I had waaayyy too much fun writing this chapter. Hope you all enjoy it as much as I did!

A beam of sunlight slowly began to creep across the floor of Sugar Belle’s room, eventually falling on the slumbering mare’s face. Grumbling, Sugar Belle batted at the light, as if trying to knock it away from her face so she could continue sleeping. After several attempts, Sugar Belle yawned as she opened her eyes, realizing that her attempts at getting back to sleep were in vain. As she rubbed the sleep from her eyes, she sat up in bed, her ears perking up at the sound of muffled crinkling coming from beneath her covers.

Snapping awake, Sugar Belle ripped the covers off, starring wide-eyed at the thick diaper she was wearing. All at once, the events of last night came flooding back to her. Big Mac revealing his secret to her, revealing her secret to him in turn, him offering to be her “Nana”, him diapering her and singing her a lullaby…

The unicorn blushed at the lingering emotions she felt after everything that had happened, unknowingly sucking away at the pacifier still in her mouth. A part of her still wondered if everything had just been a dream, a wonderful dream she was only now waking up from.

Her ears perked up again as she began to notice a sound coming from downstairs. Listening closer, Sugar Belle could just make out what sounded like singing. Was Big Mac already awake? Her curiosity peaked, Sugar Belle climbed out of bad and walked towards the door to her room, her diaper causing her to waddle the whole time. As she opened the door and stuck her head out, she could hear the singing much clearer now, cautiously tiptoeing out into the hall and following the sound. Reaching the stairs, Sugar Belle crouched down and peered through the gaps in the railing.

From the top of the stairs, Sugar Belle could just make out the kitchen below, as well as the large form of Big Mac standing in the kitchen, wearing the clothes he had shown her the night before as he worked to make what she could only assume was breakfast, humming to himself the entire time. Seeing Big Mac dressed like he was finally confirmed to Sugar Belle that the events from last night had not been a dream, but had been very real indeed. The unmistakable smell of apples and cinnamon wafted up to tickle her nose, her stomach grumbling as she was reminded of how hungry she was.

Sugar Belle moved to climb down the stairs, only to pause before her hoof could touch the top step. Glancing behind her, she shook her diapered rump, causing the diaper to crinkle slightly. While Sugar Belle utterly adored how the diaper always managed to push her back legs apart enough to turn her walk into a waddle, one thing she had never even considered was needing to travel up and down stairs while wearing the thick padding. She had always indulged herself in the comfort of her room, so needing to use the stairs had never been an issue until now. She couldn’t help but imagine herself ultimately tripping down the stairs, wincing at the mental image of her falling into a heap at the bottom.

“Bi—“ Just as she began to call out the Big Mac, Sugar Belle stopped herself as she remembered Big Mac’s words from last night. He said he would be willing to be my Nana, so maybe… “Na… Nana?”

Big Mac stopped singing at the sound of Sugar Belle’s voice, turning around and glancing up at her, a warm smile spreading across his face at the sight of her. “Ah, I see my little filly is finally awake!” He said in his Orchard Blossom voice. “I meant to wake you up sooner, but y’all looked so peaceful I couldn’t bring myself to disturb ya. I’m almost finished makin’ breakfast, so why don’t ya come on down while Nana gets everythin’ ready for ya?”

Sugar Belle said nothing, nervously glancing at the steps before glancing back down at Big Mac.

Big Mac gasped. “Oh! Does somepony need some help gettin’ down stairs?”

Sugar Belle nodded her head, pleading with her eyes for Big Mac to come and help her.

“Oh, dear! How silly of me! I wouldn’t want my Sweetie-Pie to accidentally take a tumble and hurt herself, now would I?” Switching off the burner, Big Mac galloped over to the stairs and walked up towards Sugar Belle. “Oh, please forgive Nana for being so forgetful! She should know that little fillies like you need extra care sometimes!” Reaching the top of the stairs, Big Mac held out his hoof to Sugar Belle. “Here, let Nana help you down the stairs…”

Smiling, Sugar Belle graciously reached out to grab Big Mac’s hoof, suckling her pacifier as she was carefully led downstairs. While she did end up tripping once or twice, Big Mac was there the whole time to steady her and keep her from falling. After several slow moments, they finally reached the bottom as Sugar Belle was led into the kitchen.

Letting go of her hoof, Big Mac walked over to the table and pulled out a chair for the infantile mare. “Go on, climb up for Nana.”

