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A couple weeks ago, a nameless user on a certain imageboard posted a prompt that I really liked. I asked him if I could use it, and he allowed me to. Here is the prompt: "Twin sisters plan to dress as each other for Halloween. However, while one is an ordinary grill, the other is a Little. It's an AB friendly world, Littles are identified early on, never potty trained, kept off solids, not subject to the same education system, etc. They plan to go to a neighborhood party, the Big in all her sister's clothes but a cat ear headband and make up whiskers to at least be in a more obvious costume. The Little really wants the Big experience, and doesn't let her sister know that she didn't wear her diapers, instead sneaking a pair of panties. She should probably spend a lot of time mesmerized by the panties, the insane thinness, the texture, how she feels absolutely naked. And how she personally believes that it's the underwear that let's Bigs use the potty, so she erroneously thinks she'll be fine at the party despite never having held an ounce of anything back before. Of course an accident happens at the party, I'll leave punishments up to you, but the Little should complain a lot about how the diaper ruins her twin costume." Hopefully this story is up to that person's standards, and that I didn't deviate too far away from his prompt. Sorry for any grammar, spelling or general story-writing mistakes. Please enjoy. -- Panties. Actual, real, cloth panties. Thin, thin, thin! Kaylee wasn't just holding them. She wasn't just seeing her twin waltz around their apartment, flaunting them. Kaylee was wearing them. Despite it being un-ladylike, she couldn't help but keep her hands in her leggings, just feeling them. It was such a strange feeling, compared to her usual diapers. Thick and plastic, they added a layer of bulk and fluff around her crotch. She wiggled a bit. It was almost like being naked. Wearing a bra was maybe a more apt comparison. Normally, she wore diapers. Big, crinkly diapers. Sometimes they had cute designs, sometimes they didn't, but they were never undergarments that could be considered grown-up. No, mature. Mature is a much more grown-up word. A slight blush appeared on her cheeks at the thought. Her, wearing something other than diapers, being so mature. In the whole world, no other piece of clothing could make her more mature. Panties were the pinnacle of adulthood in her eyes. Thin, sleek, noiseless panties. She wasn't sure if they could be described as comfortable, but they were something she coveted. They weren't an object of desire just for their matureness alone. Although, Kaylee would admit—a million times—how big of a difference such a small article of clothing could make in self-image. Kaylee had a feeling that panties did more than just make someone look mature. Kaylee had never been potty-trained, like many who shared her social status. Although she knew potty-training was a thing, and she understood the ideas behind it, she had a bit of a superstition regarding underwear: What you wore determined your ability. If you wore diapers, you wouldn't make it to the potty. If you wore panties, you'd be able to hold it for hours. Deep down, she knew it was illogical. She had no evidence to back that claim up. Why wouldn't everyone wear adult underwear from the get-go? She didn't know. She just had a hunch. Hope, really. A hope that she had always kept to herself, ever since childhood. Now that she was wearing the coveted item of clothing, she felt emboldened. She wasn't supposed to wear them, since her sister thought she'd have an accident, but she snuck them on earlier. She had to. Tonight was her chance, and she had to know. It'd been at least ten minutes, and she hadn't yet wet herself. To her, it seemed like the theory was holding up. She was potty trained now. Even if she somehow really wasn't, she was just glad she got to experience the feeling of wearing an adult's underwear. It's just so incredible. Panties! Thin! Not plastic! Cloth! Mature! The slam of a door caused her hands to shoot away from her crotch, and it put a cease to her wiggling. It suddenly felt warm around her crotch. No, she couldn't have. She was wearing panties now. Kaylee instinctively sat up straighter, although she probably didn't notice the change in her own posture. Nothing was wrong. Not at all. It was just the heat from her thighs being closer together than they had ever been. She definitely didn't wet her mature underwear. Hailey, her sister, popped around the corner that lead into the hallway. She was done changing into her costume. She would've checked. She would've put her hands back to her crotch. However, Kaylee couldn't afford to let Hailey see her being so crude. That was the least of her problems, though. She couldn't let Hailey know that she was wearing panties, nor could she give an inkling of the impression that she might've wet herself. She really didn't want to be punished, not tonight. The potentially wet girl turned to look at her sister. "So, how's it look?" Hailey stuck her arms out and did a twirl. Hailey wasn't normally a twirling kinda girl. 