"You can mmmfff the mmmfff, but can you walk the walk?" Image source: Jim Weathers' Bondage Cafe.
Well, this is a very nice and original take on the old meme of making a bound woman walk a line with a lot of lumpy knots tied in it pressing against her pussy. A succession of vibrators makes so much more sense, when you think about it. And what fun it is to think about it! Brings a whole new meaning to the term "baby knows now to walk the line!"
Bondage Cafe has a VERY tasty preview section, I highly recommend a visit.