I know it's hard to find good belly button material, so I thought that I would point out a good video. It's one from Paradise called Tickle Buffet. It's at least a couple years old and I somehow overlooked it until recently. It has a girl named Gidget who is tickled by Renee. She tickles her belly button for a pretty good portion using her toung and fingers, and gets a great reaction. In my opinion, it's one of the best belly button scenes that I have come across.