilia X Warren, which has to be rube goldberged into place by the player.
Been a minute since I answered this question more fully:
NTR is generally going to be in these one-off scenes, gonna let supporters vote on the next one soon actually, in a specific characters dedicated stag/vixen story branch, and be a heavy subtheme of the final conflict (which presumably you don't purposely fail to get extra scenes). in the final conflict a couple of side characters will come under the badguys spell as you rush to save the town, and then you will get the option to save or fail other characters before choosing an ending.
just as more of a side note. the people who are really aggressively "if the character has an NTR scene they are ruined" or "any characters having sex without the MC is NTR". Don't play this game, play something else, I'm not going to cater to you nor do I want to. I also count your facepalm emotes and two heart emoji in my spreadsheets.