Kimmie hates when Step-Daddy bounces her on his knee when she has a dirty diaper. Of course, that's just what she tells him, so he'll do it more often. When Step-Daddy is at work, she gets creative and bounces on the big blue exercise ball while pretending it's Step-Daddy's knee. The feeling of the big load in her diaper squishing around is more than she can handle as she reaches orgasm several times.