I start by putting a foley catheter in my stretched urethra- you'll see the pee gush out all over when it reaches my bladder. Then I use my big tunnel plug to hold my asshole wide open so that you can look right inside. With my ass feeling the stretch intensely, I use a vibrator on my clit and tilt my hips up so you can look at my rectum as I cum. Next I use the catheter to fill my gaping open ass with my own hot piss. I try not to spill while I make myself cum again, but that effort is doomed from the start, and pee gets just everywhere.