While Cozy was being punished, Twilight decided to get some breakfast ready. She figured that with Starlight taking over punishment, she could at least try doing other things for the poor dear since it had been her idea to treat her as a foal. She could do things like give her bottles, burp her, change her diapers when needed, and maybe even play with some toys alongside her. That last one in particular felt kind of odd to her.
"Cozy Glow's not going to enjoy this, but how else are we going to reform her? At least this way she won't have to go to Tartarus, the poor foal would've gotten scared for sure. It just isn't right." Twilight said to herself as she levitated a bowl and some pancake mix over and began making some for her friends. She thought about serving them to Cozy, but decided against it. If she served those it wouldn't be much of a punishment. "Perhaps some fresh baby food will work, until she acts more mature anyway. Besides, I don't know what she normally eats. This way I can ensure she gets her nutrition." She thought to herself.
Spike walked into the kitchen while Twilight was in the midst of thinking. He had just put his restored comic on a shelf, now hopefully away from Cozy Glows' evil little hooves. "I actually wish I could've spanked her. I was supposed to be watching her, and it was my comic she ripped up." He remarked.
Then as he took a seat at the table, he also noticed an old looking high chair Twilight had brought out. In fact, it looked like one of his old ones and he cringed. "Twilight….. Did you really keep this old thing for all this time?" Spike inquired. Twilight confirmed with a nod. "W-why did you keep it? I know I used it a lot as a baby. I mean, you can even see some of the burn marks I left on it. Is this safe for Cozy to use? What if it breaks?" Spike asked while blushing deep red.
Twilight put the pancake mix down and cooed. "Why of course I brought it. I mean, I did bring some of your old stuff to my castle when I visited Canterlot a long time ago. I'm actually going to visit my parents later today to pick up a special surprise for little Cozy Glow."
"Yeah but did you rea-" Spike began, but was unable to finish his sentence as he saw Starlight Glimmer walk into the kitchen, holding a squirming Cozy with her magic.
Spike blew some smoke out of his nose as he saw Cozy Glow. After what she had done to his comic last night, he now didn't even want to see the naughty filly. She was a brat, plain and simple. "Let's talk about this later, Twi." Was all he said and sat down far away from Cozy Glow.
Starlight stretched her hooves as she brought in Cozy Glow. "Well, surprisingly she's still dry and hasn't made a mess in her diapers yet. But she can't hold it in forever, she'll go eventually. Worse comes to worse, some laxatives should do the trick," She declared as she used her magic, levitated Cozy Glow into the highchair, and strapped her in nice and snug. "There we go, Cozy. See what happens when you cooperate?"
Cozy stuck out her tongue. "Not like I had much choice." She rubbed her bottom with a hoof, still feeling the impacts from Starlight spanking her with the belt. Even Rainbow Dash's hooves hadn't hurt as much.
Twilight smiled as she finished making the pancakes and put two each on plates for herself, Spike, and Starlight. But she only gave Cozy Glow one. Since Cozy was playing the role of a baby, she wouldn't be able to eat a lot like the rest of them. Besides, it was a punishment. Every foalcare book said that parents had to set clear boundaries with their children and enforce them.
Twilight levitated each plate over to Starlight and Spike, and proceeded to put some syrup on top of the pancakes. She then got a fork to feed Cozy Glow.
However, in the time it had taken to obtain a proper fork, it seemed Cozy had already taken the liberty of trying to feed herself. As a result her hooves, stomach and parts of her diaper were all sticky and covered with syrup.
Naturally, Twilight was most upset. "COZY GLOW!" She bellowed at the top of her lungs. "You know the rules! Only big ponies are allowed to feed you, you are just a foal after all. Now look what you've done, you're a mess. And you're going to need a new diaper, I can't have you in a sticky, syrup covered one." She groaned, before she grabbed a few napkins and got them wet, then she went to wipe Cozy Glow clean. Of course that was easier said than done, Cozy kept wiggling about in the chair as Twilight cleaned her.
At least Cozy was rewarded for her efforts with a clean and a pristine diaper, much as she hated the undergarments for how thick and poofy they were. They made it impossible to ignore her current status.
Once Twilight had finished cleaning Cozy, she decided to get the foal a bottle (with tiny hearts printed on it) of milk. "There we go, I got a special drink for our precious little foal. You probably need something to wash those pancakes down." Twilight cooed as she brought the drink over. She picked Cozy Glow up out of the chair and put the bottle's nipple into Cozy's mouth.
Cozy Glow didn't really want to drink the milk. it wasn't bad enough that she'd already made a mess of her face, now she really had to go potty. Drinking the sweet liquid would only make her have to go even more. But unfortunately she couldn't do anything to stop it from being offered. So she ended up drinking it slowly. Once it was down her stomach, she was surprised to have Twilight pick her up and pat her back. What was even worse was that she actually burped as a result.
When she was set back down it was all she could do to keep from tearing up as she did the potty dance, trying her hardest not to let anything spill into her diaper. She knew she wasn't going to be allowed to use the bathroom. "That stupid potty chart! I should rip it up the first chance I get, just like I did to Spike's stupid comic! That'll get it through Twilight's head that I'm not some stupid baby!" She thought to herself.
