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Challenge! Timer Vibrator Mei Kosaka

The Challenge! Timer Vibrator series by Taiyo Tosho under the Lighthouse label features Mei Kosaka in a restraint-themed scenario centered around humiliation, orgasm, and masturbation. A vibrator equipped with a timer function is secured inside the girl's underwear, delivering vibrations at intervals starting from one to two minutes, gradually increasing in duration. As the vibration periods grow longer—reaching five, six, even ten minutes—the intensity of pleasure builds relentlessly. The girls' bodies grow increasingly unable to endure the stimulation, inevitably climaxing against their will. Fixed cameras capture these peak moments in detail, creating realistic and intense scenes. This popular series captivates viewers by following the uninhibited, shameless expressions of Mei, a bold and lustful girl endlessly chasing unlimited pleasure.