Dashie, will you be my Mommy?

by Tilgoreth

Rating: mature
Tags: Human, Sunset Shimmer, Fluttershy (EqG), Romance, Equestria Girls, Porn, Fetish, Rainbow Dash (EqG), Profanity, Slice of Life, Sex
Length: 5946

(Written by Tilgoreth) Rainbow Dash discovers that her girlfriend Fluttershy is an adult baby.

(Written by Tilgoreth)
WARNING: Contains AB/DL themes. Also contains mild sexual themes.(Mostly innuendos.)
WARNING:Do not read if you do not like those things.

Rainbow Dash discovers a stack of diapers and baby clothes in Fluttershy's dresser. After a tear filled confession Rainbow learns that her girlfriend is an adult baby. With some convincing from Sunset Shimmer Rainbow Dash agrees to treat Fluttershy like a baby for a day. She's in for more than she bargained for though when she realizes that she doesn't think Fluttershy looks all that unattractive in a diaper.

Cover art image belongs to Geotastic.

Published 2017-09-07 01:20:06 UTC
Last updated 2017-09-07 01:20:06 UTC

Dashie, will you be my Mommy?

Rainbow Dash grabbed her hair as she paced back and forth in front of the school. Sunset Shimmer was leaning against the court yard statue, it was after school and most students had already went home. Rainbow took in deep breaths as she continued to pace. Sunset Shimmer looked at her friend with concern.

“Rainbow Dash, you can’t let it bother you so much,” Sunset said.

Rainbow Dash stopped pacing, her face was hot with sweat. “What do you mean I can’t let it bother me?!”

Sunset sighed. “Rainbow, why don’t you run through the story for me again. Okay?”

Rainbow Dash nodded. “Well, I went to Fluttershy’s house on Friday. And her parents were gone so….”

“Hey, Fluttershy!” Rainbow Dash yelled as she knocked on her girlfriend's door. “Let me in!”
The door opened with a creak. “Hi Rainbow Dash, please come in. Here we can-What happened to your clothes?!” Rainbow Dash was completely soaked from head to toe.
“Yeah, the sprinklers in the park came on when I was walking through. Can I borrow some of your clothes?”

Fluttershy said, “Of course, Dashie.”

Fluttershy took Rainbow Dash back to her room. “My clothes are in the top two drawers. I’ll go make us some tea.”

“Thanks!” Rainbow Dash yelled as Fluttershy poured water into the tea pot and set it on the stove. Rainbow Dash hurriedly looked through Fluttershy’s clothes. She found a pair of shorts and immediately disrobed. To her dismay, she found that they were too small for her.

Come on she has to have something in my size. Rainbow Dash thought as she closed the first two drawers. She opened up the last drawer, she felt around inside. What?! Rainbow thought as her hand gently scraped a plush garment.

Rainbow Dash pulled out the garment, in her hands she was holding a soft white diaper. A butterfly pattern was printed on the waistband. Flipping it over, looking inside, Rainbow was surprised to find that it was an adult diaper.
Since when do they print adult diapers with patterns?! Rainbow Dash thought as she continued to look at the plush white garment.

Fluttershy hummed to herself as she carried a tea tray up to her room. “Rainbow Dash, you like chamomile right? Sorry, it’s all I had. Rainbow- what are you doing?!”

The tray fell from Fluttershy’s grasp. Hot liquid poured from the teapot, staining the carpet. The tea cups clanged against the floor as they rolled away. Rainbow Dash looked up at Fluttershy. “Uhhhh, so you have diapers?”

Fluttershy’s face was crimson, bright red. “Rainbow Dash, I said my clothes are in the top two drawers.”

“Well yeah, but none of them fit me.”

Fluttershy squeaked, she was looking for her voice. “Rainbow Dash, I uh..I uh..it’s..not what you think...I..I..”
Fluttershy collapsed to her knees. Large wet tears rolled down her cheeks. “Ahhh huh huh!” Fluttershy cried as she tried to wipe the tears from her eyes. Rainbow Dash dropped the diaper, she wrapped her arms around her girlfriend.

“Fluttershy, it’s okay. I promise it’s okay,” Rainbow Dash said as she embraced her girlfriend. Fluttershy rested her head on Rainbow’s chest. After a few minutes, her crying turned into soft whimpers. “Fluttershy, I...I..I don’t know. It’ll be okay."

