Rainbow's Foalish Fantasy

by The Abyss

Rating: mature
Tags: My Little Pony: Friendship is Magic, Rainbow Dash, Romance, Slice of Life, Twilight Sparkle
Length: 12488

TwiDash ageplay that goes bad- Feeling secure enough in her relationship with Twilight to divulge one of her deeper secrets, Rainbow takes a risk and tells her that she's an adult foal, and that she wants Twilight to take care of her for a night.

Feeling secure enough in her relationship with Twilight to divulge one of her deepest secrets, Rainbow takes a risk and tells her that she's an adult foal, and that she wants Twilight to take care of her for a night. Twilight agrees, but when she miscalculates the strength of one of her spells, Rainbow gets a whole lot more than she bargained for.

Old Editors: Jake The Army Guy and Cerulean Starlight

Contains: Motherly Twilight, Cute Dashie, Age Play, Breastfeeding, and Light Diaper Usage

Published 2013-12-29 22:40:02 UTC
Last updated 2015-09-29 01:00:07 UTC

The Beginning of Something New

Twilight and Rainbow were snuggling together on a large pile of cushions as they read a book that lay between them. It was already late at night, and they were lying next to a roaring fire, letting its warmth keep the winter cold at bay.

During their budding relationship, Rainbow had come to trust her marefriend implicitly. She had never known a special somepony as loving and understanding as Twilight before, and she absolutely loved that about her. Even though they told each other everything, there was still something that Rainbow had kept secret from her marefriend. She had always been hesitant to talk to Twilight about this particular fantasy of hers, but she now felt that hiding this part of her was wrong; her marefriend had a right to know what she was getting into.

“Twilight?” Rainbow softly asked as she closed the book, breaking Twilight’s concentration. “I… I have something to tell you, so just please hear me out...”

“Of course, Rainbow. What is it?” Twilight asked curiously as she gave her a reassuring nuzzle just under her cheek. She could tell that something heavy was on Rainbow’s mind just from the tone of her voice.

“There’s something I’ve kept secret from you, and I… I think you should know. I don’t want to hide this part of me anymore.” Rainbow looked at the fire as she took a deep breath, trying to calm her racing nerves.

“Umm, okay… What do you mean?”

“I want to… would it be okay if we...” She gulped, still a little hesitant to expose this side of her. While many others might have thought that this idea was on the stranger side of things, she still really wanted to try it out with somepony other than herself. “Umm...try something new?”

“Something new?” That caught Twilight’s attention. Her ears perked up attentively, genuinely interested in what she had to say. “What did you have in mind?”

“It’s, umm… Hehe, I–” Rainbow stuttered nervously. She had planned it all out so perfectly in her head, but now that she was actually about to admit her secret, she found herself at a loss for words. Rubbing the back of her head with a hoof, she giggled in nervous excitement as she glanced about the room, trying to put off the part where she would actually spill the beans.

Steeling her resolve, she took a deep breath and let it slowly. After telling Twilight that she wanted to try something new with her, she knew that she couldn’t back out now. Yes, she could make up a lie and try to weasel her way out of exposing her secret, but she could not, and would not, lie to her marefriend. If there was one thing she knew about relationships, it was that trust was the most important part. With that thought in mind, she looked Twilight dead in the eyes and said, albeit a little nervously, “I want to pretend I’m a foal, and have– have you take care of me.”

Twilight was taken aback, and she knew that she had to tread carefully. “Oh… umm, okay...” she said in what she hoped was a neutral voice, but it came out in a very negative manner.

Rainbow nodded silently, closing her eyes out of sheer nervousness as her body started to pump adrenaline through her veins. She had put herself out there, and now she was wondering if that had been such a good idea. As the silence crept on longer and longer, her nervousness grew. She didn’t dare look at Twilight, for fear of what her reaction might be.

Nearly a minute passed in silence before Rainbow came to a decision. “Look, I don’t know what you think of me now, but I’m just gonna get outta here.” She stood up to leave and ruffled her wings, preparing to fly back to her cloudhouse. “I understand if you don’t want to be my… my special somepony anymore…” she choked out as she cast her gaze off to the side, staring at the floor.

With a sudden flourish of her wings, Twilight quickly flew to Rainbow’s side. She pulled her into a tight hug and softly said, “Don’t you ever say things like that again, Rainbow… I don’t know what I’d do without you...”

Now it was Rainbow’s turn to be taken aback. She had expected Twilight to be nervous, maybe even a little freaked out, but certainly not all cool and accepting like she was now. She glanced up, letting a small, nervous smile pull her lips upward as her eyes connected with her marefriend’s. Twilight’s gaze was not one of incredulousness, but one of love and compassion, definitely not what she was expecting to see.

“Now, come on. Let’s go back to the cushions, and you can tell me all about this new and special side of you, alright?” Twilight asked in a soothing voice, making Rainbow feel a little bit more secure.

“O– Okay…”

They quietly walked back towards the cushions and sat back down. Still a little nervous, Rainbow started, “Well, umm… It’s just something that’s always been with me since I was little, ya know? Sometimes I like to, umm... act like a foal because it gives me a release from the world, letting me pretend like I don’t have any adult responsibilities.”

“Ahhh... okay, I think I see what you mean. So, you like the innocence that being a foal presents?”

Rainbow looked at Twilight suspiciously; that was exactly what she was trying to say. “Uh, yeah… yeah, pretty much.”

“Okay. So, umm… You know...do you, umm… Do you like to go all the way with it?”

“What do you mean, ‘all the way’?” Rainbow asked a little defensively. She couldn’t help it, but she still felt slightly wary about talking openly about her fetish, even if it was to the mare that she trusted the most. She shifted into a more comfortable position on the cushion and glanced back up at Twilight, waiting for her to respond.

“Well, to be blunt, do you wear diapers and, well… use them? Play around with foal toys? You know, those sorts of things?” Twilight asked nonchalantly. “To be honest, I know that there are two sides of this particular fetish: a diaper lover and an adult foal. I’m just curious to see which you are.”

“Well, uhh...yeah. I’m an… umm… adult foal.” Rainbow said in a soft voice. She cast her gaze to the side shamefully as she spoke, only to have Twilight’s hoof guide her to face her again.

“Rainbow, that’s nothing to be ashamed about.”

“Wha… what?” Rainbow met her marefriend’s gaze, relieved that she thought that way. “It’s not?”

“Of course not! And also, I think it’d be pretty fun to treat you like my foal for a day.”

“Wait, you actually want to treat me like a foal? You don’t think it’s weird?”

“Not at all! We all have our kinks, and being an adult foal is part of who you are, and I love you; nothing’s ever going to change that. I love you for who you are as a mare, and not just because you look dashingly stunning.” She giggled at her little pun, giving Rainbow a playful boop on the nose with a hoof. “Sorry, I couldn’t help myself,” she said as the two of them started laughing together.

Calming down a few moments later, Rainbow continued in a more serious tone, “Twilight, listen... if we’re gonna do this, I want to go all the way, and… there’s… there’s another thing.”

“Oh?”

“Can you… um… I’d like to try, if it’s possible…” She gulped loudly before continuing, nervous from what she was about to ask. ”breastfeeding, from you.”

“Well, uhh... I’m sure that there’s a spell in here somewhere that can help us with that,” Twilight replied with a small chuckle, glancing about the library as she thought of where she could find such a book. “That really shouldn’t be an issue, and I think it would add to the realism for you.”

“R–Really? You’d do that for me? For real?”

