When I got married I told my wife I had an incest relation with my mother for some years, she didn't bother and even liked the ideia. One year after we got married we decided to rent a trailer and travel across France for the Summer. My wife asked me if we could invite my mother, it was a bit strange but I invited her. I found out later that they were already having sex the two of them and now they wanted me to join them and nothing better then to start a mother/wife threesome on vacations.