"Oh fuck!" she breathes. "Keep doing that!" I rub my thumb in a circular motion over her love button as I drive my hard shaft up into her fiery pussy. We are both bucking feverishly and I'm getting awfully close to shooting my load. I glance at the video screen and it looks like Susan is getting ready to climax, too. I want to cum with my sister but I don't want to leave Tracy hanging. I work my thumb faster on her clit and she goes crazy on my cock, rocking and bouncing like a wild woman.

"I'm cumming," she yells, "Oh fuck! I'm cumming!" I pull my hand...