'Adorable' was the first thing to pop into Kaylee's head, so that's what she went with. It was ironic, as that was usually how people described her. "Adorable." A big grin spread across her face. Her posture slackened. This was gonna be a great Halloween. Hailey was dressed like a kitty. She was garbed in a black onesie, which did little to hide the diaper around her waist. Kaylee could tell it was one of her overnight diapers. Thick, black tights adorned her legs. They extended all the way up into the onesie. A long black tail was attached to the rear of the onesie. The tip of Hailey's nose was black, and three black lines adorned each of her cheeks. Two cat ears, as black as her hair, stuck out of her head. Anyone that looked at her would see an adult baby, ready for an amazing Halloween. Anyone that looked at her would see Kaylee, not Hailey. Hopefully, anyone who saw Kaylee would see Hailey instead. That's what they wanted. The two were twins, and they had decided to go as eachother for Halloween. It wasn't a totally original idea. Tons of people would dress up as those they knew for the holiday. Schools had been doing "Twin Day" for spirit week since the beginning of time—not that the twins ever would've done that before, being sent to different schools and all. It wasn't an uncommon concept. What made it different, and interesting to the both of them, was who they were. Kaylee was an adult baby—or little, depending on who you talked to. Hailey was the opposite. Some might call her a big, but she didn't care for identifying herself like that. She preferred to be called an adult, if she was to be called anything. The exemplified the two types of people that existed in their world. Roughly thirty percent of people were considered adult babies. Some, like Kaylee, decided to never potty-train, if you could call childhood stubborness a decision. Some chose their station in life while young, others chose it quite late. Some dabble in it, while the majority make it a lifestyle. Whatever their story, they existed as a distinct group. Grown-ups, adults, those deemed mature by society, were the opposite. A majority of the population existed as they had since time immemorial. Some adored adult babies, and these people supported the lifestyles of many. Others just went about their lives. Hailey was firmly in the second grouping. She didn't want to adopt an adult baby, like some of her peers. She didn't visit the rent-a-baby nurseries that were currently in fashion. She didn't directly dabble in the culture, like some of her more adventurous friends. She tried to be as normal as possible. Why did she jump on the idea of being her twin for Halloween? Kaylee had no idea. Hailey was normally as far from adult-baby culture as possible. It had been Kaylee's idea. An idea that she had little hope for her serious, mature sister to entertain. To her shock, Hailey embraced it. She was even the one to suggest going as cats. She had even picked out that specific costume, which was a far cry from Hailey's usual low-effort ensembles. Kaylee felt underdressed in her sister's idea of a costume: black leggings, a black hoodie covering a t-shirt and a cat-ear headband. "Well, are we ready then?" Hailey asked. Kaylee snapped out of her slight daze and nodded her head a few times. "Remember, you're acting like me tonight. Turn on your big-girl mode, ok?" Hailey herself began to activate little-girl mode. Today, she was the overgrown baby. She'd have to start acting like it. "Sure, sure! Let me go grab my bag, then." She put emphasis on 'my.' She was Hailey now, not Kaylee. She was a mature, adult. Everyone, even their friends, would be none the wiser. She stood up and made towards their kitchenette, where Hailey usually set her bag. Only, she had forgotten something. "Kaylee. May. What's this wetspot on the couch?" Kaylee froze. Hailey's reactivated her adult mode instantly, if she had ever really deactivated it. "And why don't I see any padding on that heiney?" "Uh, well, you see..." Kaylee didn't have much of a defence for herself. She knew the rules, and she knew her body. Hailey only let Kaylee move into her apartment, since she agreed to her rules. Their parents only let Kaylee move into Hailey's apartment, since Kaylee agreed to her sister's rules. Rule one: Hailey is an adult, so what Hailey says goes. Rule two: Diapers all the time. Hailey didn't want her furniture or her carpet ruined, which Kaylee could easily do without noticing, like she just had. Hailey sighed. She wasn't angry, but Kaylee should've known better. "I know you want to be a grown-up tonight, but grown-ups know their limits, rights?" Kaylee nodded, and she started tearing up. She was in so much trouble. "That's why I told you to wear a diaper. You know the rules, sis." "Y-yea. I do." Kaylee stuttered. She was normally a really good girl. Not once had she broken one of her sister's rules. She felt the opposite of mature now. The panties were such a silly idea. "Now, now," The other twin was already in another room, grabbing a few things. She returned as quickly as she had left the room. "You're not in trouble. Too much trouble, at least. We're just gonna get this taken care of, ok?" Kaylee nodded her head, more demurely than earlier. If it had been any other night, Hailey thought, she would've actually punished her twin. Maybe a spanking, maybe a time-out, but not tonight. She wanted tonight to be perfect just as much as her twin did. Before Kaylee knew it, she was naked below the waist, and a changing mat was on the floor. "Hailey, please not tonight. I'm supposed to be a big girl." She was tearing up more, and the mature twin felt a tantrum on-coming. "Big girls wear diapers too, plus, no one's gonna notice." She wasn't totally sure about the later statement. None of Hailey's pants would hide a diaper, and Hailey almost never wore skirts or dresses, which might ruin their costume idea. She'd have to think of something. "B-but, panties!" "C'mon. It'll be okay. Lay down, so there's not anymore of a mess." Kaylee obeyed, and the whole ordeal was over in no time. Glancing at her now-soaked panties, Hailey was just glad it wasn't a pair of her 'sexy' undies. Kaylee had somehow picked out the plainest pair in the dresser. Both the leggings and the panties ended up in the trash. Hailey wasn't too interested in wearing those ever again. "Sis, there's no way anyone's gonna think I'm you in this." Kaylee tugged at the hoodie, trying to cover-up a bit. She