Doing as she was told, Sugar Belle hopped up onto the chair and plopped her padded rump down on the seat, giggling as her rump sunk into the soft padding of the diaper. Her tail wagged behind her as she watched Big Mac scoop out what appeared to be fresh porridge into two bowls and set them on the table, taking the seat next to her as he gently popped her pacifier out of her mouth so she could eat.

“Now, Nana knows how hungry you must be, Sweetie Pie, but Nana has to ask you somethin’ first. Are you a big mare who can feed herself, or do you want Nana to feed you instead?”

Sugar Belle blinked at the odd question, glancing down at the bowl of porridge in front of her. Ordinarily, needing to ask for help to feed herself was something she had never considered. And yet… she couldn’t deny how appealing the idea sounded to her in that moment, and how utterly foalish it sounded.

Giggling, Sugar Belle threw up her arms and exclaimed, “Nana feed! Nana feed!”

“Alright, settle down, little one,” Big Mac said with a chuckle as he picked up Sugar Belle’s spoon with his hoof and scooped up a helping of porridge. After blowing on it to make sure it wouldn’t be too hot for such a young filly, he held it out to her and said, “Now, open wide for Nana!”

Opening her mouth with a loud, “Aaahhh…”, Sugar Belle was rewarded with a spoonful of apple porridge, the taste of apples and cinnamon tickling her taste buds as she chewed.

After taking a moment to eat some of his own porridge, Big Mac scooped up another spoonful of porridge and held it out to Sugar Belle. “Here comes the train, Chu Chu!”

And thus, the pair fell into a happy rhythm as they enjoyed their breakfast. Eventually, Big Mac fed the final spoonful to Sugar Belle, noticing that despite his best efforts, Sugar Belle had somehow gotten porridge on her belly. “Looks like somepony is a messy eater! Nana will just have to make sure to make you wear a bib from now on then.” Getting up, Big Mac picked up the bowls to put in the sink for later, before grabbing a washcloth and running it under the tap for a moment. Walking up to Sugar Belle, Big Mac began to wash the porridge out of his marefriend’s fur, prompting a bout of giggles to erupt from the pink unicorn.

“Na… Nana! Stop!” Sugar Belle pleaded in-between giggles. “That… that tickles!”

“Hold still, Nana is almost done…” After a few more seconds filled with giggles, Big Mac eventually finished scrubbing the mare clean, stepping back to let the mare catch her breath. “There! A clean foal is a happy foal! Now, since you were such a good little filly while Nana fed you, Nana has a surprise for you!”

Sugar Belle giggled, clapping her hooves together in excitement as she watched Big Mac walk over to the fridge and reach inside, her eyes widening as he pulled out one of the baby bottles she had brought, only this one had been filled to the brim with milk. When did he…

After taking a moment to warm up the bottle with hot water and dry it off, Big Mac walked back to the table and set the bottle in front of Sugar Belle. “Now, you sit right here and behave yourself while Nana goes upstairs for a moment. Can you be a good foal for Nana while she’s gone?”

Nodding her head, Sugar Belle picked up the bottle in his hooves and brought it to her lips, soon rewarded with a steady flow of warm milk for her efforts. Sugar Belle didn’t even notice Big Mac leave, drifting deeper and deeper into a foalish mindset as she happily suckled her bottle, her belly filling up with warm milk.

Sooner than she would have liked, however, the bottle finally ran dry, a few last suckles only earning her puffs of air in return. Setting the bottle back down, Sugar Belle was unprepared as she let out a loud burp, covering her mouth with her hooves as she began to blush once more. Giggling, she popped her pacifier back in her mouth and leaned back in her chair, rubbing her now full belly with a content sigh. “Ahhh… this is the life…”

“I’m back!” Big Mac called out as he strolled down the stairs, the bag of Sugar Belle’s supplies slung over his back. “Now that yer nice and full, I think yer ready for some play time!”

Sugar Belle squeed with excitement as she was helped down from her chair before racing off into the living room. Big Mac couldn’t help but chuckle as he watched her padded rump sway along with her tail, bringing to his mind the image of Winona as he followed behind her. Pulling out a blanket and unrolling it onto the floor, Big Mac pulled out all of the toys Sugar Belle had brought with her and set scattered them in a circle atop the blanket. “There, now everything’s ready for my little one to enjoy herself!”