Sunset Shimmer leaned back against the statue as Rainbow Dash finished her tale for the second time. “And you comforted her after that?”

“She was worried that I’d want to break up with her. I mean I don’t know, I didn’t really know what that diaper meant at first. Then she pulled out a bunch of pacifiers and baby bottles. And some other baby clothes. But all this stuff was adult sized,” Rainbow Dash said.

Sunset nodded. “Fluttershy said she was an adult baby?”

Rainbow nodded her head, she paced back in forth in front of Sunset. “Which is fine, I guess. I mean I don’t know what to say.”

“Well, do you still love her?”

Rainbow Dash bit her fingernails. “Of course I do! It’s just that this is so weird! She likes to act like a baby!”

Sunset sat up and looked at her blue skinned friend. “Rainbow Dash, you have to understand it from Fluttershy's perspective. These feelings she has, she likely doesn’t want them. But she also can’t help it. And if you really love her, you have to accept them.”

“I know, I know. But, I don’t think I could ever really get into that, you know?”

Sunset said, “Do you mean sexually?”

Rainbow Dash stopped pacing, she rubbed the back of her neck. “Well, to be honest, Fluttershy and I don’t really do much together anyways. I mean besides just kissing you know? But I don’t think I could ever really find Fluttershy wearing a diaper attractive. And I definitely don’t want to wear a diaper myself.”

Sunset nodded. “And that’s perfectly fine. You don’t have to share the same fetish as your girlfriend. But you have to understand that it isn’t a choice for her, not really anyways.”

Rainbow snorted. “That’s easy for you to say! You can just touch someone and instantly know what’s wrong with them!”

Sunset said, “Maybe, but empathy isn’t about reading someone's mind. It’s about trying to put yourself in someone else's shoes. Rainbow, when you found that diaper, it was shattering for Fluttershy. This was probably something she didn’t even tell her parents about, let alone her girlfriend. You have to be sensitive of that, this wasn’t something she wanted you to know about.”

Rainbow Dash fell backward onto the sidewalk. “Yeah, I know. It’s just so weird.”

“That may be, but you can’t shame her for it. It’ll only make her feel worse. I’m not saying you have to indulge in it, but you have to at least accept that it’s something she does.”

“Thanks for talking with me Sunset,” Rainbow said.

Sunset smiled at her friend. “Anytime Rainbow. I promise I won’t tell the other girls, at least not until Fluttershy is ready herself. But she doesn’t have to share if she doesn’t want to. And you’re sure she won’t be mad that you told me?”

Rainbow shook her head. “If there’s anyone Fluttershy would have wanted to tell, it would have been you. If only because you can just touch her arm and empathize with her.”

Both girls giggled at this. Sunset moved closer to Rainbow, she placed her hand on Rainbow’s shoulder. “Rainbow Dash, have you talked with Fluttershy about this since last Friday?”

“Huh, yeah. I said that I didn’t want to break up with her over it, and I said that it was okay. I mean I don’t think I really meant that last one until now, but whatever. After I said that, she asked me to be her Mommy,” Rainbow said.

Sunset raised her eyebrows. “Her Mommy?”

Rainbow nodded. “Yeah, it’s a part of her fetish. I think it’s called AB/DL? I don’t really know. But I guess some people like to have someone treat them like a baby. And that person is their Mommy or Daddy. I guess she can’t really ask her Mom to do it, especially not when it’s sexual.”

Sunset said, “Are you sure it’s sexual for Fluttershy?”

Rainbow shrugged. “She said it isn’t. But, I mean it’s a fetish. So it has to at least be partially sexual for her. I guess that’s fine, but I’m not going to wear a diaper, even if she begs me.”

Sunset chuckled. “She’s your girlfriend, but don’t let her force you into doing things you don’t want to do. That’s not healthy. But try and at least be open minded about it. I mean wearing a diaper for you girlfriend isn’t so bad right?”

Rainbow lightly flicked Sunset’s cheek. “Stop it. I don’t know, if she really wanted me to I guess I could do it. But I’m not into that. Huh. Do you think I should be her Mommy? I mean treat her like a baby for a day? That’s what she asked me to do.”

