Eembarrassing! Caught while outdoors.

This is not how I imagined the whole thing. I had been sitting in the car all day. When I passed by a rest stop, I thought to myself, why not take the next step and pleasure myself outdoors? I thought I was alone and shamelessly played with myself and pleasured myself. However, I wasn't alone, and I was being watched. But since I was so aroused, it didn't bother me, and I invited the stranger to join me...