So you are in the midst of your workout and your step-sister passes by. You come to notice her watching you as you lift knowing she's getting more and more wet with each rep. Until she sits down in front of you and confesses to her soaking panties. You cant help yourself as you begin to throb at the thought and your pants grow smaller and smaller until she notices it. She starts teasing and playing making you pull it out and stroke it in front of her. Even joining in on the fun herself and stroking you to completion.