Lingster from Growth Comics posted this sexy breast expansion sequence to deviantART the other day. I love the expressions he works into his work - not enough Poser take the time to make their figures express the appropriate joy/shock associated with rapidly expanding breasts.

In this sequence, the girl started out really flat. Soon she expressed skepticism, then shock, then delight, then utter glee as her breasts started growing and kept expanding until she wound up with the biggest tits in town. And they are big.