Either that, or where the subbie has already crossed the line (for example, saying that she wants to stay at the club when the Master says(for the 2nd or 3rd time), that it's time to go home, and in the Master's eyes, that little streak of rebelliousness needs to be tamed...
Meanwhile, the subbie realizes she's gone a bit too far, and understands why she needs to be punished, but isn't looking forward to it!