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Rainbow Dash’s punishment for her over-the-top pranking continues~ After being forced to wear a diaper by Twilight, Rainbow has already peed herself with it on… but Twilight isn’t satisfied with just that - she wants it to be fully used. That means Rainbow is going to have to hold in more than just her liquid waste to prevent her diaper from turning brown~ And of course, Twilight happily continues to tease and mess with the pegasus, even using her as a hoofrest~

Hello, diaper lovers and messy ponies! This story is a continuation of a commissioned series, in which Rainbow Dash is forced to wear a diaper by Twilight Sparkle! After peeing herself in the last story, the pegasus is denied the request to change her diaper… and she soon realizes she’ll have to fill it with more than just urine! Twilight’s teasing continues - the alicorn is clearly loving her new pegasus toy~

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This story contains: FxF, unwilling sub, omorashi, diaper play, wetting, messing, desperation, teasing, bondage~
Word count: 2786

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	Rainbow Dash was not the type of pony who enjoyed sitting around doing nothing. 

	In fact, she was the exact opposite. To her, sitting around and doing nothing was basically on par with being dead - she couldn’t stand it. Boredom was torture. She’d do anything to entertain herself.

	But right then, all she could bring herself to do was sit silently. 

	Rainbow Dash had just done something that was the exact opposite of cool: she’d pissed herself, while wearing a diaper, right in front of Twilight. And what’s worse, Twilight had clearly enjoyed it… and she wanted Rainbow Dash to go even further. 

	It had only been a few minutes since the first accident. Rainbow Dash was lying on the ground, trying not to look at Twilight, her whole face red as a strawberry. Her diaper was still full and used; the bright yellow, lemonade-like hue was a clear indicator that it was far from clean. The warmth and dampness, along with the squishing sensation it made whenever she moved, grossed the pony out, just reminding her of her humiliation. “Come on, Twilight, can’t I at least put on a new diaper?”

	“Don’t make me put a muzzle on you, too,” Twilight threatened, sipping a cup of coffee. “I told you - I’m not changing you yet. I’ll change it once you’ve made full use of it.”

	“Ugh, what does that even mean!?” The pegasus rolled onto her back in frustration. “Twilight, this is horrible!” 

	“You’re gonna figure out what it means soon enough~”

	As if on cue, Rainbow Dash felt a bit of pressure in her digestive system, especially focused on her stomach. Her embarrassment only grew as she realized what it was - she normally wouldn’t have felt any sense of shame about this, but in her current situation, it was hard not to. “Twilight… I really need to use the bathroom…” the pegasus said, turning to look up at her friend. Twilight was like a princess sitting on her throne. “Like, really badly this time. Worse than before.”

	“Ah, finally.” Twilight closed her book; her horn began to glow brighter. “I was waiting for this~”

	Rainbow Dash’s eyes widened in fear when she saw the alicorn’s horn glow; she was beginning to associate that with being bound and tied in different ways. “Um, y-you’re going to let me actually use the bathroom now, right? Making me… do… this…” she motioned to her bright-yellow diaper, “Was bad enough. You aren’t going to make me do that, too, r-right?” She sounded unsure as she spoke; she had little confidence at this point. Twilight’s humiliation was ruthless.

	“I’m not going to make you do anything~” A magical bar formed between Rainbow’s hind legs and between her forelegs. Each bar had a shackle on the end, which quickly connected to the ankle of the corresponding leg, and stretched them out, holding them firmly in place while spreading them wide. Her body slowly floated from Twilight’s magic until it was in a standing position, and she then floated in front of the armchair, the hoofrest moving out of the way to make room for the pegasus. Twilight propped her legs on Rainbow Dash’s back, using her as her new hoofrest. “But, well, I’m not letting you take your diaper off… and I want to make sure you stay close, so I’m not letting you move too much either~” A magic rope tied Rainbow’s tail down to her legs, and then collared and leashed her head yet again. The alicorn placed the leash underneath of her on the chair. “You make for very comfortable furniture~” Twilight said, snickering. “Rarity would love this. Maybe I should give her some ideas~”

	“Twilight…” Rainbow Dash couldn’t even squirm like this; she was being weighed down by Twilight’s hooves, her own hooves entirely restricted, even her tail and head unable to move. “I-I don’t think I can hold it that long. If this is a joke, this would be a good time to wrap it up!” The pressure was increasing; she felt an ache in her stomach. Instinctually, she wanted to put a hoof to her belly, but she couldn’t, of course. All she could do was stand and let it happen, let the pressure build and mount. Even clenching her rear wasn’t doing much to stop it; her defenses were slowly waning, slowly being broken, as her body kept pushing. 

