Luna wandering off in the city by herself has been planned from the start. I'd like to have a similar roaming system as she does in-game eventually.
Scene variance sounds good on paper but it's going to end up with people not even realizing the scene could have played out differently until the game has a lot more replayability. I'll flesh out those parts way later!
Of course that'd be an issue with scene variance, that's why I split it into three sections, since they'd have differeing degrees of difficulty and importance.
The wandering scenes, which have the same text and expressions regardless of Luna's corruption. These would be the most noticeable since changing the expression she has in the side art during those scenes would not only show she's starting to enjoy those acts, but also be possible to notice in a single playthrough.
The story scenes, such as the good arena ending potentially not having the kiss part. These would require multiple playthroughs to find, so aren't exactly what I'd call an important inclusion yet, since the story content itself seems like pretty early game stuff, though I don't know that for certain since I don't know how many areas you have planned, but I still feel it would add to things if stuff like that happened.
The addition of more intimate scenes between Anon and Luna, which I should have specified I didn't just mean ones associated with the story. Like imagine getting Luna a gift and her response being either "aww thanks" or "oh, uh thanks..." depending on if her corruption stats are too high, that sort of thing. This one would not just require writing one scene, but at least one variant of it.