This is a two-part game. In first part, the girl has to maintain the guy's hard-on for as long as she can without letting him cum. She should bring him as close as possible to an orgasm without actually getting there. The challenge is to keep the guy hard for the longest time. Start a timer when the guy gets his first hard-on and measure how long the girl can keep him hard. If his dick softens - stop the clock. If he cums - stop the clock. In the second part, the total hard-on time becomes the girl's attention-time. The guy has to give the girl his full attention trying to please her during that time period. He isn't supposed to enjoy it. His job is to bring her to as many orgasms as he can during that time. The girl should be a passive participant - not making any efforts to please the guy. Unless the girl asks for it, the guy should not use his dick (this is her time, not his). Hands, tongues, fingers, feet, lotions, rubbing oils, vibrators and dildos and all ok.