Thank you for the detailed feedback! I'm glad you have enjoyed the game so far.
You bring up a good point with regards to the training system potentially becoming repetitive. While there are only two variants to the dialogue for each option so far, I would like to add new versions of existing poses that become unlocked as Valerie's sexual stats level up (i.e. fingerbang level 1, fingerbang level 2). I may also increase the amount of XP earned per action, so that players won't feel like they are continually grinding the same actions without change.
I'll double-check the female MC's boob size. It's possible that there were some small changes in between renders, in which case I'll be updating the next game version with new renders that are more consistent.
Further character customization (i.e. boob size or skin color) is certainly something that could be added to the game later on.