When my mother found out that my dad was having an affair, they split up for several months. Mom was really upset about it, and the two of were pretty close, and mom and I fucked several times and really enjoyed doing that together. Then she and dad managed to work things out after about six months and they got back together. They are still together today, and dad has no idea of course that mom and I had sex, and it's just our secret that we both enjoy.