Lesbian Sex Slave

After seeing an ad for a medical study, Natali decides to sign up. She had been hoping to be cured of her orgasm problems. Gianna’s methods are very different. She ties her up, spreads her pussy wide with clamps, gags her and notices that gets her excited. She uses a butterfly vibrator to get her close, and calculates her orgasm quotient. Then nipple clamps are applied and pulled on to see the response to pain and the building excitement. Then Natali is tied in a hogtie with her arms tied bend over a pole for more vibrator tests.