Attach a timer-programmed vibrator to a girl's vagina, gradually increasing the time with intervals of 1 to 2 minutes for continuous vibration. 5 minutes…6 minutes…10 minutes…As the vibration time increases, the dangerous threat intensifies. Glasses beauty 'Riku,' usually a mid-orgasm lover 'Yuna'—two participants. The fixed camera also plays a major role in observing the girls' climactic scenes, whether they like it or not！！
