Oh, God! She's riding my dad's cock, but not just any old cock, an old, dirty teenage cock. Mom and I had been planning a threesome for the better part of two years, and now I had to wait almost a year before she finally went through with it. I wasn't too worried about her decision at first, I mean two years of anticipation and dreams of a threesome, but now I was sitting in the living room with my head between her legs while she grabbed the scolding pad on my dad's office desk and began to pull and slide the pad down across the floor. "Come on, Mom!" I hissed, suddenly remembering what a horrible day I had just had..