Without needing to be told, Sugar Belle plopped herself down on the blanket before reaching for the nearby blocks and beginning to stack them. After she had stacked them up to her horn, Sugar Belle knocked the bottom brick out from under it, giggling as the tower tumbled down around her. As she reached for the blocks to begin stacking another tower, she realized that something was missing, glancing around at all the toys with worry. “Where—“

“Hello, Sugar Belle!”

Looking up, Sugar Belle found herself face-to-face with Cupcake, nearly toppling back out of surprise. Looking past the stuffed bumblebee, she saw he was being held by Big Mac, the stallion sitting across from her as he puppetted the plush animal. Raising his voice even higher than he already had, he said, “It’s me, Cupcake! Yer very bestest, westest friend in the whole world! That looks like fun, can I play with you? Pretty, pretty please?”

Holding her hooves over her mouth, Sugar Belle giggled as she replied, “Sure! I’d love if you would play with me, Cupcake!”

And so, Sugar Belle played with her toys in infantile bliss, the time just flying by as the air was filled with the sound of joyous laughter. Suddenly, Sugar Belle paused from her playing as a sudden urge made itself known, frowning as she glanced down at her diaper.

She had to pee. Normally, the fact that she was wearing a diaper would usually cause her to go with barely a second thought, often times so lost in the mindset of a foal that she barely even noticed. However, the thought of doing so in front of Big Mac made her feel suddenly very self-conscious, biting her lip as she wiggled around.

Noticing Sugar Belle’s sudden change in behaviour, Big Mac asked, “Sweetie-Pie, what’s wrong?”

Refusing to meet Big Mac’s eye, Sugar Belle eventually managed to mutter, “I… I have to go potty…”

Big Mac paused, realizing quickly the situation Sugar Belle was in and why she seemed so ashamed. After thinking it over for a moment, Big Mac picked up Cupcake and began to make it speak again. “But, Sugar Belle! The potty is for big ponies, not little foals like you! That’s why you wear diapers, so you don’t have to worry about using the potty yet!”

“I… I guess?” Sugar Belle replied uncertainly.

“However…” “Cupcake” continued, “I’m sure if you asked Nana, she’d let ya use the potty like a big pony. I’ll be with you the whole time, so no need to be afraid!”

Sugar Belle was silent as she considered Cupcake’s words. Just like with breakfast, she realized Big Mac was offering her a choice, the choice to only take things as far as she was comfortable with. What’s more, she realized he was letting her know in his own way that no matter what choice she made, he would stick by her.

After a moment of thinking it over, Sugar Belle made her decision, scrunching up her face as she tried to let go.

At first, nothing happened, years of potty training fighting against her. Steadily though, a small flow began, quickly becoming a roaring stream as Sugar Belle wet her diaper, a low hissing sound filling the room as her diaper began to swell beneath her. After what seemed like an eternity, it finally stopped, leaving the mare now wearing a very used diaper. “Na…Nana?” She squeaked out, glancing up at Big Mac with pleading eyes.

“Yes, Sweetie-Pie? Tell Nana what’s wrong.”

“I… I…” Blushing heavily, Sugar Belle looked like she was about to start crying as she finally said, “I… I had an accident…”

“Oh, come here, Sweetie-Pie…” Big Mac cooed as he hugged the mare, running his hoof comfortingly down her back. “Don’t be sad, that’s why foals like you need to wear such soft diapers, to hold in all their little accidents. It’s nothing to a shamed of.” After holding her for a few more moments, Big Mac stepped back and booped her lightly on the nose. “Just lay back, and Nana will see about changin’ ya into a nice fresh diaper. How does that sound?”

Nodding her head, Sugar Belle suckled her pacifier for comfort as she laid back onto the blanket, listening as Big Mac rummaged around inside the bag for a moment. Keeping her eyes trained on the ceiling, she could hear the loud rip of the tapes as her diaper was undone, the cold air brushing against her fur as the used diaper was pulled out from under her. A small shriek escape her throat as she felt the coldness of wipes against her fur, but it was only for a moment before she felt the soft padding of a fresh diaper slide under her rump, followed by the scent of talcum powder in the air.

