Are you not making a fuck ton of extra work for yourself.
If I were giving every girl her own optional sizes, yes. It'd require literally hundreds of renders per scene. Absolutely dumb way to do it lol.
What I'll instead be doing is just 2-3 options that will affect all of the girls at once. So if you say yes to the option, all of the core girls (and potentially optional characters. TBD) will start growing. So it'll require 2-3-4 renders per scene depending on how many expansion events I go with.
In theory, this shouldn't be too much additional work, but I'll only offer it when I'm confident I can handle the increased load.
I believe that there are a couple of routes I can go about it potentially. No idea until I test it really.
Idea 1: Link the Size 1-2-3 to the Size 0 body in a way that when posing Size 0, Sizes 1-3 are moving with it simultaneously. All I'll have to do is hide 0, show 1, render, hide 1, show 2, render, etc.
Idea2: Failing Idea 1, I know I can set up shape presets. So I should be able to just render 0, load shape 1, render, load shape 2, render, etc. Which might even be more efficient than the first idea.
I've got a powerful enough rig that renders generally take between 3-15min depending on complexity, so realistically, the actual renders aren't what take so much time. It's all the dialogue, posing, and world design.