Reyna Avila Remiréz-Arellano, praetor of the Twelfth Legion, daughter of Bellona, goddess of war, and one of the mightiest demigods of the current age, had this dirty little secret that she had kept from the whole of Camp Jupiter, from Octavian, and from Jason.

It was a dirty little secret that was about to become much more literal.

The praetors got to have their own private barracks, a perk of their status, and it was only accessible by them, and of course, the gods, but they never came poking around. As such, this gave Reyna a great deal of privacy, especially since Frank, her co-praetor, had his own bed on the opposite side of the barracks. The idea behind the dwelling in the first place was that the praetors, boy and girl, were expected to work closely together.

Very closely.

However, since Frank was promised to Hazel, he didn't like the idea of sharing a bed with another girl. Reyna was fine with that, it gave her own private room that she had enjoyed for several months since Jason vanished, reappeared, and then left and then came back but decided to stay at Camp Half-Blood.

Today was a day Reyna had been looking forward to for weeks now: Frank and Hazel we're going on an all-day date, starting with breakfast, and lasting all the way to dinner, which gave Reyna the whole barracks to herself as this was the legion's day off from exercises.

Shutting her door and locking it for good measure, now totally alone, the mighty demigoddess stripped herself of toga, armor, t-shirt, jeans, bra, and panties, leaving herself completely bare aside from the stubble steadily growing back after her last shave. With excited hands and a quickly beating heart, she opened the middle drawer of her dresser, revealing underwear and pajamas, and waved her hand.

Despite once being an apprentice of Circe, the witch, Reyna's skill with magic was lacking, as she was a more combat-oriented girl. However, she was good enough to cast an illusion with the Mist.
The image of the teenage clothes shimmered and changed, and in place of thongs, bras, and gowns was Reyna's super secret fetish.

It stemmed from her broken childhood, and was bolstered by an encounter with a witch on Circe's island, one who practiced "Infantilist Magic." On the island, it was encouraged for the witches to practice their magic on each other, and Reyna had seen the witch curse others with poor bladder control, potty training relapse, bedwetting, thumb-sucking, a desire to drink from bottles and sippy cups, etc., and Reyna started fantasizing about being a child again, to be loved and cared for.

So, she tried to antagonize the witch so she could be cursed with some child-like ailment, but it turned out the witch was also well-versed in Mind Magic, unlike Reyna, and so she read the demigoddess' mind like an open book, and instead took Reyna under wing, indulging her desires and being a mother to the girl.

Hylla, Reyna's big sister, eventually found out, and much to Reyna's relief, supported her instead of condemning her.

Life had been grand for a few months, and then Percy Jackson and Annabeth Chase showed up and trashed the island by releasing Blackbeard's crew, who took Hylla and Reyna captive. That episode eventually ended, Hylla went her own way, and Reyna hers, finding the legion. She had to put her fetish to the side on account of establishing herself, and wasn't able to indulge for years, until the Giant War started and Juno took Jason, leaving Reyna all by herself in the private barracks.

As horrible as it might have sounded, she wasted no time in hitting up Amazon, spending half a night going through items and making a list of things that she ordered and had on her pillow the next day. Perks of your big sister being the Amazon Queen: free, next-day, discrete, magical delivery.

In the following months, with the mountain of stress that came with leading a paramilitary organization of half-divine teenagers in the face of mounting threats and dealing with a power-mad augur that insisted on complicating your life, Reyna had fervently indulged herself, effectively getting spoiled by all the private time she had with Jason's absence.

Now, she was by herself again, and nothing was stopping her from cutting loose and enjoying a day of play.

The illusion covering her underwear drawer dispelled, revealing six sets of matching Disney princess pajamas, all big enough for a girl Reyna's size, accompanied also by matching pacifiers, big enough for Reyna's mouth. However, most importantly, in the place of panties were pull-ups.

The multiple stacks were of the childish princess motif typical of Huggies, but they were all clearly much bigger than what was made for the toilet training toddlers. These pull-ups were thicker, wider, and taller, the sides stretchy enough to comfortably and snuggly fit around the big athletic butt of a girl Reyna's size and shape.

With a giddy grin, the praetor chose the Ariel pajamas, grabbing an Ariel pull-up as well. She opened the trainers, put one leg in, then the other, and pulled them into place.

Reyna let out a very uncharacteristic giggle and the feeling of her pull-up going into place. She popped the pacifier into her mouth, the shield a soft green, the button white with a soft purple sea shell on it. She grabbed the pajama shorts, the same soft green as the pacifier and covered in an alternating vertical pattern of white outlined sea shells, and put them on over her pull-up.
The training pants were so tall and thick that the waistband peeked over the shorts, and there was a noticeable bulge.

The matching shirt was white with shirt green sleeves, with a green neck. The front of the shirt was dyed with a cute, full-body picture of Ariel, in mermaid form, sitting cutely on a purple sea shell.

That was how all the pajamas were set up: the shorts and pacifier were the princess-in-question's main color, with the pattern on the shorts being the iconic item of the princess, the shirt being occupied by a large picture of said princess. All sets were clearly designed with a toddler girl in mind, but Reyna had connections, and it turns out there was a big market for this stuff.

Now dressed for the day in her Ariel pajamas and pull-up, Reyna grabbed her pegasus plushie and practically skipped over to her full-length mirror.

Now came the fun part.

Reyna turned around so she could see her back side in the reflection, bent her knees slightly…and pushed. She barely had to put any effort into messing herself, having been holding this load in for the past two days in preparation for this moment. 48 hours of accumulated waste instantly vacated Reyna's butthole, her pull-up and shorts easily expanding to hold the whole load.

As quick as it started it ended, and Reyna stood there basking in the feeling of the hot, firm poop that she just pushed into her pants. She reached back and felt it, her groin just a little bit warmer.

Naughtiness washed over Reyna.

She was the daughter of the war goddess. The praetor, one of the most powerful half-bloods of the age. She crossed the Atlantic by herself, fighting hordes of monsters on her pegasus, Scipio. She had killed the giant Orion, lead the legion into battle against two armies of monsters, and held the respect of hundreds of demigods. And here she was: a pacifier in her mouth, a pegasus plushie in her arms, wearing toddler-themed pajamas big enough for a teen, and a stinky pull-up on her butt.

"Ut-oh," Reyna giggled at her reflection. "I didn't make it to da potty. I went poo-poo in my pull-up. I's a naughty gewl…"

Now, she was going to play around until she decided to bathe and change, but her heart lurched into her throat when a female someone spoke behind her.

"You sure are."

Reyna whipped around, pacifier falling from her mouth as she went rigid in shock. The air shimmered, and Hazel and Frank became visible, teasing grins on their faces as they caught the mighty praetor standing there in her poopy pull-up…

To be continued?