Add the NPCs to the gallery so we can see all their stages of growth.
Allow optional rematches against Luna, even allowing her to get stronger (bigger) with each rematch.
And possibly a job system for your furries. Like if you have a furry not in your party, you can send them to a job related to the growth you selected for them (e.i. personal trainer for fmg or barmaid for breast expansion). This way they can passively gain EXP and money for you while you use your main furries in battle.