Misunderstood? lmao, I didnt know you were such a ntr appreciator/connoisseur, I'll keep that in mind for your other games as well.
But ntr/swinging/sharing is the same to most people who dislike that kind of stuff. In fact, netorase (which is swingin) is just a subgenre/variation of ntr and it is aimed at the same crowd who is into cuckoldry: either unwilling cuckoldry with ntr, or willing cuckoldry with swinging. Also, you said that your game has one ending which has implied ntr (wow, what a surprise...) so you are not wrong at promoting as a ntr game and having the ntr tag (which, as I said wouldnt make it much different from a game promoted as a swinging game anyway).