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Rainbow Dash has peed herself and messed herself in her diaper… but Twilight still isn’t done tormenting her~ Now, it’s night time, and Twilight ties Rainbow up in her room… but not just to sleep! Turns out the alicorn has some ideas up her sleeve; as she pulls out a vibrator, Rainbow Dash soon realizes she’s in for a long night~ Too bad for her, Twilight has no plans of letting her cum~

Hello, chaste and desperate ponies! This story is a continuation of a commissioned series, in which Rainbow Dash is forced to wear a diaper by Twilight Sparkle! This time, the unicorn ties up Rainbow Dash and uses a vibrator on her while she’s still diapered up, overstimulating her~ Will the pegasus be able to hold back her bladder? Unfortunately for her, she isn’t even getting the good part of a vibrator, as Twilight fully plans to keep her chaste through any means necessary~

Want to see more cute subs embarrassing themselves in diapers~? Join my Patreon, and get access to over 100 exclusive stories, early access to everything I post, and more~ Only $5, and it all goes to a bunny girl who would love to put you in padding~~ <3
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This story contains: FxF, unwilling sub, omorashi, diaper play, wetting, messing, desperation, teasing, bondage, chastity, vibrator, overstimulation, humiliation
Word count: 2535

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	That night, Rainbow had enjoyed a nice, albeit very teasing and domination-filled dinner with Twilight… all while the alicorn made sure that the pegasus ate and drank far more than what seemed necessary. Afterwards, Twilight had wanted to just relax for a while, though that relaxation ended up involving Rainbow Dash being a hoofrest yet again. At least she wasn’t desperate this time… though, the boredom of acting as a piece of furniture almost made her wish she was holding her bladder or bowels, just so that, at least, something was happening.

	Though, when she had that thought… she couldn’t help but notice that she’d felt the slightest little pang of desire. Almost like she’d enjoyed it… and she wanted more. She quickly shook off those feelings; that was an insane way to be feeling about wearing and using a diaper, of all things. But even as she tried to sit and think about something else, her eyes kept going to the satisfied, dominant expression on Twilight Sparkle’s face… and it was beginning to make Rainbow Dash feel a way she hadn’t felt before. The humiliation and shame were horrible and painful, but at the same time, her feelings about it weren’t entirely negative. 

	Well… it was still mostly negative. Anytime Rainbow’s blush faded, it quickly came back in full force, either because she’d remembered what she’d done earlier, or because Twilight had reminded her. “You look so adorable in this photo~” the alicorn would remark over and over, in slightly different ways, even letting Rainbow Dash take a look at her own figure in the soiled diaper. The pegasus was quick to try to convince her not to take any more, but Twilight almost seemed like she was ready to fill a photo album with these embarrassing photos. 

	Eventually… “Alright, Dashie - it’s starting to get late.” Twilight had resorted to only calling Rainbow Dash by embarrassing pet names at this point; of course, Dashie was her favorite, a term that made the pegasus feel like she was getting smaller every time she heard it. “I think we should head to sleep.”

	“Yeah… where am I going to sleep? You aren’t going to tie me to my bed or anything, are you?”

	Twilight chuckled. “Don’t worry, Dashie - I’ll make sure you’re comfortable~ Very comfortable~”

	“That, um, that wasn’t a no…”

	“It sure wasn’t~ Come on~”

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	Rather than letting Rainbow Dash sleep in one of the many spare bedrooms included in the magnificent, sprawling castle, Twilight led the diapered pony into the alicorn’s own bedroom. “I’m not sleeping on the floor, right?” Rainbow questioned.

	“Stop being so worried - it’s not going to be that bad~ And besides… we’re not going to sleep right away anyways~” The bedroom door slammed shut, a padlock appearing on it. Immediately after, Rainbow Dash felt magical rope wrap around her body in an intricate, shibari-like manner, binding all of her hooves together, bending her knees, spreading her thighs, even the chains on her wings being removed just so the ropes could more elegantly tie them down. Only her head was spared; the rest of her body was tied intricately to a wooden chair, seated on it with back hooves spread and front hooves tied behind her. The alicorn soon produced, from a drawer in her desk… a purple wand vibrator, with a large ball at the top and a more curved handle to hold. “I’m sure you’re getting desperate in more ways than one after all of this, aren’t you, Dashie~?” Twilight snickered. “I hope your bladder isn’t too full right now, because otherwise, you’re going to be having a very rough accident~”

