I was driving on the highway today and took a break at a parking lot. There were no real toilets, but just two port-a-loos and one was out of order. A car was arriving and mother, father and their grown-up daughter got out. The father was using the port-a-loo and the blonde, good-looking daughter tried to open the other one which was locked. It was obvious that she was quite desperate. She crossed her legs and held her crotch with one hand from time to time and complained that she had to go badly. Once the father exited the open port-a-loo he probably told her not to use it because it was real