“Of course! If we’re going to do this, we’re going to do this the right way!” Twilight said reassuringly as she laid a wing over her trembling marefriend. Trying to calm her down, she pulled her closer and nuzzled her affectionately, all while rubbing her back with her wing. “And believe me, I want to do this for you; it’ll be fun!”

Feeling a bit tired, she levitated a thick blanket over them, letting loose a small yawn. Settling the blanket down on top of them, she continued, “Tell you what: while you take care of your weather duties tomorrow, I’ll use that time to get things ready for my new little foal.” She gave Rainbow a small nuzzle just under her neck, making her giggle slightly. “And once you finish your duties, you can bring all of your supplies over here around six, and you can spend the night with me as my new foal. That sound good?”

“That sounds great, Twi…” Snuggling closer to her, Rainbow gave her a loving kiss on the cheek. Closing her eyes to fall asleep, she couldn’t wait for tomorrow, giddy that she was finally going to live out one of her deepest fantasies.

Twilight's New Foal

It was finally nearing the time that Rainbow was going to come over. Twilight had just finished preparations for their special night together, and thankfully Spike was attending a sleepover with the Cutie Mark Crusaders. She wasn’t sure why, but he’d been quite eager to spend as much time with Sweetie Belle as he could these past few weeks. It made her wonder when she’d have to give him the birds and the bees talk, and about what growing up meant. But all that was for another time. Happy that everything was perfectly in place, all she had to do was wait for her marefriend’s arrival.

She glanced at the clock hanging on the wall. 5:45? Well, it seems that I have a little bit before Rainbow comes over… She was just about to go downstairs to the basement to make sure everything was in place for the night’s activities when she heard a few soft knocks on the door. Trotting the short distance over to the door, Twilight pulled it open with her magic, revealing Rainbow standing just outside with the sun shining right behind her as it set over the horizon.

“Hey, Twi! How’s my favorite mare doin’?” Rainbow trotted inside happily, giving Twilight a quick peck on the lips in the process. Feeling the cold winter air start to rush in, Twilight quickly shut the door behind them. She flipped the sign in the window to ‘Closed’ and locked the door behind them, ensuring them privacy for the rest of the night.

“Good, Rainbow! I’m glad you’re finally over; I couldn’t stop thinking about you and our little… event all day!” Twilight exclaimed as she pulled Rainbow into a brief hug. She pulled away in shock moments later, surprised that Rainbow’s coat was absolutely frigid. “Rainbow, you’re freezing! Why didn’t you wear anything? I don’t want my little foal to catch a cold!” A small shiver of excitement ran down Rainbow’s spine as Twilight called her a foal; it seemed like they were going to just jump right in!

Rainbow looked up to meet Twilight’s gaze just as she felt her saddlebag rise up off her back, pulled away by her marefriend’s magic. Holding the cold bag in her magical grip, Twilight quickly slung a blanket over her marefriend’s back in an effort to warm the pegasus up. Laying a wing over Rainbow’s shoulder, she gently said, “Alright, Dashie, Mama’s got your bedroom all set up downstairs… Wanna go see it?”

Rainbow’s eyes lit up just like a foal’s would on the morning of Hearth’s Warming Day. She nodded eagerly, and with a smile, she let Twilight lead her towards the basement door. Rainbow couldn’t wait to see what her new bedroom looked like, and she was giddy with untold anticipation. Twilight quickly pulled the door open with her magic and was surprised to see Rainbow try to bolt forward. Thinking quickly, she grabbed her tail with her magic and gave it a gentle tug, stopping her in her tracks.

“Ah ah ah, Dashie. It’s not safe running in the dark; you could hurt yourself!” Twilight scolded her foal.

“I’m sowwy, Mama, I just wanna see my new room, is all,” Rainbow said apologetically. She lowered her head and picked at the ground with a hoof.

“That’s quite alright, Dashie. Now come on, let’s go see your new room,” Twilight said as she walked down the first few steps, flicking on the lights a moment later. Looking back, she smiled warmly and held her wing open, motioning for Rainbow to follow her.

With wide eyes, Rainbow followed Twilight down the steps. What used to be the basement was now a full-blown nursery. There were several comfy-looking cushions where foal-themed blankets and stuffed animals lay in one corner, and there was even a little playpen, complete with blocks and a few other small toys. There was an adult-sized padded changing table, stocked with all sorts of powders and creams, and of course, extra diapers.

The nice wood floor was now completely covered by white, fluffy carpet, and the walls were painted a soft, foalish blue, just like the sky. Twilight had even gone the extra mile, painting little clouds all along the walls, making it feel like they were living in the clouds, exactly where a pegasus foal would be raised.

Rainbow squeed in excitement; this was more than she could have ever imagined.

“Well? What does my little foal think of her new room?” Twilight asked gently, smiling as Rainbow gave her a tight hug.

“Mama, this is so awesome!” Rainbow said happily as her head darted back and forth across the room, trying to take everything in all at once.

“I’m so glad you like it, Rainbow,” Twilight said, breaking character. “Now, before we get into the full swing of things, there are some things that we need to go over.” She motioned for them to lie down on the cushions on the other side of the room, setting Rainbow’s bulging saddlebag of supplies on a nearby table.

After making herself comfortable, she waited for her marefriend to do the same as she lay down next to her. “So, what sort of supplies did you bring over for tonight?” she asked, nodding towards Rainbow’s saddlebag.

“Oh, I just brought my pacifier and four of my own diapers; I wasn’t sure if you’d get any or not,” Rainbow said as she looked around the room, smiling at all the changes. “These ones are extra special though, Twi. They can take several small wettings or two big ones, and they’re fitted for adults.”

“Alright. So I remember you said that you wanted to go all the way with this. Besides wearing diapers, what else did you have in mind?” She asked as she cocked her head to the side. “I want to hear what you want, and then I have some things to suggest.” Her ears pointed forward, she waited patiently for Rainbow to begin.

“Well, umm… I’d like to be treated like a foal; you already know that. You’re doin’ a great job so far, by the way. So if it’s still okay with you, I’d love to, umm… eheheheh, breastfeed from you, just like a foal would.” Rainbow glanced up at Twilight nervously, hoping that she wouldn’t back out.

“Of course, Rainbow. Oh, and while you were away working, I did some research earlier and I found some spells that can make this whole experience for you a lot more… interesting, to say the least.”

“Interesting, eh? Go on,” Rainbow prompted with a grin, her wings bristling in excitement.

“Well, the first spell would make me grow breast tissue and lactate, which is what you wanted. It’s pretty complicated, and it takes a little bit of time for the tissue to form,” Twilight said casually, making her marefriend’s eyes widen. She couldn’t help but feel a little excited about all of this. Not only was she going to be spending a night in with her beautiful, loving marefriend, she was going to be trying something completely new and different with her.

Shifting positions to make herself more comfortable, she continued. “The second spell that I have in mind would add more to the realism of you being a foal. If you want me to cast it, drinking my milk will make you lose complete control of your bladder. You won’t lose complete control at first; you’ll lose more and more control as time goes on until you won’t even feel yourself going.”

She cast her gaze to the side as she prepared herself to tell Rainbow the bad part. “The only thing is that I’m not sure how long you’ll be incontinent. It all depends on how much you drink, so just to be safe, I’m going to have you wear a diaper all through the night and through tomorrow morning. Is that okay with you?”

Rainbow smiled. “Yeah, Twi, that sounds fine to me!” She chuckled for a couple moments before saying, “And how’s that a bad thing? That’s perfect!”