"Oh, I see somepony's in a good mood. I'm so glad I could make you smile!" Twilight said as Cozy continued to do her little dance. She promptly picked Cozy Glow up. "Now, I know it's probably hard to use your diaper with everypony watching. So why don't I give you something to do to take your mind off that, and then you'll just do it naturally when you stop focusing on holding it in?" She offered.
Cozy Glow was then placed into a playpen near the kitchen, along with other toys, puzzles, and plushies. She desperately wanted to take her mind off of using the bathroom, still determined not to go in her diaper no matter how tempting it seemed and how easy it would be to do so.
So the diapered filly picked up some blocks and just spelled out various words as Spike, Twilight, and Starlight watched her play for a while.
After almost half an hour of playtime, Cozy appeared to be content and under control. So Twilight asked Starlight. "Starlight, I think I should get going to Canterlot. I gotta explain the situation to Celestia and Luna like I promised. Plus, I wanna visit my parents and pick up a few things for Cozy. Do you think you can handle Cozy while I'm gone? Or should I prepare a schedule for you?" Twilight asked as she leaned over the playpen and checked Cozy's diaper, which was of course still dry. "Hm. Could've sworn I heard a hissy sound, must be my imagination. I'm sure our little foal would tell us when she went. Can't imagine she'd want to get an ouchie diapee rash." She playfully teased while patting the foal's head.
Starlight looked at Twilight with confusion. "A schedule? Why would I need a schedule? I've foalsat the Cake Twins already plenty of times, even if they were already starting potty training by the time I met them. I know how to take care of this big of a foal. It should be easy, there's not much she could need. And unlike a normal foal, she can tell me if she needs something."
"Okay, but don't forget that this big 'Foal' tried taking over the world, and nearly succeeded too. Just try to be careful. And if you decide to take her outside at least be sure to keep a good eye on her, I wouldn't want her escaping from Ponyville. There's no telling what she might do if she did." Twilight replied and decided to just leave, bidding farewell to everypony and even giving Cozy Glow a small kiss on the cheek.
Cozy naturally detested such affection. Her parents were smart enough to stop doing that to her by the time she was three. "Stupid Twilight, stupid diapers, stupid everything!" She grumbled as she spelled "Twilight is dumb" with her blocks.
She eventually got bored of that and moved onto playing with her dolls, the very same dolls she'd taunted Chancellor Neighsay with. She grabbed a tiny cloth and put it on the Twilight doll, imaging it was a diaper. "Look at me, I'm Twilight. I'm a big, dumb pony who had to stop Cozy Glow instead of letting her take over the world. I'm such a poopy head, I have to spoil everypony's fun." She pretended to take her anger out on the dolls and made them fight each other.
Starlight simply observed the whole thing with frightening concern. Cozy's anger seemed to be getting worse and not better. "Well…. She's definitely still a little sore about losing, not that I blame her. But I'm sure she'll get over it eventually, right? I did, and so did Trixie. Ooh, I got it! What If I give little Miss Fussy Pants a surprise tickle attack? That's a sure fire way to get her to stop being so mean and nasty." She thought, not realizing Cozy Glow was trying her hardest to hold in her bladder.
Starlight sneakily trotted up the playpen and when she a few feet away from Cozy Glow she used her magic to pull the target close and began her tickle attack! "Surprise! You should've been watching your surroundings, Cozy Glow, because now you have to deal with a new monster…. The tickle monster!" She said proudly as she tickled Cozy all over her little body.
Cozy Glow was unable to do a thing. She just kicked her legs, failing to hit anything. "Hey! Get off me, you idiot! You're gonna make me pee!" She protested even as she couldn't help but laugh as Starlight started tickling her. Naturally, holding in her pee became a lot more difficult as a result. She held out at first, but then happened to notice Starlight levitate a feather. When she was tickled with said feather, her bladder was unable to hold any longer as she let out a huge surge of pee into her diaper! Her laughter was interrupted as a steady hissing sound could be heard!
As Cozy's diaper became full, Starlight finally got off her. When Cozy got up, her diaper sagged. "What the- Great job, Starlight you idiot! You made me pee my diaper, and I'm not even a foal! I'm so peeved!" She growled as her eyes narrowed, before Starlight grabbed her by the hoof and led her to the nursery, with Spike following them.
"First off, you are a foal until the punishment is done. Secondly, don't call ponies idiots, that's not very nice. And three, if you dare to say such naughty words in front of Twilight or I anymore, I'll have to scrub that dirty mouth of yours with some soap! Applejack and Rarity told me they did all the time when they raised their younger sisters. And even Pinkie Pie had her mouth washed out a few times growing up on the rock farm. The Pies are very strict about discipline, be thankful I'm not like them," Starlight scolded as she placed Cozy on the changing table and got a fresh, new diaper for her, this one had tiny, little purple hearts printed on it for wetness indicators. "Now, let's change the grumpy foal. We wouldn't want you getting a rash, would we? Twilight definitely wouldn't like that."
"Just shut up!" Was all Cozy said as Starlight prepared the stuff. Deep down she wanted to cry, but that would show weakness. Instead, she just laid there. "Wait… I've got an idea!" She thought with a grin. "When Starlight removes the diaper, I can make a run for It and escape! Those poofy diapers have been holding my wings down, so with them off I can get out of here without a problem!" And so she waited for Starlight to remove the diaper so that she could set her plans into motion. They were going to regret ever thinking they could get away with humiliating her like this.