	“Do you really think I would do all of this for a joke~?” Twilight snickered. “Don’t try to hold it in - I’m a very patient pony. I’ll happily sit here, all day, using my new, fuzzy hoofrest, while you stay in that position, all bound up by metal bars and ropes~ I’m sure that’s not too comfortable - I’ll undo it, as soon as you just let it out~” Indeed, Rainbow was in an incredibly uncomfortable position. The worst part was her hind legs being spread - it made it nearly impossible to hold anything back. All she could do was use her sheer force of will to stop her guts from emptying themselves into the damp material of the once-white diaper… and that willpower was not doing well for her at that moment. 

	The pressure mounted; she focused, letting out little groans, as her stomach continued to ache. Her body was begging her for relief, even harder than it had before, and it wasn’t going to hesitate to break through her resistance if it needed to. At this point, it was really only a matter of time until the pegasus finally lost all control… right in front of Twilight… for the second time. She closed her eyes tight and gritted her teeth. “Twilight… p-please, please let me use the bathroom!”

	“Nope~” the alicorn simply replied. “Like I said, you should just let it out~ It’ll be so much easier that way.” She closed her book. “In fact… it seems like your body’s getting pretty close to listening to my advice, regardless of whether or not you want it to~”

	Again, Rainbow’s legs were shaking; she breathed heavily, sweat dripping down her face. “Ah… I-I can’t hold it!” she proclaimed, her rear shivering and shaking. “Twilight!!”

	“Call my name all you want - it won’t change anything. It is cute, though~”

	“Hnngh…” She let out one last simple grunt as she tried to hold it back… but her muscles were now ignoring her brain. Suddenly, the pressure began to move… and then it began to decrease…and Rainbow stopped shaking, suddenly letting out a mix between a sigh and a moan in relief. Mildly wet sounds filled the quiet air as her diaper bulged out, suddenly turning a dark shade of chocolatey brown on some parts outside, though still retaining the yellow in other spots. She bit her lip and kept her eyes closed, wishing she could hide her face or fly away, as her diaper began to sag and expand, swelling as it got fuller with each passing moment. 

	“Hahaha~!” Twilight laughed out loud, getting up and running to look at Rainbow’s backside. “I can’t believe it - you actually did it~” She covered her nose as the horrid scent filled the air. She’d never seen Rainbow Dash in such a pathetic, humiliating state. “Oh, you poor thing~ You’re like a foal who can’t find her mother~” She walked to Rainbow’s front, laughing at her ever-brightening blush. “Aww, did poor Rainbow Dash have a little accident~? Does somepony need to have their diaper changed~?”

	“T-twilight…” Rainbow’s voice was squeaky; she looked away from Twilight in shame, only for the alicorn to put a hoof against Rainbow’s face and move it back. 

	“You’re so cute like this, you know that~?” Twilight giggled. “Ahh, I wasn’t going to take any pictures, but…” A camera floated into the room; the alicorn held it in her hooves. “I have to get at least one~” SNAP! The alicorn took a quick photo of the scene, an instant film picture soon coming out. “I’m going to be keeping this~”

	“P-please don’t let anyone else see this…” Rainbow bit her lip, opening her eyes a bit, just to see Twilight’s dominant, confident, sadistic expression.

	“Don’t worry, Rainbow - I’m keeping this all to myself. Not a single other pony will know about it, I promise~” The picture floated back into her room, along with the camera. “Well… I might tell our other close friends that I had some fun toying around with you, but I’ll leave out the details on the diaper and your unfortunate little accidents~ Unless, of course, you decide you want more from all of us after getting taste~”

	“No way,” Rainbow Dash immediately responded, shaking her head. “I can’t imagine ever wanting to do this again.”

	“We’ll see how long you stick with that~” The bars between Rainbow’s hooves disappeared, as did the rope on her tail, though the leash remained. “Come on - let’s go to the bathroom. I’ll wash you off and get you a nice, fresh diaper~”

	“W-wait, I have to put on another one!?” Rainbow’s mouth fell open. “Twilight, please, I swear I’ve learned my lesson! I’ll never prank you again, I promise!”

	“It’s not about that, Rainbow Dash - I just want you to be a little more mindful about spacing your pranks out so that they don’t get overwhelming. A little prank here and there is fine, but an entire month makes it excessive and annoying. Maybe you’ll get what I mean after you’ve been forced to use diapers for, say… I was just going to do 24 hours originally, but let’s try a week~”

	“A week!? Twilight, I have things I need to do! I can’t go around performing with the Wonderbolts in a diaper!”

