"AAAAHH! *SPLOOSH* " Harley fell into the vat of Chemical V. The Joker looked on with a sneering grin.
A few ripples continued, but no sign of his henchgirl.
"Harley..Hellooo!...Did you remember to wash behind your ears! HAHAHAHAHA-AH!!" after cackling, he was grabbed and pulled into the vat. Anyone standing outside the vat would have heard a splash, struggles, a brief scream, and a loud gulp.

Climbing up out of the vat, was Harley Quinn. She had to heave herslf up the ladder, thanks to the added weight from within her big, person sized belly, and once on the edge, she toppled out. Landing with a thud on the floor, her belly bobbed and jiggled, even more so with the added struggles.
"Oooh, Mr. J" Harley moaned. She couldn't say much right now, she was in a daze caused by the chemical. From the moment she fell into the vat, she became submerged in the experimental glop. Upon so, a strange sensation came over her. Her mind became completely void of all thoughts, except for one.
She was hungry!
Without a second thought, her ravenous stae caused her to grab and devour the Joker.

She moaned once again, now realizing the fullness of her tightly packed gut. Running her hands over the tightly packed belly flesh that tore clean hrough her costume. Still in her hazy state, she tried to get up, but her gut was just to heavy. Unable to move, Harley's body finally gave into exhaustion.
However, before her eyelids shut, Harley's tongue ran across her lips, while the struggles in her belly slowed, and loud gurgling came from within.