"3 minutes on the dot for a million yen game" is what it was called. We picked up some female students and had them participate in a game where they were restrained while we applied an electric massager to their crotch or inserted a vibrator, measuring three minutes. The first-time experience with restraint toys seemed a bit too stimulating... They writhed their hips and shook their legs, experiencing multiple intense orgasms and squirting.
