"To get big?" Madame Illusia smiled at the young man. "Is that all? Do you wish to be taller? Sronger? Heavier?"
The boy flushed. "Well, I'd like to be bigger and stronger than any man here. Than any man in the world!" Then he looked down. "But I don' have any money. Just a few dollars."
"That may not be a problem. Would you be willing to work off your debt? Use your new strength and size in my service? I will provide shelter and food, and promise that you will find the work no real effort, with fringe benefits that should prove quite enjoyable."
His face lit up. "Yes! Oh, yes! I agree! I will be glad to work off the debt, whatever it is!"
Madame Illusia nodded. "Then I will perform a grand transformation for you." She concentrated a moment, and then wove a complex pattern in the air with her hands. "I give you all you desire, and more."
The boy gasped as his clothing suddnely disintegrated, leaving him naked on stage. The audience laughed to see his rather unimpressive crotch, but the laughter stilled as dark hair began to spread over the boy's skin. His sexual equipment was growing thick and long, with swelling testicles.