Slave R, a submissive exhibitionist, delights in pushing his sexual boundaries with cock sounding. He grips his circumcised dick, rubbing the tip against his peehole, teasing the sensitive flesh. With a deep breath, he inserts a well-lubed metal sound, inch by inch, feeling the pressure and pleasure build. His dick throbs as he twists and pulls the sound, exploring the limits of his urethra, before finally sliding it out, his cock glistening with lube.