Mines was a bit funny because she was a hungarian with bad english.
In the 2nd round of sex, with only 5 minutes Over the 1 hr booking, I was on top and she said "FINISH".
So I pulled out, turned her around and finished on her bum, she turned around angry and said "When I say FINISH , I say time finish, not finish cum on me".
Ended up paying her an extra £20 as she was wound up. But I didnt care...