Thank you, i'm glad you enjoy playing it ^.^
"differents shapes of breast" : i assume different size, like extra large ?. Not in plands, but i could try.
"other modification" : not really, feel free to suggest (altough the game might not be capable of handling many variations).
"height of the girl" : nope, requires lots of redoing. One option would be to scale her spine, but that looks very weird (talking from experience with SB T^T)
"the type of "interrior"" : should probably be possible, again, feel free to suggest (i don't recall many variations of 'interior', the current one is based on taimanin style graphics).
"wombfuck" : probably not. You can push it in very deep (pretty much crushing the womb) upon combining high lust + high edge + high arrousment + wide long thrusts.
"bulge on the stomack" : actually she already has the pregnancy stomac enlargement, it's not quite seen tho (try rotating the camera with 2 fingers or Right mouse button).
"mouthfuck, option to do bukake/facial" : sorry, no other poses. This requires much redoing. They might be available in some other BBC games (if i'll make more of these), like type of poses per game.