Perform Tricks for Karen and Kate
Kate: "OK, Doggy, it's the big finale. You've done very well to get this far and Miss Karen and I have been *very* impressed by your performance. You must be desperate to come by now and I can promise you that you *will* experience an orgasm very soon, but there's just one last thing that you must do."
Karen: "That's right, Doggy, it's begging time!"
Kate: "First, get yourself a nice big handful of lube. Next, bring yourself right to the edge as quickly as you can. Fast and furious, Doggy, fast and furious. Finally, hold yourself on the edge *without* coming and beg Miss Karen and I to let you come. Say 'Please Miss Kate and Miss Karen, may I be allowed to come'. Ask us ten times while continuing to stroke on the edge and when you're done, continue to receive our response."