At her next order, he let out a pained hiss.  Biting his lip, he then let out a relaxed exhale and said, "Yes, ma'am."  It was torture.  She was trying to test him and he was not going to disappoint.  Still, the urge to reach out was strong, especially after being forbidden any movement.  Breathing in through his nose and out past his lips, he let out another strained moan when she rubbed against him.  When she nipped his ear, it took all his strength not to wrap his arms around her, fling her to the mattress and mount her.  Instead he just let out his frustration in a groan, the only outlet allowed to him.