Mistress Eva has already punished the slave's balls today, but now she's turning attention to his thick meaty cock, which hasn't had any pain as yet. She makes the slave crouch over a chair, where she's got a work vice set up. His cock goes into the vice, and she starts to twist it - one sadistic turn at a time. The vice clamps tighter and tighter, until it's biting into his cock and the slave is groaning and fidgeting with agony.