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Alone in his room, an anonymous hentai enthusiast explores the extreme limits of self-pleasure, opting for a unique, taboo method - urethral masturbation. With a steely determination, he inserts a 50cm cable into his urethra, inch by inch, until it disappears into his bladder. His grunts of discomfort morph into moans of pleasure as he feels the sensation of fullness, the cable stimulating nerves never before touched. As the cable reaches its maximum depth, he withdraws it slowly, his cock throbbing and leaking pre-cum, leading to a explosive, prostate-driven orgasm.