My wife and my sister were classmates in high school. Both are three years younger than me. I have never known them to be close and my wife has made it clear to me that she doesn't really like my sister. I found out recently that they had been friends back in middle school up until they were about 15.

My wife had told me in the past about how she used to have sex regularly with a girl back when she was that age. She told me every detail except the name of the girl. I clearly remember her describing how her friend like to lift her leg up so that my future wife could lick and suck her asshole while the girl masturbated then my wife would eat her out til she came then they would switch. A couple of times they fucked each other with a cucumber they snuck into my wife's bedroom during a sleep over.

Oh course everyone reading this knows that the girl my wife used to have sex with was my sister. Recently my sister was drunk and she asked me if my wife ever told me what they used to do. When I said no, my sister said, well you didn't hear it from me but no one's ever eaten my pussy better than her. And right then I knew why my wife wouldn't tell me who.

Great. Now I'm going to be creeped out at every family gathering.