I was driving down the 405 one early Sunday morning. I was cruising along in my 4-Runner when I glanced down (I'm always on the look-out) at the car on my left, a Honda, and was treated to the site of a girl sucking her boyfriend driver. I watched as best as I could while still paying attention to the road ahead. The driver spotted me almost instantly - we made eye contact and he smiled at me with a look on his face like "yeah bro this is hot and I don't mind being watched". I doubt he realized I was fantasizing it was me doing him but hey...
Because of her body position I could not see his cock at first; just her head bobbing up and down. Then he touched her in a way that made her reposition slightly and he must have said something because she came off his cock and looked up at me with a lusty expression and her hand wrapped around his shaft. It was then I could see the dude was sporting a nice fat cock, probably about 8" long. That's unfortunately when I just had to force myself to pull away otherwise I would've potentially wiped out on the freeway.