One lucky fella was fucking my wife and her sister during the same period of time for a bit.
My wife is four years younger than her sister and would often go hang out with her and her older friends. One weekend, somebody’s parents were out of town, so the group threw a party. It was the typical college scene—beer, swimming pool, and lots of hanging out.
As in every friend group, there was one guy who stood out: the archetypal bushman. You know the type—reasonably attractive, funny, with an uncanny knack for getting laid in almost any situation. This particular guy was already sleeping with my sister-in-law, and he hooked up with her that Friday night.
The party continued through Saturday, and pretty much everyone crashed at the house that night. My wife and the Bushman ended up sleeping on opposite ends of the couch. Very early Sunday morning, they started hooking up. He ended up fucking her on the living room floor in front of the TV as the sun was coming up. She said he pounded the hell out of her—which she enjoyed—but she was shocked that nobody heard them.
They hooked up several more times over the next couple of months until she got a steady boyfriend. All the while, he was still regularly fucking her sister.
It took years for my wife and her sister to piece it all together. Her sister had a boyfriend the entire time, so she had to be very discreet. In fact, they were both married (my wife to her first husband) by the time they finally figured it out. They realized there was at least one occasion—and very likely more—when he had fucked them both within just a few hours of each other.
My brother-in-law still has no idea about any of this. I doubt he’d be anywhere near as aroused by the story as I am.