An enjoyable game.
I wanted to ask and share some thoughts. Hopefully, that's alright.
Do you have any intention of adding any more cross-character scenes? Like the one with Alice 5 + Lisa 3. I would welcome such scenes, for several reasons.
For one, there are barely any interactions between them - you can focus your attention on just one and treat the others as non-existent.
Also, locking the progress of one girl until another one reaches a certain stage would allow you to create a canonic progression and write scenes that directly have the girls talking to each other about their changes (and have those conversations be accurate).
Since you have three measurable stats - weight, affection, addiction - you could even have slight alternatives to each scene based on those (for example, the winner of an eating contest would the the one with a higher addiction).