Your sister has come to visit, and to use your pool for the day, you're in your room and getting changed. You noticed how hot she looks, is that a new bikini? She asks you if you mind her getting changed in your room, but you don't mind at all. You're getting harder and harder for your sister, and she can tell. Her husband calls, and she reassures him she will be home soon, but not before your sister gives into her most taboo desires, riding her bothers cock.