Twilight was shocked for just a moment. She had thought that the pegasus would have been at least a little nervous about that part, but seeing that she wasn’t fazed in the slightest, she continued. “Alrighty then! The last two spells are not as hard, but are equally complex. To help with the realism of you being a foal, I found a way to temporarily hide your cutie marks, and I can make you speak with the same level of intelligence as a foal. Your words will slur just like you were doing intentionally a minute ago, and even if you try to speak clearly, you will still speak like a foal would. Do keep in mind, though, that you will still be able to think like an adult, much like you are now.”

“Twi… That sounds perfect…” Rainbow said breathlessly. Her entire body trembled in giddy excitement; she had never been able to take her fantasy so far by herself before. Being able to completely lose control of her bladder was something that had been on her mind for the past several months, and seeing that Twilight could actually help her reach that goal of hers, if only for a few hours, was an absolute blessing.

“...But there’s a side effect to the spell, and I’m not sure if you’d like it or not. The thing is, if I cast this spell on you, all of your basic motor skills would be greatly diminished. You won’t be able to fly around, and–” Twilight was cut off when Rainbow suddenly spoke up.

“Wait, I won’t be able to fly?” Rainbow asked nervously, her voice dripping with fear. “This is all temporary, right?”

“Yes, Rainbow. I promise to you that you’ll be able to fly normally when that spell wears off,” Twilight said reassuringly, staring Rainbow right in the eyes. “You have nothing to worry about, and besides, Mama Twilight is gonna take good care of her cute little foal.”

“Well…” Rainbow said as she made up her mind. “So long as none of the effects of the spells are permanent, then I say we go for it.”

“Oh, and one more thing,” Twilight added as she smiled gently. “After I cast all of the spells, I’m not going to be calling you by your name anymore. Rainbow Dash is no name for a foal, and I think Dashie sounds much more fitting. That fine with you?” Twilight asked, getting a silent nod from her marefriend a moment later.

“Okay! Let’s get started, shall we?” Twilight asked, smiling as she pulled a certain spell book out from under the cushions. She flipped it open to the first of the four bookmarks and reread the spell on the page one more time, just to make sure that she knew it. Altering somepony’s body took a great deal of concentration, and there could be some serious repercussions if something went awry.

Instead of completely changing her appearance like some spells would, all she had to do with this spell was stimulate her body in just the right area to make it think that she had just given birth, causing her to lactate. She wasn’t quite sure how it would feel to have her teats sucked on, but she’d read that the feeling could be quite pleasurable, so long as she wasn’t bitten.

Setting the book down on the cushion before her, she lay on her side and shifted her legs, exposing her small, pink teats. Closing her eyes, she concentrated, letting the magic flow through her horn. As Rainbow watched in silent and rapt attention, a small stream of her magic flowed out of the tip of her horn, weaving its way through the air to her teats. Mere seconds later, the flow of magic reached the exposed, pink nubs and surrounded them before sinking into her flesh, disappearing completely.

As the spell started to do its job, Twilight grunted, alarming Rainbow.

“Hey, you okay?” Rainbow asked in concern, laying her hoof on Twilight’s.

“Yeah, I’m fine. I just feel a bit sensitive down there, is all.” Twilight lifted one of her hind legs and looked down, inspecting her teats. As she watched, both the small nubs and the breast tissue underneath started to grow slowly, tingling all the while.

“Is it… are they ready yet?” Rainbow asked hesitantly as she bent down to inspect the slowly growing orbs. She licked her lips, desperately hoping that the answer was yes.

“No, Rainbow. They’ll take at least ten minutes to form. The book said that it all depends on the age of the mare and whether or not she’s given birth, so seeing that I’m still young and haven’t had any foals yet, they should be fully formed in no time at all.”

Picking up the spell book once more, she flipped to the next bookmark. Like before, she read the spell once more and then placed the book back down. Concentrating again, she lit her horn as she wove the spell in her mind. Instead of a small purple stream like before, her magic appeared on her slowly-growing breasts before disappearing a moment later.

“Was that the… ya know…”

“The spell that’ll make you become incontinent when you nurse from me? Mhm...” Twilight stated, moments before her face slightly contorted in a grimace as her teats started to feel a bit uncomfortable. It felt as if someone was poking them with a small stick, but she ignored the feeling, assuming that it was just a part of either of the two spells. Picking up the spell book again, she flipped to the next bookmark.

“Alright, Rainbow, this next spell will hide your cutie marks, making it look as if you never got them. I can assure you that it is quite painless, and the process only takes seconds. You ready?” After Rainbow gave a couple quick nods, Twilight effortlessly wove the spell in her mind and then released it, directing her magic towards her marefriend’s flanks. As her purple aura surrounded Rainbow’s cutie marks, both the magic and the cutie marks started to glow brighter and brighter.

Releasing the spell, she was hit with a sudden bout of weariness, and she opened her eyes just in time to see the bright light reach its peak before suddenly dissipating with a flash, leaving Rainbow’s flanks completely smooth and blank.

Hoping that the last spell wouldn’t leave her completely worn out for the night’s activities, she raised the book before her for the last time and flipped to the last bookmark. Like the other three spells before it, she read it over quickly and closed the book, placing it back under the cushions.

“Alright, Rainbow, you ready?” Twilight asked as she panted a couple times. Casting such complex spells in quick succession always left her in a state of exhaustion; she hoped that the next one wouldn’t put too much of a strain on her body.

“As ready as I’ll ever be, Twi!”

“Okay. Just to be on the safe side, I want you to lie down on your side, alright? When I cast this spell, your muscles will become a lot weaker, and you won’t be able to support yourself.“ As Rainbow silently complied, Twilight lit her horn and cast the spell. This time, instead of a small stream flowing from her horn, her magical aura gradually appeared around Rainbow’s still body, disappearing a few moments later.

As Twilight released the spell, she nearly collapsed on the cushion as a fit of weariness washed over her. Panting, she took several deep breaths as she looked up, her gaze settling on her marefriend. “Rai… Rainbow, did it work? Say something, anything.”

“Twiright!” Rainbow exclaimed as she rolled over onto her belly. She tried to stand up to check on her, but fell back down a second later; her limbs were much too weak to support her weight.

“Yay, it worked!” Twilight said happily as she sat up, feeling her head throb slightly from her efforts. Her flank started to feel a little sore from sitting in the same place for so long, so she shifted her hind legs, putting undue pressure on her now highly-sensitive teats. Biting back a slight gasp, she lifted one of her hind legs and peered down. Her erect teats were now plump mounds, no doubt filled with her milk. Using a hoof, she gently rubbed her teats, starting to enjoy the new sensations that they were providing.

A few moments later, Twilight heard a small whimper come from somepony, and she knew just who it was: her new foal. Looking up with a caring smile, she found Rainbow with her head lying flat on the cushions as she stared up at her. Her tail was flicking from side to side playfully, and her eyes darted back and forth between Twilight’s face and her newly-formed teats. Letting loose another soft whimper, Rainbow looked up at Twilight with pleading eyes, licking her lips hungrily every few seconds.

“Aww, is my little Dashie hungwy?” Twilight asked in a soothing voice as she slowly cocked her head to the side.

“Dashie is uh foal’s name!” Rainbow said in the high-pitched, indignant voice of a young filly. Her face taking on a look of shock and wonderment, she shook her head a few times and continued, trying to speak normally. “I’m no ah foaw!”

“No, Dashie, you are a foal… my own precious, little foal,” Twilight said softly as she gave her new foal a gentle nuzzle on the cheek, eliciting a soft, happy hum from her.

