Sophie K "Festive Fuckery: P1"

You've invited your girlfriends sister over to have some Christmas celebrations with you, seeing as your girlfriend has gone out for the evening. But you find out Sophie's boyfriend has also gone on a night out at the same venue as your girlfriend?... Do you think the two of them have gone together and having an affair!? They must be! How about the two of you have a bit of festive fuckery and get a little revenge!