"Thanks for agreeing to look after the twins again, Pinkie Pie," Mrs. Cake sweetly replied to the party planning pony. "You're a real lifesaver!"
Pinkie just waved a hoof and chriped with a smile on her face. "Oh, it's nothing. I think they enjoy spending time with their favorite big sister."
"We'll be back as soon as we can, but probably not until tonight at the earliest," Mr. Cake urgently declared as he was rushing to pick up some boxes. "Don't wait up for us, if it's getting late be sure to bathe them and put them to bed. Also make sure to keep an eye on the two. We don't need them getting into the bakery again."
"No worries, Gummy and I can handle it!" Pinkie gave a salute as the baby alligator nestled into her mane. "Pound and Pumpkin Cake are in good hooves with me. You go fill that catering order for that huge wedding reception. I'll make sure the twins behave themselves." She finished the last line with a knowing wink.
Mrs. Cake smiled. "Okay then, see you tonight, hopefully. Be sure to tell my children I love them."
"Come on, sugar plum, we've got to get going! We're going to be late!" Mr. Cake urgently called to his wife.
The plump baker departed. "I'm coming, honey bun!" She took one last look at Pinkie. She found it kind of odd that the party pony hadn't wanted to come to the wedding reception and had instead insisted on staying behind to foalsit the twins. Come to think of it, she'd been declining to go to a lot of parties recently.
But assuming that was something to be concerned about, Pinkie wasn't showing any signs that she was up to anything. Mrs. Cake dismissed it simply as Pinkie being her natural, Pinkie self. Sure, she was weird, but that was just what Mrs. Cake and her husband loved about Pinkie. "She's always felt like more than just an apprentice. One of these days we really need to talk more about the special connection we share." She thought, before the plump baker joined her husband and together they departed Sugarcube Corner. Huge boxes of sweets following behind them on a cart.
Pinkie watched and waited until the Cakes were out of sight. "Good, the coast is clear," She said to herself and locked the door. "Oh, Gummy, I've been waiting such a long time for this! Finally, all my waiting's going to pay off! Just gotta check on the two most adorable foals I've ever seen, then I've got all the time in the world to myself!" She bounced happily upstairs to the nursery, humming a little tune to herself.
Pound and Pumpkin Cake were sitting in a playpen in their nursery, babbling while playing with some of their favorite stuffed animal toys.
Pinkie bounced into the nursery, a shower of confetti announcing her arrival! "Hey you guys!" She happily declared, trotting up to them. "Guess who's foalsitting you again?!"
The twins both giggled with glee as they pointed their hooves at Pinkie.
The pink party pony smiled, scooping them up and hugging them. "Yesarooni, it's me! Oh, you two are so smart! Seems like only yesterday your parents were bringing you home from the hospital!" A faint sniffle escaped from her lips. "You're growing up so fast, you know that? You barely even need diapers anymore. In fact, pretty soon you probably won't need them at all. You'll be in preschool, maybe even kindergarten. Gosh, the time does fly! I wish you two could stay your adorable little selves forever, but you can't."
The twins giggled as they waddled across the nursery towards Pinkie. The Cake Twins babbled incoherent gibberish at each other. They both nodded then they both waddled across the nursery in their diapers, making them crinkle. Pinkie Pie dawwed as she then took the two foals into her hooves and nuzzled them with a smile on her face. They knew from experience how to prevent their big sister from getting all gloomy and frowny faced.
Pinkie set them back down a few seconds later. "Just let me know if you need anything, okay?" The twins nodded their heads.
Pinkie smiled and breathed a sigh of relief. Now there was just one thing left to do before she could try out her little private fantasy. The pink coated mare zipped downstairs to make sure there was nothing cooking in the ovens or on the stove. She made sure the sign was flipped from "Opened" to "Closed", and she checked every nook and cranny to make sure nopony was around.
There wasn't a grown pony in sight, the coast was clear! So, eagerly grinning from ear to ear, Pinkie bounced back upstairs. Good thing she'd planned ahead in anticipation of this alone time. She'd made sure to hide everything in a place where nopony would ever think to look. Inside the twins' nursery, the young mare bent down and opened a secret compartment underneath the changing table. It was where all the pacifiers were stored.
