As the side characters get bigger, finding clothes will naturally become harder, so you'll get your wish for that.
Mia is canonically boob only, so I'll have to think about the AE serum. I hadn't planned that for her and will have to think more about what her character would want. It's not out of the question, but also wasn't originally in my plans.
I understand that's what the other devs do, but I'm not them. I have no plans on releasing Chapter 2 onward at this time as a free release. That said, I will be publicly releasing the game I'm working on now a month or so after it is released exclusively for Patrons.