D&D 5e Magia campaign.
 

Two hundred years ago, the gods declared total war on each other. They called to their followers, launching great crusades to strike against the light of the good and the dark of the evil.
Like a hundred wars before them, cities burned and thousands died, but it was just like any ordinary war. Then the event happened.
No one knows what happened. Perhaps the gods decided to finally fight each other directly. Perhaps a pact with a being from beyond caused it, or maybe a group of wizards wanted to end the war, and all the wars after, forever.
Regardless, in a single moment, the gods were slain, and much of the magic holding the world in order was no longer being shaped by anything. The magic forcing creatures to an alignment was also shattered. With many great seals of magic about to fail, a few powerful creatures, a Kraken, a Succubus, a Fey, a Silver dragon, an Angel and a Demon decided to use their power to create a sanctuary, the town of Haven. There, they gathered as many beings as they could stuff in a mountain and sealed the door. When the great seals of magic failed, most magic did as well, and many a creature fell ill as the magic in their blood faded. The Kraken, the only creature with magic from before the gods, spent all of its power to build a crystal that could store the magic that was sweeping through the world. This worked, and the crystal absorbed so much energy that the town never had to worry about running out it. The magic creatures of the world were safe. However, there were side effects. When the Dragon, Succubus, Demon, Fey and Angel reclaimed their power, the unstable nature of the magic caused their bladder and bowls to weaken, necessitating the use of "Protection."
These beings trained the new spellcasters, and the new quirk was passed on, along with additional variations from person to person.

Now, hundreds of years later, the outside world has become hospitable enough to send out an exploration team, and the members of that team wait in the council room as they debate if the risk is finaly low enough.
The members of the council were Randrunth, the silver dragon, Ilrun, the last of the demon queens, Rhelora, the succubus, Sayana, the last of the Fey queens, Anahita, the angel, and Lykra, the Kraken.

Shalyna looked to her two companions, periodically making sure that they didn't need changed. As far as Centaurs went, she was a runt, but she still towered over the other humanoids in the room. The diaper around her rump wasn't strictly necessary: she didn't use magic. But the magic that sustained her had weakened her control a little, and she felt no small measure of sympathy for the spell casters she cared for, so she wore and used them like they did. For the moment, she was clean.

As the council debated, a large crystal that adorned the wall suddenly glowed and split open, revealing the form of a humanoid. Randrunth caught the smaller being before she fell, and gently shook her awake.
(Everyone, introduce your characters and roll a d20 twice. Madness, your character wakes up held by dragon and two demons are on either side of her. Do with this what you will.)

Maribelle small little Elf girl who's appearance couldn't be more than 14 or 15, her hair is dirty blonde with somewhat of a greenish tint. She currently had on a brownish green dress and a small diaper around her waist.
Maribelle was raised primarily in the woods, while she knows of civilization it's still mostly a mystery to her. Her curious nature wouldn't let it stay that way for long though.
She takes pride in how grown up she believes she is, dispite this not being the case. Going as far to delcare herself an adult dispite only being 37, where as most would wait until around 100.
She's caring for all those she knows, especially animals. Dispite her sometimes being oblivious to someones true intentions, she's a good judge of character and has a Keen eye for telling who's a good person and who's not.

(Rolled a 16 and a 16)

(Rolled a 7 and 5)

Ishtar groaned, pushing herself to a sitting position in the dragon's claw. "Where am I? What-demons!?" She saw the dragon's silver scales, and assumed she was in good hands there, at least. She drew and ornate dagger from her belt, charge building in her hand.

For the others watching, the newly deposited humanoid had long, silver hair that was tied up in a ponytail. She wore a brilliant blue dress with ornate golden designs, and her eyes were a fierce, bright light blue. An array of jewelry decorated her, a necklace and several rings and bracelets. The dagger she carried was clearly something designed to channel arcane magic, and now pointed in the direction of the demon queen.

Mara stood between Shalyna and Ilrun. She was tall girl, with light complexion, intense baby blue eyes, and raven black hair in which she wore a bow of pink ribbon. She wore a black tunic, slightly ruffled at the sleeves in a little-girlish style, over which she wore a corselet of scale armor treated to give it an antiquated, almost blackened look. A rapier and dagger with matching hilts wrapped in black leather with silver thread were sheathed at her belt, and a mysterious crystal hung on a silver chain around her neck, its facets seeming to change colors, from pink, to purple, to blue, and back, depending on the lighting and angle of view. And, just barely visible, a thick pink disposable diaper peeked out from beneath her tunic.

Mara stood impassively, patiently, carrying herself like princess, awaiting the council's decision regarding the exploration team. From a young age, Mara had been trained in both traditional and darker arts by Ilrun, though as of late she'd been spending more time in the company of Shalyna, the centaur warrior whose ferocity was even greater than Mara's.

Of course, Mara had never been entirely out of diapers. She'd worn them at night all her life, and was becoming increasing dependent on them during the day as well as her power grew.

(Rolled 18 & 14)

"Calm down there, newcomer." Ilrun says calmly to Ishtar. "We aren't going to hurt you. You've been asleep a long time."

(Mara starts Messy and needs to make a control check. Ishtar needs to make a control check. Maribelle starts messy and wet, and Shalyna is fine. Do any of you have quirks or flaws that add to your bladder or bowl level? Also, I assume Mara has bedwetting? Lastly, just a bit of knowlage about elves, elves are fully mature at 18 like humans, other elves just don't consider them adults until around 100.)

(Yes, Mara is a bedwetter. Her quirk is Anger, which is triggered if she takes damage. Control check: 13-4=9. I hope that's a fail b/c I hate having a character with a diaper that's somehow messy but not wet, lol.)

(16-5=11 Control check)
Ishtar glared at the demoness, but a quick glance around showed no one else in fighting position, so she slowly lowered her dagger. "I've been...asleep?"

(Mara fails her control check and wets herself.)
Edit: (Ishtar also wets herself.)
"Yes, you've been in that crystal for last 200 years or so. To summarize, the world ended." Ilrun says.

---------- Post added at 05:22 PM ---------- Previous post was at 05:08 PM ----------

(Everyone besides Ishtar can talk to her if they want, or talk to each other about the situation.)

For the moment, Mara simply ignored her full, heavy diaper. She was hardly bothered by it anyway. She glanced curiously back and forth between Ilrun and Shalyna for a more detailed explanation of what's going on, and she tried to think of something constructive to say to the girl that had emerged from the crystal.

(History check: 15+3=18)

"The world ended? But you're here and-" Ishtar's words were cut off by a whimper, and she pressed her legs together, both hands immediately going to holding herself. It only took a moment, however, for all of her efforts to fail and a wet patch to begin forming on her dress where she held it pressed against her. Golden trails decorated her legs, and a puddle began forming on the dragon's hand that was holding her. She turned bright red, looking clearly shocked. "I...I guess I've been holding it for 200 years...I've never had to go that badly before."