OP would sit in a chair naked with his schoolboy shaved cock hanging out in front of your girl while I fuck her doggy style and don't allow her to touch you. Make you watch as she becomes enthralled with my cock, she begs for it more and more. Then as I've had my fill of every inch of her body I'd shoot some cum in her pussy then shoot some in her mouth for her to swallow, some on her face and the rest in her mouth. With the cum still in her mouth I'd make her suck your schoolboy cock
