As soon as I stood up to go to my room and take a shower and go to bed I collapsed and the pain came flooding back. It took every thing I had to get o...f the kitchen floor and make it to the stairs where I had to stop and rest using the banister to hold me up. As I looked up the stairs, I saw Lisa coming out of the bathroom. I took a step up and that's when a new wave of pain came over me and took my consciousness with it.When I awoke later in my bed, I looked down to see Lisa washing the blood. She bobs her mouth up and down, forcing more down her throat, gagging. Im sitting there jerking off to my second orgasm, watching my wife gagging and deep throating this big cock. Just then the guy pulls her up, gets her on her knees, one hand on her hip and the other around the base of cock, as he rubs the head around the opening of her pussy. I have the perfect side view, I can see his big thick black cock disappearing between her legs and see her big titties hanging. She has both hands on. It was the best sex I had ever had in my life and it was with my sister. "Stop it," I told myself over and over, "I can not think about having sex with my sister. It was wrong and it was an accident." I heard my sister come into the room. She sat beside me and looked as hung over as I did. Her hair was all over the place and she had on a robe that was just barely tied. I was pretty sure she was naked under the robe but tried to push those thoughts away. Things had already gotten far enough out. But I was pleased to see she was beginning to trust me, that even if I had walked away, it was only for a moment. I hadn't walked away though, rather walking around her to stand directly in front of her. "Lower your hands and put them behind your back," I said. She followed my direction without hesitation."Now, whatever happens, you are not to move your hands until I tell you so, understand?" Yes, Master."And with that, I reached up and finally touched her hard aching nipple for the first time.