It was never a good idea to get on Spoiled Milk's bad side. Her influence could easily render her victim the next town pariah, and she was just spiteful enough to target just about anypony in Ponyville, sans the town's mayor and heroes. She was also very cruel and creative with her acts of petty vengeance; Diamond Tiara understood this all too well.

All her life she had spent trying to avoid incurring her mother's wrath, unwittingly falling in line with every terrible behavior Spoiled exhibited. She didn't want to act like her mother, but it felt like the woman had eyes and ears everywhere, and the moment she did something her mother disapproved of, she knew she was coming home to misery. It also didn't help that some of the ponies Spoiled didn't want her hanging around were in fact some of her dad's best business partners, making trying to stay on both her parents' good sides a near impossibility.

So here she was, having just returned from a terrible hiking trip where she had to rely on those annoying CMC and the two dunderheads from her class to get back home safely, and of course her mother heard about it. How dare she even interact with such riff-raff, let alone stoop so low as to ask for their help; Diamond had heard it all before. What she hadn't expected was her mother's idea of a punishment.

Back when Zap Apple harvest time had come around, her dad had brought her to participate in the preparations as punishment for mocking his best customer, something Diamond found humiliating enough with the bunny suits and all the weird rituals. Apparently her mother also disagreed with this punishment, though of course she just cared about her daughter being made to do farm work. Her parents argued and Diamond was punished again for going through with it, but her mother learned a valuable lesson for disciplining her daughter; she hated to be humiliated.

Diamond had stopped questioning her mother's ideas for the most part, but even she had to wonder just what twisted part of her mind decided to lock her daughter in her room wearing nothing but a diaper. That alone was enough to embarrass Diamond, even with nopony else around, but that's what terrified her more than anything. Sure, she would rather not be sitting in her room like this, but the fact that she was safely somewhere where nopony could see her and humiliate her further meant that her mom had something else up her sleeve, and Diamond dreaded finding out what it was.

A subtle ache in her bladder snapped her out of her thoughts, quickly reminding her that she hadn't actually been to the bathroom all day. Thoughts sprawled through her head of what she was going to do when it became too much to bear, or worse, she had to visit a bathroom for something else. Was her mother's plan to just wait until she had actually used the diaper, suffering even more self-imposed shame? Possibly, but that still didn't seem like enough. Her mother would want others to see her humiliate herself, usually to avoid Diamond just caving and doing what she wants to get it over with.

Every so often, Diamond would sneakily peek out of her curtain to see if anypony was standing outside of her room. Nopony ever was, and that should've made her feel a little better, but her mind just kept running in circles trying to understand just what her mother's goal with this was. Maybe she was just trying to psych her out? Make her think there was more to this ploy than there actually is?

No, that couldn't be it either. Her mother was an absolute bitch, for sure, but she rarely ever resorted to mind games to accomplish her goals. She always preferred more direct and immediate action, so she definitely had something else planned. Diamond paced trying to figure it out, though that task was made increasingly difficult as her bladder egged her for relief.

This brought Diamond to a different dilemma. She was probably going to be stuck using the diaper anyway, and someone was bound to see her wearing it. Who and how she didn't know, but that was beside the point. She could either use it now and get it over with, but risk being seen wearing not only a diaper, but a messy one at that. On the other hand, she could wait for the inevitable, trying to keep the diaper clean along with some sense of her dignity. But that would only mean anypony who saw her like this would see her desperately trying to avoid peeing her diaper, if not being able to watch her pee in it. Neither was a good option, but it would be far more embarrassing for someone to watch her in person rather than it being a thing of the past.

So she resolved to just get it over with, but her body wasn't exactly ready to break years of conditioning just to save her pride. Despite her bladder nagging her harder and harder, relaxing her muscles seemed to do nothing for her; she was stuck until her body itself gave out and conceded to pissing herself. She wasn't too keen to try and coax it out either; it would be even worse to be found masturbating in a diaper.

Her thought were cut off by the sound of her door opening; she quickly ducked behind her bed to avoid being seen by the intruder. A familiar voice called out to her, instantly filling her with dread. "Diamond, are you in here? Your mother said you wanted to see me?"

Silver Spoon. Of course it had to be Silver Spoon. What better way to humiliate her daughter by bringing her best friend in to witness her shame. Diamond had to think of some way to convince Silver to leave, but between her anxiety and that anxiety causing her bladder to ache even more than before, it was nearly impossible to think straight. Still, she at least had to make sure that Silver didn't get suspicious about anything.

