The Finer Mechanics of Magic-Based Babying

Honestly, this wasn't that bad.

She thought to herself as she lay atop a smooth plastic mat adorned with clouds and rainbows. Nanny was busying herself with the supply bag, levitating out a few of the essential necessities. One would've sworn that the magical being was purposely lifting them high enough for the alicorn to spot them in the corner of her eye. She redoubled her efforts to control her blush.

Twilight, meanwhile, stared up at the ceiling. What a strange situation to end up in. She never would have guessed that today she'd not only be confronted about her buried desires, but also be able to act upon them. It was almost surreal. She was afraid that if she blinked, she'd be back in bed, with no-

"Such a quiet filly today, aren't we? You haven't fallen asleep again, have you?" Her ears flicked towards the teasing voice and she squeaked. "Or maybe you're just shy. Adorable, either way."

She chuckled and wiggled a bit, craning her neck to look around for the caretaker. "I-I mean, who wouldn't be a little nervous? It's not every day you get to experiment with this kind of stuff. In fact, I'm excited!" She stammered, then relaxed against the plastic mat.

Finally, Mary entered Twilight's view. Having to lift her head again to get a good look, she noticed that the being's ethereal mane was tied up into a bun. It looked nice. "Don't get too excited, now. We need to get you padded first! We don't want a mess, now, do we?"

"Hardy har har." Twilight grinned, propping herself up with a wing. Nanny just gently pushed her back down. "Very funny." She continued, but paused for a moment, just so that she could at least rest her head on a foreleg. Much better. "I don't think you'll have to worry about that for a while yet."

"Yet?" Mary asked simply, while shaking a plain white disposable diaper open with her magic. It rustled and crinkled as the front fell open, exposing the plush interior. It looked so soft. As the princess examined it, she felt her chest swell. Something within her, her urges, needed this comfort.

Eventually she broke her gaze away, to meet with Mary's expectant look. Oh, right, yeah. Nanny asked her a question.

"Yet, yes. I would like to try it in the future, but definitely not now. I don't think I'm ready for that now... Does that make any sense?"

Mary was just about done with vigorously sprinkling a hefty dose of sweet-smelling foal powder on Twilight's diaper area when she answered, though the cloud of powder obscured her warm smile. "Of course, hun. Just let me know if you change your mind." A few light taps to Twilight's inner thigh. "Lift that cute butt up, please~"

Twilight held a breath as she did as she was told, wiggling her hooves in the air. Her wings even flapped a few times, knocking the powder bottle on its side. With another few successive taps, she relaxed and released her breath, letting her bottom descend to its new cushion.

To say that it was comfortable would be a pretty accurate statement. As a pony whom often made nests of desk chairs and wooden flooring, and very rarely wore any kind of underwear or lower apparel, the idea of wearing a permanent tush cushion was a pleasant one.

"Wow. T-this is nice. Comfy~" She practically purred, doing a little wiggle atop the mat. It was all rather silly, considering the change hadn't even finished.

Shaking her head with a tutting noise, Mary brought the front of the diaper up and over, flattening it down and making short work of the six tapes. Just a few adjustments later, the diaper was securely fastened to the mare's waist. "There! My little cutie patootie is all diapered up! Why don't you toddle around a bit and see how it feels?"

Wobbling, the alicorn rose to her hooves, immediately noticing how her gait widened substantially. Crinkles echoed off of the walls as she quickly looped in a circle, wings outstretched for balance. When she was comfortable, Twilight turned towards her Nanny, beaming. "I have to admit, this is pretty great. I can't believe I didn't try this sooner!"

Mary shook her head. "Me either. You went through all the trouble of sneaking out and buying those weeks ago, but you didn't even try one on. I bet you feel pretty silly now, huh?" She grinned, but it quickly turned to a grimace as she noticed Twilight had stopped waddling.

She watched as her charge's body language changed so suddenly, locking up with her ears folded flat. Through their link, she could feel the rising regret and shame. Those teasing words had struck a nerve. She immediately wanted to take them back, raising her hoof to take a step forward.

Twilight had gone quiet. Those feelings of awkwardness suddenly began to creep back up on her. A part of her wanted to call this weird. Not normal. What was she even doing? Just take it off and bury these urges. She looked dumb, and she knew it.

Sensing the overflowing negative emotions, Nanny dashed to intervene, holding Twilight's cheek. "Shhh, hun, it's okay! Just take a second and breath. I'm here."

