Although she still hoped to find a cure for the magic muffins Discord had left behind, Twilight joined Rarity and Derpy in watching the huge group of foals. Things were going smoothly, it had already been two days. Pound and Pumpkin Cake as well Pinkie Pie, were looking over Dr. Whooves as he teaching Blueblood about shapes and colors. He showed them a circle block. "See? Tis is a circwe, it has no sides and is wound."
The two ponies oohed as he continued, picking up a triangle. "Tis is a twiangwe. It has thwee sides, see?" He then started placing the shapes in the holes as the foals looked up in wonder.
Hoity Toity opened his mouth and shouted. "Wow! I fowgot my shapes Is so cool to we-wearn. So, wha is a squawe again?"
Dr. Whooves picked up the square block. "Tis is a square, it has fouw sides. A wectangwe is a squawe tat is wider tan it is taww."
The colts oohed as Pinkie Pie rolled her eyes. "Ugh, tis is so bowing! We onwy babies, we dun need pweschoow stuff yet. I know my shapes and cowows."
Dr. Whooves turned around with a pout and plopped on his diaper making it crinkle as he babbled. "Ya dun need to weawn this stuff since ya gonna be a aduwt again soon.”
Pinkie rolled her eyes and pouted, she then turned to see Rarity was in the back of the nursery watching the foals with intense scrutiny. She then scoffed. "You know wha? I tink tat it wouwd be gweat if we did someting fun befowe Dw. Whooves and I tuwn back into big ponies again."
The foals giggled as Blueblood looked over and replied. "Yeah, tis is gonna be so coow! Gwad ya tinking wike us! So what awe ya tinkin?"
Pinkie smirked as she replied. "Weww, I bet tat thewe awe some sweets we can get into in ta kitchen."
Dr. Whooves waddled over. "Ya tink, I just gonna wet ya go on a cookie heist? Not in a miwwion yeaws!"
Pinkie Pie bounced in her diaper, poofing confetti out of her leg holes as she shouted. "Oh come on, Whoovesy! It'ww be so much fun!"
Hoity waddled over in his thick, crinkling diaper. "Yeah, it sounds wike wots of fun! But we needs to sneak by Wawity, ten Dewpy and ta Cake Twins downstaiws. And we can’t fowget Twiwight."
Dr. Whooves crossed his hooves and grumbled. "I dun know…"
All the foals pleaded together. "Pwetty pwease?!"
Dr. Whooves looked over the foals giving him puppy eyes and blushed as he scrunched his diaper and relented. "Fine, I helw ya out, but we need to distract Wawity fiwst."
Blueblood snickered as he eyed Rarity. "I gots an idea to distwact hew, ya better save me some sweets! I going in!" Then he waddled over towards his mom. He waddled along, shaking his padded rump adorably as he tugged on Rarity's tail and giggled.
She turned around and dawwed. "Aww, Blueblood, what are you and your friends up to? You were talking for a while back there. Are you planning to get into trouble again, mister?"
Blueblood snickered as he plopped onto his belly, rolled his legs up and cooed. "Nu-uh, is noting, Mama. I just wanna say I wuv you!"
Rarity dawwed as she bent down and nuzzled Blueblood, booping him on the nose. "Oh stop trying that. You always want something. What is it? If it’s the big pony potty, the answer is still no. I don’t trust you not to fall in."
Blueblood curled up, scrunched his diaper even more, and told Rarity. "Well…I just wanna pway with ya. Ya give me a tummy bwow, ya awways good at tose."
Rarity couldn't help but nuzzle her son as she gave him raspberries into his belly, making Blueblood squeal in laughter and squirm about. She had no idea that this was exactly what Blueblood had planned.
The other foals slowly walked down the stairs while Rarity was busy playing with Blueblood, and saw Pound Cake and Pumpkin Cake. They were giving food to the many ponies sitting at the tables (and waddling about in their diapers, they weren’t quite at the level where they could be undiapered. Plus it would ruin their cover) while Derpy was standing behind the counter.
Derpy was smiling as she was giving cupcakes and other pastries to the ponies who ordered them. The foals all gulped as they looked over the room, trying to figure out how they were going to get into the kitchen. Especially since there was still no sign of Twilight.
