Young At Heart
by milesprower06

Birthday For A Baby

Rainbow's heart pounded against her chest as her hooves landed on the dirt of Sweet Apple Acres, just inside the front gate. She slowly trotted up to the farmhouse, the awkwardness settling in again. Applejack's letter had done wonders to calm her nerves, but now that she was about to look at her marefriend face to face for the first time in over two weeks, her nerves were becoming a bit frazzled all over again.

She came up the steps, and the front door was opened before she could knock, and there stood Applejack, smiling.

“Well, there's my favorite mare in Equestria.” Applejack said, coming forward and hugging the pegasus. “Happy birthday sweetheart.”

With that, Applejack invited her in, showing her to the back bedroom. Together, the two of them sat down on the bed.

“I know the traditional thing is usually dinner, then presents, then cake, but I figured we'd do things a little different this time around.” Applejack told her. Rainbow shuffled nervously in her sitting position on the bed.

“Look, we've been dancing around this awkwardness for the past two weeks, so I'm just gonna come out and say it. I'm... I'm sorry for letting this thing out in the open and all. It's just that with how much we mean to each other, it didn't feel right hiding any part of me from you.”

“Don't be sorry. If anything, I'm sorry for reactin' the way I did. I saw how nervous you were, and I didn't do anything to calm you down. You just wanted to share every bit of who you are with me, and there ain't no shame in that. To show you how sorry I am, I got ya a little something.”

Applejack went to the closet, and came back around with two gift-wrapped boxes, and set the smaller one down on the bed in between her and Rainbow.

“Happy birthday, hun.”

Rainbow untied the bow, and tore off the wrapping paper, and quickly removed the lid. Upon peering inside, her eyes widened, as did her smile. Her hooves reached in, and came out with a Daring Do plushie. She hugged it tight.

“Aww! It's awesome! Thanks!” she said, smiling at Applejack. Applejack smiled back, and moved the first box out of the way to make room for a second.

“That was nothing. This is what I worked to get done on time for your birthday.”

With that, Applejack slid a considerably larger box in front of Rainbow. She undid the bow and lifted the lid once again, and this time, her face was more disbelief than immediate joy. Placing her front hooves on the sides of the box, she leaned forward, and peered inside.

Inside, neatly organized, was a bottle, pacifier, and bib, all with her cutie mark on them, a set of hooved fleece sleeper pajamas with the Wonderbolt insignia patterned on it, several jars of baby food, feeding spoons, two bottles of foal powder and of course, two dozen diapers. All in her size.

“I hope you don't mind, I asked Rarity for your waist measurements, since we'd never bought each other any clothes. I wanted to make sure I got the right size.”

Unable to take her eyes off the contents of the box, she finally was able to keep her mouth from hanging open.

“You... You went to get these from Gentle and Soothing Care at Silly Filly?”

“I saw the name on the packs of diapers when you first opened the drawer. I mean, if we're celebrating your birthday down here, how else am I gonna be able to make you my adorable little foal?”

This finally brought Rainbow's eyes up from the box, to meet Applejack's smiling face.

Biting her lip, Rainbow pushed the box to the center of the bed, slid forward, and threw her front hooves around her marefriend, before taking a shuddering breath and began weeping into her mane, her shoulders quaking. Applejack quickly returned the embrace, rubbing her back, confident that these were tears of relief and joy.

“I was so stupid about this whole thing,” Rainbow began to whisper through her sobs. “I had this whole explanation put together in my head, and it all fell to pieces when I finally showed you. Then because I bolted when it got too awkward, you go and get answers from where I buy everything. I was so sc-scared, that I screwed us up... That this was gonna make you fall out of lo-”

“Sweetheart...” Applejack said, interrupting Rainbow's heart-pouring. “You don't need to fret over this no more, ya hear? I couldn't imagine you wanting to act like a foal, even after they explained everything, even as I was picking stuff out... But I guess I'm gonna find out tonight, because they made it absolutely clear how special this is to you. So I wanted to make it crystal clear how special you are to me. I love the side of Rainbow Dash that's athletic and brash, if a bit egotistical. I'm sure I'll love this side of you too.”

Applejack released Rainbow from the embrace, wiping the tears from her marefriend's eyes.

