I wasn't easy on her, and fucked her face pretty aggressively, but couldn't get Beth's admonition out of my mind. I looked around and saw that Jim was seated on the bed behind me, and Karen was hidden from my view. I had a pretty good idea what she was up to. I pulled my cock out of Robin's warm and willing mouth and helped her stand, then took her hand and guided her around the bed.

I sat beside Jim, and encouraged Robin to get back to work. It was fun to watch, the two sisters doing their best to satisfy us. After a minute or two it looked...