The moment the door opened was the moment that changed me forever. Cass was on the bed looking up at me with a shocked expression, while I was frozen....As I stood there dazed Cass started screaming at me 'GET THE FUCK OUT!'. I had never heard her use such language, I shook my head to clear it of the haze. When my vision cleared I followed the length of her arm down to her glistening pussy. My jaw nearly hit the floor and I'm sure a little bit of drool came out of my mouth. 'Wow' I breathed. She. Both of my heads were thinking at the same time, and the large one was having a hard time keeping up with the small one. “Beth”, I replied, “You’re my wife’s sister, you’re married and we are actually still family.” She looked at me with a disappointed face and replied, “You don’t find me attractive Jeff ?” My facial expression must have answered the question because she quickly followed up with, “Then, what’s the problem ?” I thought quickly for any answer I could find. “Beth, I just think it. "God, I love theway your boobs bounce..."Their destination was the Scottish National Gallery. She bought aguidebook and turned to the index, but she wouldn't let him know whatshe sought. Finally, she was satisfied."This way!" she led him through the maze of rooms, and stopped outsidea doorway."Trust me?" she asked."Not even a little bit," he replied with a grin. "Why?" Close your eyes."He did so. "Ah, yes... minimalist art appreciation. Why didn't I thinkof this?" Don't try and be funny," she. His boner was hard as stone. With her other hand, she took off her dress and impaled herself on him. As she was riding him like a wild beast, she put four fingers down his throat as if she wanted to control his breathing. At the same time, with her other hand, she was taking pleasure in pinching his nipples. They became red hot in no time. Under Nathasha's domination, he started to understand the meaning of the expression "Pleasure and pain". He knew now how she could be the master of his.