She touches herself in the car on the way to fuck another guy.

My wife and I have long had a fantasy that is to make a cuckold. I like to watch her fuck someone else, to be desired and touched and sucked until she cums. Finally today is the day and we are on the way with the car imagining how good we are going to have a good time. She gets horny and starts touching herself on the car seat while truckers pass by and watch her. She likes to be an exhibitionist and show her panties and tits.