Double Hudini Smash

When in the act of having anal sex with your partner, you say you have to pull out for a second (to put on another condom or some other reason) then your friend switches in and starts having anal sex with her while you sneek around outside and wave at her through a window. then when she turns to look who is having sex with her your friend punches her in the face and at the same time you punch through the window.