Mistress fucks slave's urethra with metal rod - BDSM sounding

Slave is bondaged to gyno chair and gas mask on his head. Truly cruel mistress injects a lube right in his pee hole using a syringe. Latex clad mistress shoved a long, ribbed metal shaft in slave's lubed urethra. Damn, now his poor dick looks like a fucking kabab on a skewer. This BDSM dick torture is called sounding. Soon mistress sounds that enslaved dick with a thicker metal rod. Mistress vacuum pumps that cock and leaves.