I found out my wife belonged to an incest family the night before our wedding. I was staying in a hotel since the wedding was to be in her home town. There was a knock at the door and I opened it to find my soon to be mother in law there. After she came in I asked her what she was doing there. She looked right at me and said she was there to fuck me. Seeing the shock on my face she told me to sit down. She said there was something that had to be revealed to me before the wedding to see if I still wanted to marry her daughter. I sat down and she explained that her daughter had tries to tell me about her family several times but never found a comfortable time to bring it up. I asked her what it was and she said that she came from a very loving family. Seeing that I still didn't get it she told me that they were all into having sex with their family members. I asked if that included her daughter. She confirmed that it did. She said that as we were speaking her daughter was at her house getting fucked by her dad and two brothers. She said it was actually a very special night because her youngest brother had recently turned 15 and was getting to fuck his sister for the first time instead of just the oral sex they had had before. I was so stunned by the images that wee flashing through my head at the time that I didn't even notice what was happening until my mind snapped back to attention and I looked up to see the person who looked like a slightly older version of my wife stepping out of her panties as she stood back up completely naked. She walked toward where I sat on the bed and straddled my legs and sat in my lap and asked me what I thought. Thinking what my wife was getting I figured what the hell. I pulled my mother in law to me and kissed her. While I was fucking her I was amazed how similar it was to fucking my soon to be wife. After the wedding I was driving the car away toward our honeymoon destination and we talked about what I had found out the night before. She had been really pleased that I still wanted to go through with the wedding. Then she mentioned that her dad had been a little hesitant to give her away. I asked what she meant and she said that while they were in the prep room at the church just before he was going to walk her down the isle he lifted up her dress and bent her over a chair to give her a last short fuck. In the years that followed the family holiday vacations were filled with sex. I continued doing my wife's mom, and I got to see my wife doing her mom, dad, and brothers. It is the sexiest thing ever.