The E-Z Rider gives you total control is the perfect way to ride a cock while experiancing an unbeliavable solo session.
Alternativately, ride it while sucking off your partner. The uses are limited only by how dirty your mind is.
Some self assembly is required and the Vac-U-Lock can be fiddly, but once it's on, all you have to do is blow up the rubber ball and start to ride.
Let a little air out of the ball to control how bouncy you want it to be.