I waited few seconds and then I stood up and walked to the piano board and made a piano down stroke melody..one of my male-buddies "Larry"was talking ...o Emily and I made a down stroke every time he spoke..just to shut him up..what I noticed and what shocked me REALLY was that she smiled when I did that not looking at me but I could tell that she smiled for what I'm doing..so I left the piano bench and walked to stop in front of Larry who was sitting by Emily..I asked larry to sit iin his place. For a long time he continued a conversation to the left, and I to the right, and although we were squeezed together we may as well have been parts of different groups. After a few minutes I felt his arm, which was sandwiched between my back and the sofa cushion behind, move inwards and downwards so that his hand was on my lower back. He gently rubbed up and down, just a tiny amount so as to be imperceptible to anyone else. After a short time he paused as if waiting for a reaction so I ever so. From the motion of her husband’s hips as he stood close behind her it was obvious what they were doing. Some muffled climax sounds were heard and the husband pulled out and turned to go in. Heidi straightened up, turned his way so he could see her whole front and kept turning to exit the balcony. In the dim light he couldn’t be sure but it seemed like she gave a little wave as she left.She’d made friends with him soon after he moved in so he knew she was sixty-five, married forever with two. There we were brother and sister sitting on a bed, Totally nude, With the door locked, Porn on the computer,Sounds of sex playing from the computer and Holding our underwear in our hands. We both tossed our underwear across the room. My sister swung her body positioning herself between my legs. She reach forward and looked me in the eyes as she grasped my cock. I stared into those dark beautiful brown eyes. I rolled my eyes back for a second and Moaned Yes. She just held me feeling the texture.