The gentle words were soothing. "T-thank you, Nanny. I just..." She shivered furtively, then nodded and took a long, deep breath. In, and out. A hoof held to her chest as she filled her lungs, forelocks tickling her barrel, then carefully extended the hoof as she released. At some point, she had sat down, leaning her cheek against Mary's chest.

"Better? How are you feeling, Twilight?" She whispered, petting Twilight's mane and stroking her back. "I was just teasing you, and you got a little spooked there! Spooked your nanny too~"

"Y-yeah, sorry. I'm good. Just a lot of emotions at once, I guess. Perhaps a little over-excited." She chuckled, muffled somewhat by what she was leaning against. "Thank you."

Mary gave a few more decisive rubs, then parted the hug by taking a step back. Neither of the ponies had noticed that Twilight had wrapped both wings around her during the hug. It was a sweet gesture, and it's rewarded by a chaste kiss to the forehead.

"Just doing my job as your nanny, sweetie. Now, why don't we go get you dressed up?"

After a brief trip to the closet, Nanny was now in the process of levitating a comfortable pink pajama top up and over Twilight's head, helping her thread her hooves through the puffy sleeves and adjusting the round collars. Next, Twilight had to step into a baby blue overall dress, keeping herself mostly still as Nanny dressed her, and the clasps were securely fastened. A pair of fluffy white socks adorned her back hooves. A quick grunt and fumble to pull the princess's wings through the proper slits, and the outfit was complete.

"You look adorable, sweetie~" Nanny reassured, watching over as Twilight looked at herself in the bedroom mirror.

"I feel adorable!" She beamed, lighting her horn to readjust the left suspender of her dress. It honestly looked as though she were a filly again... if fillies were tall, mature alicorn princesses with impressive wingspans. Maybe she didn't pull off the illusion perfectly, but it was still fun to play the part.

Mary trotted up and nuzzled into Twilight's cheek, using her own magic to put the suspender back where it had been. Even such a small gesture earned a pout and a blush from the pony. "Are you sure you don't want me to put your mane in pigtails? You'd look precious~" She offered, levitating some red scrunchies beside her.

"No thank you, Nanny. I think this is perfect as is." She returned the nuzzle, her ears tilting forward. With a smile still tugging at her cheeks, Twilight tried to spin in place to see how her padded butt looked now. The rustling white garment could definitely still be seen peeking out from under the skirt, and she found that she liked the look.

The ethereal pony, meanwhile, let out a quiet "Hmm..." as she stared at the mare's backside, contemplating something. Noticing the attention, Twilight was quick to give a cheeky wiggle of her booty , flicking her tail at her caretaker's nose.

Fizz, pop!

She jumped in surprise, whipping her head around. At first, Twilight guessed that something must have teleported. "Wuh? What happened?" She turned to Mary, who was smiling innocently. It was only when she caught the sight of her slightly poofier plot in the mirror that she narrowed her eyes.

"Did you just cast an enlarge spell on my diaper?"

Fizz, pop! Fizz, pop!

"H-hey, wait!" Twilight squeaked, trying to cover her lower half with her tail and tugging her skirt down with her hoof. Her back legs were forcibly spread wide, wobbling. The sudden weight and bad posture threatened to topple the poor princess on her butt. The pony besides her laughed, placing her own hoof on the padding, helping her keep her balance. "Gah! T-this is too thick! Go back a bit!"

Pop, fizz. The diaper shrunk down a bit.

Twilight let out a relieved sigh. Still not quite able to touch her back hooves together, or even squeeze her legs, but at least there was some circulation now. Her dress looked thankful for the change too, no longer creased and forced back to the waistband.

"Aww, I'm sorry, cutie! I just thought a bigger diaper might be better for such a big foal." Mary snickered, planting two quick but firm smacks on the booty, certain that Twilight had no chance of feeling it through the poof.

Lavender ears pinned back in embarrassment, and her wings gave a soft flap. "I-I'm not that big a foal." Twilight mock-whined, deciding she might as well play along with the teasing. It felt strangely liberating acting so immature around somepony. She was beginning to find more and more things to love about this fetish, even if it was embarrassing.

"Oh, you aren't? I suppose I better shrink that diaper back, then? If you think you're such a big filly, after all."

Twilight quickly shook her head. "Actually, I think I like them like this. It's weird, but they make me feel... safer? More secure?" She pondered, and she wiggled her diaper butt for emphasis. "Yeah." She confirmed her theory, looking away and scuffing a hoof on the carpeted flooring. "It's probably just me being silly, though. Hehe."