The whole time, Sugar Belle was strangely calm, almost like having her diaper changed like this was the most natural thing in the world to her. And it might as well have been, as she basked in the feeling of safety and security of having her diaper changed, knowing that meant there was somepony there to look after her and make her feel loved. Eventually she felt the front of the diaper being pulled up before the tapes were secured in place, sealing her once more into a soft, cushiony diaper.

“There, all clean!” Leaning down, Big Mac pressed his lips against Sugar Belle’s belly and blew a short raspberry, prompting the mare to erupt into a fit of giggles. “There’s my happy filly! I was wondering where she went.”

“Thank you, Nana,” Sugar Belle said, staring into Big Mac’s eyes as she removed her pacifier and tilted her head up so she could kiss him on the nose. “I love you, Nana.”

“And I love you, my adorable Sweetie-P—“

KNOCK! KNOCK!

In an instant, the atmosphere inside the cabin popped like a bubble, the two ponies shooting to their hooves as they stared in the direction of the front door, their hearts simultaneously skipping a beat as they heard more knocking against the door, followed by a voice that made their blood chill. “Big MacIntosh? Sugar Belle? You two fella’s home?”

“It’s Wood Chipper!” Big Mac said, whispering under his breath to keep from being heard by the pony at the door. “We can’t let him see us like this!”

“I know!” Sugar Belle whispered back, just as terrified as her colt friend. “What do we do!?”

“Should we wait for him to leave?” Big Mac suggested.

“But doesn’t he have a spare key to the cabin? What if he comes in!?” Glancing over at Big Mac, a desperate idea began to form in her mind. “Quick, give me your dress!”

“Wha…what?”

“Just do it!” Sugar Belle replied, nearly ripping the sundress off the stallion’s body with her magic before he finally got it off and she was able to throw it on herself. It was obvious at a glance that the dress was clearly too big for Sugar Belle, but Sugar Belle was banking on that in the hopes that it would work to conceal the diaper she was wearing. Pointing at Big Mac, she said, “You stay hidden, I’ll go see what he wants.”

“But… but Sugar Belle–“

“Coming!” Sugar Belle called out as she strolled over to the door, wincing at every little crinkle her diaper made. Finally reaching the door, she threw it open to find Woods standing on the porch, blinking at her sudden appearance. Putting on the best smile she could manage given the situation, Sugar Belle tried to remain calm as she said, “Oh, Wood Chipper! What a pleasant surprise!”

“Hello, Sugar Belle,” Wood Chipper greeted with a tilt of his hat. “Sorry if I’ve come at a bad time…”

“No, no, no, no! I was just busy drying my mane after a shower, which is why I didn’t hear you right away! Did you need anything perhaps?”

“Just came by to let y’all know I’ll be headin’ into town for a bit, and wanted to see if there were anything ya wanted me to pick up while I was there.”

“N-no, I think we’ve got everything we need. Thanks for the offer, though…”

“Alright, if ya sure…”

As Wood Chipper began to walk away, an idea suddenly popped into Sugar Belle’s head. Do I dare? “Uh… Wood Chipper! Hold on a moment!”

Pausing, Wood Chipper turned back around to look at her. “Ah, think of something ya need?”

“Well, it’s just… if it’s not too much trouble, I mean… I was wondering… wondering if you wouldn’t mind picking me up some paper and crayons while you’re in town?”

Wood Chipper raised an eyebrow at the odd request. “I could try, but whatever for?”

“Well…” Glancing around, Sugar Belle smiled as she said, “It’s just… being here has started to awaken my more creative side, and I was hoping I could draw something to remember it all by.”

“Ah, I see!” Wood Chipper replied with a grin. “Captivated by the landscape, are we? Can’t blame ya none, even after all these years I still find myself being wowed by the place. Alright, I’ll see what I can do! I expect I’ll be back some time before nightfall, so don’t wait up for me, and y’all have a pleasant day now!”

“You too!” Sugar Belle called back as she watched Wood Chipper depart. Once she couldn’t see him anymore, she jumped back inside and slammed the door behind her, slumping against it for support as she slid down onto her diapered rump with a relieved sigh. Phew! Good thing I already went, or I would have probably wet myself out of fear!

Poking his head up over the couch, Big Mac asked, “Is… is he gone?”

“Yeah, he’s gone…” Sugar Belle replied, sighing as her racing heart began to go back to its normal rhythm. “That was way too close a call…”

“Eyup.”

The two shared a glance between them for a moment before breaking out into a fit of laughter, laughing from a mix relief and at how utter absurdity they must have looked in that moment.

