Glad to hear you like Shirley - she's also one of my favorites! Olivia was something I went back and forth with thinking whether I should include her or not, but enough people have been insisting she provides good variety so I'll keep her. You can of course feel free to skip her storyline stuff in the future :D
I agree Olivia provides variety - I'm just saying she's should look at least 6 years old. Her body doesn't necessarily have to change but her face should look at bit less pubescent. I know I'm not a patreon supporter or on a discord or anything, but I'm just trying to look out for you as a developer.
Shirley is a goddess and I would play this game solely for her.