Pulling back a few moments later, Twilight lit her horn, pulling Dashie’s saddlebag towards them. After laying the stuffed bag in front of her, she undid the latch and carefully pulled out its contents. Arranging them before her, she analyzed what she had at her disposal.

The first things she held up to inspect were the thick, white, plastic-backed diapers. As she held them, a small idea popped into her mind, and she lit her horn for just a brief moment as she focused her magic on the four diapers. A couple moments later, her own cutie mark slowly faded into view on the front of each diaper. With a small smile, Twilight sat them down out of Dashie’s sight and moved on to the other item.

A pacifier, one large enough for a full-grown mare. It was a soft blue color, only a few shades away from Dashie’s coat. Looking up, she noticed that Dashie was still whining and licking her lips hungrily, so with a smile, she gently pushed the pacifier into her mouth with her magic. A moment later, Dashie closed her eyes and started suckling away at it.

Seeing that her foal was occupied for the moment, Twilight grabbed one of the diapers that she had just put her cutie mark on. Laying it on her forelegs, Twilight said, “Alright, Dashie, Mama’s gotta put one of these on you; we wouldn’t want you to have another one of your accidents, now would we?”

“But mama, Imma big filly! Ah don’t need diaper!” Dashie protested as she spit out the pacifier, trying to crawl away.

“Ah ah ah,” Twilight gently said as she stood up and sat down in front of her foal, blocking her path. Grabbing the pacifier in her hoof, she gently pushed it back into Dashie’s mouth, and she gently levitated her into the air.

Walking the few short steps to cross the room, she placed her on the changing table and said, “Now, be a good little filly and don’t move, okay? Mama will be back in a couple seconds.” Twilight turned around and looked back towards the cushions. Using her magic, she grabbed one of the diapers that Dashie had brought and grabbed a bottle of foal powder.

Turning back around to face the changing table, Twilight placed the diaper down and moved down to Dashie’s nether regions. She twisted open the cap on the foal powder and coated Dashie’s privates with a good amount of the white powder, making sure that she wouldn’t get a diaper rash. Setting the bottle down, she grabbed the diaper and opened it. After sprinkling a little extra of the foal powder inside for good measure, she gently lifted Dashie’s flank with a hoof and slid the back end of the diaper under her, positioning it just right. Seeing that one of the wings of the diaper had folded back down, Twilight pulled it back out with a touch of her magic.

Letting Dashie’s rear sink onto the soft, crinkly diaper, Twilight pulled her prismatic tail through the hole in the back and pulled the front of it up around her waist. She taped the diaper up and made sure that it was a snug fit, tugging at the waistband. Satisfied that she had done a good job, she was just about to ask if her foal wanted to go play when she heard her stomach grumble loudly.

“Aww, is my wittle foal hungwy?” Twilight asked. “Come on, Mama’s got a wittle treat for you…” Picking Dashie back up in her magical grip, she went back to the cushions and lay back down, setting Dashie down gently next to her hind legs. Rolling onto her side, she exposed her swollen mounds and erect, twitching teats to her new foal. “Now remember, Dashie, be gentle… You don’t wanna hurt Mama, right?” Rainbow’s only response was a nod of her head as she slowly crawled forward towards Twilight’s waiting teats.

This was the moment that she had been waiting for. As her hot breath teased her mother’s waiting orbs, she glanced up at her, silently asking for permission to go ahead. With a gentle smile, Twilight nodded, giving her consent, and that was all Dashie needed.

Latching her lips around the bottom teat, Rainbow started sucking as hard as she could, trying to start the flow of milk. Trying to coax out the milk faster, she gently bit down on the teat in her mouth, making Twilight gasp in pain. Looking down, Twilight gently scolded her foal, “Dashie, be gentle! That hurt...”

Feeling a bit sorry for causing her pain, Dashie slowed her sucking and made sure to not let her teeth go anywhere near the teat. Settling into a steady suckling rhythm, she finally got a few small drops. Eager for more, she kept on sucking, and she was rewarded by a small but steady stream of Twilight’s milk. The soothing rhythm of sucking at Twilight’s teat combined with the warmth of the milk made her feel a little sleepy, so she closed her eyes as she sucked away.

Twilight watched her foal suckle away at her teats for the next couple of minutes. It was hard to describe the sensations she was feeling right now. It felt as if somepony was tugging at her teat almost to the point that it would be painful, but at the same time, it was oh so pleasing. Just a moment later, Dashie released the first teat from her mouth and moved to the other one. Gently pulling it into her mouth, she resumed her sucking, smiling softly as the milk started flowing into her mouth and down into her stomach.

Laying her head down on a cushion, Twilight closed her eyes as she let Dashie have her fill. She wasn’t sure how long it would take, but she would give her foal all the time she needed.

A couple minutes later, Dashie pulled away with a loud yawn, pulling Twilight from her thoughts. Lowering her leg back down, Twilight sat up with a gentle smile and asked, “Is my wittle Dashie full?”

“Mhm…” Dashie replied as she crawled over to lie next to Twilight. Lying on her back, she snuggled up close against the alicorn’s side and sighed happily, closing her eyes as Twilight gently brushed her mane out of her eyes with a hoof. Snuggling closer to her, she smiled as Twilight put the pacifier in her mouth, and she started sucking away at it, enjoying the soothing sensations that came with it.

Dashie lay beside Twilight for a minute, enjoying the warmth from her coat. Her stomach was full of Twilight’s warm breast milk and even if she tried, she wouldn’t have been able to drink any more. She felt her stomach twinge slightly as it started to digest the fluid and she started to feel a little pressure building up in her bladder, signalling that she would have to go to the bathroom soon. I’m big filly; I can hold it! she thought defiantly. I can show Twilight that I don’t need this diaper!

As she clenched her hind legs together to try and hold it in, she suddenly felt something soft run along her tummy. Quickly opening her eyes, she spotted a stuffed animal, a white bunny rabbit to be exact. She glanced up into Twilight’s eyes, instantly figuring out her little game. She was trying to make her forget about the building pressure in her bladder so that she’d wet herself!

As the pressure grew greater and greater, Dashie groaned and sat up, sitting on her padded rear. She placed her two front hooves in between her hind legs, pressing against the diaper, trying to hold it all in. “Nnnn… Mama, ah gotta go potty!” she said nervously after she spit out the pacifier.

Seeing that Dashie was in distress, Twilight got up and sat down next to her, giving her a reassuring nuzzle on her head. She wrapped a warm, comforting wing around her and gently said, “Shh… It’s okay, Dashie… just let go; that’s what the diaper is for...”

“Nnn… but– but I–” she was cut off when Twilight suddenly stuck the pacifier back in her mouth. She tried to spit it back out so she could speak, but Twilight held it there. Giving up, she started sucking on it, and only then did Twilight let her hoof drop.

With a sly grin, Twilight unfolded her other wing and slowly moved the tip of it to one of Dashie’s exposed hind hooves. Picking the right one, she softly tickled the base of it with her wingtip, making her foal squeal in surprise.

“Mama, stahp!” Dashie complained around the pacifier as her legs trembled; it was all becoming too much. She couldn’t help it, but she felt a little bit slip out of her, quickly absorbed by the diaper. “I… I…” And with that, she lost complete control as the pressure became too much for her to handle. As she let go, she latched onto Twilight’s leg and buried her face into her shoulder, ashamed that she couldn’t prove that she was a big filly.

Hearing a faint hiss coming from Dashie’s diaper, Twilight knew that she’d begun wetting herself. “There, there, Dashie… Mama’s here…” She rubbed her foal’s back with a wing as she continued to wet herself uncontrollably. She continued to rub Dashie’s back for about twenty more seconds as the faint hissing continued, and then it faded away.

