Cybill Troy is a demanding and cruel Mistress who knows that a great motivator for training is pure pain. When the time comes to train her new boot slut to clean the dungeon filth from her 8-inch boots, she tied his balls up and straps them into a humbler, ensuring with an agonizing yank that his mouth will stay open nice and wide as she muffles his screams with a sharp boot heel to the back to the throat.