I was on a road trip across the prairies by myself, going to visit friends. I had a lot of miles to drive and decided to go for as long as I could through the night without stopping and then sleep in my car.
I was getting drowsy, so at the next stop I peed and bought two energy drinks. In no time they were gone. The urge to pee was extreme, but I didn't want to stop for anything. I tried humping my hand, but it wasn't working. I jammed the empty drink can against my pussy and humped it to hold my pee in. It seemed to work better and I felt more in control.
After several minutes, desperation turned to pleasure and I found myself feeling horny. The humping, the vibrations of the car and the sounds of the highway were making my pussy wet. Driving was a lot more fun!
I maintained my pleasure-buzz without orgasm for almost two hours before I couldn't hold back any more and I creamed my panties while moaning behind the wheel! It was exhausting and I felt totally spent and soaked. My car smelt like sex and urine.
My bladder was sore and so I had to pull over and pee on the side of the road. It was another intense release to finally pee! It was so dark I could barely see the white glob my panties caught, but the rich, soaking mess in my panties had an intoxicating smell. I bought two more energy drinks at the next stop and did it all over again.