After getting their laughter under control and catching their breath, Sugar Belle grinned as she looked over at Big Mac. “You know… Woods said he probably wouldn’t be back for some time, so how would you feel about doing something a bit more… adventurous?”

Big Mac raised an eyebrow at Sugar Belle’s choice of words. “What’d y’all have in mind?”

“Well…”

****

Some time later, the pair exited the cabin and stepped out into the sunlight as they began a slow trek into the bordering forest. However, rather than go out for a stroll as a couple, they instead were going as a Nana and her foal, with Big Mac wearing his yellow sundress again as he carried a picnic basket on his back. Sugar Belle followed beside him, the light blue dress she was wearing doing an adequate enough job of hiding her thick diaper, besides the occasional crinkling coming off her as she walked.

While the two were understandably nervous about going outside dressed as they were, they couldn’t deny that they felt a certain exhilaration from it, secure in the knowledge there there weren’t any ponies around to gawk at them. Still, they didn’t travel far, only a few minutes away from the cabin just in case somepony were to stumble upon them and they needed to make a swift getaway.

After laying out the picnic blanket, the pair settled in for a nice quiet lunch of sandwiches and veggies, with a few bottles of warm milk packed for Sugar Belle to enjoy. Very little was said between them as they enjoyed their lunch, just enjoying the other’s company as they basked in the sights and sounds of the forest around them.

After both had had their fill, Big Mac stood up to pack everything back up, when suddenly he felt something against his nose. He had just enough time to look up at Sugar Belle’s smiling face before she shouted, “Tag! You’re it!” and took off, giggling the whole time.

Big Mac looked confused for a second, before a grin broke out across his face. “Oh, yer in for it now! Come here!” Chasing ofter her, the pair ran around in circles around their picnic sight, laughing and giggling like a pair of school ponies after sneaking out late at night for a date.

Eventually, Big Mac managed to catch up to waddling mare, playfully pinning her to the ground as he whispered into her ear, “Tag, yer it.” Grinning devilishly, he leaned down and began to lightly nibble along Sugar Belle’s ear, causing the mare to gasp from the contact.

“Bi—Nana! That’s not… that’s not how you play tag!” Wiggling underneath Big Mac, Sugar Belle somehow managed to free her ear from Big Mac’s grasp before flipping them both over, the pair rolling around on the grass for a moment before they finally came to a stop, only now Big Mac was lying on his back with Sugar Belle standing over him, her grinning face staring down at him.

“Tag,” she said as she booped him on the nose a second time, “You’re it.”

“Alright, alright, ya caught me…” Big Mac remarked as he looked up into Sugar Belle’s eyes. “I think y’all deserve a reward for that one.”

“And I know just the thing…” Sugar Belle said as she leaned down and pressed her lips against Big Mac’s, Big Mac returning the kiss as the world seemed to fade away around the two lovers. In that moment, all that mattered to them was each other, and no force in Equestria would be able to stop them.

Well… except for their need to breathe, as the two only pulled away once they finally needed to catch their breath, both gasping for air as their lips separated. Rolling over, Sugar Belle flopped down next Big Mac, her dress train riding up to reveal her diaper to the world, but Sugar Belle couldn’t really find the effort to care as she lay beside her colt friend, staring up at the sky as a family of birds flew above the treetops.

“Hey, Big Mac?”

“Hmm?” Turning his head slightly, Big Mac glanced over at the mare beside him. “Yeah, Sugar Belle?”

“I… I just wanted to thank you for… for all this,” she said, gesturing at herself. “Getting to spend this time as… as your foal, with you looking after and caring for me… it’s everything I’ve ever dreamed of happening and more.” Sighing contently, she added, “I feel like the luckiest pony in Equestria right now for having someone as understanding as you beside me.”

“Well, I’d say that makes two of us, then,” Big Mac replied, smiling as he looked back up at the sky. “I was so ashamed and embarrassed about wanting to dress up like a mare, and yet you accepted me without so much as a second glance. There’s not a pony in all of Equestria that I’ve felt more comfortable bein’ myself around than you, and I thank y’all for it.”

The two ponies were silent for a moment longer before Big Mac added, “I love ya, Sugar Belle.”

“And I love you too, Big Mac.”

Nothing more needed to be said at that point as the pair laid there, two of the happiest ponies around for miles.