Heavy workload (Star vs. The Forces of Evil)
Star hated being a princess. All the responsibilities, the lack of freedom, the royal duties that would one day await her in the future as queen... She hated it all.
And today, she hated it just a bit more.
Because her mom was gone, attending some important matter on the other side of Mewni, leaving the princess with just her father. And her father was... not the most responsible king, to say it kindly.
Don't get her wrong, she loved him nonetheless, but he could be quite of an oaf sometimes.
So, when the king had to hold an important ceremony in town, of course his daughter helped him. Partly because that was what was expected of her, partly so that he couldn't embarrass himself.
Though Star also had to plan ahead, on how she could avoid any public embarrassment on her part. Because this was going to be a long day, stuck outside, the entire town bustling with villagers and tourists.
It was safe to assume that there wouldn't be many bathrooms available and even less opportunities for her to just slip away, from the crowd of people demanding her attention, and use one. And since her bladder didn't care about opportunities one way or the other, Star would need to find an alternative solution.
So, she repeated an old trick, that she had discovered months ago on accident, while stuck in an hour-long meeting and with a bursting bladder.
She just conjured up a diaper with her magic, hidden away underneath her royal dress.
And not just any diaper. No, an extra durable one, that would be sure to withstand all the heavy workload looming before her. One that wouldn't leak. Wouldn't crinkle. Wouldn't let any sound from inside escape.
A perfect secret and a perfect toilet.
At least it would be one less stress factor off of Star's mind, while she navigated all of those royal duties.
And, sure enough, when the day started and Star found herself stuck in conversations and duties for hours on end, she didn't find an easy opportunity to visit the bathroom.
Good thing she thought ahead.
Since this wasn't her first time secretly going into a diaper, in front of other people no less, Star had no issues now to easily relax her muscles; to just put on a convincing poker face, stand still in one place for a minute and let nature take its course, while the thick padding between her legs absorbed all that warm, heavenly relief.
No one was any wiser to her actions. And - just like she had wished it with her magic - the diaper held strong throughout it all. Even with the entire weight of her heavy bladder weighing down on the padding, it didn't show on the outside. It didn't sag, or become loose. It perfectly absorbed every single drop.
Perfect.
With a sly smile on her face, Star continued her duties for the day.
And when nighttime finally arrived, many exhausting hours later, the princess just fell straight into bed, ready to let herself be carried away into unconsciousness. She didn't bother turning off the lights in her room. Or changing into her pajamas.
And she sure as hell didn't bother getting up and using the toilet, instead opting to go into her diaper a second time and reheating the damp material with a self-indulgent smile.
It was fine. It would hold out for one more night, for sure.
It was fine.
...It was not fine.
Star really needed to put damn clauses for everything in her spells, or something! Because, while the diaper sure was working as intended, withstanding all the abuse her bladder was putting it through, it did refuse to do one thing. One simple thing, that Star had forgotten to mention, while casting her spell.
Come off.
The princess had tried for a full ten minutes to rip that damn thing off, all while squirming in front of the toilet, longingly staring at the empty bowl of water that was teasing her with relief... before ultimately giving up with a sigh and just pissing right where she stood.
The relief was sweet just the same, her crotch being bathed in pleasant warmth, though it was also tinged with heavy shame and a crimson flush around her cheeks. It was one thing to use an emergency diaper when there was no bathroom available, or when her bladder didn't have the strength to hold out... it was another entirely to deliberately use one, while a perfectly useable toilet was standing right in front of her.
It felt... wrong. Shameful. Weak. Naughty.
Relieving.
Star both loved and hated it.
Though her feelings didn't matter in this case. After all, as she was realizing with a hot wave of shame, she was stuck now like this, her diaper the only bathroom option for the foreseeable future.
An entire weekend, at least. That was how long her mom was going to be gone, unable to help her daughter. Star groaned.
Well, at least the diaper still held tight onto her hips, no leaking anywhere. Though, as the princess realized with a foreboding sense of worry, while touching the padding, it did start to feel quite... heavy. Squishy. Swollen, even. She supposed it was only natural. Magical diaper or not, her pee had to go somewhere and if it was all trapped in there, then it made sense for the padding to swell up.
An entire weekend. Star swallowed down her nerves. How many liters of water would she expel throughout those days? How bad would the swelling get? Would people start to ask questions, when she stayed away from the bathrooms for too long? How was she going to hide her diaper?
The worry alone was almost too much for her. Though there was nothing to be done about it. Duty called, after all, and Star had a lot of tasks that she had to attend to, diaper or not. Better to get right to it. If she postponed it too much, or acted too nervous around everyone, people would only start to get suspicious and pay more attention to her. Then they would really notice her embarrassing problem.
And so, the reluctant and embarrassed princess started her long, long weekend...
An entire weekend of having to pretend.
To helplessly wet the same piece of padding, over and over again, her overactive bladder completely unsympathetic to her own wishes.
To witness said padding swell up more and more with each new use, the diaper beginning to strain heavily under its own weight and the inside feeling near constantly warm and moist.
An entire weekend of being forced to wear wide and frilly dresses, so unlike her usual style, just to hide the massively swollen shame wrapped around her butt.
She couldn't wait for her mom to come back. By now, the diaper had become so thick that walking was becoming a hassle, her legs starting to run out of space to freely navigate.
Any longer and she wouldn't be able to hide the truth anymore, on what was going on with her.
When her mom finally did come back - around the same time that Star was starting to feel claustrophobic, the massive diaper now constantly pressing down on her lower body and into her bladder, only making her wet herself even more frequent as a result - Star could've kissed her.
She did, actually, immediately kissing queen Moon on the cheek, the very first time she spotted her. Moon seemed perplexed by this uncharacteristic and overly affectionate gesture, but before she could ask her daughter about it, Star had already moved her lips from her mother's cheek, over to her mother's ear. She whispered, fast, hushed, like she was sharing a grave secret.
"Mom, you have to help me. I did something really stupid, again."
Thankfully, Moon didn't chew her out. And Star felt so free again, so unburdened, as she now stood in the royal garden and watched the other people of the palace go around and do their business. It was a mindless activity, just watching and not having to worry about royal duties, or having to hide a shameful secret underneath her dress. There was no thinking involved at all.
So, when Star felt the all too familiar pressure build up in her bladder, demanding to be released, the princess did just that. With zero thinking involved, she just slightly widened her stance and allowed her pee to flow out, to pool in her crotch, to seep right through her panties and splatter noisily down onto the ground, while also running down both her legs. She sighed in contentment.
All in all, today was a terrible day to wear her short skirt again.
It was also a terrible day to let her brain run on autopilot, to completely forget that she wasn't wearing her diaper anymore.
People stopped what they were doing, blinking and staring at the princess in clear astonishment. And Star finally realized her mistake, though by then there was nothing left to be done. Her pee had already collected itself into an impressive puddle at her feet, her bladder visibly expelling its last few spurts. She flushed a bright crimson.
Without a doubt, this accident of hers was going to become the number one topic of conversation among the entire palace today, if not all of Mewni. And Star's original plan, to avoid an embarrassing accident in front of everyone by wearing a diaper, was now all for nothing. All those last days, being forced to sit and walk in her own warm pee, to constantly wet herself and feel like an un-potty-trained baby again... All for nothing.
The princess closed her eyes in shame, her shoulders slumping down in defeat, while she stewed in the feeling of her wet panties tightly clinging to her crotch, not unlike the way the diaper had clung to her.
At least it had felt good.