The rest of the day passed uneventfully for Twilight and Cozy Glow, aside from the occasional diaper change. No other students entered into the headmare's office, Twilight worked like clockwork to get everything done that needed to get done and Cozy reluctantly occupied herself as best as she could. "I hate the fact that I'm starting to get used to all of this," She thought to herself. "And what's even worse is that I have to put up with this all month long before I can get the princesses to send me to Tartarus. That'll teach Princess Twilight how wrong she is about me!" And she gleefully rubbed her hooves together in delight.

Twilight glanced up from her work occasionally to keep an eye on her young charge. She smiled upon seeing how well behaved Cozy seemed to be. "Guess she's not as much trouble when she's got no place to go. But I can't keep her locked up and cooped up forever," She thought to herself. "There's got to be a way to get her to change and open up, especially about her parents."

At last, when the day's work was over, Twilight brought herself, Cozy Glow and all the foal supplies back to the castle. "Since you were a good girl today, you'll get a check mark on your chart," She cooed, floating it over to demonstrate. "Maybe if you behave well for a second day in a row, we can see about lowering it to five straight days of good behavior before we restore your potty privileges."

"Couldn't you just restore them now?" The padded pegasus pleaded. "I can't imagine it's fun changing my diapers, especially when you force me to use them all the time."

Twilight wasn't persuaded. "Sorry, Cozy. I can't reward you just for one day of good behavior, that's not how this works. I need to know that you can keep it up. And since I don't have something you obviously care about you're never going to be motivated to behave," Then she kissed the filly on the forehead. "Now go to sleep."

Pouting, the little pegasus reluctantly obeyed even as she shot Twilight a dirty look. "Does she really think her threats work on me?" She thought to herself. "She can keep me in diapers and spank me all she wants, my own mother couldn't get me to behave and neither can this poopy head of a princess!"

The next morning, Twilight woke up and tended to Cozy Glow as usual. Any hope she might have had about the filly's behavior improving was immediately dashed by how much of a fight Cozy put up as her diaper was changed. She squirmed and kicked about, striking Twilight in the face more than once. Small wonder Spike had ended up doing what he'd done the other day, not that Twilight condoned it.

Still, the change was eventually completed. But Twilight was exhausted, her mane and tail messy and out of shape. So after serving breakfast to her charge in the form of cut up pancakes, the young alicorn decided to step out for a little bit of "me time". "Thank goodness it's a weekend." She thought to herself, relieved at the fact that this meant Starlight would be on call to watch Cozy for a little while.

Twilight soon made her way over to Sugarcube Corner. If today was any indication she was going to need a lot of coffee to make it through.

Mrs. Cake soon came over with that motherly smile on her face. She always seemed to have this habit of trying to cheer up customers and Twilight was no exception. "Hello, Twilight. Forgive me for noticing but you seem a bit... well... frazzled."

"It's really that easy to tell, isn't it?" Twilight replied with something akin to a yawn. "Well, these past few days have been rather difficult. What with dealing with the aftermath of Cozy's attempted take over and everything. I'm actually surprised the rest of the students are taking it so well."

Mrs. Cake smiled. "I think that's a sign of how well you and your friends have taught them. Besides, time helps the shock of things to wear off, and no one's really seen her since."

Twilight then answered. "Yeah, but I've only got until the end of the month to fix her bad behavior or she's going to be sent to Tartarus. I don't want to give up on her, I really don't. But so far I haven't met with a whole lot of success."

The plump baker replied in a whisper. "I imagine it'd be quite difficult for any child in Cozy Glow's situation to suddenly start changing their behavior on a dime."

The young alicorn almost gasped and leaped into the air, but she didn't want to make a scene since the nature of Cozy Glow's punishment was supposed to be a secret. "You know?!" When Mrs. Cake nodded, Twilight demanded. "How?! Who told you?"

"Pinkie Pie," Mrs. Cake whispered back. "When she came back late from your castle the same night she was supposed to be foalsitting the twins, I had to ask her where she'd been," Then she added with a knowing wink. "It's alright, I 'Pinkie Promised' I wouldn't tell anypony else. Your secret's safe with me."

Twilight felt tempted to wipe the sweat from her brows (even though she hadn't actually sweated at all) but decided against it, still not wanting to draw unwanted attention.

The plump baker just continued to whisper. "You know, maybe what Cozy Glow needs the most is a role model or two. Someponies more on her level."

It didn't take a genius to figure out who Mrs. Cake had in mind for the job, and Twilight was understandably hesitant about it. "Are you sure that's a good idea? What will the twins think at seeing somepony older than them in a diaper?"

