alr I feel like if you would go about butt expansion you would have the milk production speed upgrade start to expand her butt if you buy enough upgrades. Though that is just me.
yeah nice point but wouldn't it make more sense if if became another part of the management aspect of the game. or maybe since the her butt gets bigger faster and faster maybe it could be like a different result like... (her cumming) or something and that becomes another ingredient in the coffee... sorry about being so inappropriate it's the only example I could think of