“All better?” Twilight asked gently, giving her foal a reassuring nuzzle on the cheek as she nodded silently. “Dashie wanna play with Mr. Bunny Wabbit?” She raised the stuffed animal and held it before her, who snatched it from the air and held it close to her chest, snuggling with it.

Using a hoof, Twilight gently patted Dashie’s thick diaper and realized that she needed a change. Standing up, she nuzzled her foal just behind her ears and ruffled her mane playfully before saying, “Come on now, let’s go get you into a fresh diaper, okay?”

“But Mama, ah wanna play wif Mr. Bunny Wabbit!” Dashie exclaimed, spitting the pacifier out. Holding the stuffed animal to her chest, she said, “He so soft and cuddlewy!”

“He can come along, too,” Twilight said as she levitated her into the air.

As she was gently placed on the changing table a moment later, Dashie curled her forelegs up to her chest as she snuggled with the stuffed animal. A few seconds later, she looked up, trying to see where Twilight went, and she finally noticed that Twilight’s cutie mark was on the front of her diaper. “Mama, you cutie mahk!” She pointed down at her diaper, smiling happily as Twilight trotted up to her, holding a fresh diaper in the air.

“Yes, Dashie, that is my cutie mark! It’s there so everypony can see that you’re my cute little foal, and not somepony else’s,” she said as she laid the fresh diaper down beside her foal. Undoing the four tapes holding the diaper together, she gently peeled away the front of the diaper, laying it stretched out on the changing table. Lifting her foal’s rear with a hoof, she used her magic to pull the used diaper out from under her and she balled it up, throwing it away in the trash can that she had conveniently located right next to them.

Grabbing a box of wet wipes, she pulled one out and quickly wiped her foal’s privates, taking care to not miss a spot. She placed the used wipes in the trashcan and after powdering her foal, she grabbed the diaper and opened it.

“Alright, Dashie, almost done…” Twilight murmured as she lifted her foal’s rear with a hoof, sliding the new diaper underneath her. Letting loose a soft yawn, she threaded Dashie’s tail through the hole in the back and brought the front of the diaper up. Tugging the plastic wings down, she made sure that it was a snug fit, and then she taped it up. Like before, she used a hoof to test the waistband, making sure that it wouldn’t slide off on its own.

As she sat up to inspect her new diaper, specifically where Twilight’s cutie mark was, Dashie couldn’t help but let loose a yawn, even bigger than Twilight’s. Feeling Twilight’s magic pick her up into the air, she smiled as she was slowly levitated through the air and back to the cushions.

As she was laid down on the cushions, she let go of Mr. Bunny Wabbit for a second as she crawled over to the pile of blankets. Her head darting back and forth, she picked out a pure white blanket with frilly light blue lace around the border. Grabbing it in her teeth, she dragged it back towards her stuffed animal and let go of it. Crouching, she playfully pounced on the stuffed animal, pulling it towards her chest in another hug.

Twilight lay down next to her, carefully unfolding the blanket with her magic. “It’s getting pretty late, Dashie…” She trailed off as she gave another yawn. As she finished, she glanced down at her foal and noticed that she too was yawning, no doubt caused by hers. With a small giggle, Twilight laid the blanket over the two of them and pulled her close with a wing.

Laying her head down on another cushion, Twilight closed her eyes, exhausted from both the spells and the night’s activities. She hoped that her foal would be tired as well, but Dashie had other plans.

In preparation for tonight, Dashie hadn’t eaten anything throughout the entire day, leaving her with a very empty stomach. The milk from earlier had sated that hunger, but now it was back full force. Whining ever so softly, she slipped out from under Twilight’s wing and turned around, while still staying under the blanket. Nearing Twilight’s hindquarters, she nudged her flank with her muzzle as hard as she could, which really didn’t amount to much because of her weakened foalish state.

Twilight groaned; she wanted nothing more than to fall asleep, and now it seemed her foal was hungry. As she felt another insistent nudge on her flank, she knew that Dashie wouldn’t stop bugging her until she got some milk. With that thought in mind, she rolled onto her side and shifted her left hind leg, allowing Dashie access to her teats.

With a small cry of happiness, Dashie slid forward and wrapped her lips around the bottom teat. Remembering to keep her teeth away from the sensitive nub, she started sucking softly, increasing the pressure until she got a few drops of Twilight’s warm milk. Suckling just a bit harder, she was able to get a small flow of the liquid as she settled into a steady rhythm.

A brief minute later, the stream ran dry, and after trying for several seconds to see if there was anything left, Dashie let go. Licking her lips, she was about to go for the other teat, but Twilight rolled back over onto her stomach, blocking her from doing so. Twilight pulled the blanket off them, and as the warmth was swept away, she quickly snuggled up to the alicorn.

“Come on, Dashie… You wanna go play with some toys?” Twilight asked softly as she stood up, trying to fight back a yawn. Lighting her horn, she gently lifted Dashie into the air. As she placed her foal in the playpen, Dashie put her forehooves against the wall and stared pitifully up at her, pouting.

“Oh, what’s wrong?” Twilight asked in a caring tone. “Does my wittle Dashie need a change?” She leaned over the short wall of the playpen and patted her thick diaper with a hoof, noticing that she was still dry. If that’s not the problem, then what is? As Dashie started whimpering and tearing up, Twilight saw that she was staring right at her dropped stuffed animal that was lying on the cushions.

Quickly picking it up, Twilight dusted it off and held it up for Dashie to see. “Is this what my wittle foal wanted?” she asked, smiling as Dashie’s eyes lit up joyfully. Lowering it down to her level, she let her foal snatch it from the air, and she couldn’t help but smile as she watched Dashie hug it. “Say, why don’t you and Mr. Bunny Wabbit play with those blocks? See if you can stack them!” Twilight sat down as she patiently watched her foal look around, trying to locate the toys.

A moment later, Dashie found them. With a toothy grin, she crawled over to them, clutching Mr. Bunny Wabbit to her. Settling down onto her padded rear, Dashie flicked her tail from side to side as she looked at the blocks. Each side had a different letter and color on it, mostly pinks, purples, and blues. Picking one up, she placed it on top of another. She continued to stack them as carefully as a foal could, only succeeding in getting four on top of each other. As her tower crumbled, she pouted and crossed her forelegs, pulling her stuffed animal to her chest as she stared at her mess.

As she stared at the blocks, specifically the letters on them, an idea suddenly popped into her head. With a small smile, she rearranged the blocks until they spelled a message. Dashie quickly read it over one more time and then called out, “Mama, wook!” Her smile growing wider and wider, she pointed at the blocks as Twilight got up to see what she had made.

Peering over the little wall that separated them, Twilight peered over her foal's shoulder and read the message that they spelled out. “I… wuv… u...” she read out, the message making sense in her mind an instant later. “Ah! I love you too, Dashie!” She bent down and nuzzled her foal, leaving a gentle kiss on her forehead as she pulled away.

Just as she sat down to let her continue playing, she heard a faint hissing noise emanating from Dashie’s flank. Giggling softly, she hid her smile with a hoof as she watched her foal unknowingly wet herself as she started playing with the blocks again. Dashie stood up, letting the wet diaper sag as she moved to the other side of the playpen, inspecting the other toys. It was only when she sat down did she notice the comforting warmth of a wet diaper.

Looking down in shock, Dashie quickly checked herself by patting the front of the diaper. As her hoof hit the swollen plastic, she realized instantly that she had indeed wet herself. As she poked at her diaper, marveling at how she had become fully incontinent, Twilight trotted around the playpen and lit her horn, once again levitating her into the air. Laying her down on the changing table a moment later, Twilight placed her pacifier in her mouth as she started to change the diaper.

