Big Macintosh was sitting on his bed with the thick diaper between his legs blushing a little. All the while his sister was walking back and forth grumbling and growling under her breath. “I can't believe that you're acting like a little foal! This must be the work of the curse Twilight was going on about.”

The big stallion chuckled and shrugged. “I mean yeah it could be just that...I’m not sure I just felt like putting on diapers one day and just kept on doing it. It helps me relax after a long day at work."

Applejack shook her head and poked the diaper with a hoof. “We really need ta get this under control. The last thing ya need is somepony seeing ya in this.”

He crossed his hooves and scoffed, “I wouldn’t just do that! Heck, I was hidin’ it from ya because I know ya wouldn't understand.”

Applejack turned around and asked. “It’s one thing if ya was doing this and ya just trying to relax in your own way. But if your hearing voices in your head then we need ta get ya to Twilight as soon as possible.”

Big Macintosh stomped a hoof and growled, “ya dun need to do anything like that! I ain’t no little foal, and I really don’t need Twilight’s magic for nothin’.”

Applejack stomped her hoof back and groaned, “ugh you're more stubborn than a mule and that's coming from me! I’m gonna go grab Twilight, and she’s going to fix you up or so help me I’m gonna buck you!”

The angry farm mare then went out and slammed the door behind her while Big Mac pouted and brooded sitting on his bed with hooves crossed over his chest looking down at the mass of white padding that poofed between his thighs. The voice then entered his head, that’s right how about we go and show off you're a big colt, and you don’t need Applejack!”

Big Mac stood up and ruffled his big diaper. “That’s right I’m not scared of anypony! I’m going to show off my diaper!”

The voice whispered, yes that’s right you go show off that big thick diaper of yours it’s super adorable.

Big Mac blushed he was never called adorable and to be honest it felt kind of cute. He stood up with his back hooves spread out by the thick padding and waddled off down the stairs with a considerable strut. He continued to wiggle through the house with a thick diaper shaking about making a loud rustling noise from the diaper. He poked through the door and opened up to Ponyville. Big Mac whimpered a little, and he could feel his hooves shaking, but the voice entered into his mind, don’t be scared you love diapers and everypony will see that now go out there and show the world how adorable you are!

Big Macintosh wiggled out of the house and went into the streets shaking his big padded rump proudly with his thick diaper shaking back and forth. Ponies all overlooked with awe and confusion at the giant red stallion strutting around in a thick diaper. Many ponies whispered and pointed at Big Mac seeing that Applejack acted odd only a few months earlier. Many were whispering if that something was happening to the Apple family. But the happy stallion seemed to not care at the strange looks and was actually enjoying the attention waving a hoof at the ponies as he walked by. The voice continued to enter his mind, aww look at you waddling proudly in diapers your like a three-year-old.

He blushed as he whispered, 'three..yeah...I don’t have a lot of memories from that age...I...in fact I wouldn’t mind reliving those years just so I can have memories of them."

The voice persisted and cooed, “yes I bet you would now let go and relax ease that big pony mind of yours. Remember when you didn't have any responsibility when all you knew was the love of ponies taking care of you. Remember how proud you are of that big diaper your wearing.”

Big Macintosh smirked and wiggled his diapered tush. “Yeah, I love diapers especially these ones keeping my rump warm and keeping me from going potty on the floor.” He squeaked out loud hearing himself say potty like a toddler.

The voice whispered in his head, ”that’s right you are only three years old after all.”

Big Macintosh thought for a second plopping down on his thick diaper…three…was he really only three years old?

He looked down at his diaper and thought to himself, but by three I wasn’t fully toilet trained?”

The voice laughed, guess not, seems your still in diapers little toddler.

Big Mac squealed as he jumped up and down in the middle of town shouting, “yeah I’m a toddler who loves his diapers!”

He didn’t notice right away that everypony in the vicinity was now staring at him with confusion. Some smirked and chuckled at the stallion’s antics, most though were concerned watching the well known stallion acting in such a odd way. He stopped bouncing and looked around at the crowd of ponies and waved a hoof and babbled. “Hello, I Big Mac and I three years old? Can somepony help me find my big sissy Apple Bloom?”

As Big Mac was acting a like a toddler in front of everypony in Ponyville. Applejack was walking back and forth in Twilight’s library where the purple unicorn sat on a desk taking notes and studying a book on possession and spirits. All the while Applejack continued to explain to her friend regarding her brother. “So yeah what I’m trying to say is that think I figured out that the spirit you were talking about the one that possessed me, I’m sure it possessed my brother.”

Twilight closed a book she was reading and looked up at her friend with a concerned look and asked, “I need more details what’s it doing to him exactly?”

Applejack turned with an angry glare. “I told you he’s acting like a big baby! He’s wearing diapers and drinking out of a big foal bottle. Heck, I think he’s playing with some old rag doll.”

