That's the main point, IMO, and as the author, I can absolutely guarantee you that, if the story ever becomes NTR, it will be optional, and based on explicit choices from the player.
I know that people have different views on NTR/NTS and that, for some, we've already moved past the NTS limit, but I disagree, as I feel that, as long as there's consent from both part, we're still in the NTS side of the barrier. Yes, even when humiliation is present, and yes, even if some things are kept hidden, as long as the other person consents to things being hidden because it makes things exciting.