Not good enough

Mia went down on Frank's cock. He grabbed her head and enjoyed the feel of her soft, silky hair as he rammed his cock as far as he could into her mouth and throat. "Yes, you love sucking cock. There is nothing that gives you more pleasure than being on your knees with a cock in your mouth."

"Mmmmmm," moaned Mia.

Frank fucked Mia's mouth for several minutes before he came into her mouth. When he was finished he pulled out.

"That was terrible," he said.

Mia licked her lips and looked up. "It was?" she said with a pout.

"Yes, you must be the worst cock-sucker in the city. You really, really need practice."

"I'm so sorry!"

"I want you to spend the rest of the day watching blow job porn videos. At five o'clock, you will go to the state college and find a fraternity. You will do whatever it takes to suck off as many members of the frat as you can. Have half of the cum in your mouth and half cum on your face and head. You always orgasm when a guy cums in your mouth or on you."

"Yes, I need to practice," said Mia, still crestfallen.

"I want you to take photos of yourself with every dick you suck in your mouth. At the end of the night, take a selfie and send it to me. Understand?"

"Yes, Master."

"Good, tomorrow come to work in your shortest tightest skirt, highest heels, and lowest cut blouse. It's time you started dressing like a professional, not a frumpy, 19th century librarian."

"Yes, Master."

"Good, now about my fee. I think you should pay me $500 an hour. Have my money tomorrow."

"Yes, Master."

"Good," said Frank.