I met my friend 10 years ago and we became best friends. Two years after we met I've started dating his sister and ended up marrying her. Once at a party my friend was flirting with a girl and my wife was watching him by far and commented with me that if he wasn't her brother she would fuck him. That thought never left my head ever again until the point I've made it happen. Look how satisfied my wife is with her brother deep fucking her.