It's odd but I think NTS has become too broad a concept for the possibilities within willing sharing. I can't see the MC of Deliverance as a cuckold, although he definitely enjoys seeing his Kat being fucked by other guys. Conceptually, he is a cuckold, even fucks Kat at one point after she allowed another guy to cum in her (sloppy seconds) but the story is written in a way that there is zero submissiveness in his attitude, anywhere throughout the game, zero humiliation fetish, zero femdom fetish. And it still works well with no great effort required into the proverbial "suspension of disbelief" that makes fiction work.
Not saying this story should follow the same pattern, since it's already set up for the FMC to be the corruptor instead of the other way around, but I'm hoping for at least a path where you can avoid any and all traces of humiliation, explicit or implied, as I don't have that fetish.