You are Whitney's trainer at the gym and she has noticed how you have been staring at her belly and belly button when it's exposed, constantly throughout her workout. Whitney is alone with you and confronts you, she has a deal to make you. Whitney will let you jerk off to her belly and belly button now after her work out while no one is around; but you have to do something for her. Whitney wants her workouts and sessions with you to be free from now on. Once you agree Whitney tells you to take out your cock as she pulls down her yoga pants exposing her full belly. Whitney belly plays and encourages you to stroke to her tummy with dirty talk and jerk off instructions. Soon you will be cumming hard and filling up Whitney's bellybutton and when you do, her workout will be free with you forever.