“I'm sure you're quite hungry for dinner, but before I can do that, first I have to get my fully grown foal into her diaper, don't I?” Applejack said, playfully shoving Rainbow onto her back, before reaching over to the box to get one of her new diapers from the box along with a bottle of foal powder. When she came back to between Rainbow's back legs, she noticed an instant change had taken place in her marefriend. She was embracing her new Daring Do plush with one hoof, and sucking on the tip of her other.

“Now now, that's what this is for.” Applejack said, reaching back over to the box, and got the new pacifier, and slipped it into Rainbow's mouth. As she began to gently suckle on it, she looked up at AJ as she got the diaper unfolded and made sure the tapes were on the right end.

'Here goes nothin' Applejack thought to herself. She lifted the tip of Rainbow's tail and threaded it through the tailhole in the back. Once it was through, she lifted Rainbow's rump off of the bed and slid it up to the base, making sure the back wings were flattened out before setting the pegasus down. She twisted the bottle of foal powder open, sprinkled a liberal amount over her diaper area, rubbing it in, and then brought the front of the diaper up between her legs, smoothed the front side up against her stomach, and then brought the back wings up and taped it up securely. Seeing Rainbow wiggle her legs a bit, making it crinkle was very cute, AJ had to admit. Still, that wasn't as hard as she thought it'd be.

The last piece of advice the Cares had given her was that every adult foal is different, and the only way to figure out what they wanted was to experiment. So she decided to approach it using her experience raising Apple Bloom. So she leaned down quickly and gave Rainbow a raspberry on her stomach, and hearing the muffled giggle Rainbow gave through her pacifier made Applejack's heart skip a beat. She pulled Rainbow up to a sitting position and went back to the box.

“Alright, time for num-nums.” she announced, grabbing a jar of applesauce and feeding spoon from the gift box.

The Silly Filly supply store spared no detail. The adult size spoons had rubber ends, and the jars of baby food were in the appropriate serving sizes, otherwise she'd be here all day feeding Rainbow the proper amount for dinner. AJ got the bib from the box and tied it around her neck. She was getting cuter by the second.

She unscrewed the jar lid and got a spoonful of applesauce. She brought the spoon to Rainbow's mouth, only to have her keep her lips sealed and try to turn her head away from the spoon. Applejack, playing along, timed it right, and gently slid the spoon in between her lips, getting some on her chin and bib in the process. The farmer couldn't help but smile. She scooped up what had dribbled down, and got the rest of it in Rainbow's mouth.

Rainbow, of course, switched up her game. On the next bite, she gave AJ a break, but on the third, she took it in, and as Applejack was preparing the fourth, Rainbow slowly spit the applesauce out, letting it drip down her lips.

“Ah ah ah, back in there.” Applejack chastised, somewhat amused at the authenticity of Rainbow's role play. As she got the hang of things, Rainbow made things less of a hassle, and simply took the food as it came. Once the jar was empty, she set it on the nightstand while Rainbow laid back down, satisfied.

“Alright, my little Rainbow. I'll be right back.” She told her, grabbing the adult-sized foal bottle from the box and got up to go to the kitchen. Once she was there, she flipped on the light and went to the fridge, grabbing the pitcher of apple cider. She untwisted the rubber nipple, carefully poured the bottle full of her family's famous beverage, then screwed the nipple back on before replacing the pitcher in the fridge. Returning to her bedroom, she saw Rainbow on the bed, smiling at her, a smile that widened when she saw the contents of the bottle. AJ got back up on the bed, and was getting ready to give Rainbow her bottle when she noticed the blue sky landing zone of her diaper had turned to a darker thundercloud graphic.

“Uh oh, did my little Dashie wet herself?” AJ asked, causing the pegasus to blush at the cheeks. The farmer softly pressed against the diaper, and got a light squish sound in return.

“Doesn't seem too soaked right now. Alright, here we go.”

Applejack slid up to the head of the bed, taking a reclining position, and ushered Rainbow up next to her. She gently guided her head down to where it was laying on her lap. Now that she was comfortable, she put the nipple up to Rainbow's mouth, and slid it in between her lips. She immediately began to suckle, and the cider flowed into her mouth and danced across her taste buds. She lightly squirmed her legs as she nursed from the bottle, enjoying the squishy crinkle sound she got from it. Applejack noticed this, and reached a hoof down to lightly pat the front of her diaper. When the bottle was half empty, she heard a light rumble come from Rainbow's stomach.