Sunset sighed. “I can’t tell you what to do Rainbow Dash. I’m only here to offer advice. But I think it would be good for you and Fluttershy. Indulge her for a day, it isn’t every day your girlfriend lets you live your sexual fantasies. But if it really isn’t sexual for Fluttershy, if she likes being a baby as some type of therapy, don’t force anything on her. If sex comes naturally, it comes naturally. But don’t force her to do anything sexual. And always make sure she’s comfortable.”

Rainbow Dash sighed, she leaned her head on Sunset’s shoulder. “Thanks, Sunset. Yeah, I guess I’ll be Fluttershy’s Mommy. Even though that’s completely weird. Huh. And you promise you won’t tell the other girls?”

Sunset giggled. “Rainbow Dash, my lips are sealed.”

Rainbow nudged the fire haired girl lightly. “I really appreciate that. I’m gonna head home then, call Fluttershy and tell her I’ll do it.”

Sunset said, “See you tomorrow! And Rainbow Dash, really do make sure you make Fluttershy feel comfortable. The same goes for you, don’t let her make you do anything that you find uncomfortable.

“I know, I know! See you tomorrow Sunset!”
Rainbow Dash took out her phone; Fluttershy answered immediately.

Weakly, “Hi Rainbow Dash. You’re on your way home now?”

“Yeah. I uh, I uh just talked to Sunset, about the uh you know diaper thing. Don’t be mad! I just, I really needed to tell someone. And Sunset, well you know she’s really good at empathy and that mushy stuff. Huh. Listen Fluttershy, I’ll uh, I’ll be your Mommy,” Rainbow said.

Fluttershy clutched her phone tightly as she emitted a high pitched squeal. “Thank you so much Dashie! I love you! I promise it won’t be sexual, I’m not into it for sexual reasons. My parents are out of town on Saturday, why don’t you come over then?”

Rainbow sighed. “Yeah, that sounds good. I’ll talk to you later. I love you sweetheart.”

“I love you too Dashie!” Fluttershy said excitedly before Rainbow hung up.

Rainbow put the palms of her hands to her face. Of all the things in the world she could be into, it just had to be diapers didn’t it? Rainbow thought as she walked home. Of course she didn’t think it was all bad, it meant she would spend more time with her girlfriend. And besides, Saturday was four days away

Fluttershy danced on the balls of her feet, it was Saturday, and Rainbow Dash was coming over. Dashie’s gonna be my Mommy! Fluttershy thought excitedly as she watched the minutes on the clock tick by. Rainbow Dash said she would be at her house by twelve, it was twelve fifteen.

While not entirely late, Fluttershy bit her lower lip nervously. What if she isn’t okay with it? What if she doesn’t love me anymore?! Fluttershy thought, tears forming in her eyes. She wiped them away, Dashie wouldn’t hurt her. Not after all the times she stood up for her anyways.

A loud knock resounded on the front door. Fluttershy hurriedly moved to open it. “Rainbow Dash! I’m so glad you’re here!”

Rainbow raised an eyebrow. “Well yeah, I mean I said I’d come over. To be your Mommy….Uh so why don’t we just get started then?”

Fluttershy blushed. “Sorry Rainbow Dash, it’s just that, it’s awkward for me as well. I really never wanted to ask you to be my Mommy, but I uh, I kind of felt like it’d be okay once you found out.

Rainbow Dash rubbed the back of her neck, she didn’t look Fluttershy in the eye. “Well, as weird as it may be for you, it’s even weirder for me. I mean, finding out your girlfriend likes wearing diapers, and being treated like a baby, that’s not exactly normal....But I won’t judge you for it! I know you can’t exactly help feeling the way you do, and that’s fine. I just uh, I just can’t do the sexual stuff, at least not when I can barely do the non sexual stuff.”

“Rainbow Dash, I already said it isn't a sexual thing for me. Don’t worry about that, and I would never make you do anything that you felt uncomfortable with,” Fluttershy said.

“Right, right. It’s just, it’s just hard. I won’t lie Fluttershy, it was really hard to force myself to come over here today. It’s just uh, it’s just not something you expect. So be easy on me? I love you Fluttershy, it’d take a heck of a lot more than wearing diapers to make me not love you.”

Fluttershy wrapped her arms around the blue skinned girl. “I love you too Dashie. Here I’ll show you what I want to start with.”

