When this mistress needed to dominate this slave, she used her high heels to ball crush him. The mistress had to punish the guy and she did it as cruelly as she could. He never messed up again as the pain was out of this world and he could not afford to make another mistake and risk getting the same punishment or even a worse one. So he did what she wanted.
Mistress Zephy was angered to learn that her assistant had leaked her secrets to her competitors and while before fired him, she dominated him painfully to make sure he never did it wherever he would be employed again. She ballbusted him and let him marinate in the pain before she formally fired him and she chased him away from her office. He was told to wear his clothes on the way out.