You've always desired your Mistress, She knows that you secretly fantasise about fucking Her... She's enjoys knowing that you want it but know you can never have it... She likes to rub it in your face, so She's going to humiliate you further and reinforce your position as Her lowly undeserving servant by allowing you to fuck the space between Her beautiful breasts instead, and laugh in your face as you sit thrusting away, wishing it was Her pussy...