"UGH, Silver! I was getting dressed, don't you know it's rude to walk in without knocking?" she berated. Silver immediately began stammering her apologies; it would've been kinda adorable if Diamond wasn't praying to Celestia above that it was enough to make her turn around and leave the room. It would've been, until she heard the distinctive clack of the door's inner mechanisms catching on a barricade. No she didn't...

"Um, Diamond? How do I unlock your door?"

"...you can't." Diamond exhaled in defeat. It didn't even occur to her that the door would lock again after Silver had entered, but now it was so obvious. If her mother wanted her to have an audience, she had to make sure that Diamond couldn't put to use everything she had been taught about getting her way. So now she was stuck, in her bedroom, with her best friend... wearing nothing but a diaper... on the verge of wetting that diaper... could things get any worse?

At least she still had a means to keep Silver from peeking around to actually see her. "Well, I guess I'll just have to stay behind the bed like this."

Silver looked puzzled. "Okay, but that doesn't answer my question. What do you mean I can't unlock the door?"

Diamond's heart skipped a beat; she was so lost in her thoughts she had completely tuned out of what Silver had been saying. "Uh, sorry, yea my mom made it so it only unlocks from the outside. You know, to make sure I stayed in my room when I was grounded." Diamond could feel it getting more difficult to hold her bladder back; she was sure if she let go now Silver would hear it.

"Wait, you're grounded again? Does that woman ever let you not be grounded?" Silver inquired before giving the situation a little more thought. "Hang on, if you're grounded, why did she invite me here?"

Diamond started to panic. Her muscles were getting tired at this point and she could feel the flow of piss trying to work its way out of her system. Between her sore muscles and aching bladder she couldn't really think of any excuse, and she had a hard time not wearing her discomfort on her face.

"Diamond, are you okay? You don't look so good-!" Silver began before Diamond's body finally gave in and an unmistakable hissing come from the other side of the bed. Diamond's bladder had finally won out and she was soaking every inch of the padding wrapped around her crotch. While Diamond closed her eyes to avoid the humiliation, she could hear Silver's soft footsteps around the bed to see the compromising situation her friend had been put in. A short high-pitched gasp told Diamond that she had been discovered, prompting her to hide her face the best she could.

Shame and relief flooded her system as she relaxed and the leak of piss quickly became a torrent, blooming across her nether regions as it seeped into every last corner of the diaper's absorbent material. For a brief moment she had forgotten that Silver was even there, but her ears caught the faintest sound of heavy breathing, reminding her that she had an audience. Watching her piss herself. The shame and humiliation came back full force, overshadowing any other emotion she had given herself to. She wasn't going to let her mother win, though; if she was going down like this, she was facing it head on.

Diamond opened her eyes just the slightest bit, expecting to find her friend halfway across the room with a horrible look of disgust. What she found instead was Silver watching her every move with rapt attention, almost mesmerized by the scene painted before her. The hissing petered out, and Diamond looked down to see that her diaper had expanded quite a bit, forcing her legs apart just enough to be slightly uncomfortable. The outside of the padded garment was stained a faint yellow, and the warmth from her piss enveloped her entire crotch and upper thighs. It almost felt like her lower half was dipped in a sauna.

The fact that Silver was still sitting in front of her threw Diamond off, and for a moment she forgot what she was even going to say. She watched as Silver's eyes darted between the stretched diaper around her waist and the shirt she was... not wearing. Diamond had completely forgotten that she was also pretty much naked, and her best friend was staring directly at her exposed tits. An awkward silence fell between them as Diamond tried to read Silver's expressions, hoping to get some semblance of what was running through her friend's head about the situation. She didn't have to wait long for an answer.

"So, um... what exactly is going on here?"

Diamond sighed as she tried to sit up. "My mom."

"That's... what I thought. This is an... interesting idea, I gotta say."

"That's putting it lightly," Diamond snarked as she turned her head away. "I'm sorry you had to be a part of this, my mom thinks the best punishment for me is to humiliate me in front of my friends. Don't ask me how that translates to 'put me in a diaper for one of my friends to watch', I have no idea." At least Silver was somewhat understanding of her predicament, but this whole mess still meant they couldn't just go back to being friends, right? Things would inevitably be different between them because of 'that one time', and Diamond was afraid their friendship would crumble off of that. Unreasonable, maybe, but wasn't that the entire point of her mom's plan?

That made what Silver said next extremely confusing. "Well, if it makes you feel any better... your mom may have gotten the wrong friend if embarrassment was what she was going for."

