Push her hand down your shorts.

You grab one of Doe's wrists and push her into your shorts right in front of your cock. The look on her face at first is one of shock and she hold her hand their motionless until you tell her to start rubbing you. She then relaxes and starts moving her hand against your cock inside your shorts. You unfasten your shorts and your stiffening cock springs free. Doe takes a step beack and looks at your cock with a curious expresion on her face.