Bulging, flapping exposed and pissing while walking

Bulging in my tight pants while I’m out walking I take my cock out and let it flap around for a bit, then I put my cock back in my pants and begin pissing myself, this is out in a public walk, the video stops abruptly because I got caught by a dog walker coming towards me, he looked in horror as my piss patch on my trousers darkened and spread