Family Retreat: Karyn Stops By

"Hey, Jon," a girl's voice suddenly said, causing Biff to look up. "How did you get in here?" he asked her. "Uh, the same way I *always* get in here?" She sat down on the bed next to him. "So, are we gonna do it or what?" Biff looked her over and thought she was pretty hot, despite not wearing the best of clothes. Why was someone like Jon involved with someone like her? He put an arm around her and gently rubbed her breast. "Sure baby," Biff said, thinking Karyn wanted to have sex with him. Karyn laughed. "Quite playing around, Jon." Biff pulled away from her, confused. "Come on. Get the stone out. I want to use it." The stone? What the hell was she talking about?