Know thyself, and watch the clock

“Sheeee-ooo! Twenty-four. Thank you sir.”

“Good girl. Now turn over. Onto your back.”

“Just let me…  Ahhh. God, my ass is so sore.”

“So it should be. Now. Legs apart. You’ve got ten minutes to make yourself come. Okay?”

“Yes sir.”

“If you haven’t come in ten minutes, I’ll give you another two dozen. Go!”

“Nnnnnnnn. Nnnnnnnn.”

But it was the time limit that did it. Without it she’d have come, screaming and flailing, within a couple of minutes. But having to come while he watched, with the clock ticking? She always, always, got the extra strokes.