Also depends on the girl and how well you hit it off. Myself I prefer single shot and then just go to another establishment if I want a second round. Usually don't like repetition.
Seems to be that 2 "cums" is the norm in most MPs. However, I usually change the "soapy" for a third round....everything is negotiable and.... ah! yep! everything may depend on how you treat your TG. Treat her well and expect same thing back....however, sometimes shit happens!