'She still can't be hungry, she's had plenty so far.' Applejack thought to herself. There came another rumble, and as the bottle got to a quarter empty, Applejack felt Rainbow tense up slightly, followed by a wet fart, and more crinkling sounds from the diaper. It didn't take her long to deduce what Rainbow just did. By the time she was finished with the bottle, the smell had reached her nose.

“Rainbow, did you make a stinky?” Applejack asked in her best motherly voice, making Rainbow blush even more. She reached down a little father with her hoof and pushed against the seat of her diaper, getting a warm, resistant squish in return.

“Yep, you're definitely a smelly filly.” She said, giving her behind another good swat, encouraging her to get up. Rainbow sat up while AJ went to go get a towel.

“Alright, let's get you changed.” AJ said, unfurling the towel and putting it on the bed, then proceeded to grab Rainbow by her hind legs and pull her from the head of the bed down towards the end, so her diaper area was on the towel. She grabbed a fresh diaper, and the box of wipes from the box beside her. She tore the tapes off one by one, then slowly opened it up. The front of the inside was soggy and yellow, and the back was smeared with her manure, which smelled that much stronger now. Dealing with barn animals on a daily basis, Applejack didn't seem to be disgusted in the slightest. The only thing that surprised her was the volume of it; much greater than was an ordinary foal would produce.

The adult sized wipes, along with a pair of wet washcloths, made the job a whole lot easier. Applejack had the dirty diaper wrapped up and thrown away in under three minutes, and a fresh one laid out under her. The smell of the baby powder was a very welcome change from Rainbow's messy diaper. AJ took note of how excited that had made Rainbow, seeing her glistening marehood as she powdered her nethers. Applejack briskly went over to her nightstand, and pulled an item out of the drawer.

Rainbow was snapped out of her euphoria when she felt something poke at her sex. She glanced down at Applejack, still blushing.

“Appujack?” She asked, her speech hindered by her pacifier.

“Well, I took care of the 'foal,' now to take care of the 'adult.'”

Applejack gently and easily slid the egg toy inside Rainbow and strapped the controller to her thigh before bringing the diaper up and taping it securely shut.

“Keep that pacifier in your mouth, hun. We don't want you making too much noise.”

With that, Applejack turned the knob of the controller on, slowly increasing it to it's highest setting. Rainbow let out a gasp, but kept the nipple of the pacifier in between her teeth. When Applejack had the dial at it's highest setting, she climbed up on the bed on top of Rainbow, and began grinding against Rainbow's diaper, kissing her neck.

The diapered pegasus was in absolute bliss. The vibrating inside her, the crinkling of the diaper as she squirmed, and the weight of her marefriend on top of her was rapidly pushing her towards the edge. She was only half surprised; being diapered, fed, messing herself, and getting changed by AJ was more than enough to build her up. She began to moan through her pacifier as AJ thrust into her harder, nipping her neck now.

With a muffled squeal, Rainbow came, releasing into her clean diaper. Applejack reached down and turned the vibrator down to low, only to turn it back up to high after five seconds and press against Rainbow's padded pussy, bringing her to a second peak. Rainbow's eyes crossed, becoming overwhelmed with pleasure as Applejack pulsed the vibrator from low to high, keeping her in her second climax as long as she could. After a minute, her body went limp, and Applejack turned the vibrator off, gently pulling it out of her and the diaper through the leg gatherer.

“Well look at that,” Applejack began, patting the front of her marefriend's diaper again. “I just changed you and you've already gotten this one wet again. Just what am I going to do with you?”

Not being able to take it anymore, Rainbow let the pacifier fall from her mouth, and pulled Applejack into one of the most heated kisses she could remember giving. Their tongues danced together for over half a minute, and they both parted, gasping for air.

“Best... Birthday... Ever...” Rainbow panted.

Applejack smiled back, pulling the covers back and getting the light on the wall. She removed her hat, and slid under the covers next to her marefriend.

“Happy birthday, my adorable little Dashie.”

Author's Note

There ya have it. I hope the targeted audience enjoyed. I know this story was a bit barebones, but this was my first attempted ageplayer story,and I didn't want to derail it with fluff.

Thanks for reading!