>>11328839
>official breast expansion through leveling in (what I assume) is not a porn game
Well there WAS Seven Pirates H which had "booby attributes" and "booby training" and - technically - wasn't a porn.
It was a kinda generic RPG outside of the funny leveling systems, I've kept it on my wishlist but I keep forgetting about it as it was only available on Vita and Switch.
Pic related is one of the enemies so you can kinda see what the game is about just from it.