	Rainbow’s face went red yet again; admittedly, she had started to feel a little horny… and now, it seemed like that was going to be taken advantage of. She couldn’t help but remember Twilight’s hooves touching her so sensitively. “T-twilight, t-this is…” 

	“What’s wrong, Rainbow~?” The pony put the vibrator against the diaper, pushing it in, making sure the pegasus could feel it against her slit, though it wasn’t yet turned on. “I have no problem with just letting you watch me pleasure myself… but I doubt that’s what you want~”

	Rainbow Dash shuddered at the sensation, the light stimulation; her horniness was now skyrocketing, quickly peaking much faster than it had before. “I-I…” She gulped. “I, um, but… I-I already have to pee a little…” She hesitated to admit such a fact, but at this point, her shame wasn’t enough to stop her. Her legs were already beginning to let out the slightest bit of a quiver. 

	“Oh, really? That’s just perfect then, isn’t it~?” Twilight smirked. “Hold it in while I play with you, and I’ll let you orgasm. Otherwise… well, I happen to have a spell for putting a stop to that sort of thing~ Trust me, it’s not a pleasant sensation - you’ll be pent up all night~”

	“T-that’s horrible!” Rainbow quickly responded, biting her lip in fear. “All night!?”

	“That’s right, all night~ I’ll let you decide right now whether or not you want to risk it, but I’m probably not going to give you another chance to do this for a long time~” Twilight put a hoof on the vibrator’s switch. “Well, Dashie~?”

	The pegasus heavily considered it for a moment; if she accidentally lost control of her bladder and wet herself while Twilight was pleasuring her, it would be beyond embarrassing… but at the same time, the sensation of the wand pushed against her diaper was surging her desire for the pony to press that button so badly, she couldn’t help herself. “Ok, do it!”

	“That’s what I expected~” The lights in the room went dim; Twilight flicked the switch, and immediately, the vibrator did as expected, beginning to vibrate. The diaper’s material was thick and absorbent, but not enough to stop the pleasurable sensation from getting through; Rainbow immediately felt a moan coming. She tried to stifle it, but she couldn’t help but let it out, much to her embarrassment and Twilight’s amusement.

	The pegasus began to squirm, left and right, her hind hooves and front hooves all shivering from the sensation, her eyes going up as she let out more cute, small, high-pitched moans from her enjoyment; Twilight was eating it all up, one of the alicorn’s own purple hooves soon making its way to her own clit so she could pleasure herself as well. However, although Rainbow Dash would’ve liked to just enjoy the sensation to its fullest, she had another problem to contend with. 

	With her legs spread so far apart, and all that stimulation right on her crotch, her bladder was beginning to ache far worse than she’d expected. Her cheeks grew hot and scarlet as she dug her teeth into her lip; she couldn’t tell which one was coming, whether she was about to orgasm or piss herself. The sensations were just too similar in that moment, and to make things even worse, Twilight turned the vibrator up, causing it to make far more of a devastating impact on the pegasus’ will and ability to hold back. 

	“T-T-T-Twilight!!” She moaned out; she couldn’t think of anything else to say. Her legs were now shaking like she was in an earthquake, or like she’d just stepped off a boat. She had to close her eyes to focus on not pissing herself, but the very action of holding that back held her orgasm back as well, and both of those desires of her body were now fighting for control, fighting to be let free. The sensual, indescribable pleasure born from Rainbow’s lust along with the aching, pounding feeling of her bladder trying to release its contents created a storm of emotion and sensation in her body. “Urghh… ahhh~!!” 

	Twilight held the vibrator in place with magic, even pushing it deeper, pressing it harder. She stepped up onto the chair with her two front hooves, one on each side of the pegasus, encapsulating her body, whispering in her ear. “Come on, let it out - it won’t be that bad~ You’re going to have to piss eventually anyways~” Twilight’s words were sultry and smooth; in her mixed-up, dizzy state, they almost made Rainbow let her guard down entirely. “Come on, it won’t be that bad if you can’t finish - I know I’ll enjoy it that way, at least~ I’m sure it would be so cute to see you pouting about me denying your orgasm - squirming in your chair from the discomfort of being right on the verge, but never being able to release~” She chuckled, tickling Rainbow’s ear with her warm breath. 