Hoity came over and whispered. "I'ww distwact Dewpy whiwe ya guys go into ta back woom. Save me some sweets."
Then Hoity waddled over, and Derpy looked down with a smile. She then nuzzled the little colt and cooed. "Oh, hello. Hoity Toity! What are you doing down here, little one? I thought your momma was upstairs."
Hoity smirked as he babbled. "I just hungwy, can I get someting ta eat?"
Derpy looked over and gave the colt a pat on the head. "Certainly, cutie! Come on, let's get you some foal food in your tummy." She took the little colt by the hoof and led him away as the other foals snuck into the kitchen.
They looked up at the giant robot that was busy making pastries. Miraculously, it was still operating just fine despite its creator being too small to repair it.
Pinkie then took out a tray of muffins that were just lying nearby. Dr. Whooves eyed them and asked. "Hey, whewe did tose come fwom? I dun think my machine made tose."
Pinkie shrugged and looked over them. "I bet they pwobabwy otay. I mean, tey just muffins."
Dr. Whooves was unsure about the whole situation and shook his head. "Didn't muffins tuwn ya into a foaw? We should pwobabwy give those to Twiwy to be safe."
Pinkie smirked as she then took a piece of one of the muffins. She had a rather naughty idea. "Weww, wooks wike I gots to test it and see if tey do got chaos magic in tem. And if I can’t eat tem, I know whewe I can put tem!" She eyed the baking machine.
Dr. Whooves tried to stop Pinkie, but was too late as she threw it into the machine! Dr. Whooves gasped as the muffins were absorbed into the cylinder machine, and it then slowly became a pink pastel in color as a frilly white apron formed around its base. More mechanical arms came out as it scanned Dr. Whooves. "Identified: Three-year-old colt, hasn't eaten in three hours. Proposal: Some foal food should be eaten." It spoke in a voice that sounded feminine (almost like a nanny, you might say).
The little colt didn't wait for the machine to make up its mind and began to scamper off! But he didn't get far as the arms took hold of the squirming Dr. Whooves, making his diaper crinkle and he squealed as a bit of pee leaked into his diaper from all the excitement. The machine didn’t seem to notice the small damp patch that was forming, as it placed the embarrassed Dr. Whooves in a highchair and revealed a jar of foal food. It started to feel him glops of the orange mush, which was a mix of mashed carrots and yams. And he could hear Pinkie Pie laughing. "Stop it!” He protested. “Pinkie, ya gonna be in big twoubwe fow tis! Ya gonna gets a spankie fow suwe!"
The little filly just laughed as she waddled off outside, meanwhile the machine continued feeding Dr. Whooves. Unknown to either of them, it then started to produce more pastries at the same time with a mix of the magic-infused muffins.
Pinkie Pie was now outside and smirked upon seeing Derpy. "She couldn't resist a muffin even if it has chaos magic!" She thought to herself. “It’ll only be for a little longer than Dr. Whooves and I are foals. Twilight can change her back to normal when she finds that cure she’s gotta be close to finding.”
The mischievous filly quickly scampered over and placed one of the magical muffins near Derpy. Pinkie then spotted Twilight wearing a safari outfit with binoculars as she documented Pound and Pumpkin Cake doing their duties. No doubt it was for research (probably on how big foals behaved). Pinkie crept over and placed a magic muffin near Twilight then she quickly climbed upstairs, laughing. "Oh, tis is gonna be fun! Maybe I can do tis aftwe evewyting’s back to nomaw so the twins have mowe pwaymates."
Derpy looked over at the odd muffin, and her stomach grumbled as she picked it up and began chewing on it. She suddenly started to shrink slowly as her body became chubbier. She squealed upon seeing the floor was now closer and gulped. “Uh oh! Tat was a chaos muffin! Is not good!" The little baby Derpy was a bit unnerved, unsure of what to do, when she saw Twilight about to eat her muffin. The little filly gasped as she tried to waddle towards Twilight and cried. "Stop! Dun eat ta muffin!"
