She told me it's because, when she wears stocks, her vagina "extends" into her dicks, so basically, all you had to do was tickle her foot and that's considered stroking her pussy... I found this pretty cool, even though nonsensical and went on with her idea.
lotsofpain
I call it "masturbating her legs" because it's basically rubbing and stroking her legs until she cums, and well, I consider her legs a pair of big fat dicks, which just plop around covered in black condoms... I found it strange that she cums if I do this for a while, and wondered how the heck were her legs connected to vaginal orgasms?