Hyper-Rubbing

I was doing an RP with a friend and he came up with an odd ability where you rub one's belly, making it grow. I thought this was so weird and outlandish that I HAD to draw it.

But dont worry... im never going to be the inflation fetishist you want me to be. ^^
By the way, the one on my tail is Green and the one straddling my chest is DragonKid, who made up this whole thing. So it's his copyrighted idea.