However, Twilight just heard foal babble and casually took a nibble of the muffin as she looked over to see the odd looking pegasus filly. "Huh, a baby pegasus? Where did she come from? I didn't see one enter the shop. But she looks familiar..." She then groaned as she started to shrink, but she noticed she was still taller than the pegasus and asked in a childlike voice. "Wait, what happened?! My voice!" she touched her throat and gasped! "I...I sound like a school filly!” Then she looked around and gasped! "My cutie mark, it’s gone! Where's my cutie mark?!"
Twilight then saw a school bag somehow magically appeared on her back with her cutie mark now printed on it. "Huh, that's weird. Some of the magic muffins are clearly still around!" A look of horror crossed her eyes. “Oh no, Rarity! Got to warn her before it’s too late!”
Twilight scampered up the stairs with Derpy on her back, as she entered to the nursery where Rarity was now a school filly as well, with a school bag with her cutie mark printed on it too, chasing Pinkie Pie. "You get back here! I may be a school filly, but I'm still older than you! I don’t wear diapers, thank Celestia for that!"
Twilight stomped a hoof! "Rarity, what happened?! You were supposed to watch the foals!"
Rarity turned towards her friend and cried. "I was! But Pinkie pie and Dr. Whooves both just escaped! I didn't know they were using magic muffins to regress ponies. Heck, I didn’t know the magic muffins were still around."
Twilight stomped over. "You weren't paying attention! How could you let them outsmart you when you’ve been raising two foals all on your own?! Now look at us, we're no older than the Cutie Mark Crusaders! Heck, we sound just like them!"
Rarity scoffed. "There's no way I'm going into some rundown tree house and getting icky tree sap all over my coat. Honestly, I don’t know what those girls get up to half the time, but it’s making me worry. I was never that adventurous as a blank flank."
Twilight rubbed a hoof down her face. "That's not what I meant, Rarity! We sound and look like them, but we're not them. Like with the foals and the twins, we still have our normal minds. In any case, we need to close the shop and find any trace of the magic muffins before more ponies turn into foals! We were lucky, there must not have been enough magic in our muffins to fully regress us. But the next batch could turn anypony who eats the muffins into a foal like Pinkie Pie!"
Then they all heard crying, wailing and giggling downstairs. They scampered down to see that every single patron in the shop was now either a baby foal or a school foal. Pound Cake had luckily already flipped the sign from “Open” to “Closed” and Pumpkin Cake was gathering up the foals up, trying to quiet them.
Twilight and Rarity entered the kitchen and found the baking machine rocking Derpy Hooves with a bottle of milk in its mouth. The machine turned its attention to the fillies and scanned them as it replied in its nanny like voice. "Two eight-year-old fillies detected, it's about four in the afternoon. Proposal: Snack Time." Mechanical arms popped up out of its body and the fillies ran straight for the machine as Rarity shouted. "Doctor, how do you shut this infernal thing off?!"
Dr. Whooves whined through the bottle he was drinking. "Pwess the wed button!" Twilight scampered over and slammed herself into the button, shutting the machine down as it powered off. The fillies looked around and helped Dr. Whooves up as he shouted. "Whewe is Pinkie Pie?! She’s in so much twoubwe! I can’t beweieve she’d do tis!"
Twilight sighed. "Look, we can worry about that later. I’m sure Pinkie Pie didn’t mean for things to get this out of control. For right now, let's get all the foals accounted for and find out who they are, as well as what we’re going to do with them."
The group nodded as they went into the leading parlor of Sugarcube Corner to help the Cake Twins.
A short time later, all the foals were in the middle of the Cake Twins’ nursery, running about and playing. Twilight accounted for all of them and concluded that they had eight little baby colts, including Caramel who was wearing a thick diaper and sucking on a bottle of milk. For the baby fillies: Nurse Redheart was now one of them. For the younger school foals, six were colts with one being recognized as Filthy Rich, now playing with a toy cash register. While among the school fillies, Twilight recognized one as Cheerilee, playing school with a bunch of dolls.
Twilight and Rarity could only look with worry and turned to see that Pound and Pumpkin cake as of now were the only actual adults in the room, and they were just foals in adult bodies!
