When her slave drops the weight Mistress Isabella is about to suspend from his balls, even she has to smile and laugh. But her slave won't be laughing as his balls are pulled upwards by that weight as Mistress Isabella administers the impact part of the test. Isabella smacks his helplessly bound and stretched nuts again and again with her riding crop, enjoying the pain she is causing.
But that is not enough to satisfy this sadist; she demands that he keep thanking her for hitting his balls, and since thanking her means the slave wants even more, he is caught in a brutal loop of ballbusting. Only when Isabella has tired of smacking his poor nuts does she stop, but she is far from done - the crushing test is next on the list.
Length 7 minutes