Mrs. Cake giggled while maintaining that whispered tone of voice. "They've seen stranger things from Pinkie Pie. And knowing them, they'll probably be delighted to have somepony they can be the 'big ponies' to," She then instructed. "You bring Cozy by a little later, okay? I might have some pointers on how to get Cozy to behave the way you want her to."

Thus it was arranged. Cozy was of course anything but happy with the prospect of "playing" with foals that she was supposed to be older and bigger than, but she had no real choice in the matter. "I am so glad I weaseled my way out of having to foalsit them in class once," She thought to herself as she recalled what few faint memories she had of the Cake Twins. "Those foals are even crazier than Professor Pinkie Pie! I'll bet she taught them how to drive me up a wall!"

Twilight brought Cozy over to Sugarcube Corner discreetly, making use of an enchantment on the stroller so that no passing by ponies would actually see the padded pegasus (they'd just see a random foal). "Now Cozy, I want you to be on your best behavior with Pound and Pumpkin Cake. Mrs. Cake was kind enough to invite us over, so don't make her regret her decision or else you know what will happen."

"Fine, I'll play with them for a while," Cozy frowned and stuck out her tongue as she was brought up to the nursery. "But they'd better not laugh or make fun of me for their sakes."

The twin toddlers were quite excited to see their new playmate, and once she was lowered into the playpen they waddled over to her. "Hi, I Pound Cake." The pegasus colt introduced himself.

"And I Pumpkin Cake." The unicorn filly introduced herself.

Cozy continued to frown as she swished her tail and plopped onto her padded rump. "You know my name, and I know your names."

Pound Cake smiled. "Ya Cozy Glow, the pony the big ponies treating like a foal. They say ya did something really naughty."

Pumpkin Cake added. "It must be really bad if grown ups want to treat you like you younger than us."

Cozy Glow only pouted and folded her hooves. "I hate those dumb grown-ups, especially Princess Twilight. She just had to do this to me even though she's not my mother!"

Pound just replied. "Wow, ya such a grumpy pants."

"Ya definitely acting like a big foal," Pumpkin pointed out. "Besides, Princess Twilight's nice. She play with us sometimes and she friends with our Auntie Pinkie Pie."

Pound added. "And she not the only princess we know. We also got to meet Flurry Heart, she a princess too," Though he frowned. "But she break our favorite toy the last time she play with us."

"But aside from that she nice." Pumpkin smiled.

The padded pegasus just protested. "Well I'm not Princess Twilight or that Flurry Heart you speak of. Just because I've been forced to be treated like a foal doesn't mean I have to enjoy it."

"Aw, come on, quit being such a poopy head," Pound waved a hoof at his new guest. "Ya lucky you get to be a foal again. There not many foals around here for us to play with."

Pumpkin then offered. "Why don't ya play with us? We've got lots of great toys. We could build the biggest block tower ever together!"

Cozy groaned in reluctance. "Fine, whatever," Under her breath she added. "You dumb babies."

About an hour or so ticked by in agonizing slowness for Cozy Glow, the crinkles of her diaper seemed to be amplified in her head as she uncomfortably wiggled about. The Cake Twins either intentionally ignored it to focus on their block tower, or somehow didn't hear the noise.

But the twins did delight in toppling over the block tower when it could go no higher, and were quite dismayed when Cozy didn't aid them in their duet of destruction. "Ya no fun at all. Even Flurry Heart play with us." Pound pointed to Cozy with narrowed eyes.

Pumpkin added. "We older than you now, you gotta do what we tell you to do. So when we tell ya to play with us, you play with us."

"I helped you build your block tower, isn't that good enough?" Cozy frowned.

"Ya gotta do more!" Pumpkin pointed out! "Ya a foal, so start behaving like one!"

Pound then declared. "At least start bouncing on ya diaper, we used to love doing that when we wore diapers!" With a smile he boasted. "But now we in potty training and it's the best!"

Pumpkin nodded in agreement. "Yeah, we get to be big ponies! Mommy, Daddy and Auntie Pinkie Pie say so. You still wear diapers though, so ya not a big pony at all." And then she and her brother giggled.

At that something inside of the padded pegasus pony snapped! "You think I'm not a big pony?! I'll show you how much of a big pony I really am!" She prepared to lunge at the twins in the hopes of teaching them a lesson (probably by forcing them back down to her level).

However, Twilight moved to intervene before Cozy could do anything. Picking the filly up with her magic she scolded. "Cozy Glow, that's not very nice! Just because the twins teased you doesn't mean you have to attack them."

