"I don't mind being his show pony. I know I look good. I'm not shy about reeling in the benefits."
the partner in front (on all fours) is wearing a leash - or a belt on short notice. the partner in rear holds out a fist, and yanks the leash, causing his/her partner's head to slam into the fist.
the same results as the donkey punch are achieved, now with 50% more erotic asphyxiation.