Rarity could only whisper. “What do we do, Twilight?!"
Twilight whispered. "I have no idea, but Pound Cake, Pumpkin Cake, you two look the most grown up. I’m afraid we don't have a choice at this point. We're going to have to free Discord and get him to transform these ponies back into adults, but until then you two are in charge."
The twins both gave each other nervous looks as Pound asked. “H...how wong untiw ten?"
Twilight sighed. "Not long, hopefully. But we need to act fast, we can't wait any longer! If we don't do something soon, Sugarcube Corner is going to become Sugarcube Daycare."
Pumpkin Cake turned to Twilight and chirped. "Dun wowwy, Twiwwy, we'ww take cawe of tings hewe. At weast now we dun have any othew big pony tings to wowwy about, we just gots to take cawe of the gwown-ups wike tey us. Is wike we pwaying house."
Twilight then scampered off as Cheerilee asked. "Um, I have a question. Since I'm a school filly, right now school is starting. Who's gonna run my classes?"
Nurse Redheart looked up and babbled, "I gots appointments for wots of big ponies. Who gonna covew fow me?" She then showed off a teddy with a bandaid on its belly.
Filthy Rich looked up from his toy cash register and commented. Uh, also, nopony is runnin’ my store. I can’t exactly ask Spoiled or Diamond to do it for me when I’m like this, they’ll never take me seriously."
Pound Cake came over and explained. “Weww, fow now, ya wittle foaws. not sure if is ta best option to have you do big pony jobs as you awe now."
Cheerilee blushed, looking at herself in the mirror. “Yeah, I guess the students won't take me seriously like this. They’d probably treat me like those flour sack dummies for the foalcare assignment."
Pumpkin Cake then came over. "Wook, I suwe tings wiww be fine eventuawwy. Just pway fow now, and if you need anyting wet us know. We’ww twy to pwovide it." The foals nodded and ran off, playing their games.
Meanwhile, Pinkie Pie was in what used to be the twins’ crib with a magic bubble surrounding her. She shouted. "Hey, wha about me?!"
Pound growled. "Ya in timeout until Twiwight comes back. Even as foaws, we nevew did anyting this naughty! You wucky Mommy and Daddy not hewe to see tis."
Pinkie looked down and whimpered. "I sowie I thought it wouwd be more fun with more foaws. I didn’t mean to wegess evewypony."
Pumpkin just sighed. "Wook, it'ww only be a few more houws. Ten tis aww goes back to being nowmaw."
Pinkie just sighed. “Alwight, guess I did go ovewboawd….I hope I didn't mess things up too bad. I just wanted mowe pwaymates,” Then she noticed the twins checking each others diapers. She realized they still had the special potty clock ones that Dr. Whooves had given them two days earlier. But come to think of it, she hadn’t seen them go into the bathrooms downstairs. They’d always gone upstairs, despite the fact that it took longer to do so. She could only think of one reason why they would do that. “Hey, you two stiww not using ta big potty, awe you?”
Pound and Pumpkin reluctantly nodded in confession. “Even when Miss. Dewpy was awound, we not feew safe using it,” Pound explained. “If Hoity Toity and Bwuebwood could get fwushed, how do we know tat not happen to us?”
Pinkie groaned, putting a hoof to her face. “Sewiouswy? You stiww wowwied about tat? I towd ya it not scawy, it just wan to be ya fwiend!” Then she got an idea. “If you two wets out of this bubbwe, I pwomice I’ww behave. And I’ww show tat the big pony potty is totawwy safe and wun huwt ya. Ten you two gots to stawt using it so the twaining potties can be used fow actuaw wittwe ponies. Otay?”
“Otay, big sistew. But ya pwomiced, so no going back on ya wowd.” Pumpkin declared as she lit up her horn. She struggled to make it spark and undo the magic bubble.
Pinkie just grinned, stepping out of the bubble and popping it with her hooves. “I couwd’ve gotten out at any time. But if I did it whiwe Twiwght was hewe, she’d put me back in it and punish me mowe,” Then she told the twins. “Now come on, ya know whewe the big potty is.”