Keep It Down

Lucy is conducting research and offers her male subject the chance to win cash if he can control his penis. His first task is to strip naked and remain flaccid for 5 minutes. He thinks its easy but once his cock is out Lucy stares at it intensely and licks her lips and he is soon sporting a huge boner! She offers him double or quits if he can stop from cumming for 5 minutes but as he jerks off she talks dirty and opens her legs and he loses control again! "Your cock is mine" she laughs.