This is a true story that happened about ten years ago. I had a girlfriend and we used to go to an empty relatives house to have fun. One evening I organised my friend to come exactly 8pm. So I persuaded my girlfriend to be blindfolded and started having fun. I teased her and got her going. Right at 8pm my friend slipped in very quietly. I continued teasing for a while. She was on her knees facing away from me. I signalled to my friend to strip off like I was. He took over from me while I made the sounds from near his head. She was kneeling forward while he took her doggy style. It was very exiting for us thinking that here was two of us having her without her knowing it. He finished and quietly slipped out again. Of course I was ready to go "again". She was delighted to get a double from "me". It was once in a lifetime situation but very exiting. Even now after many years I remember my wild night.