As I worked up a good rhythm, Crystal doubled her efforts on Bianka's pussy. It pushed her over the edge soon, and while she was in the throes of cumming, I began to really fuck her ass hard. Crystal put her hands behind my ass, urging me to fuck her friend harder and faster. She also began to divert attention from Bianka's pussy to my balls and cock. It added a brilliant additional level of tension and desire to me. This was an unexpected and nasty threesome. I felt like indulging in the moment.

"You're so thick, baby," Bianka said. "Oh god. So thick."

I got a wicked idea and...