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In the privacy of his room, a curious man embarks on a journey of self-discovery and sexual exploration. With a collection of urethral sounds laid out before him, he begins his quest, starting with the smallest, 17mm. One by one, he inserts them, feeling the tight walls of his urethra stretch and yield. The pleasure is unlike any other, a unique blend of sensation that leaves him breathless. As he reaches for the largest sound, he feels a primal urge, his cock throbbing as he finally reaches his goal, his urethra stretched to its maximum, and he lets out a roar as he cums, marking his triumph.