"Yeah, I'm a genie," Ty said, enjoying this. "And you only get three wishes. You've already used one."
The calmer of the two extremely obese bodybuilders remained silent, but the crazy angry one babbled, "I wish I'd bulk up with muscle instead of fat!"
"Okay," Ty said, "from now on, everything you eat will get bulked on as muscle."
The obese former bodybuilder looked around and suddenly began drooling. "I'm starving!" he cried, but it was too far to waddle back to the buffet, so instead, he attacked the contents of the garbage can. Of course, people throw out a lot of food at buffets, and Ty and the other obese bodybuilder with the four hundred pounds of extra fat watched as the fatty pigged out on garbage, shoveling it in and swelling up with muscle under the fat until he'd inflated into a huge sumo wrestler, splitting straight out of his clothes.
At last he finished with the garbage can, then stood there swaying on his feet, looking at himself in horror. "What did you do to me?"
"Granted your wish," Ty said.
The sumo wrestler roared, but Ty just opened the back door of the restaurant and he saw the buffet inside. He squeezed himself through and began to gorge straight from the trough or at least the steam cart.
The door feel shut and Ty grinned at the other obese former bodybuilder. "You got a wish?"
"Uh," the sweating blob said carefully, "yes. I just wish you'd return me to my former bodyfat to muscle ratio and make it so my bodyfat percentage will never go above that."
"Okay," Ty said and then watched as the obese bodybuilder got thinner and thinner and taller and taller, the 400 pounds of fat redistributing as muscle, bone, and all the other body tissues as the bodybuilder turned into a 650 pound giant. "There," Ty said, "same ratio as before. And you can still bulk up your muscle. But if you'd ever gain any fat, it's going to go into size instead."
The giant stood there, his stomach beginning to rumble.
"Oh yeah," Ty added, "I left you the appetite. Better stick to lean cuts or you're going to supersize yourself even more."