While doing the girl doggie style
you have a friend waiting just outside the door. The said friend slowly comes in and you stop fucking her and he quickly procedes to take over. While your girl thinks you are still behind her leave the room and proced outside and to the window of the room where she is having fun. Then smile and wave to her from outside the room.
This magic trick will more than likely cause you to never get any from this girl again.
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