I have a provider friend of mine that asked me a question, and I don't know the answer. So I thought I would throw it our here. Situation was an incall. Client booked an hour appointment, the appointment ran over by a half an hour. Then the client asked for MSOG without offering to pay for additional time. My friend wants to know, what is the best way to handle this type of situation, and what does everyone think about it?
Some people will push and push umtil they are told NO. This guy is one of those. Your friend has to decide when she has reached her limit and point out their time together has come to end. Its that simple. It is possible the guy thought he was just so charming she was caught up in the moment and lost all track of time but I strongly doubt it. My guess is your friend is a very nice person who is a little unsure of just what the proper protocal is here. With this personality type, she must be firm and set the limits, or she will get used. Im sorry to be so blunt it bothers me when jerks take advantage of nice well meaning people. Best wishes to her and to you for trying to help out.
Tell it like it is... be straight out and direct...but always polite. 
I agree with Victoria. She should have politely told the gentleman when his time was up and offered to extend the session if he wanted (of course for an additional fee).
Hugs,
Kelli