"Whatever you want, honeybun~"

Taking her by the hoof, Mary led Twilight away from the mirror, delighting at the mare's forced waddle. Sparks of magical energy surged through her hooves, ready to catch her the pampered mare she tripped. They made their way down the hallway, passing by a half-dozen doors, and took a turn to enter a lounge. Twilight was daintily deposited on the mat by the sofa, and heartily pat-patted on the noggin.

"I'll be right back, hun. I'm just going to get you some numnums! Be good while I'm gone~"

With a flash and a pop, she vanished.

A full three minutes passed, and Nanny still hadn't returned. Twilight hadn't moved from where she sat, waiting patiently. Another minute went by, then another. Her gaze wandered around the room, trying to find something interesting to do that didn't involve reading. As much as she found the activity to be a good way to pass the time, she figured that it wasn't really that proper for her current role. Nanny would probably (hopefully) just put the book away if she caught her reading it anyway.

Tucked away underneath a nearby table, Twilight spotted an old discarded plush. Levitating it over to her spot, she recognized it as one of Spike's old toys. A doll made in her friend Rarity's likeness. The mane was a bit dirty, and one of the button eyes had fallen off at some point. It brought up feelings of nostalgia, seeing her own Smartypants in the raggedy doll.

Looking around once more to make sure nopony was watching, she hugged the plush tight to her chest, wrapping her wings around herself. She hadn't hugged a plush in years. A light, bubbly feeling welled up, and Twilight let out a tiny squee.

"You're just too cute, sweetheart." Mary spoke up suddenly, making the diapered mare jump. How long had she been there? "Now, come and sit in Nanny's lap. It's time for your bottle~"

It was harder than expected to rise from her sitting position. The thick diaper was weighing her down and throwing off her balance. She landed back on her butt twice, but the third time was the charm. A few flaps, and she was up, hurriedly hopping up on the sofa.

The spot between Mary's far-spread back hooves was probably the most comfortable sitting spot in Equestria. She could feel Mary's silky dress beneath her thighs as she sat atop the skirt, and the familiar warmth now holding her close from behind. If she weren't so active, Twilight guessed that she could probably drift off to sleep right here.

A gentle boop from something rubbery to her lips interrupted her reverie. She blinked at the bottle, filled with milk, and flared her horn to take the proffered object with her magic. Just as soon as it's enveloped in a pink aura, it was overtaken by a darker purple aura, and she lost grip of it.

"Ah ah. I don't think so, little one. Nanny will feed you, okay?" Mary said behind her, close to Twilight's ear. Said ear twitched, and she nodded submissively. "Good girl. Open up~"

It was easy to just let Nanny take charge. Her lips parted and the bottle's amber nipple filled the space. It was held there, letting the violently blushing Twilight work the feeding process out on her own. Her first instinct was to suck all the air out of the nipple, like a straw, which did next to nothing. Next, she tried coaxing the milk out with several slower intakes of air, and received a splash of warm milk against her tongue as a reward.

Logic dictated that maybe this was the ideal method? She spent the next few moments adjusting her technique, and before long she was bottle-feeding like a pro.

She was so focused on this task that she didn't notice a few rogue droplets of milk dribbling down her chin. She didn't even notice Mary's hoof descending to take hold of Twilight's skirt, ever so gently lifting it to expose more of the brilliant white padding underneath. The other hoof roamed up and down the plastic surface, tracing lines without much pressure at all. Just enough for the little one to notice.

And Twilight noticed, stopping her suckling momentarily. For some reason, drawing attention to the poof hugging her waist made Twilight feel small. She felt safe in her diapers. Protected. She resumed the feeding, closing her eyes, replaying those thoughts in her head. There was a calmness, more than she had ever felt. Every worry or pressing thought just melted away, leaving her to just relax.

Mary watched on as Twilight started suckling automatically, leaning all of her weight back on her caretaker. Her wings went completely slack, and there wasn't a peep out of her other than the 'nuk nuk' of her suckling, soft breathing, and the occasional coo.

"That's it, cutie. Just relax for Nanny. You're comfy and happy in your diapers. Not a single worry or stress."

They were her diapers. With them, and Nanny, and the warm milk, she felt lighter than a feather. She let herself fall deeper into the serene relaxation, as a heaviness settled on her eyelids.

Before long, Twilight was snoring.