I have a couple of observations, not sure if they're intended or you plan to fix them.
First of all, every time you unlock a new girl, the price of new scenes for all the other girls also spike up, making it not worth to unlock more characters until you've exhausted all scenes of the existing ones. When you unlock new scenes for any character, all new scenes for all other characters also go up in price. I guess the code for calculating these things is simpler to make it work more smoothly, although it does look kind of weird for those of us used to clicker games.
And secondly, once you unlock a "next scene", the previous one gets replaced, obviously. But we don't have any way of going back, or see a gallery of all scenes unlocked, until all the scenes of the character are unlocked. It seems like a weird mechanic to not allow you to go back to things you already "bought" until you exhaust the "shelf".
Edit: I had to rephrase my observations, based on new knowledge
