Fluttershy was humming as she was busy caring for her bunnies seeing them nestling with each other. She sighed “well it looks like all the baby bunnies have their burrows. But, now I have the rest of the day to do…well…something.”

The yellow Pegasus pondered what she will do for the rest of the day when out of nowhere Derpy Whooves of all ponies crashed down freaking the bunnies out making them bounce off a Fluttershy shook in terror hiding underneath her wings. Derpy slowly got up wobbling back and forth she then oriented herself shaking her head and hoofing a letter to Fluttershy as she explained, “hey Fluttershy sorry for the crash, I have an urgent letter from Applejack.”

Fluttershy was confused but to the letter and read it out loud.

Dear Fluttershy,

This is Applejack, and I’m sure your busy and all roundin’ up the baby bunnies. But this is urgent! Big Mac got himself acting like a big foal, and I need you to foal-sit while I try finishing up the applebucking. Please come by sweet apple acres as soon as possible.

Fluttershy blinked as she recalled some ponies talking about how Big Macintosh was acting oddly with wearing diapers acting like a big foal. She just whispered to herself, “so the rumors were true about Big Mac I hope he’s doing okay.”

The yellow Pegasus stored the letter away and exclaimed, “well I need to get to Sweet Apple acres as soon as possible. She instantly got up and fluttered off toward the farm as fast as her gentle wings would carry her. She fluttered for some time with a confused look on her face unsure of how to take the message she received from Applejack. It made her unsure of how to take the information. I have a lot of experience babysitting now considering I have foal sat the cutie mark crusaders and Spike. I’m sure Big Mac can’t be any more difficult. While lost in thought she squeaked coming short of hitting Applejack’s house and gasped in relief as she fluttered gently onto the porch. The nervous yellow Pegasus stood near the door hearing loud booms Big Mac laughing like a colt, and Applejack shouting. Fluttershy stood there sweating unsure if she should answer and slowly knocked on the door and whispered, “hello Applejack? I uh got your message.”

Upon hearing her Applejack opened the door with her straw yellow mane looking like a mess and her face had a look of being worn out with twitchy eyes and stains all over her coat. The farm mare instantly gave a sigh of relief upon seeing the yellow Pegasus and exclaimed, “thank Celestia you’re here! I was beginning to worry you wouldn’t show up.”

Fluttershy still quivering looked over her friend’s shoulder at the big foal and asked, “so um…how is Big Mac is he okay?”

The farm mare scoffed as she explained, “no, he’s far from okay!” She waved a hoof, and Fluttershy cautiously walked into the house and saw Big Mac sitting in the center of the living room in nothing but a clean diaper with the green apples printed on them for wetness indicators while he was playing with the giant foam blocks. The big foal was stacking them on top of each other only to knock them down with a foolish laugh clapping his hooves. Fluttershy dawwed at the scene and rushed over to cuddle the big baby as she exclaimed with glee. “Oh, he’s adorable! he was just like Spike when he was under that odd curse.”

Applejack just fixed her hat and explained, “yeah Big Mac’s kind of cute and all, but he is a hooful. Uh… thanks for coming out here on short notice. I hope this isn’t to much trouble.

Fluttershy who was pinching Big Mac’s cheeks and patting his thick diaper feeling nostalgia upon hearing the diaper crinkle. Fluttershy barely heard Applejack as she turned around and casually waved a hoof. “oh don’t worry this is a wonderful break from trying to round up a bunch of baby bunnies.”

Applejack gave another sigh of relief before she started a lecture on Big Mac’s needs. “Well, I know ya have experience with foals before, so I’ll go over the basics for a refresher. Big Mac here is just like any other baby, change his diapers, feed him bottles when he’s hungry, most importantly make sure he stays inside the house and out of trouble while I’m applebucking.”

Fluttershy snickered seeing how that’s the same rules for every foal she cared for that was still in diapers. The mare just sweetly replied, “oh that doesn’t sound too bad, I think I can manage.”

Applejack still concerned and unsure of leaving Big Mac alone continued to explain. “Just make sure he doesn’t do any bucking, and if ya need anything, I’ll be outside just given a holler.”

Fluttershy nodded and replied back, “of course, I’ll keep that in mind. Now you go along I got things here.”

Applejack started to slowly walk away taking a few glances back as she was still nervous. But seeing Fluttershy help Big Mac stack his blocks and keeping him engaged made her smile as she confidently walked out of the house and to the Apple family’s apple orchard. Fluttershy seeing that Applejack was finally gone turned to her charge and asked, “well now it seems that you are a baby now I have so many things planned, we can draw, make pastries, I’ll read you a bedtime story and then I can tuck you into your bed with your cute dolly.”

He looked up with a look of surprise and astonishment not really understanding everything Fluttershy said and just babbled, “yeah I a baby, I wana do all tat stuff ya said.”

Fluttershy giggled at Big Mac’s cute answer and asked, “oh really how old are you then?”

Big Mac shoved a hoof into his mouth and pondered the question a little before he exclaimed, “I three.”

Fluttershy dawwed, “oh your three! Well, I have to say your the biggest three-year-old I’ve ever seen.”

He squealed kicking about in his thick diaper making it shift about with his adorable waddle and ripple with every step as he proclaimed proudly. “Awesome! I ta biggest toddler ever!”

Fluttershy gave the stallion’s mane a pat and cooed sweetly, “yes you are now how about we make an apple pie?”

Big Mac started to jump up and down making the house shake as he screamed, “yeah can we make an apple pie!” Fluttershy hugged Big Mac's faced once more and ruffled his mane. “Oh, what a cutie.” She started to get out the supplies humming a tune as Big Macintosh started to grab the apples and began mashing them with his hooves shouting, “mash! Mash! Mash the apples!”

Fluttershy turned around in horror seeing the mashed glops of apple now spread out over the kitchen. “no Baby Mac that’s a no! no!”

The big red stallion turned around with a look of innocence on his face. “what are ya talking about? I mash ta apples as ya said.”

Fluttershy shook her head and in a condescending tone she explained, “No sweetheart we need to mash the apples like this gently.”

She took one of the un-smashed apples and began to mash it with a masher slowly. Big Mac watched with foolish intent the stallion’s eyes full of wonder gave the nod. “otay Fluttershy I wana try.” He tries his hoof on it as well and giggled and babbled with glee as he pressed his hooves into the soft apples. Fluttershy giggled and began to add other ingredients together into the filling. Big Mac continued to watch and help Fluttershy for some time both in making the pie filling and the pie crust. But as soon as Fluttershy was pushing the pie into the oven. Big Mac took the mixing bowl and started to shove the mixture into his mouth splattering it all over the kitchen. Fluttershy didn’t notice the mess that was forming until she looked around and saw Big mac eating out of the bowl and exclaimed, “big mac that’s a no! no!”

But the stallion continued to make a mess with glee splattering pie batter all over shouting “Pie! Pie!”

Fluttershy stormed over and swiped the bowl from his hooves as she scolded him. “That’s a big no, no Baby Mac you apologize.”

Big Mac started to whimper and began to wail as he bounded off making the whole house shake. Fluttershy chased him into the living room and gasped as Big Mac grunted and pushed a massive mess into his diaper making it bulge with a brownish color. Fluttershy groaned in disgust and stepped back as she whimpered, “oh dear, babysitting Big Mac is going to be a lot harder than I thought.”