First I love my wife deeply, but our s** life is lacking like most other middle aged couples and for the last couple of months I have found my sister in law very attractive and I fantasize about her and I having NSA s**. She is very beautiful but she is single, just no luck with men. She has been focusing on her career for the last year and back living with her parents to get her finances In order. But my fantasy is getting her to move in with us, we are empty nesters and there is plenty of room, and just start to lightly flirt and just see where it goes. Of course in my “Alone Time” it goes all the way. I wonder how long this obsession will last and of course I will never act on it but wouldn’t rule it out if I found out she was into it.