Author's Note

This chapter contains diapers, piss and scat.

Horseapples

Celestia and Luna found themselves once again standing side by side in a mostly empty room. The walls were painted brightly, as the rat maze had not been, but most of the other rooms they'd visited had been colorful to the point of being garish, so that wasn't surprising.

The room was large, and it was scattered with oversized foal's toys. Luna and Celestia exchanged glances. They were foal-sized in comparison to the room, but both of them still looked normal. They also were once again unclothed. Somewhere in the transition Luna had lost the tattered rat costume, and Celestia the spandex wrestling costume she'd still been wearing, though bits of dried-on jello still caked both their coats and manes. Luna was also still bruised and aching from the pummeling the monstrous cat had given her, but she was largely unharmed.

They walked out into the room, looking around more, and eventually noticed a low bench or table against one wall that had their cutie marks painted on its white wooden side in bright, primary colors. The table was low enough that even though they were small compared to the room it was still low enough for them to see what sat on it. It had a pair of flatish pads, one in yellow to go with the color Celestia's cutie mark had been painted, one in bright blue for Luna's. Each side had a white, folded fabric object sitting on it. After a puzzled moment, Celestia recognized the pad as a baby's changing pad and the object on it as a diaper. She reached out a hoof and found her cutie mark on the diaper's butt, with "Princess Poopy Pants" written above it in an untidy scrawl.

"Lovely." That was Luna, who was looking at her matching diaper with disgust. It was big enough to fit her, which was hardly surprising, all things considered. Hers said "Princess Poopy Butt". "I suppose I shall be required to wear this... thing."

"Why yes, you shall!" Discord's disembodied voice sounded cruelly amused. Celestia could just picture his nasty smile. "Now put it on like a good little filly."

Luna snorted. "I was never a good little filly, even when I was a filly."

Celestia couldn't help but chuckle. That was definitely true. She regarded the diaper in front of her with another long-suffering sigh. "And I suppose yet again this is the only way for us to rescue our friends?"

"Such a bright little foal!" Discord's voice dripped with condescension. "Good girl! Yes! Now go on, put it on."

"Ugh," said Luna, and Celestia nodded her agreement. Celestia picked up the diaper. She cringed as she looked at it. But after all they'd gone through, what was one more humiliation, really? Fastening the diaper on herself was awkward, but she eventually managed to get it wrapped around her and the tabs that secured it fastened in place.

She looked over at Luna, who had managed to get her own diaper on as well. Luna shuffled her hooves, scuffing the floor uncertainly. "Now what?"

Luna shrugged. Then her eyes flew open in an expression of shock. Celestia would have asked what was wrong, but she suddenly felt a sensation that distracted her from any possible questions. She needed to poop. Very badly. She tried to hold it in, but the need was relentless. She clenched every muscle she had, her wings trembling with effort, but it was no use. A moment later she'd helplessly voided her bowels into the diaper.

Feeling horrified and ashamed, she looked over at Luna. The horror on her sister's face told her that the same thing had happened to her. The diapers must have had some enchantment on them that forced the wearer to fill them. Celestia felt her hindquarters wrapped in a wet, warm, mushy awfulness and shuddered.

A moment later she filled the front of the diaper as well, emptying her bladder, adding to the damp heat.

"Discord, if I ever get my hooves on you, you will heartily regret it," gritted Celestia through clenched teeth.

"He is a foul, horrid, disgusting creature," said Luna, her ears down flat. "But we must solve this vile excuse for a puzzle, I suppose, and get ourselves free." With a longsuffering sigh Luna added, "I hope there are not many more puzzles ahead, I am heartily sick of this."

"Indeed. Let's look around and see if we can figure out what to do." The pair set about searing the room, though every step was wet and uncomfortable with the dirty diapers wrapped around them. They found nothing that seemed useful. The scattered toys were just that, toys. There were no doors, and no furniture other than the changing table. Eventually they both ended up standing beside it.

With her face twisted in distaste, Celestia said, "I need to change my... diaper, ugh. Let's see if there's a clean one tucked away somewhere." But there was no sign of another diaper, and when Celestia went to remove the one she was wearing anyway, finally fed up with wearing it, she found that the tabs that had fastened it closed were gone, the diaper had fused into one single, solid piece, with no way to take it off.

"Buck," muttered Celestia. Luna scowled and tried to hook a hoof under her diaper's waistband and tear it off anyway, but she couldn't, it was tight to her body, and no amount of pawing at it with her hoof would budget it even an inch downward.

"Horseapples," said Luna, then flushed as she realized how literal that word was at the moment.

Just at the moment, both sisters felt another disturbance in their bowels.

"Oh no," said Celestia.

"Ugh," said Luna.

Then they both added a second load to their soiled diapers.

They searched the room again, more urgently this time, but still found nothing. Celestia sat down, tired and frustrated, and then immediately regretted it as the diaper and its disgusting contents squished around her hindquarters. "Gah."

"There has to be a solution. All the other puzzles have had one," said Luna, scowling.

"Knowing Discord, I wouldn't be so certain," said Celestia with a sigh. Then her eyes flew wide and she said, "Buck, not again," as once more her bowels began to rumble.

Some time later both princesses lay sprawled on their sides in the middle of the room. They had searched with increasing desperation, and had fought and struggled to somehow remove the diapers, but all their efforts had been in vain.

"I think my entire digestive tract is empty now," moaned Celestia miserably. The diaper around her was bulging, filled to the brim, and would probably have been leaking, but mercifully whatever enchantment kept it from being removed kept the edges stuck tight to her skin, so nothing leaked out. Still, she could feel it against her rump every time she moved.

"Ugh," was Luna's only reply. She was in the same situation, her diaper full to the point of near-explosion from repeated soiling.

They lay in exhausted, disgusted silence for a long time.

"I think I give up," said Celestia tiredly.

"Ugh," repeated Luna. There was a long pause. Then Luna suddenly sat up and screamed at the ceiling. "Are you happy, Discord? We can't solve it! I give up! There's no way out of your awful, terrible, vile maze, so we fail, you win!"