Fluttershy grabbed Rainbow’s hand and took her upstairs to her room. Next to Fluttershy's bed there was a changing mat with baby powder and a stack of diapers. Fluttershy grabbed one, it was the same kind that Rainbow had found last week. “I want you to change me into a diaper.”

Rainbow Dash looked at the floor, her face was a deep crimson. “I uh, I don’t know. Couldn't you do that yourself? I mean you’re eighteen years old Fluttershy, you can change into your own diaper.”

Fluttershy looked down at the ground, the diaper crinkled as she held it. “I know, but you said you’d be my Mommy. Babies don’t change their own diapers Dashie.”

“Well I mean, I know that. But uh, you wouldn’t you know, use them right?” Rainbow asked.

Fluttershy said, “Well, I would. Babies don’t know how to use the potty. But if that makes you uncomfortable, I won’t do it.”

Rainbow sighed. “Well, to be honest, it really does. But if it’ll make you happy, I’ll do it.”

Fluttershy smiled. “In that case, Mommy come change me into a diaper.”

Rainbow Dash sighed as she grabbed the diaper from Fluttershy. Fluttershy removed all of her clothing and laid down on the changing mat. Rainbow Dash blushed when she looked at Fluttershy’s crotch.

“I uh, I haven’t seen that part of you yet. It uh, it looks nice. Good job, on having a nice vagina….Uh...I kind of think it’s uh…” Rainbow said, trailing off as her mind wandered to what she could do with Fluttershy in this position. “You wouldn't want to you know, do it right now would you?”

Fluttershy said, “No, you’re my Mommy. And my Mommy is supposed to change me into a diaper. Sorry if this isn’t fun for you Rainbow, I just don’t do it for sexual reasons. And to be honest, I don’t know if I’m ready to do that with you yet.”

Rainbow sighed, her shoulder slumping. “Yeah I know, I won’t force you to do anything. That wouldn’t be right of me. It’s just, seeing that part of you, it kind of uh makes want to do that you know? I already love you Fluttershy, so seeing that is kind of hard for me.”

“If you’re uncomfortable, we can stop. I don’t want to force you into anything,” Fluttershy said.

Rainbow shook her head. “No, it’s just I expected to see it under different circumstances is all. More sexual circumstances….Uh it doesn’t matter. Here just stay still, Mommy needs to put a diaper on her baby.”

Rainbow lifted up Fluttershy’s legs; the diaper slid nicely underneath. “Now uh, I uh have to put the baby powder right?”

Fluttershy nodded. Rainbow Dash grabbed the bottle of baby powder, unscrewing the cap, a cloud of white dust exploded on Fluttershy’s crotch. “Ehuk! Oh it’s in my eyes! I can’t breathe!” Rainbow said as she sneezed out baby powder.
Fluttershy giggled. “You have to twist the cap, not take it all the way off. It’s okay, I have more baby powder so it’s not a big deal.”

“Right, right. I I’ll just scrape some off,” Rainbow said as she lightly removed a thick layer of powder from on top of Fluttershy’s crotch.

Fluttershy giggled. “You aren’t copping a feel now are you?”

“What?! No, I uh just it’s uh...Well come on Fluttershy, it’s hard for me to not want to have sex with you right now.”

Fluttershy frowned. “Rainbow Dash, it really isn’t sexual for me. And I’m not comfortable having sex with you right now. I really hope you can understand that.”

Rainbow sighed. “Fluttershy, I won’t do anything to you unless you want me to. It’s just, really hard right now to not want to have sex with my girlfriend.”

“Continue,” Fluttershy said.

“Right.”

Rainbow Dash rubbed her eyes, they still burned but there wasn’t any powder in them. She folded the front end of the diaper on top of Fluttershy’s crotch. Pulling tightly, she took the side tabs and placed them on top of the diaper. They sprung back.

“What the heck?! Isn’t this like supposed to stick?!”

Fluttershy said, “You have to peel back the tabs first, then they’ll stick to the front of the diaper. And make sure it’s tight, Mommy doesn’t want her baby to have any leaks does she?”

Rainbow Dash did as Fluttershy instructed. She pulled back the plastic from the tabs and pulled them tightly on top of the diaper. After checking both sides Rainbow found that the diaper was securely placed on Fluttershy.

“All right, so is that it?” Rainbow asked.

