Trying to find specific male inflation story

hey all!  I recall this male inflation story from long ago and haven't been able to find it.  Perhaps someone here knows it.

It deals with a man who's car breaks down on a lonely road in the desert, and he walks to the nearest gas station to get help. He finds it seemingly deserted, but peeks in a crack in the garage door to see something astounding inside. There are two mechanics, big burly muscle men in coveralls, and they are performing service. Not on cars, but on these two jocks who are being held there. They are all tied up to the car service equipment, the elevated racks and such. The burly mechanics proceed to ask the giocks if they want oil, lube, or full service, and each jock pics a different one, afraid of what may be coming. The oil jock ends up getting a 55galllon drum of oil pumped into his ball sac, ballooning it to monstrous proportions, and the lube jock gets his whole belly blown up huge with water through a gas hose. In the end the mechanics end up finding our spying friend and catch him trying to escape. The close the story telling the man that he will be getting full service.