My parents divorced when I was fifteen. One day during the summer I came home, and as I walked up to the house to go around to the back door, I went past the window to my mother bedroom. I could only stop and stare. There was my mother naked, with another woman, on the bed. The two of them were really going at it. I was so amazed. I had no idea that my mother was into stuff like that. I recognized the other woman, who was a good friend of my mother. Of course I didn't go in, but came back a couple of hours later. My mother just acted completely natural and so did I. I never told my mother that I knew her secret.