Sherry stared down at my pulsing erection and my sister's slightly spread, quivering little pucker. She licked her lips and nodded. Both girls groaned when Sherry's slick fingers slid into my sister's asshole that first time. I could practically read my sister's thoughts as I held her open. This was an extension of that fantasy for her. She was completely vulnerable, and now another woman was playing with her asshole while her brother watched!
I have to admit, it was hot as f**k for me to watch it too. Then I felt like a lightning bolt hit me when I had another "big picture" moment of realization. My sister had been just as obsessed with anal s*x as I had been! In fact, she'd probably been thinking about it a couple of years longer than me. The way her sexy body shuddered, and the way she
