This happened to me last week. I won't say with who, but honestly, I felt ripped off. Her bottoms never even came off. DATY/O is a huge part of my fun, so when I find out well into the session, it's kinda hard to bail. It was an ok session otherwise, but I kinda feel like this should be disclosed on booking. In this case, it was a bit of a spontaneous trip, so I called, asked who was available, and chose from the three girls that were available.
She kinda joked about it, and said "I owe you".... implying she was aware that it was a less than "complete" session. She didn't hesitate to point out the upcharge for the CBJ. (With the dreaded promise of BBBJ "next time". Fuck that... there will never be a next time.
To any ladies reading this, holding back on a service with a promise of "Next time" is never a good strategy IMHO. It's basically an acknowledgement that you are not giving your best service and you know it. Imagine you're buying shoes. Dude sells you a pair that don't fit properly, but promises that when you come back, he'll get the right size for you. If you don't want to offer a service to someone, that's totally your choice and absolutely fine, but don't "withhold" as a form of extorting future business.