Mistress' Urethral Assault: Blocking Climax

A dominant mistress torments her submissive sister with a monstrous 50cm dildo, invading her tight anus and stretching it to its limits. She expertly performs urethral sounding, inserting a metal rod into her sister's urethra, drawing gasps of pleasure and pain. The mistress then denies her sister an orgasm, using a cum-blocking technique to prolong her torment.

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