I once went to see a EE girl in Leeds, I could tell by the way she was on the phone and texting that she didnt like the job, and I would be made to feel like an inconvenience and rushed out asap, as soon as money handed over. Luckily, I actually sometimes prefer that instead of a girl pretending to be interested in my life, etc...
Anyway, I was right, but just as we started the action, I set my stopwatch going on my phone. I'd only booked for a 15 minutes session, and had made it clear beforehand that I wanted a blowjob without condom, nothing else for the full 15 minutes. After a few minutes, I got the inevitable "ok baby, 1 minute left, you cum now". I leaned over and grabbed my phone, and showed that the stopwatch only had 8 minutes on it, so I had another 7 to enjoy
She rolled her eyes, but did let out a little smirk, half saying "this fucking guy!", and half saying "ok, fair play to you", I smiled back at her and put my dick back in her mouth.
Ironically, had a nice little chat after the 15 minutes were up, for a few minutes, interesting girl.. The social dynamics of punting are fascinating at times.