Having changed two diapers in one night, Twilight knew exactly what to do as she changed her foal’s diaper. A brief minute later, Dashie was all padded up and the used diaper was thrown away.

Picking her back up with her magic, Twilight brought the two of them back over to the cushions, and now, unlike before, Dashie couldn’t keep her eyes open. Her ears were pinned back, and yawn after yawn wracked her body as she struggled to stay awake. Laying down on the cushions for the last time that night, she settled Dashie down right beside her. Like before, she pulled her close to her barrel with a wing and levitated the blanket back over them.

As the warmth from her mama and the blanket slowly lulled her to the world of dreams, Dashie stirred as she remembered that Mr. Bunny Wabbit was still in the playpen. Letting loose a soft whimper, she tried to get up to crawl over there, but Twilight was much too strong for her.

Figuring out what was wrong a couple moments later, Twilight didn’t move, instead choosing to use her magic to retrieve the toy. Levitating the stuffed animal towards them, she laid it down right next to her foal, who quickly snuggled with it with a small squee of joy. Twilight smiled softly as she felt Dashie snuggle closer to her, and before the two of them fell asleep, she softly whispered into her foal’s ear, “I love you, Dashie…”

Surprising Changes

Rainbow awoke in the middle of the night, her stuffed animal held securely right up against her chin. She was still suckling away at her pacifier, and she could feel a comforting warmth coming from her rear. Even though her eyes were still closed, she instantly recognized the feeling of a warm, wet diaper. Rainbow smiled as she snuggled closer to Twilight, sincerely grateful that their relationship had gotten to the point where she could reveal her most deepest secret and not be judged for it. That meant the world and more to her, and it made her wonder if Twilight had any fantasies that she’d like to live out. She knew that if she had any, she’d be more than happy to help her, just like what she was doing for her right now.

Dashie rolled over, pressing her back up against Twilight’s side, still staying under her warm wing. One of her hooves brushed against one of Twilight’s breasts, and she frowned, because it felt like they had grown in size. Cracking her eyes open, she gently crawled out from under Twilight’s wing and felt her way along in the dark.

Her snout mere inches away from Twilight’s breasts, Rainbow extended a hoof and carefully prodded it, pulling her hoof back with a surprised squeak. Her mama's orbs were definitely much bigger than earlier, and she licked her lips hungrily as she felt her stomach grumble. Her padded rear wiggling in excitement, Dashie leaned forward and took the first teat into her mouth and started sucking, humming happily as she got the familiar and reassuring taste of Twilight’s milk. This time, the milk tasted a little bit different, a bit sweeter to be exact. She didn't pay it any mind though, for she loved how it tasted now.

It took her four or so minutes until that teat ran dry. Dashie released it and licked her lips, letting out a soft burp a moment later. Rolling onto her side, she took the other teat into her mouth and sucked hard, trying to get the flow started. A few moments passed in silence before she got what she wanted, and it took her about the same time to finish off that teat.

Her stomach now full of Twilight’s warm milk, she slid back under the alicorn’s wing and curled up under it. She pulled the diaper up a little bit just to make sure that it wouldn't slip off in the middle of the night. Dashie checked the tapes and saw that all four were still secure, so she grabbed the pacifier and popped it back into her mouth. She turned around, laying her head near Twilight’s bountiful swollen orbs and smiled as she felt the diaper become just a little warmer as she drifted off to sleep, just like a good little foal would.

Dashie woke up when she felt Twilight stir in her sleep. She could tell it was morning from the amount of light shining through the basement door at the top of the steps, and that gave her just enough light to look around. Everything was as they had left it last night, but it all seemed bigger for some odd reason. She shrugged, chalking it up to the fact that she laying on the ground, looking up at everything. Of course everything’s gonna seem bigger when you look at it from below… Dashie thought as she rolled over, struggling to push Twilight’s wing off of her. She was getting a little too warm, and her stomach grumbled in hunger again. Licking her lips, Dashie noticed that her pacifier was missing. She felt around for it with her forelegs unsuccessfully. Giving up, she tried to push Twilight’s wing off of her like she had done in the middle of the night, but she still couldn’t do so.

It took her a minute to wiggle out from under Twilight’s wing, and she found her muzzle right in front of Twilight’s breasts. She couldn’t believe her eyes. The orbs were noticeably bigger than last night, jiggling with every little twitch from Twilight. Dashie didn’t want to keep her hungry stomach waiting, so she wrapped her lips around the lower teat and started sucking, closing her eyes as the soothing rhythm threatened to lull her back to sleep again. She fought off the feelings though, and when the teat started to run dry, Dashie switched teats, moving to the top one. Much like she had done last night, she repeated the process with that teat and sat back with a full stomach.

Dashie started to feel a little cold; her wings weren’t doing much to keep her warm. The blanket that they’d fallen asleep with was nowhere to be found. Seeing that Twilight’s wing was still extended, she turned and started to slide back to get under it. She stopped as she felt her diaper suddenly start to slip from her rear. Figuring one or more of the tapes had somehow popped off in the middle of the night, she reached down with a hoof and discovered that the diaper was now really baggy; it wasn’t near as tight enough as it had been a few hours ago. Her eyebrows furrowing in confusion, Rainbow looked back and saw something a little unsettling.

Her wet diaper looked as if it was now two sizes too big. Cocking her head to the side, Rainbow looked back and found the stuffed animal that she’d been snuggling with just a few hours before. As she peered through the near darkness, she also made out the outline of her pacifier, laying right next to Mr. Bunny Wabbit. Somehow, both had gotten a lot bigger, just like her diaper.

An unsettling feeling suddenly filled Dashie. She knew something was wrong, and she started tearing up, silently praying that she hadn’t shrunk in size. “Mama, wake up! Wake up!” She tugged on Twilight’s wing as hard as she could, which didn’t amount to much. The sleeping alicorn didn’t budge.

Dashie nudged her side with her muzzle, nuzzling Twilight right above her breasts, hoping she’d get up. “Mama, pwease!” she whined, using her snout to poke Twilight’s stomach. After a few more pokes, the alicorn awoke.

“Mmmm… how’s my little foal this morning?” Twilight groaned as she felt Dashie nuzzle her breasts. “Is Dashie hungwy?” She wearily sat up and used her magic to turn on a few lights. As they started to increase in brightness, she looked down. Her wing was blocking her view of her foal, so just before she was about to fold it, she smiled, wanting the first thing her foal would see this morning was her gentle and caring smile. She carefully folded her wing, taking care not to hit Dashie on the head. As the lights became brighter and brighter, Twilight looked down, letting her gaze rest upon her foal.

Noticing the look of confusion and fear on her face, Twilight paused for a moment, finally taking note that something had gone terribly wrong. She simply stared wide-eyed at her marefriend, her jaw hanging open in surprise.

Dashie was no longer an adult mare. In fact, she was now no bigger than a young filly.

An Exciting Idea

What the... Twilight thought as she stared at Rainbow. No... there's no way she's a foal now... Not wanting to believe her eyes, Twilight shook her head and looked back down. A foal-sized Rainbow stared back up at her, tears brimming in her eyes. "Dashi... er, Rainbow, I... I..." She trailed off, at a loss for words. "You're a foal!" Twilight said, mentally hitting herself for stating the blatantly obvious.