Fluttershy giggled. “Mommy, there’s more to it than that. You have to make sure your baby girl is dressed properly.”

“Right,” Rainbow said, her gaze moving over Fluttershy’s breasts. “I mean you don’t have to cover those right? I uh...I like them.”

Fluttershy blushed, and covered her breasts. “Uh thank you Rainbow Dash. But no, I was thinking of wearing booties.”

“Boobies?” Rainbow said with a grin. “Why Fluttershy, if you wanted me to cover your boobies with my hands, I’d be more than happy to oblige.”

“No, not boobies, booties, they’re just little shoes that babies wear. They're over there on the night stand.”

Rainbow Dash got up, and took the booties off of the nightstand. They were a light yellow color, a pink ribbon sat on the top. They were once again adult sized, thick padding covered the inside of the frilly shoes.

Fluttershy didn’t help her Mommy as Rainbow slid her feet into the booties. “Now see that string? Tie it, you don’t want your baby to have cold feet now do you?”

“Right,” Rainbow said as she tied a knot at the ankle around both booties. “Is that it?”

“Mommy’s baby is cold, she needs something to wear. Grab that sun dress in the bottom dresser drawer. No, the yellow one.”

Rainbow knelt down again, holding a light yellow dress. This time Fluttershy helped her Mommy put the dress over her. It came short just above her diaper.

“Now Mommy’s baby needs her mittens, you don’t want her to get cold do you? They’re on top of the nightstand as well.”

“So uh, you sure about this? With these on it’ll be pretty hard for you to do stuff by yourself,” Rainbow said as she pulled the mittens over Fluttershy’s hands.

“I’m just a wittle baby, I can’t do anything by myself. That’s why I need my Mommy to do it for me.”

“Right,” Rainbow said as she tied a knot around the mittens at Fluttershy’s wrist. She gingerly patted her girlfriend’s diaper. “So are we good now?”

Fluttershy nodded. “Mommy’s baby is hungwe now. Baby want baba.”

“Uh.. right...that’s uh…” Rainbow said as beads of sweat rolled down her face. “Where is that?”

“There are some bottles in the bottoms dresser drawer.”

Fluttershy’s Mommy took out one of the glass bottles, adult sized again. “So uh how do we do this?”

“There’s some milk in the fridge downstairs. Poor that in the bottle, then put it in a pot of water, and let it boil.”

“You want the milk warm?”

“Isn’t that how babies drink it?”

“Yeah,” Rainbow said, “but why can’t I just put it in the microwave? This bottle doesn’t have any metal in it right?”

“I don’t know exactly, I just know it isn’t healthy. I think the milk enzymes break down in the microwave. And for babies, boiling it in water ensures it heats up more evenly.”

Rainbow nodded. “Alright, that makes sense. I’ll be right back.”

Fluttershy waited patiently in her diaper while Rainbow went downstairs to boil her milk. She poured the milk in the bottle, making sure not to overfill. She looked at the nipple, she decided that it’d be stupid to put the bottle in boiling water without it.

She poured several cups of water into a large pot, and placed it on the stove top. Setting it on high, she waited for the next twenty minutes until the water boiled. She tested the milk on her arm. “Ahhh! That’s freaking burning!” Rainbow said as the milk burned her skin.

She put the bottle in the freezer, and after five minutes took it back out. Testing the milk on her arm again she found that it was an acceptable temperature. She went back upstairs to Fluttershy.

Fluttershy had moved to her bed, and was rocking back and forth, biting her foot. Rainbow froze in the doorway, her eyes lingered for just a second on Fluttershy’s crotch, on the diaper there.

She blushed. “Hey Mommy’s back! Baby want her baba?”

Fluttershy nodded eagerly. Rainbow sat down on the bed next to her. She placed Fluttershy in her lap, the crinkling diaper made her wince. Taking the bottle in her left hand, cradling Fluttershy’s head with her right, she began to feed Fluttershy the warm milk.

Fluttershy slowly sucked on the nipple, droplets of milk pouring into her mouth. Still blushing, Rainbow smiled at her girlfriend. Fluttershy’s eyes were closed, she was completely immersed in the moment. She felt the soft touch of her diaper against her body, the warm milk filling her mouth, the loving touch of her girlfriend.

