Finally! An update from Patreon! Not as bad as I thought it'd be.
Basically, I need to provide proof to them that Ashley is over 18 in the story's context.
It's a while since I played the game...
When they say "depicted in clothes [...] (school and cheerleading uniforms)" ... I wonder if they do mean in-game or just in your promotional material?
Because if it's only in-game... they're either playing - or at least have had a mooch around in the /images/ folder.
As you say, that's something you can probably fix with a clear (or clearer) introduction.
If it's purely your promotional images... then maybe it's just a case of changing the promotional images (and maybe doing something with an in-game introduction).
Regardless... good news and a step in the right direction.