The only ntr scenes I know of are Yarra & Qum and the gathering orcs, Yarra & Qum and the ogre, Qum and the Succubus guard, dominated Varia gives a bounty target a distraction blowjob in Megail's route(reshaped Varia just knocks him unconscious before he can escape) and Nalili takes part in the Second Gathering orgy, though she primarily focuses on the Anak's second Xestris whom was uncomfortable and didn't want to be there, so Nalili comforts/protects her(and gives her gentle and consensual oral sex). The tentacles come back every now and then, though they're primarily Aka and Nalili's fetish.