I've edged for a while and then had a full bladder. Gone into the shower with a full hard on. Been soooo horny that I feel like I have to cum and piss. I keep stroking and try to piss. Sometimes it dribbles piss out and down my dick. Then I start stroking faster and feel like I have to cum. So I stop, relax and piss some more and start stroking while I'm pissing. It's pretty hot! Sometimes rubbing my head and urethral opening helps me pee too...
I sometimes empty my bladder just a little bit and use the pee as lube, stroke and cum, then pee again with a hardon..