I yoinked this after seeing it... The answer.. no its not NTR. Even if shes part of hte MCs harem, she is doing a job for the MC and the MC is aware what shes doing and what lengths she will go too. Its all in his best interest. And with a more sexually active or loyal personally, is how much it gets her through the moment. There is other context that goes into it, but we just talking it on a base level. The problem here, is that F5zone users here have invented a new NTR or misinformed what NTR is. So lets call this F95NTR. Thats the more suitable tag.
NTR at its very core, is a form of betrayal. The LI who inflected negative feelings on the MC such as cuckhold, humiliation, wothlessness. Mostly leaving him for a better choice in man. She deems him unworthily. Betrayal really is the best way to put it. You feel the pain of loss after a betrayal. Tho it is a kink for people to feel this emotion, otherwise it wouldnt be as popular. Is like masochism. I dont understand it, but it exists.
I honestly feel sorry for you devs that have to put up with alot of cringe and misinformation. But I wish you guys stay strong and keep doing what you do without the bullying.