In this CBT session, Electra Pure Divine and I take a thorough look at the slave's testicles, having prepared a selection of different nails, which we drive one by one into his scrotum. While we fixate the nails in his flesh with a hammer, he must jerk his cock and transform the pain into sexual arousal. Soon, his scrotum looks like a small metal prison and the skin is under extreme tension. Next, we use a vibrator that makes not only his cock vibrate, but also the freshly hammered nails. We want him to cum, while he is experiencing a maximum of agony, to firmly link pain & pleasure in his head. His relief however is short-lived. Immediately after his cumshot, we drive another nail into the sensitive skin and then begin to pull all the nails out again with pliers, while the remaining sperm flows over the metal and his scrotum.