Did he smell of golden shower?
Don't kid yourself. You aren't the first woman to let him drain his balls in their willing mouth. You probably got a little thrill from feeling sort of whorish for those few minutes and probably have masturbated to the memory more than once. I'll guess you're reasonably attractive and that the ride wasn't too long so he could take the hit to his income and play it off that you were a no show.
One set of specifics you didn't go into detail on in your brief telling of the tale. Did you let him go bare and cum in your mouth as I suggested above? Did you swallow for him and let him grope your tits and ass while you blew him? Would you consider doing it again for him? For another driver?
