Hello, I am Sally, this how my story starts. I have been in a relationship with a guy and now, his younger stepsister wants to break us apart so that I will be with her. This all started one night, after Steve, my boyfriend, had cum on me after sex. He had gone to the bathroom. While he was gone, his younger stepsister, Cindy, entered the room and licked Steve's cum off of me. It was when she straddled my face, that I not...