This is almost exactly what I need to do quite frequently during work hours also, shooting out a cum load like this out of my penis when it's driving me crazy. Usually it's in the car during a work-related pick-up or delivery of a package or papers. I get off the freeway, find a hopefully safe enough place to stop the car, get my pants and underwear down and just go at it right there. I ejaculate into a paper towel for easy clean-up, sometimes also slipping on a condom that has a good reservoir tip; very important.