Back in the day when my wife and I had just got married, we stayed with her parents for a few months while we found a place to live. I was originally supposed to go into the Air Force, but they turned me down during the physical because of my fused spine.
Anyhow, we were living in the basement and her brother still lived at home also. Well one Friday night we came back to the house after a local party at a friends house. We were both fairly drunk and horny as hell. As soon as we got down the basement stairs, I started taking her clothes off and leading her to the sofa bed. She was totally stripped and I stood in front of her while she took my pants down. She pulled my tighty whities down and popped my cock into her mouth. She began sucking my cock like she was starving. We were both so into it we didn't hear the basement door open. I eventually heard the steps creek and as I looked around, there was her little brother (17 years old) watching his big sister swallow my cock balls deep. While she was blowing me, she had 2 or 3 fingers buried in her pussy. I just smiled at him and refocused on my wife with my cock in her mouth. I later found out he was watching for about 5 minutes before I noticed him.
My wife only noticed him as I began to cum and as she took my cock out of her mouth and yelled at her brother, I lost the urge to cum. Sure the alcohol didn't help either.
Over the years he has brought up the fact he saw his big sister in a pretty vulnerable position. She tells me that was her most regrettable experience ever.
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