The tension had been building for days. Too much was going on at home, so there wasn't going to be time to be with my wife anytime soon. I had to run some errands one afternoon, and thought about finding a quiet place, maybe a park on the river, to find some relief. Pulling into the car wash, I had an idea. If I pay extra for the double wash, there just might be enough time. There was one car ahead of me, so I began stroking my cock through my jeans, growing harder and warmer each second. The car wash door opened up, and I pulled in. As soon as the door closed behind me, I unzipped. But when my cold hands touched my skin, I went completely limp. I cranked up the heat and started stroking again. By this time, the wash was already rinsing the soap off my car. I stroked harder and was getting close. Then, the water stopped and the doors opened. I quickly lifted my underwear back up over my cock and started zipping up. The friction from the fabric pushed me over the edge, and as I pulled my car forward cum was pouring out of me, hot on my skin. Every move pushed my cock against my skin, causing me to cum harder and harder, soaking my underwear. The spasms slowly subsided as I pulled out onto the street.
I still had three more stops to make. I got to the grocery store, found the bathroom, and cleaned up as best as I could. I walked out, laughing to myself, about what had just happened, and that all the people in line around me had no idea.