My Wife's Sexy Sister Sucked Me Off

My wife invited her sister and her husband over for a movie night. He had to work late, so it was just the three of us. When my wife went out to get some dinner for all of us, her sister admitted that she had always wanted to see my cock. I showed it to her and could not resist letting her put it in her mouth. Neither of us have ever cheated before and we hope nobody finds out.