I've got a 20 inch silicone dildo in my ass, and my dick and balls are bound tight and estimmed. It took a little while to get there, but I turn up the power on my dick and balls and start pushing and pulling the dildo in and out. When the big bump goes in all the way to the hilt, my prostate starts twitching. With the estim power banging away at my dick and balls, my ass convulses and spits cum out of my cock.