Here's a cute anthropomorph breast expansion comic from 'wolfjedisamuel' at deviantART. The context is that the comic is an advertisement for a product called "Biagra", which helps men achieve erections by causing their sexual partners' breasts to grow to enormous size.

A flat-chested wolf-girl in the comic wants to impress her date, takes the supplement and soon she's got tits grown so big she'll need a flatbed truck to get home!

Anyway, it worked for me. Click the thumbnail to see the full comic.