Twilight gave the nod and whispered, ”the spirit must have used the doll as a medium this time...do you have details on the doll?”

Applejack growled under her breath. “Well it’s your doll, it’s the one you put a "want it need it" spell on driving half of Ponyville crazy.”

Twilight cringed as the memories of that incident which were still raw. She turned around with a sheepish smile. “I’m so sorry, I’ll get to him right away, he’s still at your house right?”

Applejack gave a nod but nervously scratched the back of her head as she explained, ”yeah he’s uh a bit upset about how I burst in on his private time.”

Twilight got up slowly and whispered with tension in her voice. “Oh dear, well hopefully he isn’t too upset about everything. I’ll just explain things, and hopefully, we can get him to reject the spirit before it makes him do anything thats embarrassing.”

Applejack rolled her eyes and scoffed at the notion. ”There’s no way he would walk outside in diapers. I mean heck even if he likes wearing them there’s no way he would do that in public.”

Big Macintosh was proudly bouncing up and down in his diaper giggling like a little foal. All the while ponies were laughing him. Big Mac continued bouncing and shaking his diaper thinking they were liking his little show. Luckily, a reluctant Cheerilee who was out getting some school supplies for her students came forth from the crowd and asked in a sweet but concerned tone, ”hey Big Mac what’s wrong why are you acting like this?”

The big red-coated stallion stopped bouncing in his diaper and raised his hooves in the air and exclaimed. “I’m a big baby. I’m just super happy because of my new diapees!”

Cheerilee sighed seeing that Applejack acted the same way not too long ago and thought to herself. Apple Bloom is having a hard time dealing with her sister this way not to long ago. This is too much for one young filly. Cheerilee came up and sweetly cooed, ”look, sweetie, we need you to go and get some help now come on.”

Big Mac got up and waddled after Cheerilee with two big innocent puppy dog eyes he asked, ”are we going to my big sister Apple Bloom?”

Cheerilee shook her head and explained, “No not right now she’s at school, we can visit her later.”

Big Macintosh shook his head and stomped his hooves, “no! I wana see her now!”

Cheerilee scolded him as a mother would to a disrespectful foal. “No Big Mac, you listen or...no ice cream got it?”

Big Mac’s ears perked up at Ice cream and started to jump up and down with his diaper bouncing along with him shouting, “I want ice cream! I want ice cream!”

Cheerilee looked around seeing many ponies bursting into fits of laughter. Cheerilee gave a big sigh and whispered, “okay Big Mac we’ll get ice cream after we see Twilight okay?”

Big Macintosh stopped bouncing and nodded, ”otay Cheerilee I go see Twily.” She then led him off towards Golden oaks library watching his giant diaper bouncing up and down. Cheerilee just gulped and nervously whispered, “hopefully she’s not to busy. ”

But as they passed the schoolhouse Big Macintosh’s face lit up and he shouted, “Apple Bloom is over there! I wana go say hi!” He sped off towards the school as Cheerilee ran after him and shouted, ”hey Big Mac stop!”

But he didn’t listen with his foalish instincts wanting to see his big sister Applebloom. He burst into the schoolhouse. But as he did so every student in the classroom looked up from the test they were taking and stared at the big hulking padded stallion. Some of the students burst into fits of laughter as Big Mac whimpered scrunching his diaper with his back legs. Then out of nowhere a loud hissing noise echoed throughout the classroom. The stallion squealed feeling the hot urine flow into the innereds of the padding. He scrunched his diaper with his back lges again but this time the soggy padding made a loud squelching noise as he pressed his legs together. Every foal in the classroom all roared with laughter at the stallion who just peed his diaper. Big Mac started to tear up and whined, "Apple Bloom I pee pee in my diaper need a change."

The class was stunned, and Apple Bloom was just mortified at what she was seeing. She already had to deal with the fact her sister acted like a filly a few months ago, and now her brother is acting like a big foal.

Apple Bloom slowly got up from her desk and whispered, “look uh Big Mac this isn’t a good time I’m taking a test.”

He shakes his head and stomps around "I need a change from my big sissy and My name, not Big Mac, it's Baby Mac."

Every foal in the classroom was now on the floor doubled over from laughing as Apple Bloom shoved her hooves over her eyes. "My life...it’s over..."

Cheerilee finally entered the classroom and stomped a hoof then shouted, “that’s enough!”

Everypony stopped laughing instantly as the teacher strolled to Apple Bloom and whispered, “I’m so sorry I tried to stop him.”

Apple Bloom looked down with embarrassment and shame. She slowly got up from her desk and trotted over as she sighed, “it’s alright, I’ll take him home if that’s okay.”

Cheerilee nodded and whispered, “you can take the test tomorrow. Go on and help your brother.” Apple Bloom went over to her brother and grumbled, “come on...uh Baby Mac let’s get you changed.”

He smiled and trotted off behind his sister proudly shaking his thick diapered rump back and forth.