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A strict mistress orders her slave to undergo a urethral sounding, a test of his devotion and endurance. She lubes up a stainless steel sound, its tip glinting menacingly, and begins to insert it into her slave's urethra. The slave, bound and helpless, grits his teeth as the sound pushes deeper, his cock swelling with a mixture of fear and arousal. The mistress, her eyes smoldering with dominance, continues to push the sound further, her fingers expertly manipulating the slave's body, bringing him to the brink of ecstasy and agony, all while maintaining complete control.