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In a clinical setting, a stern mistress dispenses an unusual chastisement. She squeezes a generous amount of toothpaste onto her partner's erect cock, commanding him to masturbate until he cums. He hesitates, but she insists, watching with amusement as he tentatively grips his slick shaft. The toothpaste foams and drips, making his grip uncertain, his strokes halting. His face flushes with embarrassment and exertion as he nears orgasm, his body shuddering with the effort.