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Bound in intricate rope work, the sissy's body is a canvas of vulnerability and desire. He's clad in a frilly lace bra and panty set, his hard cock straining against the fabric. A urethral sound, designed to mimic a dog's knot, awaits. He lubes up and, with a deep breath, inserts the sound into his urethra, feeling the intense pressure as it stretches his sensitive tissue. He moans, riding the dildo, his bound body writhing in pleasure, as the knot massages his prostate, bringing him closer to a urethral orgasm.