	“Twilight… nhnn… i-it’s too much, I-I can’t hold it in!” 

	“Then don’t~” Twilight pulled herself up; she kneeled on each side of the chair and hugged Rainbow Dash, putting the pegasus’ head into her fluffy chest, embracing the diapered pony in a warm, comfortable, guard-dropping sensation, while pushing the vibrator in a bit further. “Just let it go~ Though, I don’t know if you mean your orgasm, or your bladder, at this point~ I guess we’ll be finding out soon~”

	“Twilight… ahhh~!” Rainbow Dash let out a particularly loud, long, and intense moan; her whole body continued to shake as the familiar sound of her urine trickling against the diaper filled the air, quickly followed by her body being racked by an incredible orgasm…

	…or, at least, it would’ve been, had Twilight not acted so quickly. 

	The alicorn stepped off of the chair, smiling sinisterly, her horn glowing as Rainbow continued to pee herself. She squirmed and shook, her face one of discomfort and dissatisfaction. “I-I’m so close… urgh… w-why won’t it happen!?” Rainbow complained. 

	“Sorry, Dashie, but I told you what was going to happen if you peed yourself~ No finishing for poor Dashie today~” Twilight’s magic was a complicated thing; this spell affected Rainbow’s insides, not making anything physical, rather just wrapping around her nerves in a way that completely prevented her from finishing her orgasm. Although, the sensation of being right on the edge remained; the pegasus kept squirming, trying to let it out, but her body just wouldn’t do it… until finally, the feeling subsided, leaving her with nothing but a vague ache from the unfinished task. As well as the warm and wet sensation of her full diaper, of course… 

	…and, as if things weren’t bad enough, before she knew it, she was feeling pressure in her backside… and the yellow diaper soon turned to a newer, much darker shade, as Rainbow groaned in dismay. “Oh Celestia…” she whimpered, turning her head away and keeping her eyes shut tight out of humiliation.

	“Hmm… I think that spell still has a few kinks to work out. I didn’t realize it would affect your bowels so much~” Twilight chuckled, her horn glowing, the ropes removing themselves. Rainbow’s feeling of being right on the edge had somewhat subsided, but she was still left extremely horny and needy. 

	“Twilight…” She gulped; she couldn’t believe the words that were about to come out of her mouth. “P-please let me finish… I-I’m so close…” 

“Sorry, Dashie, but that’s not happening~ As long as I’m still punishing you, I’ll make the decisions on what you are and aren’t allowed to do~ Maybe I’ll let you try again in a few days~” She smirked. “As for myself, well…” She grabbed Rainbow Dash’s leash and pulled her to the ground; the pegasus landed on her hooves, not necessarily falling. Twilight immediately put a hoof on Rainbow’s head and pushed her down again, as she had before… but this time, she moved her other hoof to her slit, stimulating and touching herself. In only seconds, she orgasmed, her whole body shivering and shaking; Rainbow could feel every little quiver through her hoof, planted so firmly on the pegasus’ head. The diapered mare couldn’t help but watch as Twilight covered her own hoof in marecum, huffing and panting afterward, showing that she’d clearly enjoyed herself quite a lot. “Oh, that was amazing~ It felt so good~ I’ve been holding that in all day - playing with you makes me so horny~” She giggled. 

“Twilight…” Rainbow blushed; honestly, she’d enjoyed that show more than she’d imagined, being practically forced to watch due to her face’s position… but more than anything, it rubbed in that she still couldn’t orgasm herself. She sneakily moved a hoof to her own slit and rubbed her own clit, and even though it stimulated her at first, she could feel the blockage from Twilight’s spell; she could pleasure herself all she wanted, but there would be nothing but disappointment waiting at the end of it.

	“Aww~ I was right - you are adorable like this~ I usually don’t like to see my friends upset, but when I’m the one in control, it just makes you so cute~” Twilight nuzzled her head against Rainbow’s in a cuddly, loving way. “Come on - into the bathroom. Let’s clean you up one more time… and then, we’ll go to sleep~”

	Rainbow sighed; this was apparently going to happen a lot. “Yes, Twilight…” she said, resigned…

	…though, her time with Twilight that night wasn’t going to be nearly as bad as she was expecting, considering what’d happened the previous day. 

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