"I'm already at the car's top speed! How much faster do ya want me to drive?!" Harley yelled back. She suddenly noticed a woman walking away from a vending machine up ahead. In her hand she held a small blue can. "SODA!" Harley yelled, her sweet tooth taking over. Reaching out her arm, she snatched the soda can out of the woman's hand and drove off. "'GWEMEB Cola for Women. Effects may vary.'" Harley read off the can. "Boy, these soda names are weirder all the time." She shrugged and drank the soda.
"Harley, drive faster!" Joker yelled. "Batman's gaining on us and you're drinking soda!"
"Keep your pants on! I'm drivin' as fast as I can!" Harley snapped. She pushed the accelerator down even farther than it already was, and surprisingly, the car sped away from the Batmobile.
About half an hour later, they arrived at their hideout. (I forget where it is, though.) "These chases are getting way too long," Joker groaned, getting out of the car. Harley got out of the car as well, but had an unusual amount of difficulty doing so. She also felt a strange tingling all over her body, mainly in her chest and stomach. Her costume felt incredibly tight, for some reason. Looking downward, she saw that she was getting fatter and fatter! Within minutes, she was easily ten times her original size and weight. Of course, most of the fat was going into her breasts. They got bigger and bigger, stretching her costume more and more tight. By the time the growth was done, her bust was the size of a hippo with a weight problem, and she was bigger than an elephant. She moaned with pleasure as she examined her hyper-voluptuous body.
Joker heard Harley moaning. "Harley," he said, beginning to turn around. "What are you do...ing...ho boy..." His voice trailed off as he gazed upon the mountain of flesh and fat Harley now was. Joker froze in place. That's when Harley's body decided to have one last growth spurt. Her stomach bulged forward and slammed into Joker with such force, he was thrown against the wall and knocked unconscious. "Oops," Harley said. She giggled and resumed her self-examination.