We'll do our best to not only incorperate the fetish preferences in the scenes but also in the story and dialogue too. But I'm confident we won't run into that problem as I don't see any plans of making 'sharing with another guy' a very prominent part of any storyline. If a scene ever happens, it'll probably be a one-off, casual thing that doesn't play a big part and when the player opts out of that, the dialogue will reflect it too.
I do want to stray on the safe side of debateable content whilst also providing things that are more niche. Hopefully we can find an agreeable balance. So yes, I agree with you in that the fetish does apply to not just the sex scenes but also the story and dialogue content.