My wife and her Aunt

I came early one day had finished early and I thought would surprise my wife 24. Well, I did, but I was the one surprised the most. I found her in bed with her aunt 39(single). They had been lovers for years and both bi-sexual. Her aunt recovered first and asked me to join them, I recovered and thought why not. So, I fucked my wife's aunt first, big mistake, not because it upset my wife. But none of us thought about take precautions, my wife and I were trying for our first. Had succeeded hadn't yet found out at that time, so I didn't use protection, her aunt more use to sleeping with my wife, didn't think of taking any precautions. Anyway, I really enjoyed myself fucking both and it was several days later as my wife was testing herself and getting a positive result. She rang her aunt to tell her the good news as I was already home with her. It was then it dawned on her aunt that she nor I had taken any precautions. But what are chances one fuck and my wife, and I had been trying for several months. Well, it was 100 this time around, her aunt decided to have the baby once she knew she was pregnant. Only change was she moved in with us and into our bed also. Both would've sons and my wife's aunt still living with us and sharing our bed 3 years later.