All hail Mame, the ballbusting cartoon God.
This comes from a comic called Girls for M, which is like a collection of short stories drawn by popular hentai artist, all of them involving some kind of femdom. You may search it on ex-hentai or g-hentai and read all the 300+ pages, you could eventually find something intresting and ballbusting scenes are not so rare.
I feel somehow guilty for not paying such an awesome work, but i guess since i don't live in japan, this is the only way to enjoy it.

For all bb cartoon fans, trust me, you will really enjoy it:

http://depositfiles.com/files/7bqnhnnv0