Putting his hands upon her breasts to squeeze and tease her nipples, the Master just kept on jackhammering her, sudden and without much warning and as hard as he could.  Yet he kept her reasonably still, not wanting her to stop her training lessons.  "Good girl," he told his loyal slave, planting a kiss upon the side of her neck as he pounded her.  "Now squeeze that pussy for me," he commanded.  "Milk me dry."