Velvet Monkey Fist 

When a guy is butt fucking his girl while she is laying on her back. At this time he inserts his hand into the woman's vagina and wraps the thin membrane between the anal and vaginal canals around his cock. This enables him to jack himself off while fisting his mate at the same time.

Oscar loves giving Christina the Velvet Monkey Fist since he loves anal and she loves fisting.

Velvet Monkey Fist by Dadda February 14, 2008