Guy walked back home, loving how big he'd become. People just stared at the muscular behemoth who strutted - or rather, waddled - down the street; they simply hadn't ever seen anything quite like it. Well, no one had: Guy was the biggest, strongest man ever, thanks to Mr. Yuan's magic ointment.
When Guy got back to his apartment, he realized that he could barely fit through the door anymore. He had to move through it sideways, and even so his pecs and butt were brushing against the frame. Guy got a little hard just thinking about how big he had become.
Mr. Yuan hadn't been lying. The ointment really had given him the body he wanted: impossibly big, and incredibly hot. Guy wondered briefly what would have happened if he had wanted to be even bigger. He simply couldn't imagine how he'd look if he had grown to 800 or 900 pounds instead of 'only' 600.
Guy had been lost in thought for a while, but now he suddenly noticed a strangely familiar feeling. He looked down at himself - and realized with a start that his muscles were, once gain, growing bigger.