Diamond turned back to Silver, the grayish mare's face painted a vibrant shade of pink and her fingers dancing around the hem of her skirt. "What exactly do you mean?" Diamond inquired, watching her friends fidgeting grow even more visible before she finally pulled her skirt up, revealing that she also had a diaper on underneath. Not only that, but Diamond could tell it had already been used, though not quite as obviously as her own. "I-buh-wu-huh- SILVER, why are you wearing that??!!"

Silver blushed even harder as she explained, "Well, to be honest... I never really stopped. Mostly because I actually still need them, but over the past couple months, I've discovered I just really enjoy using them." Her right hand drifted to casually rub the front of her diaper. "I mean, it felt good, didn't it? Being able to just let it go right where you're sitting, feeling the warmth pour out and spread out across your legs?" Silver's tone grew more hushed as she got lost in her imagination, subtly masturbating herself in front of Diamond.

Diamond wasn't sure what it was. Maybe Silver had a point and she did actually enjoy some part of what she just went through. Maybe it was some weird taboo thing where even if she didn't enjoy it, the thought of doing something so against what was ingrained to her was enough to surpass the shame. Maybe watching her cute friend get herself off in front of her was super sexy. Whatever it was, Diamond was getting turned on by it, and her first instinct was to plant her hand against what would've been her underwear to masturbate herself. Instead, her hand found itself pushing an extremely warm and damp diaper against her pussy lips, igniting her nerves in a way she hadn't ever felt before.

Clearly seeing her best friend indulging in her own favorite fetish did quite a number on Silver, as Diamond noticed that not only had she increased her own hand's speed and pressure, but a soft hissing told her that Silver was peeing in her diaper again; apparently the slightest hint that Diamond was on board with it was enough for all of Silver's inhibitions to fade away, and she had quite a lot of them. The moment she started peeing, she leaned forward to press her diaper against Diamond's, grabbing Diamond's breasts and softly kneading them as she ground the puffy garments together.

"Go ahead, Diamond. Pee with me."

Diamond's head was so fuzzy with pleasure that the voice she heard almost sounded ethereal, like Silver was a voice in her own head. Whatever it was, Diamond obeyed, spraying what remained in her bladder across the inside of her nappy as it ran down to pool between her ass cheeks. Silver's own diaper continued to expand, soon dwarfing Diamond's in size; she must've gone out of her way to find some very absorbent ones.

"You know, there's something else we can use these for. Wanna do it?"

Under any other circumstance, Diamond would've undeniably refused such a notion, but between her pleasure-drunken state and watching Silver as she stripped down to nothing but the damp garment secured to her waist, the only priority on Diamond's mind was to keep this feeling going. Even her body was giving her the signals to just let it out. A small nod told Silver all she needed to know.

"Okay, let's do it together. One, two... threeee...!"

Both mares began pushing their shit out simultaneously, filling out what little space remained in their diapers as the plastic garments pillowed out behind them. Silver collapsed forward onto Diamond, her diaper easily swelling over her friend's and preventing it from growing out any further. This left Diamond's poop with nowhere to go but back around, filling every crevice it could find before some of it squeezed out of the waistband. Silver's, on the other hand, expanded her diaper so much that some managed to seep out of the legholes.

All the while, both girls were moaning in ecstasy, lost in the pleasure of the moment. The reality was far better than any of Silver's fantasies, and just watching her friend getting off so much was enough for Diamond to completely ignore the depravity of their consummation and just enjoy the moment. Within seconds of each other they each reached their messy climax, coating their diapers with the mark of their combined orgasm. They laid together, riding out their pleasure high before exhaustion got the better of both of them and they passed out in each other's embrace.

Diamond and her mother waved goodbye to Silver as she left to return home. Spoiled wasn't entirely sure how they were still so amicable, though she chalked it up to a face they were putting on to leave her none the wiser to their now strained friendship. Once she had shut the front door and turned away, she spoke over her shoulder, "I hope that you've learned a valuable lesson today, dear."

"Oh don't worry mother. I learned plenty today," Diamond replied, a soft crinkle playing out as she walked back to her room.

Author's Note

Wanted to get at least one more chapter out before the end of the month, and my internet decided to be a pain again so here we are. I wanted to do a chapter with at least one character who simply never stopped using diapers, and I thought it would be cute to do that with Silver Spoon. Got chapters prepped for Coco/Rarity and Princess Cadance, but Coco's is basically going through a full rewrite, as I'm not happy with how the original was turning out.

With that being said, I hope you enjoy this chapter, and look forward to more in August!