Somehow, halfway through the scene I got confused. For some reason, when he asked me for a number, I thought he meant the number of more strokes/spankings/floggings that I wanted to take. So, I would say "7" to mean that I could probably only take 7 more lashes before reaching a limit.
The astute readers out there might realize that this is exactly the *opposite* number system from what was required. For example, when the action got real painful, I was saying "3"... meaning I was 3 paddlings away from screaming. Unfortunately, he was hearing "3 on a scale of 1 to 10"... meaning he was free and encouraged to amp up the intensity a lot more.
I'm still new to all this stuff - I still screw up a lot! But I'll keep practicing.