I was actually going to include breast interactivity and inflation in the first build, but it got complicated really fast. I plan on adding that somewhere down the line.
oh Alright, I look forward to that, no rush since the more you time you take: the better you can make sure there's no issues when next update is released.
You could use the same mechanic with the belly and modify it a tad, you could also use it for butt inflation too.
Could make the fart volume louder or use different sounds. For wet (or often) farts. You should make her body sweat a bit because of how much she/he is doing.