Fluttershy fidgeted, the diaper crinkled against Rainbow’s crotch. The blue skinned girl looked away, her face was bright red. It’s just a diaper, I didn’t even feel this way when I saw her vagina. What’s going on?! Rainbow Dash thought as she continued to feed her girlfriend.

Saliva drooled out the side of Fluttershy’s mouth as she finished drinking from the bottle. “All done Mommy!”

Rainbow repositioned Fluttershy, the diapered girl was now straddling Rainbow. “Good baby girl! Now Mommy has to burp you, okay?”

Fluttershy nodded. Rainbow pressed Fluttershy close to herself, placing one hand on her back, and letting the other linger towards Fluttershy’s diaper. Gently she slammed her palm into Fluttershy’s back, electing a burp from the diaper wearing girl.

Rainbow blushed as her hand gently pushed into the back of Fluttershy’s diaper. Beads of sweat rolled down her face.What am I even doing, I don’t think she looks sexy in a diaper. I don’t have any fetishes! I’m Rainbow Danger Dash danget!Rainbow thought as she continued to feel Fluttershy’s plush posterior.

Fluttershy burped one more time. “All done?” Rainbow asked.

Fluttershy nodded. “All better Mommy!”

Fluttershy pulled away from Rainbow Dash, the blue skinned girl discretely pressed her hands into Fluttershy’s diaper. “What do you want to do next?”

Fluttershy pulled away, pushing Rainbow’s hands off her diaper. “Mommy I want to go downstairs and watch cartoons and play with my toys.”

“Really?” Rainbow asked.

Fluttershy nodded. “Yes, Mommy.”

“Alright then.”

Both girls went downstairs, Rainbow Dash carrying several baby toys with her. She was the Mommy after all, her little girl couldn’t do any work. Rainbow Dash flipped through some channels, she landed on one about some cartoon velociraptors.

The show was about Twiggly Wiggly, the Regent velociraptor of friendship. She and her friends went around their world solving peoples friendship problems. “Fluttershy, this show is kind of gay,” Rainbow said.

Fluttershy shrugged. “I like watching it when I’m being a baby.”

Rainbow Dash continued to watch the show. After a few episodes it started to grow on her. Her favorite character was Dirigible Danger, the fastest velociraptor in all of dinosaur land. She was cool, and often saved the day. Rainbow didn’t understand why the other characters called Dirigible “egotistical”.

Dirigibles best friend was Diffident Raptor, a very shy raptor who had trouble interacting with other dinosaurs besides Dirigible. But over time Dirigible was able to help Diffident become more confident. Dirigible is so cool. Rainbow thought as she watched Dirigible comfort Diffident after Dirigible had caught Diffident reading a graphic novel.

Rainbow Dash snorted at this. Dirigible and Diffident were perfect for each other! Why would Dirigible care so much about what Diffident did in her free time? She blew hair out of her eyes. Fluttershy hadn't paid much attention to the show itself, she liked it more as a backdrop.

She’d been stacking blocks, knocking them down, and giggling to herself about it. Her favorite toy was the rattle, which Rainbow took away almost immediately. “Mommy wants to listen to the show," she’d said as she put the rattle on a high shelf.

Fluttershy cooed as she continued to play with her blocks, not an easy feat with her mittens on. But the mittens only made her smile, she felt really helpless without the use of her fingers. After about two hours Fluttershy tugged on Rainbow’s shirt.

“What is it?” Rainbow asked.

Fluttershy couldn’t make eye contact with her girlfriend. She only rubbed her arm gingerly. “I think we should go back upstairs.”

“Why?” Rainbow asked, she was rather enjoying the cartoon. The blue skinned girl looked down at her girlfriend’s diaper. Gingerly, she placed her hand on the front. Not unsurprisingly she found that the diaper was completely wet, it was starting to leak.

“Oh, you need to be changed,” Rainbow said, offering a hand to help Fluttershy up. Fluttershy waddled in front of Rainbow, her diapered butt shaking as she walked back up the stairs. Rainbow blushed as she watched her girlfriend’s diaper crinkle as she walked. It’s just a diaper, why does it bother me so much?! Rainbow thought as she followed Fluttershy up the stairs.

Fluttershy laid down on the changing mat, her legs spread far apart. The diaper was completely soaked, causing it to expand and push her legs apart. Rainbow Dash carefully removed the tapes holding the diaper in place and pulled the diaper out from Fluttershy’s butt.

