Still horny from her earlier workout, Sybil Stallone takes her husband Scott Nails to the bedroom. But Sybil changes her mind and decides she needs a shower first, leaving Scott to jerk off in the meantime. Titular trainer Tiffany Watson returns to the house to pick up her bag, but she's lured to the bedroom by the sounds of Scott moaning. Tiffany, still horny herself, jumps Scott's dick and starts sucking him. When Sybil returns from her shower, she catches her trainer screwing her man and puts a stop to it. By this point though, all three of them are so ready to get fucked, they quickly talk each other into a steamy threesome.