Here's the guy really responsible for that, and he actually has a few more like it:
http://ecchi.iwara.tv/users/mirakuma
Also, while the subject of that site is up, I thought I'd mention another user on there relevant to our interests. A lot of his videos are balloon fetish stuff, but there are several that involve breast expansion as well:
http://ecchi.iwara.tv/users/imbapovi