Hey I'm looking for a story I read probably over 2 years ago. It was of this couple I believe boyfriend/girlfriend status and not married. The premise is of the boyfriend wearing a costume (I can't remember what the costume was but I want to say either Jason mask or a bear costume) and wants to prove that his girlfriend can't tell that it's not him with her during a the party when his three friends alternate wearing the costume. Everyone they alternate, she takes her 'boyfriend' upstairs and blows him. The real boyfriend is watching everything from another room on security cameras. At the end she reveals that she knew all along and blew them to teach him a lesson to not try and pull one over on her