"Mama! What's wong wif me?" Dashie cried out as she crawled towards Twilight, the oversized diaper making it hard to move. Latching onto one of Twilight's forelegs, she finally let the tears fall as she felt Twilight pull her close with a wing.

"There there, Dashie, Mama's here..." Twilight said softly, rubbing Dashie's back. As the foal cried into her shoulder, she bit her lip, trying to figure out how to rectify this most peculiar of situations. She wasn't sure what had caused Dashie to regress several years back to her foalhood, and in her groggy state of mind, she wasn't going to be able to figure anything out without getting a couple cups of coffee in her first. Maybe the magic was too powerful for Dashie's body to handle? Ugh... how could this have even happened?

Wondering if she still had her crotchboobs, she looked down and was surprised to find them still there. Her book had said that they would shrink back to their normal size overnight, but that obviously wasn't the case here. Twilight touched her left one with a hoof and hissed in pain; they were really sore and felt full. She knew that their plan was to keep Dashie in diapers till around noon today just to make sure that she wouldn't have any accidents due to her being incontinent, but she was starting to rethink that plan given their current situation. She didn't want to come off as selfish, but there was no getting around this; either she had to let Dashie breastfeed from her again or she was going to have to find some other way to relieve the pressure. On top of that, the diapers that Rainbow had brought over weren't going to fit her anymore; she'd have to use the ones that Spike wore when he was still young.

"Dashie? Mama has to go and get something, okay?" she asked softly, brushing Dashie's mane out of her face. Twilight wiped the tears from her foal's eyes, only to have Dashie latch on to her tighter. "I'm not going anywhere, Dashie..." Twilight cooed reassuringly. "Here, why don't you come with and help Mama out, hm?" Gently prying Dashie's legs from her own, she levitated her onto her back and grabbed Mr. Bunny Wabbit for her to snuggle with. Feeling the oversized diaper smush against her back, Twilight trotted across the room to the cupboards and pulled open the bottom drawer, searching for what she hoped she still had.

"Aha!" she said with a smile as she pulled out a package of foal-sized diapers. "I knew I didn't throw these away!" Pulling out the opened package, Twilight was glad to find that there was about half of the package remaining. "Alright, Dashie, let's get you in a diaper that actually fits you!"

She trotted over to the changing table, using her wings to keep Dashie from sliding off of her back. Twilight levitated Spike's old diapers over and pulled one out of the package, then looked over her shoulder to see Dashie clutching Mr. Bunny Wabbit to her chest. "Ready to get changed?" Twilight asked. When Dashie nodded back, Twilight lit her horn and gently grabbed her with her magic. "And up we go!" she said as she picked her up, laying her on her back on the changing table right next to the fresh diaper.

Twilight went to work, untaping the used diaper from her foal. Even though she had no idea what they were going to do to fix this situation, she knew she had to change Dashie into a better fitting diaper first. They wouldn't want her to have any accidents, after all. Lifting Dashie's hind legs, she pulled the used diaper out from under her and tossed it into the diaper pail. As she heard Dashie let out a few soft sniffles, she glanced up at her and made a funny face, hoping to get a smile from her distraught foal. It took a few seconds, but she made Dashie giggle all the same, making her smile back.

After her small giggle fit subsided and as she watched in rapt attention, Twilight wiped her nether regions clean with a wet wipe, eliciting another giggle from her. Twilight shot her a playful glare and unfolded the new diaper, chuckling when Dashie hid her head behind Mr. Bunny Wabbit. Without wasting a moment, she lifted Dashie's hind legs again, threaded her tail through the hole in the back, and slid the new diaper under her, giving her privates a good powdering to ensure she wouldn't get a diaper rash. She gently let her legs fall back down, used her magic to swiftly pull the front part up between her legs, and then taped it all together.

"There! All done!" Twilight said cheerily, giving Dashie's diaper a few pats. Now is the time to talk with her... to try and figure things out... a voice inside her mind spoke, breaking her from the cute moment. Twilight bit her lip and nodded to herself, then picked Dashie up and brought the two of them over to where all of the cushions lay. She found a particularly comfy one and lay down on her side, taking care to not sit on her still-sensitive crotchboobs. If she thought they felt full a few minutes ago, they felt really full now, making her consider to actually let Dashie breastfeed from her again. She suspected that her breast milk had something to do with Rainbow's change, so she decided to hold off on letting Dashie drink from her. Though right before she opened her mouth to ask if Dashie knew anything about how she was now a foal, she heard a loud grumble come from the foal's stomach.

"Aw, is my wittle Dashie hungwy?" Twilight asked in a foalish voice, giving Dashie a gentle nuzzle on her nose. "I have some foal food if you want some!" Dashie nodded back silently, never letting go of Mr. Bunny Wabbit. Twilight saw her flank wiggle in excitement, the diaper taped securely to her bottom making all sorts of crinkly noises. Using her magic, Twilight pulled a box near the stairs over to them and pulled the top open to reveal its contents.

Jar after jar of foal food lined the smallish box. Twilight had gotten all sorts of flavors, but she'd figured that Dashie would like the apple kind the best, so that was the one that she had stocked up on the most. Picking up the right jar, she used her magic to unscrew the cap and grabbed a plastic spoon from the box. Once she's had her fill, we'll talk about this and figure it all out... Twilight thought to herself as she pulled Dashie up against her side, holding her close with a wing. She was still waking up, so before she really started thinking about solutions to their problem, she just wanted to get the basics out of the way and play along with Dashie's fantasy for just a little bit more. Besides, what could go wrong?

Dipping the spoon inside the small jar of foal food, Twilight brought the spoon down to Dashie's mouth and said, "Open up, Dashie! Here comes the choo-choo train!" Dashie opened her mouth like a good foal and wrapped her lips around the spoon, then swallowed the sweet-tasting mush. She snuggled closer to Twilight and opened her mouth just like a baby bird would, silently asking for more. Twilight smiled and dipped the spoon back in the jar, then kept repeating the process until the jar was empty.

"There we go..." Twilight cooed as Dashie licked the spoon clean. She set both it and the empty jar aside, and just as she was about to stand up to go make some coffee for herself, she heard Dashie's stomach grumble again. Twilight was sure that Dashie couldn't be hungry anymore; the jar of foal food was definitely big enough to fill her stomach. Wondering what could be wrong, she leaned down and patted Dashie's back. "Hey, you feel okay?" she asked.

Dashie closed her eyes and shook her head, letting out a small whimper. Her stomach felt really unsettled, and before she knew what was happening, she felt the food she just ate come back up her throat. Surprised, she opened her eyes and tried to fight it back down, but it was to no avail. Not even a moment later, she threw up, her vomit getting all over the cushions they were on.

"Dashie! Aw... there, there..." Twilight said softly, rubbing Dashie's back with a reassuring wing. This is bad... really bad. If Dashie can't eat foal food, then it's probably safe to assume that she won't be able to eat real food... Twilight thought, biting her lower lip. If my breast milk is the only stuff that she can keep down, then... oh boy. If she keeps drinking from me, she's going to remain incontinent! She watched Dashie dry heave a couple of times before she settled back down against her side, tears streaming down her face. Well, I guess this can just be a short term solution...

"Feel better?" Twilight asked, using her magic to clean up her foal's vomit. Dashie nodded back silently as she used a hoof to wipe the tears from her eyes. "You want some of my milk instead? I'm sure it'll make your sick wittle tummy feel all better! Here, let me help you..." Twilight shifted and lay on her right side, stretching herself out. She lifted her left hind leg, presenting her bountiful orbs to her foal. She felt Dashie turn around and crawl closer to her orbs, then a moment later, she felt a small pair of lips latch onto one of her teats. Dashie started sucking, slowly but surely drinking her milk. As Dashie drank away, Twilight sighed happily, for the painful pressure she was feeling in her crotchboobs was starting to dissipate. A few minutes passed before Dashie switched to her other teat, taking about the same amount of time to drain that one.

