As Christina sat on Dr Darke's dick, unable to do anything else until he instructed her, she realised he was now struggling to control his urges. His voice was trembling a little with anticipation as he spoke.
"I want you to move your body up until I tell you to stop, Christina. Can you do that for me?"
"Yes Master"
Christina lifted herself up until her pussy reached the head of the doctor's dick.
"Stop!"
She held herself firmly in that position, using the arms of Dr Darke's chair to steady herself. The doctor looked into her eye's and smiled.
"Good, now go down again!"
Christina pushed herself back down until the doctor's dick was deep inside her.
"Good girl, now keep repeating that motion until I tell you to stop."
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