wasn't normally one for modesty, but she had felt so adult earlier, the sudden shift was a bit much. "Don't worry, I'm thinking of something." Hailey was already cleaning the stain on the couch. There was a bottle of pet-stain remover laying around just for this occasion. Hailey wasn't totally sure it would work, but it was better than any other option. "What made you wear my panties, anyway?" She tried not to be too accusatory, her sister was beating herself up enough. The poor girl hadn't moved from by the changing mat. The loss of her first pair of panties was devastating. Her sister reminding her of her reasoning somehow made her feel worse. A stupid, childish delusion. She explained the reasoning, and she pouted when Hailey laughed. "That's something else. Mom's gonna die, when she hears that." "I'm serious, Hailey. It's not funny." Kaylee was one step away from stomping her foot. "I believe it. Never doubted you. It's just funny." Hailey paused. "It is not! Not funny at all." Another tantrum. This girl was on a short fuse tonight. "All I want is to be mature." Unlike some, it was a bit hard for Kaylee to suddenly decide to not be an adult baby. There were a few failed attempts at potty-training during their senior year of high-school. Hailey knew she'd have to nip this one in the bud too. She could not let a tantrum go unpunished, but she didn't want to ruin the night either. A solution popped into her head, one that might not work. One that she was apprehensive about. A solution that made her stomach turn with so many emotions. She wasn't against it, but she didn't know if she was ready to take this step. Forcing herself, she strode towards her sister, took her hand, and she placed it on her crotch. On one hand, this wasn't something you taught an over-grown toddler to do. On the other hand, they were the same age and Kaylee knew this was an exception. Hand in place, Hailey pushed. She knew she had to pee, at least a little. With effort, the dams burst. It felt like she absolutely flooded the diaper. She was a bit worried, despite knowing Kaylee could wear one for a full twenty-four hours with no leaks. Her cheeks were flushed. Embarassment, excitement and a bit of disgust rose in her. She almost felt the adrenaline. "S-see Hailey? Big sis is a potty-pants like you, now." She waited on edge for the response of her immature twin. "What do you mean?" Kaylee had a dumbfounded look on her face. "Did you wet yourself? I didn't feel anything." She bent over, looking as if she was inspecting her twin's nethers. Hailey backed up. How dumb, she thought. These are premium diapers. No way anyone would be able to feel her wetting through them, especially the first wetting. That thought made her blush even more. It was just a first wetting. Hailey was brought out of her thoughts by Kaylee's giggling. "Cute, super cute!" She wrapped her arms around Hailey, hugging her. "It's super cute that you would do that for me." The loss of the panties was momentarily forgotten. "That's what big sisters do." A nervous laugh escaped her lips. She couldn't believe she did that. Now, she was gonna be going to the party like this. She couldn't begin to imagine. She hadn't been this embarassed—at such a loss—since high-school. Suddenly, it came to her. The memory of a certain Halloween arose in her. The memory of an old costume, one that would fit perfectly with their theme. "I think I've figured it out, Kaylee." The twin headed towards her room, specifically her closet, while ignoring the sensations between her legs. She kept most of her clothing, even silly costumes. If it still fit, it stayed. No sense in wasting things, right? "Wait," Kaylee followed after her sister. "What is it, what is it? Panties?" She knew better, but she couldn't help but throw that possibility out there. "No, silly. Something that'll cover that crinkly butt." And there it was. In the very back of her closet, a witch's outfit, complete with hat, that she had worn their junior year of high-school. Hailey was never oen for dressing up, but her Trigonometry teacher had promised bonus points to those in costume on Halloween. Obviously, sacrifices had to be made. It was a cheap garment, but it had held up well. Better yet, it would still fit either of them. "How about this?" Hailey held the costume up to Kaylee. "That's not panties. It also doesn't seem very mature. It also also doesn't seem very like you. It also also also isn't a kitty. We won't be matching anymore." A slight frown formed on her face. "Well, think of it like this. You're a witch, and I'm your familiar." She knew Kaylee would go for this. Her eyes lit up. She loved the idea. She almost wished she could be the familiar, but that wouldn't work. Not this Halloween, at least. "What about everything else?" "It does seem very like me, since I bought it and wore it a few years ago. It does seem mature, because we can say Hailey dressed up at Kaylee's insistence. I'll play that bit up, if I need to. And, it is definitely not panties. Not much I can do about that one." Hailey answered each complaint in turn. This would work, she'd make sure of it—as much for Kaylee's sake as her own. She wanted this night just as badly. She might've wanted it worse. "Go ahead, try it on." Hailey encouraged. Kaylee deftly slipped out of the hoodie, removing the cat-ear headband first, and slipped the silky-smooth dress on. She then adorned her head with the pointy, black hat. A complaint about shoes almost escaped her lips, but Kaylee remember that she had a pair of black mary-janes that would compliment the outfit. She would put those on before they left. "It's no panties, but what do you think?" Hailey smiled, sure that her sister would love it. The smile was returned. "I think it'll be an amazing Halloween. Now, let's go, potty-pants. We have a party to get to."