With the twins distracted by their toys (and now being completely naked, even though they didn't wear clothes), the party pony dug around in the drawer for a little bit. She soon found what she was looking for as she pulled out a pacifier. It was similar in color to the one Pound always liked giving to Gummy for some reason, except the size left no doubt as to whom it was intended for. It was way too big to fit into Pound's mouth, but it was just the right size for a fully grown pony like Pinkie Pie.
Grinning from ear to ear, Pinkie popped the pacifier perfectly into her mouth. The rubber bulb bobbed up and down in her mouth as she gave it a few suckles. "This is pretty nice. No wonder babies always have them." She thought to herself. But the pacifier was only the first step.
Closing the pacifier compartment, Pinkie opened up the drawer immediately above it and to the left. An entire pack of just opened Silly Filly brand diapers greeted her innocent blue eyes. She took one out from the drawer, it was quite adorable with the padding a pristine white with little pink balloons printed all over the padding as wetness indicators, along with pink tabs and frilly pink leak guards lining the outside of the diaper. Pinkie Pie trailed a hoof down the diaper feeling the padding's soft fabric with a hoof and hearing it crinkle made her tingle with anticipation to try it on. Then she set it on the ground. It was definitely not going to fit her, at least not in its current size. But the twins barely needed them anymore, so it wasn't like they'd miss one. Mr. and Mrs. Cake could always buy more.
"Now where did I put that thing?" Pinkie thought out loud as she dug around in her mane. She stored so many things in there in case of particular emergencies, and the one time she actually needed something it seemed to be impossible to find. At last, she was able to pull out a small air pump. Carefully, she inserted the hose into the back of the diaper and started to press down on the pump. The diaper became filled with air and started to grow! It grew bigger, and bigger, and bigger! The diaper was now four times its size. With a curious hoof Pinkie Pie poked the diaper and felt it sink into the plush material followed by a symphony of crinkling.
Pinkie chuckled to herself. "That should be thick enough, thankfully from what I was told I wasn't that much of a heavy wetter," The mare then ceased pumping and removed the pump's hose out of the diaper and after putting the pump away back inside her mane, the mare picked up the now much larger, crinkly thick Silly Filly diaper. "Here goes nothing!" She declared to herself with a bright smile! This was it, the moment she'd been waiting months for!
Pinkie put her legs through the leg holes, and her tail through the tail hole. Her rear sank into the seat of the plush padding. The mare then took out a big pink bottle of foal powder from her mane and started to pour it all over her rump until her coat was now a powdery white. Pinkie gave a nod of approval. "Just in case, I'd rather not have a rash."
The pink coated party pony then slowly pulled the front of the diaper over her waist and then moved to fasten the pink tabs around her sides and sealed them down onto a giant, baby blue plastic landing zone with a satisfying crinkle. The diaper fit, just barely. But for now, even a tight fit was satisfactory for the party pony. She put a hoof to the padding and poked at it, watching it compress and crinkle audibly with foal powder poofing out. With the pacifier in her mouth, she felt just like an itty bitty little filly.
However, at that very moment, Mr. Cake happened to come walking back up to the nursery. He was unaware of what he was about to see. "Sorry to bother you, Pinkie, but have you seen my..." His sentenced trailed off as he took in the sight that greeted his eyes.
There stood Pinkie stacking blocks one on top of each other, wearing a Silly Filly brand style foal's diaper, a baby blue colored pacifier bobbing up and down in her mouth,
Pinkie immediately adopted the look of a deer frozen in a spotlight, she spat out her pacifier in shock and gasped! "M...Mr. Cake! I... I thought you were... I mean... shouldn't you be..." But her words failed her as the pacifier landed on the floor in front of her. She didn't even think to swish her tail and try to block the view of her embarrassing padding.
Mr. Cake was silent for a few moments as he looked over Pinkie very carefully, all the while not moving an inch.
Pinkie started to break out in a nervous sweat. Why did Mr. Cake have to come back?! Why did he have to be the one to see her like this?! What were he and Mrs. Cake going to do now that this secret was out?!
Mr. Cake finally opted to break the silence. "I'll... just, check somewhere else. It's not that important," He insisted as he turned to leave. "Oh, and Pinkie?"
Pinkie felt ready to make a run for it, her heart was beating so rapidly she swore it was about to jump out of her chest! "Yes?!" She reluctantly asked.
"Mrs. Cake is going to have to know about...this," Mr. Cake declared in what sounded like a serious tone. Pinkie gulped as the stallion then added. "By the way, you should probably pick up your pacifier. And maybe wash it, the nursery floor can get pretty dirty."