The diaper completely wet, started to crumble on itself in Rainbow’s hands. In order to avoid any of the pee leaking she quickly deposited it in the trash. She grabbed another diaper off of the stack, placing it under Fluttershy’s butt again.
This time Rainbow only twisted the baby powder cap, she didn’t take the whole thing off. She generously sprinkled powder on top of Fluttershy’s crotch, and lifted up her girlfriend's legs to get some on her butt.

She pulled the front of the diaper on top of Fluttershy’s crotch. Holding it in place as she pulled the tabs off of the side, and placed them firmly on the front of the diaper, doing the same for the other side. Feeling the diaper, Rainbow was happy to find that it was once again securely put on her girlfriend.

Rainbow looked at her phone, it was 4:30, not too late, but she knew her parents would want her to be back by six. “Hey Fluttershy, what’s the last thing you want to do with your Mommy today?”

Fluttershy put her finger to her chin. “I’d like you to just cuddle me.”

“What?” Rainbow asked.

“You know, hold me like a baby.”

“Oh, that’s what you mean. Would you want to be close to me?”

Fluttershy nodded. “Mommy, I’m just a baby, I need to stay by you.”

Rainbow looked away, she was blushing again. Her crinkly diapered butt pressed close to me? What’s going on….

There was a rocking chair in the living room, Rainbow sat down on this and gingerly laid Fluttershy on her lap. Making sure that her girlfriend’s diaper was pressed firmly against her crotch. Fluttershy put a light yellow pacifier in her mouth, a butterfly was printed on the front.

Rainbow held Fluttershy tightly as she gently rocked the chair. Her blush increased as Fluttershy fidgeted, causing her diaper to push even closer to her crotch. Oh Fluttershy, please stop! I don’t know why, but your diaper really turns me on right now!

Rainbow hesitated, she could tell her girlfriend this. Fluttershy couldn’t judge her, not when she liked being treated like a baby at least. Rainbow sighed, in all her life she never expected to think diapers were sexy.

Fluttershy sucked gingerly on her pacifier, lulling her to sleep. Rainbow leaned back, her girlfriend’s diaper placed firmly on her crotch, cuddling Fluttershy in her arms, she smiled as she drifted off into sleep.

They both woke up about an hour later. “Eherm. It’s late Fluttershy, my parents will want me home soon. Huh, my Mom would probably start the ‘Rainbow Dash, the best girl at getting kidnapped at night!’ club.”

Fluttershy giggled. “I like your parents.”

“Yeah, they’re pretty cool aren’t they?” Rainbow replied.

Fluttershy nodded. “I wet myself again...sorry…”

Rainbow shrugged. “Fluttershy, you’ve been wearing a diaper all day. It wouldn’t be fair for me to expect you to do anything else. I’m just glad you didn’t do the other bathroom option while I was here.”

Fluttershy said, “Could you change me into normal clothes before you leave?”

Rainbow gently helped her girlfriend off her lap. “Of course, I’m your Mommy aren’t I?”

Rainbow Dash smiled as she changed Fluttershy’s diaper for the third time that day. The taping, powdering, was routine for her at this point. So routine she didn’t think twice when she gave a firm pat on Fluttershy’s fresh clean diaper.

“Um, Rainbow, I wanted to be changed into normal clothes.”

Rainbow rubbed the back of her neck. “Oh yeah, I kind of got caught in the moment. Sorry about that. I can take it off if you want?”

Fluttershy shook her head. “Dashie, I’m already wearing a diaper, it’d be a waste to take it off now. It’s okay, my parents won’t be back until late tomorrow. I’ll have time to change out of it before then. Thank you, Dashie. It means a lot that you did this with me today.”

“Fluttershy, I love you. I uh...I..uh….” Rainbow said trailing off. Fluttershy stood up and put her hand on her girlfriend's shoulder. “Fluttershy can I tell you something?”

Fluttershy nodded. “Rainbow Dash, I’m your girlfriend. You can tell me anything. Especially now that you know I’m an adult baby.”

Rainbow Dash sighed. “Fluttershy, I think you look really sexy in that diaper. I’m really turned on right now.”