Mrs. Cake, meanwhile, scolded both her children. "Pound Cake, Pumpkin Cake, you know better than to make fun of others because of what they wear. Big ponies don't brag about their big pony privileges. Apologize to Cozy Glow this instant!" And she shot them a very stern glare that silenced any will the twins might have had to disobey.

Whimpering ever so slightly, Pound and Pumpkin both said at the same time. "We sorry, Cozy."

Mrs. Cake was satisfied with the answer. "That's better," Then she decided. "I think now might be a good time for a snack."

"Yay, snack time!" The twin toddlers cheered while Cozy remained silent, watching them be picked up and taken out of the nursery.

Cozy expected to be brought downstairs to join the twins, but to her surprise she was brought closer to Twilight while the two remained in the nursery. "What, now I don't even get to have snack time?" She rolled her eyes. "So now you're gonna starve me into submission? Or maybe you just wanna give me some more spankings."

Twilight shook her head. "I'm not going to spank you, and I'm not gonna let you starve. You'll get your snack. I have something in mind," Her tone of voice indicated that she was rather hesitant to do what she was about to do. "I hope that by doing this we can draw closer together, like when a mother does this with her own foal."

The padded pegasus blinked before realization slowly set in and her eyes widened! "You wouldn't!"

The young alicorn just replied by pulling out some tablets that left little doubt as to what they were for. She hesitated for a couple of moments, before popping the tablets into her mouth and swallowing hard. Within minutes her teats began to grow heavy and full. "Come on, Cozy!" She instructed, groaning under the increased weight.

Try as she might, Cozy was unable to keep herself from being pulled close to the princess' teats, until finally her mouth was firmly wrapped around a nipple.

"Please let me nurse you," Twilight pleaded when Cozy didn't budge. "This is so uncomfortable!"

Cozy opened her mouth to protest, a mistake that cost her dearly as warm and creamy milk suddenly poured down her tongue. Try as she might she couldn't bring herself to stop once she had gotten that first taste, it brought back memories of a more blissful time. A time when it didn't matter what her grades were like or how she appeared. A time when the only expectation she faced was simply being a happy foal who got along with other foals.

Twilight, for her part, seemed to settle into a sort of blissful state of her own as the nursing continued uninterrupted. "Is this what my mom felt like when she nursed Shining Armor and I when we were foals?" She thought to herself. "She says she actually only stopped breastfeeding Shining because he told her to."

Suddenly, however, a surprised Mrs. Cake came into the nursery and happened to gasp upon seeing the sight before her very eyes! That brought the blissful scene to an end alright!

Cozy ceased her suckling and began to spit and gag! "I can't believe I actually had to drink that!" She protested.

And as for Twilight, all she could do was blush! "I... I'm so sorry, Mrs. Cake! I should've at least locked the door or something! Oh, what I was thinking breastfeeding Cozy Glow? She's gonna hate me even more now because of this!"

However, the plump baker put a hoof around the princess and reassured her. "It's alright, Twilight. I was just... startled," She then blushed. "I'm embarrassed to admit it, but I still occasionally store my breast milk in bottles just in case. I haven't nursed in public or private in a long time though."

"That's different, you have actual children who needed that breast milk. Cozy most certainly didn't," Twilight protested. "I could've made her sick or something."

As if to confirm the point, Cozy began to double over as she put a hoof to her stomach. "Oh no! Not again! I've been trying so hard not to do this!" She lamented aloud, before her tail hiked up and her face turned red. She was relieved it was over so quickly, even as a familiar stench filled the air.

"Oh, this is all my fault! I should've tossed those lactating pits away the moment I laid eyes on them!" Twilight mentally kicked herself as she prepared to change Cozy's diaper.

Mrs. Cake thought otherwise. "You were doing what you thought was best for Cozy Glow. Perhaps a bit of dependence would do her good, because from what I've seen she's trying very hard to be independent and not necessarily because she wants to."

The padded pegasus growled despite her messy diaper. "How would you know that? You don't know me!"

"I am a mother, and that means I see things that other ponies don't necessarily see. Mothers have unique perspectives on some things," Mrs. Cake commented to Cozy. "Mind you, I could be wrong. But it seems to me that you're not just trying to be a filly but in fact a full grown mare in a filly's body even though you're just a school aged foal."

"I wonder if that's the case," Twilight mentally pondered to herself as she went about changing Cozy into a fresh diaper. "Is that why she came to my school instead of the schoolhouse?"