All names have been changed to protect the guilty.
It was the second Christmas they had spent together--Amy and Jack, Megan and Mark. They'd known each other for a little over a year now, and had become very close friends. On this particular Christmas, they would become even closer friends.
There had always been a sexual undertone in their conversations, but it had always been in a joking manner, usually nothing really serious. Oh sure, every once in a while, when they'd had too much to drink, they'd cop a feel of each other's significant other. Megan would run her hand up the length of Jack's cock through his pants, or Mark would grab Amy's ass, but it never went beyond that...until Christmas.
It had been a typical Christmas day with the Christmas dinner and opening of gifts, but once the children had gone to bed, the atmosphere took a different shape. The alcohol was tapped into, and the gag gifts were handed out.
Mark was a big collector of classic porno movies and had decided to give one to Jack as a gag gift. What hadn't been expected was the fact that Jack would want to watch it right away. He went straight to the VCR and slipped it in.