While my wife was having our second child, her eighteen-year-old sister stayed with us to help out. When I got home from the hospital, she was in our bed wearing a flimsy see-through nightie. I liked what I saw, got undressed, and joined her. She liked what I had and we made love all night. That was four years ago and whenever she comes to visit, we find a way to have sex. It gets better every time we do it.