Phew! That was a lot!!
The creameries and some side characters will grow in the following chapters. Keep in mind this is only Chapter 1 as a demo, the creameries and some side characters with some new side characters already are bigger in Chapter 2 and get moreso in Chapter 3 (to be released next year)! All side characters are viewable in the "weight room" with less clothes on - you should check that out too.
Mia going hourglass isn't out of the question - but she's a boob girl - and gets even bigger boobs in Chapter 2.
I considered adding extra outfits for the main character as an unlock and already have the code for that implemented, so that's a good idea, but I haven't implemented it yet! It's fully possible and I may add it in the future.
I haven't decided whether the main character will outgrow the creameries long term (for the ending) - but she does get really MILFy, then really pregnant again, so you have a lot more main character to look forward to even if she doesn't outgrow her research candidates.
Ideas and feedback are always good, thanks for taking the time to write all that! <3