Slavery: A series of erotic games (book 04)
"I want you to put yourself over my lap. The Enforcer is one of the instruments Master uses to punish us. I'm going to strike you with it once and once only, so you know what it feels like. Then, I want you to imagine it hitting you twenty-five or more times in a row. That's what could happen to you if you're disobedient. One of our friends is spanked fifty times every morning. Sometimes with only a hand, other times with something worse. Every morning. You will be hit once and you can make assumptions from there as to how bad fifty is. Get ready, over my knees, NOW."
I shouted the word, so she'd realize it was an order I expected to be obeyed. She was over my lap in two seconds, her delight