For a few quiet moments you sit, trembling. It's only a matter of time until you find out whether you'll live or die. Mercedes, meanwhile, has taken the opportunity to recline in a patch of grass next to the parking lot. She gives her tummy a pleasant rub, enjoying the sensation of the metal cage and its passenger being sloshed and squeezed in her stomach. Never before has she felt more satisfied by a meal.
Meanwhile, back on the inside, your head starts to spin as you feel the warm, acidic fluid pooling at your feet. It seems the car isn't as water-proof as you had hoped. A painful burn makes its way up your body, seeping through your clothes as you are gradually engulfed in the deadly liquid. You can feel as your skin starts to melt away from your body before your coffin finally fills to the top, trapping you beneath the acid's surface. You drown in it before you are melted to death, giving you a much less painful way out. The remains are reduced to a nutritious, delicious mush.
---
"Oh my god," Mercedes mutters to herself, huddling over a toilet, "this hurts so bad!"
She can feel the large, metallic object making its way through her lower colon. The vehicle she had devoured a few days before had finally made its way through her digestive track and is ready to make its exit. Its sharp, jagged edges scrap painful against her innards, but with a good amount of pushing, it pops of her rear and falls into the empty toilet bowl with a splash.
Turning around, Mercedes reaches into the bowl and retrieves her prize. She smiles as she examines it; a miniaturized school bus, its yellow coating nearly scorched off by the journey. Two days ago this bus had been filled with a squad of bimbo cheerleaders who had dared to insult her. Now they were gone; nothing but meat for her hungry tummy.
Trophy in hand, Mercedes walks back to her room and places it on a shelf next to the other mementos of her ravenous hunger. Joining the bus are countless cars, boats, and even an airplane, all remnants of the victims the teenager has sent to her stomach.
A year has passed since your death in Mercedes body. Soon after your disappearance, the bank held an estate sale on your property, the shrinking machine included. Mercedes, always getting what she wanted, begged her father to buy the cursed machine and before long she had it in her possession. Since then, she's been using it a great deal, chomping down on anyone she pleases.
Numerous souls have found their way into her toilet bowl and the results speak for themselves. Her breasts, only a moderate C-cup on the day of your death, have swollen to an ample pair of D's. Her rump, once average, is now quite plump and round. Finally, her tummy itself has grown, a nice belt of fat hugging to her midsection.
Mercedes doesn't mind, though. As unsightly as her chubbiness may be, it is nothing compared to the pleasure of devouring her enemies. And continue devouring she will, all thanks to a certain doctor and his stupid, stupid actions.