	“You don’t need to worry about that - I already called and said you’d come down with a bad flu. They’ll manage without you for a little bit, and when I’m done with you, you can go right back~” Twilight grabbed the leash and pulled Rainbow along, toward the bathroom. “Come on~”

	“Mmm…” Rainbow put her head down and followed, still in disbelief. She already felt like she’d experienced one of the worst things she could imagine, and now, she was being told she’d have to deal with it for a whole week. But, then again… at least it was Twilight, her close friend, and not somepony else. At this point, she probably should’ve been questioning her friendship with Twilight… but it wasn’t like this was their first time doing kinky stuff. The mane six as a whole had explored some more sensual stuff together in the recent past; Rainbow Dash should’ve realized that Twilight’s teasing wasn’t a joke. No matter how much Twilight dominated the pegasus, Rainbow still saw her as a very close friend… and a very hot one, too, to the point where it would be difficult for Twilight to do anything that could make Rainbow feel otherwise. Even when the alicorn was going as far as to humiliate her to this extent. That didn’t stop it from feeling like a punishment, though, and that was obviously the princess’ intent.

	“Here we are.” Twilight tied the leash to the bathroom’s handle on the outside. “Wait here for a second - I need to use the bathroom~” She put plenty of emphasis on that statement, making sure to rub it in. 

	Rainbow grumbled as the alicorn went in; she tried not to listen to the sounds of Twilight enjoying her time in the bathroom, but the loud flushing was difficult not to notice as the pegasus sat in her full, dirty, used diaper. Eventually, the alicorn came out, flipping her mane, looking refreshed and satisfied, even letting out an exhale of relief. “Do you really have to rub it in so much?”

	“Of course~ I’m not the one who needs to be punished, am I?” She pulled Rainbow into the bathroom. “Hop into the shower for me.”

	Rainbow did as instructed; she instinctively went to use her wings for that action, but of course, they were still bound, resulting in only a lame, sad little jump. Twilight put a hoof to her mouth as if trying to hide her obvious amusement; Rainbow stepped in, successfully this time. 

“There we go,” Twilight said. She used her magic to remove the diaper, the padlock unclicking and disappearing. The water turned on; Rainbow went to start cleaning herself, but as she did, she froze in place, Twilight’s magic paralyzing her whole body. “Hold on~” Twilight stepped into the shower, grabbing the shampoo and putting it on her hooves. “I can’t let you clean yourself - how can I trust you to do that when you can’t even hold in your own waste~?” 

	“Twilight, you can’t be serious. I haven’t had another pony clean me since I was a foal!” She sheepishly looked back at the purple pony, who was now rubbing shampoo into the pegasus’ lower back. 

	“You probably haven’t used a diaper since you were a foal, either, but that isn’t stopping me~” She moved her hooves down, nearing Rainbow’s private parts. Even if they didn’t normally wear clothes, ponies still tended to consider those parts more private; Rainbow’s heart sped up, her blush glowing radiantly. 

	“T-Twilight, b-be careful back there!”

	“Oh, oops.” The alicorn moved her hooves back. “Do you mind, Rainbow? I won’t touch you there if you’re not comfortable with it. But if you let me, I think you’ll enjoy it~”

	If Rainbow possibly could’ve blushed harder at this point, she would’ve. She gulped. “I’m surprised you’d make me use a diaper against my will, but you’d still ask about that…”

	“I still care about you, Rainbow - I wouldn’t touch you in that way without your permission. The diaper is different, trust me - that’s just a bit of harmless bullying~”

	Rainbow wasn’t sure she agreed with Twilight’s assessment… but still… “Y-you can… g-go ahead…”

	“Perfect~” She soon rubbed her hooves down Rainbow’s crotch, passing over her privates; the pegasus bit her lip, careful not to let out any sounds of pleasure or enjoyment, even though the alicorn’s touch to such a sensitive area sent shivers up her spine in the perfect way. Though, before she knew it, it was over; Twilight had cleaned her off, including her rear and privates, and the alicorn even went to the effort of drying her off by hoof, no magic required. “There we are~ Good as new~”

	“Does that mean we’re done?” Rainbow asked, hopefully. 

	“Nope!” Suddenly, a new diaper flew into the bathroom, and immediately wrapped around Rainbow’s privates. “But for today, I’ll let you off the hook. We do need to have dinner, though… and I’m going to make sure you get plenty to drink~ I can’t have you leaving that diaper dry tomorrow~”

	Rainbow shuddered; this was barely even the beginning. She had a long way to go before this would finally be over.

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