Instruct her

You push the plump little bitch off your cock as her shudders diminish, and she kneels on the floor in submission, looking at you as though trying to anticipate your need.

"You're a complete whore now," you tell her, seeing her face blossom with degraded excitement. "You'll start getting texts on that phone, but you'll only take appointments on Wednesdays, Fridays and Saturdays. They might be in any of the five towns within an hours drive of here. Your whore name is Blossom."

"Blossom," she says excitedly, nodding her head and stroking herself. "Blossom the whore. I like that."

"Your rates are $200 for a blowjob, $400 for a fuck, and $500 to take it up your fat little ass. You don't negotiate. Understand that you fat whore? I know you'd give it away if you had the choice but you're working for me now and you better bring me the cash. Understand?"

"I understand," she says eagerly. "I can't wait! Why can't I start earlier than Wednesday?"

"Because I want you to stay exclusive. I'm in this for the whole year. I plan to sell your plump little cunt until school ends. You get the money up front, understand? You don't touch a cock until you have the cash."

"Yes, I understand. This makes me so horny! Are you going to fuck me again?" she whimpers excitedly.