It seems to me that she would want to at least play with his cock while he is getting her off. I know if I was that girl I would and, if I were that man I would kind of expect her to play with my cock if not more like suck or fuck.
I picture you moving to the woods a little way from the car. Completely naked riding one older man bare hard cock while sucking another's. Then a third start pissing on your chest and stomach. His warm fluids run down you as you enjoy two hard older cocks.