He carries on

The alarm on his phone went off, but Dr Derriere carried on plowing Vina's pussy hard. The girl didn't even seem to register that the ten minutes was up, she was moaning and wriggling, biting her lip, enjoying herself. The doctor took his thumb out of her ass, licked it and put it back in, and felt himself building up to an almighty orgasm himself. He was almost knocking her off the chair he was fucking her so hard, and she was pusing back against his cock and thumb herself, and saying oh god, oh god.

He came deep inside her and felt her pussy pulses milking him from within. He stayed inside her for a couple of minutes, and played with her ass whilst she moaned softly, then he pulled out and walked in front of her and said 'lick me clean.' she looked surprised for a second, and then opened her mouth and licked his cock clean of all the sperm.

'I hope that demonstrates what I was talking about Vina,' the doctor said as the girl gingerly pulled up her leggings. 'Get your boyfriend to treat you like that, get him to fuck you in the ass, submit yourself, and you will feel the benefit. Any problems come back and see me, but if you do, please dress appropriately - you are not remotely slutty enough.'