My sister rolled off me on her belly. Her breathing was quick and shallow. As usual, she was having trouble catching her breath. I reached over and gently rubbed her ass while she struggled to come down.

Finally, we stood and went upstairs. We tiptoed past the room where my brother and his wife were. In my room, we took a quick shower together. It was a warm night, so we slept on top of the sheets in spoon fashion.

We awoke late the following day. Brenda tiptoed out of my bedroom, down the hall, and to the media room to shower. Even though Andy knew our secret, his wife,...