Just outside Frankfurt: Erotika Voyage in Mainz worth the detour.
You get BBBJ as a matter of course, no questions asked, fine service and DFK as well, for €100 per hour. No entrance fee. So, if you know the provider then you get a great session for a great price. Got there and wanted one girl who looked great on the website, but she was new and said she wasn't into DFK. But another girl, just as attractive, but in the business for more years, was ready to go. The hour long session started very nicely. Lots of kissing and touching slowly more intense, then the BBBJ, then her on top followed by me on top and a climax. She knew how to create a fantasy right by not rushing. Allowing for, er, exploration during the initial kissing (my fingers in her right place) etc. So that by the time you climax you have this reinforced desire to do so that builds up. Anyway, high recommendation. I guess I got lucky with the lady.