when two guys double team a girl one doggy style and one in the mouth. The man doing the doggy style thrusts so the girl goes forward and sucks the penis of the other man. The momentum is then pushed back, creating a piston like effect, using Newton's laws of motion.
I gave her the old fuck piston with my buddy.
We had to make sure she was lubed up good before we performed the ol' fuck piston.
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