Not sure if this counts, but here it goes. My wife and I were staying at a friend's cottage one summer. He was single but there was two other couples (friends of ours) there that weekend as well. We were all in the living room sitting around having drinks after dinner. Later in the evening, people began heading to their rooms one by one. Until it was just myself and my buddy's wife. She started playing footsies with me then rubbing my cock with her foot.
After a bit she gets up, takes my hand and leads me to the screened in porch just off the kitchen. She drops to her knees, pulls down my shorts and starts giving me a BJ. After a minute or two, she stands up, turn around, pulls her shorts down, bends over the table and we fuck like rabbits for a few more minutes. Hoping nobody would wake up. When I was about to cum, she turned around, took my cock in her mouth and swallowed every drop.
It was a pretty crazy experience. She and her husband weren't exactly in a happy relationship and ended up getting divorced a couple years later. Which explains why she was so damn horny that night. My wife and I ended up having a threesome with her on another occasion before they split up. Crazy good times!