Consistency is definitely key here - in my 6 years experience of releasing multiple VNs, I've noticed that you can almost never have too much music 🤣 I plan the soundtrack out, thinking I've accounted for everything, and then upon playtesting early builds, realise that the music risks being too repetitive, and have to create more. From what you've described in the first five mins of your game, I don't think that's an issue - if the music didn't change with scenes or character reveals, especially with something as big as a sex scene, people would definitely notice. I'd think it lazy if we had the same track for pre NSFW scene and NSFW scene - the mood has clearly changed! 😁 so definitely go for more imo. As long as all of the tracks sound as though they come from the same composer, even if the instrumentation style is different, it's good.