When she was done, Dashie sat back and smacked her lips, her tummy full with her mama's warm milk. Thankfully, she didn't throw that up, proving that the only thing that she could consume was Twilight's milk, a fact that both worried her and sent shivers of excitement down her spine. Only really young foals were supposed to have breast milk, but she knew she wasn't that young. She'd have to be only a month or two old for that, but she was at least a year or two old, based on her size.

After letting Dashie have her fill, they had both gone upstairs so that Twilight could make her coffee. Once she had a nice hot mug of it in her grasp, she sat down at the kitchen table, placing her foal right in front of her on the table.

"Okay Dashie, the way I see it, there's only one way to determine if you're really a foal, and not just foal-sized," Twilight said after taking a few sips from her mug. "I'm going to cast the spell to reveal your cutie mark, and if it doesn't come back, then you are truly a foal." When Dashie nodded back in understanding, Twilight closed her eyes, lit her horn, and cast the spell. Unsure of what she should expect, when the spell was complete, she opened her eyes and looked at Dashie's flank.

Her flank was still blank.

"Huh... well, I guess that proves that," Twilight said, letting her shoulders slump as she thought. Taking another sip from her mug, she started coming up with solutions. "So listen, Dashie, we need to figure out what to do here, alright?" Dashie nodded back. "Okay, the way I see it, we have a couple of options here... One, you stay here with me while I try to reverse what happened to you, but that could take weeks, maybe even a month or two! I can't risk performing an age spell on you, mainly because I don't want to interfere with whatever magic has made you into a foal. I'll naturally take care of you as if you were my own of course, but most of my time would be spent researching. All of our friends and probably most of the ponies in town would find out sooner or later that you like this sort of thing, and I'm sure you wouldn't want everypony to find out, right? Or there's another option..." she trailed off as she pondered whether or not to bring it up.

"Oh what, mama?" Dashie asked, cocking her head to the side.

"Or... we could go on a little vacation, just the two of us. I know Princess Celestia said that I could come back anytime that I want if I wanted to have a little time off, so she's always kept my old tower ready for whenever I may need it. If we go, Princess Celestia would be able to help me turn you back into a mare a lot quicker than if I tried to do it on my own, and I think that'd be better for just her to know than the entire town knowing about our little secret, you know?" she asked, wondering which option Dashie would choose. "I'd be able to buy you all sorts of foalish things while we're up there, including diapers that actually fit you, cute little outfits that we can dress you up in, stuff like that. We'd be able to spend a lot more time together, and we can do all sorts of fun things a mother and her foal would do that we wouldn't be able to do here in Ponyville." Twilight finished off her coffee. "So... what do you think?"

"Dat one, dat one!" Dashie cried out. "I wanna go to Canterwot!" Truth be told, she thought it would be a wonderful idea to go up to a city where not a whole lot of ponies would recognize her. And on top of that, she was more than excited to hear that Twilight was going to take care of her in every way, just like if she was her own foal. That idea alone sent another shiver of excitement down her spine, making her jump up and down out of giddiness. In her excitement, she suddenly felt her diaper grow warm, making her pause. She looked down as she felt her diaper swell up in between her legs, the thick diaper pushing her hind legs further apart ever so slightly. "Uh... mama?" she asked sheepishly, pointing towards her diaper with a hoof.

"Aw, did my wittle Dashie have a wittle accident?" Twilight asked, giving her foal a small, loving nuzzle on her cheek. Dashie nodded back and reached towards her, letting off a soft whimper. "Come, let's get you changed, then we can make plans for our little vacation!"

The Epilogue

“So let me get this straight…” Princess Celestia paced back and forth in her throne room.

Twilight was sitting near the throne, Dashie nestled safely between her forelegs. They had picked up some supplies before they had hopped on the train to Canterlot that evening, and Twilight had changed Dashie into a fresh diaper before they had left. “You wanted to let Rainbow Dash live out her fantasy of being a foal for a day and the spells backfired… correct?”

“Partly,” Twilight said, laying a hoof around Dashie’s back. Her little body was trembling, though if it was out of sheer nervousness, Twilight did not know. “I cast a series of spells on her to make things more… realistic for her. Everything went smoothly until the next morning, where I had discovered that Rainbow Dash, my marefriend…” She looked down at Dashie and gave her a reassuring smile. “Had actually turned into a foal.”

“I… see.” Celestia stopped her pacing and walked up to them, then sat down. She smiled warmly at Dashie and lowered her head till it nearly touched the ground. “How are you, little one?” she asked softly. Dashie didn’t respond. Instead, she tightened her grasp on Twilight’s leg. Celestia giggled. “There’s nothing to worry about… Dashie, right?” Twilight nodded. “Your secret is safe with me, wittle Dashie. You have nothing to fear during your stay here.”

“My old tower is still available, right?” Twilight felt Dashie scoot backwards, pushing up against her breasts. Her breath caught in her throat for just a brief moment as she gasped. They were very tender to the touch and she needed them to be drained soon.

Celestia smiled at her. “Am I correct in assuming that your breasts are a result of one of the spells? They do look quite swollen, you know. When was the last time you drained them?”

Twilight lifted a foreleg to look down between her legs. “Earlier this morning. I tried to feed Dashie some foal food, but she threw it up almost immediately after swallowing it. I had no other choice than to let Dashie feed from me, but...” She bit her lip as she watched what used to be her marefriend start to mindlessly play with her own tail. “My… milk, for lack of a better term, makes her incontinent. The spell I had cast on her earlier was designed to make that happen, and...”

“And what?”

“I think that the specific combination of spells I used somehow affected the way my milk affects Dashie. I never meant for her to regress to the point of foalhood, and even though I really want for her to change back to her normal self...”

“I’m sensing there’s something else on your mind?”

Twilight nodded. “I’m having more fun with this than I thought. Calling her my foal makes me feel… I don’t know.” She blushed and glanced to the side. “I just feel all of these butterflies in my stomach, and I really do have a lot of fun taking care of her. I feel a lot closer to her because of all of this.”

At that, Rainbow looked up and nuzzled Twilight’s leg. She loosened her grip on her and cautiously stepped out from under Twilight. Dashie stared Celestia right in the face and nodded once.

Celestia locked eyes with Dashie, then glanced at Twilight. “Hold on a moment, Twilight. Can she understand us?”

Twilight nodded. “Mhm. I kept her adult mind intact throughout the process, and somehow, she retained it through her… regression.”

Celestia chuckled. “Well, this uncomplicates things a little bit.” She walked to look out the window overlooking the city. “To answer your question, yes, your tower has been cleaned and… stocked up for your arrival. I trust you’ll find everything to your liking, and I left a sizable bag of bits for you two to have some fun as mother and daughter around the city if you so choose.”

Mother and daughter? Dashie glanced up at Twilight. “Are you weally gonna be my mama?” Dashie’s tail wagged back and forth much like a dog’s; she simply couldn’t contain her excitement. Her diaper crinkled underneath her, but she paid that no mind. Her deepest fantasy was about to come true! She loved the fact that nopony in Canterlot would ever recognize her in her current state, and she had the most wonderful pony in all of Equestria to look after her.

“Yes, Dashie.” Twilight nuzzled her foal and laid a wing across her back. “You and I are going to have so much fun.”