Piston Fisting

A double fisting that incorporates both anal and vaginal penetration. Fists are then pumped in and out in manner similar to that of pistons in a engine.

I gave that filthy sow the piston fisting of her life.

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Piston Fisting

The art of shoving one whole fist in a girl's arse and the other in her vagina and ramming them in and out alternately (like a piston system)

I was piston fisting her til she blead

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