fuck piston


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 p-n-s 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 f-ck piston with my buddy.
we had to make sure she was lubed up good before we performed the ol’ f-ck piston.

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