Rachel wants to show Derek how to use the Hitachi vibrator. She ties herself down because she has such orgasms. She gives him step by step instructions on how to use the vibrator. What she didn't count on was that he would get the hang of it so quickly. After the first orgasm she tells him to stop. He briefly considers stopping but then decides to have some fun. He laughs as he gives her orgasm after orgasm. She thought that he would do what she told him to do but it backfired.