Ntr is best told through a kinetic novel. If you have too much agency, you either turn it into netorase (having to choose the ntr option making in nts), completely fuck up the corruption pacing (games letting you "farm" corruption points to turn her into a slut) or it has uneven corruption points (different routes that you can do at the same time, so you finish a route where she does everything and then move to a different storyline where she starts shy again, although she already is a complete slut).
Trust me, kinetic novels are the best ntr you can get. People overrate "choice" for some reason, although usually its either just an illusion of choice or a choice of "do you want to play pure or do you want toget ntred, you cuck". Dude I am playing an ntr game, just fucking leave that option out.
Other than mirage defection, I cant think of almost any really good ntr that has choices. Its usually just choices to get a bit different routes of corruption, but thats just different branches of a kinetic novel. And even in mirage I think I would have preferred just a kinetic story.
Almost noone is capable of designing "natural" feeling systems like the corruption in karryns prison for example. Its so fucking hard I can only think of karryns prison that did natural non linear corruption really fucking well.