I open up my pussy with a Collins speculum, insert a Foley catheter into my bladder, and inflate the retention balloon. At first, the balloon isn't quite big enough, and starts to slip out, showing off just how much I've stretched my urethra! Once I get it properly seated, I put the other end of the catheter in my open cunt, letting the piss flow into my pussy as soon as it starts to fill my bladder. Then I use a vibrator on my clit, and you'll see every spasm and contraction when I cum- and see how it makes more pee drip out of my cunt.