literature

Messing Contest Flame Princess vs Fionna

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Fionna the Human Girl, and Phoebe the Flame Princess were chosen by Princess Bubblegum to participate in a messing contest. For science, of course. The Princess merely wanted to test and see how a fire elemental's digestive system and diet of coal would fare against that of a human female of about the same age and body type, who ate a fairly ordinary human diet. The Princess took them both down to her lab, and had both girls stripped naked. They both had breasts of impressive size, Fionna having a pair of rosy pink nipples and Flame Princess's being dark red. Both girls were a bit squishy around the middle, Fionna being a little chubby, with a single jiggly fat roll, while Flame Princess had a round, potbelly to her. They looked at each other, and blushed, trying to look straight at the Princess, instead of their naked bodies. The Princess then fitted them with an identical diaper. Both of them were pink, and able to hold a nearly unlimited amount of mess. The diaper had a computer built-in, to allow the Princess to monitor the smell, consistency, volume, makeup, color, weight, size, and just about any other factor of the diaper and the smushy stuff inside of it, from a computer screen. In addition, they were both, of course, fireproof. 

The Princess handed Fionna a cup of water and a pill, and Flame Princess got an identical pill, except with a metal cup full of lava. Drinking water wouldn't exactly be healthy for the Flame Princess. "What's this?" Flame Princess said, looking down at it suspiciously. "It's a laxative, designed to make the whole process easier for you" she said. Fionna shrugged, having already taken the pill with a big drink of water. Flame Princess closed her eyes, swallowing the pill down with a sip of the lava. It went down just fine, and gave her a nice, pleasant tingling sensation in her belly, causing her to pat it with her hands, smiling. 

"Hey, this feels kinda nice" Fionna said. Fionna suddenly started laughing uncontrollably. "Hey, Flame Princess" she said. "What is it that you poop, exactly?"

Flame Princess blushed. "Well, I guess you're going to find out" she looked away. 

"Yeah, but it'll be hidden behind your diaper, so I won't be able to tell, donkus" she said with a laugh.

Flame Princess turned back towards her. "Well, it's..." 

"Oh!" Flame Princess suddenly shouted, as a small lumpy appeared in the back of her diaper, tenting out further and further, followed by a loud, bubbly fart, filling the room with the smell of burning. "Excuse me" FP said, blushing harder. 

"It's made out of a charcoal-like substance, but a big more mushy. It seems like it's always hot, too" PB said, looking at her computer screen.

Fionna reached her hand out, near the bulge in FP's diaper, pulling it away. "Yikes" she said. "It's like holding your hand up to a stove"

FP shyly groped at the back of her diaper. "It's so warm..." she whispered to herself. 

"When's my turn?" Fionna said, truly seeing this as a contest, wanting to prove that she had a more powerful poop than FP. She felt something building in her stomach, so she let it out all at once, starting with a big, ripping fart, and a big stinky load being fired out into her diaper, creating a large mushy shape all at once, noticeably bigger in size. "Yeah!" she said, wiggling her plump, messy butt in FP's direction. "Take that!" she said. 

FP blushed, hugging her still gurgling stomach. 

"What does your computer say about my poop, PBubs?" she said, squeezing more, her face turning red. 

PB tapped her chin with a pen. "Well, it's fairly normal, nice and solid, signifies a nice, healthy diet, of someone with an appetite that's a big above average"

"So I eat like a hero should?" she said, gripping at her tummy, feeling it rumble. 

"Something like that" PB said. 

"I think I feel something else coming on..." Flame Princess said, crouching down to accommodate her next load. Her diaper fell down in a pointed shape between her legs. The warmth could be felt all the way from where Fionna was standing, which was rather pleasant. Not that Fionna didn't have enough pleasant warmth of her own, as she filled her diaper for a second time, forming a nice, solid lump in the back of her diaper, as the front and bottom bulged a bit too. 

"Yeah!" she said. "I'm really good at this, right Princess?"

PB looked over at her. "Well, you're certainly above average in terms of a human, but FP's a bit impressive too" 

PB handed Fionna and FP a pair of laxatives each. "Take these" she said. "I'd like to see what your limits are, and measure your maximum amount of mess against each other"

Fionna had swallowed the pills before PB could finishing talking, and after PB was done, FP took hers. The reaction in Fionna was almost instant. Fionna felt a tiny explosion in her belly and ass, her diaper bursting out, falling to the ground and hitting the floor with a wet splat. "Oh wow" she said, leaning back, using her diaper like a seat. "Beat that!" she said to Flame Princess. Flame Princess gritted her teeth, her eyes turning red with anger. She snatched a handful of the laxatives from PB's desk. 

"That'll mess with my data!" she said.

"I don't care about your data" FP said. A noise like the rumbling of an active volcano came from her stomach. PB's computer screen flashed red. "You shouldn't have done that!" she said. "Fionna, please leave the room" she said. 

"But..." Fionna said. PB grabbed her by the arm, and pulled her outside the lab, her full diaper dragging along the ground. PB locked the door behind her. 

"Uh, guys, where are you going?" Flame Princess said. "Just wait until you mess, and then I'll take care of, well, cleanup"

In almost an instant, a huge load burst forth from Flame Princess, filling her diaper to unreal size, so much that the lumpy edges of her pink nappy pushed up against every wall in the lab. FP was surrounded on all sides by her own warm, smushy filth. She sighed, staying put, waiting for the Princess to arrive.

Outside the lab, Fionna gave the Princess a poke on the shoulder. "Hey PB, do you think if I took that many laxatives, I could poop that much! Or what about if I took even more? The Lich Queen couldn't stand up to that amount of stink, right?"

The Princess had her nose pinched shut. "No" she said. "After today, I'm throwing all of those laxatives away"

Later that day, PB had managed to clean up FP's mess, have Fionna's diaper changed, and get her lab back to its normal condition. She was in the process of throwing away the last of her laxatives, when...

She decided to take a single pill, feeling a small, warm bulge begin to build in her panties...
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diapergurl69's avatar
that was amazing like always