Tim, bound and blindfolded, awaits the expert touch of his dominant partner. The first contact of the cold metal sound against his urethral opening sends a jolt through his body. Biting his lip, he focuses on the strange yet exhilarating sensation as the sound is slowly inserted, his abdomen tightening with each inch. His partner's skilled hands manipulate the sound, applying pressure to his prostate, eliciting moans and pleas for more. The intensity builds as Tim's bladder is stimulated, the urge to void adding a layer of taboo excitement. Finally, with a cry of release, Tim's bladder empties, the warm fluid flowing out as the sound is removed, leaving him trembling and utterly satiated.