A femdom mistress takes pleasure in the art of CBT, focusing her sadistic tendencies on her submissive's most sensitive area. She kicks off her high heels, preferring the direct, unyielding force of her bare feet against his balls. With each strike, he winces in pain, but she insists, pushing him to his limits. She grinds her heel into his sack, feeling it swell and tighten, before delivering another powerful kick, determined to make his balls pop under her expert guidance.