Fluttershy raised her eyebrows and started laughing. Rainbow Dash blushed, and grabbed her arm. “Hey! I didn’t laugh when I found out you were an adult baby did I?!”

Fluttershy composed herself. “Dashie, it’s just that of all the people in the world, I never ever would have expected you to have a diaper fetish.”

Rainbow grumbled. “Well, I didn’t either. But I do, at least I do now. Seeing you in that diaper, it really turns me on. I think you’re really sexy wearing that diaper.”

Fluttershy blushed. “Really?”

Rainbow nodded. “I don’t think I’ve ever been more turned on by you. And I saw your fucking vagina.”

Fluttershy grabbed a diaper off the stack. “In that case, would you please put this on?”

Rainbow fell backward. “What? No! I may think you’re sexy wearing a diaper, but that doesn't mean I want to wear one! And you may be okay with wetting yourself, but pee grosses me out! I don’t want to sit in my own pee all day!”

Fluttershy giggled. “Dashie, only wet the diaper if you want to. But I think you might look really sexy wearing a diaper. And, indulge your girlfriend one last time?”

Rainbow moaned. “Fine.” She quickly pulled off her shorts and panties, and let Fluttershy diaper her. She stood up, her butt facing towards Fluttershy.

Fluttershy blushed. “Dashie, you’re really sexy wearing that diaper. I’m actually turned on right now…”

Rainbow smiled. “Really Fluttershy? I mean it’s kind of hard with the diapers on, but could we have sex now?”

Fluttershy said, “No, I’m still not comfortable with that. And even though I think you’re sexy wearing that diaper, being an adult baby still isn’t sexual for me. But I accept that it’s sexual for you.”

“Well, I guess it’s sexual. I don’t know. I literally never felt this way about diapers before, maybe it’s just because you’re wearing them,” Rainbow said blushing even harder.

Fluttershy giggled. “Dashie, you’re my girlfriend. You don’t need to feel ashamed of your fetish. I’ll love you no matter what.” She gently kissed Rainbow Dash on the cheek.

Rainbow twirled her hair. “So, do you think we could do this again sometime?”

“Dashie, I’d love for you to be my Mommy as often as you can,” Fluttershy said, hugging her girlfriend. “But remember, while it may be sexual for you, it isn’t for me. I need you to respect that. And I’ll respect the fact that diapers are sexual for you.”

Rainbow squirmed under Fluttershy’s touch, her girlfriend’s diaper was pressed incredibly close to her own. She was sweating profusely now. “Fluttershy, I think you’re really sexy. I’m really turned on right now. Can I please go? I don’t think I can take this much longer.”

“Well maybe if you’re a good girl, I can wear a diaper more often,” Fluttershy said, standing up and pressing her diaper butt into Rainbow’s crotch. Rainbow squirmed, she couldn’t take this anymore.

Fluttershy turned around and hugged her girlfriend again. “Can you do one last thing before you leave?”

“What?” Rainbow asked.

Rainbow Dash turned off the light as she kissed Fluttershy on the forehead. She was snuggled up in her bed, her butt still diapered as ever.

“Thank you Rainbow Dash. I’m really glad we spent the day together,” Fluttershy said.

Rainbow said, “I love you Fluttershy. I had...fun today. I’ll do it anytime you want.”

Rainbow gentley closed Fluttershy’s front door as she walked out into the cold night. The wind brushed past her legs, sending a chill up her spine. Gingerly she placed her hand on her crotch, it crinkled.

I forgot to change back into my normal clothes! Rainbow thought as she hurriedly tried to reopen the door. To her dismay it was locked, she thought about knocking on the door, but she didn’t want to wake her sleeping girlfriend.
She sighed. Well I guess now’s as good a time as any to tell my parents that I’m an adult baby. Hands on her hips, she strode home. Diapered butt and all. The crinkling of her diaper blended into the night, as common as the chirp of a cricket.

She pulled out her phone, thankfully she’d put that in her jacket pocket, and texted Fluttershy. Hey sexy, wear that certain garment you know I like to my house tomorrow, my parents will probably be gone most of the day. We can have fun in my room, if you’re comfortable with that????

Rainbow Dash smiled, she knew her girlfriend would be wearing a certain white crinkly garment when she came to her house tomorrow.

THE END?

Author's Note

Yeah I know this is weird. I'll write a sequel, but it'll be more explicit.