Ruisa, a married woman who has been accumulating desire and fat due to a lack of sex and exercise, decides to just try out the free trial at her home personal gym that she happens to pass by. Ruisa is soaked in sweat, and the trainer's big, muscular cock presses against her body, forcing her into an adulterous creampie sex session! He pounds her like crazy, with a cock that her husband doesn't have! His hard body twists and turns as he orgasms in succession! In a closed room with just the two of them, they engage in a juicy sex workout that burns more fat than muscle training! A female's genes can't resist the biologically dominant macho cock...!