I'll add a few...
EDIT: These are mostly Body Expansion, though.
http://criticalvolume.deviantart.com/ One of the best inflation artists I've ever seen!
http://fmsu.deviantart.com/ Sequences of anime girls inflating. Cute!
http://nin-man.deviantart.com/ Pregnancy-themes expansion. Sadly, the artist has vanished.
http://zmasta87.deviantart.com/ This guy does 'em round and cute.