Matti did her best to suppress a whimper as she sat at the table again after slinking back to the dining room, reluctantly accepting that there was nothing she could do to get out of this. She shifted in place, the warm padding squishing beneath her as a humiliating reminder of what she'd done, and how she was going to be spending the rest of her tutoring session.

"Someone's wet," Kiara commented wryly from the other end of the table.

Matti gasped, heart pounding. How did she know?! "Wh-What?!" she squealed, head spinning in utter mortification at the idea that this girl, younger and smaller than her, the daughter of a professor whose good side she really needed to stay on, was aware that she was not only padded, but had used that padding. "I-I don't know...!"

Kiara rolled her eyes. "The doll," she said. "Who else would I be talking about? Do you not hear it crying?"

In her panic, Matti genuinely hadn't. It probably didn't help that she was so used to the sound now that it hadn't broken through her daze. "O-Oh, right," she made herself chuckle. "O-Of course..."

Kiara tilted her head slightly, then shrugged. "There should be some spare diapers there. And a little thing of powder. Make sure you use that, or I get docked points."

Matti spotted the supplies, blushing as she picked them up, setting them down in front of her. "I-I don't really know how to do this," she admitted, feeling a bit overwhelmed.

"Let me guess," Kiara sighed. "You didn't play with dolls, and you never babysat, either."

"Nope," Matti shook her head. And, while she did have to wear diapers on a regular basis, it was usually Valerie who put them on her. And it was different doing it to someone else, anyway, rather than to herself.

"You're in college," Kiara reminded her. "I'm sure you're clever enough to figure it out. Or I can interrupt my homework to come help you."

It was the girl's assignment, so she should be doing it, or at least assisting, but Matti still felt embarrassed at the idea of not being able to do this one, simple thing by herself. "I-I'll try," she said uncertainly, sliding the doll closer to herself, unsnapping its onesie. "L-Look at that," she commented. "The diaper even turns yellow."

"It certainly does," Kiara replied condescendingly. "Good job knowing your colors!"

Matti squirmed in her seat. "Well, I didn't know!" she pouted, not in the mood to be teased. "I told you, I didn't do this in school!"

"Well, now you are," Kiara said. "Could you get to it? I'll lose points if I make her wait too long, too."

It was so important that this toy get a dry diaper, meanwhile, Matti was the one who definitely needed it, or she might end up with a rash. It wasn't like Valerie had sent her off with a spare, though, unfortunately. So the doll was the only one who actually got a change. She bent over the table, ripping open the velcro sides of the diaper, skin crawling at how similar it sounded to the tapes of her own overnight diapers being undone. Or maybe that was her imagination getting the better of her.

She slid the clean diaper under the doll's bottom, starting to pull it up between the legs when she heard Kiara clear her throat. "Baby powder," she called.

"Right!" Matti grabbed the tiny, plastic bottle, blushing. Kiara had told her about that, and she'd put it with the diaper, she was just so flustered by all this that she'd wanted to get it over with as soon as possible. Just like with the bottle, and the toys, this felt too much like playing with dolls, like a little girl small enough to still genuinely belong in these Pull-Ups might, and not like what she'd ever imagined tutoring would be. Kiara was supposed to look up to her, to be impressed to have a real, live college student in her house, helping her out. Instead, the girl had her changing a doll's diaper while she sat there in her drenched training panties.

The bottle was hollow, of course, and empty. There wasn't even an opening in the top. "What am I supposed to do with it?" she frowned.

"Seriously?!" Kiara hopped down from her chair, storming over, curling her hand around Matti's, as much as she could when her own hand wasn't as big as her tutor's, and the baby powder inside it. Matti meekly let the girl guide her hand over the doll, turning the bottle over, tapping it against the doll's crotch. "There!" she declared. "The sensors just need to pick up that you used it."

Matti knew she shouldn't care, that it was probably more mentor-like to have Kiara do part of it herself anyway, but she still felt bad that she'd failed to do this one, simple thing on her own. "S-Sorry," she shifted in her seat, the squish of her Pull-Ups making it hard to recall that she was the older one here, despite the difference in their size.

"Since I'm here, I guess I might as well help you with the rest, too," Kiara sighed. "Just pull that front part up. Hold on, it isn't on there straight." Kiara adjusted the doll on the diaper. "There we go! Pull it up and over her tummy. Good! Now, hold that there." She pulled one of Matti's hands to the front of the diaper, pushing it down against it before moving on to Matti's other hand, moving it down to grab one of the diaper's sides, helping her pull it up snug and attach it before switching the hands out, using one to keep the diaper, and doll, in place while the other fastened the second side.

"There!" Kiara exclaimed. "You did it! What a clever girl!" She patted Matti on the head, the tomboy not feeling like she deserved that praise at all. All she'd done was put a diaper onto a doll, and she hadn't even done all of it by herself. That wasn't something that needed to be celebrated at all, not for someone her age. "Now, can you go take that old diaper and rinse it out in the sink and put it on the towel rack to dry? That will get rid of the yellow so it can be used again."

"O-Okay," Matti nodded.

"Are you sure you can do that all by yourself?" Kiara teased. "Or do I need to come along and show you how to do that, too?"

Before Matti could think, she felt herself going with her natural instinct, which was to stick her tongue out at the girl. Only once she'd done it did it occur to her how ridiculous it must look, coming from a supposed authority figure. "Y-Yeah, I can," she replied bashfully, pretending that was all she had done, picking up the 'used' diaper and scurrying back to the bathroom she'd come so close to getting to use a few minutes before. She had gone in afterwards and flushed, to make it seem like she'd made it to the toilet, but the swollen, soggy bulk between her legs reminded her constantly that she hadn't.

She ran the diaper under the faucet, wistfully watching the yellow vanish from the diaper. If only it was that simple to get rid of her own accident, she thought, ringing the tiny bit of fabric out and hanging it next to the hand towels. Theoretically, it kind of was, if she was being honest, since all she really had to do was take the Pull-Up off and throw it away. But her skirt was so short, she wasn't going to run around without anything underneath it, certainly not around her professor's child! And she didn't want Kiara to find it in the garbage can, either. Not to mention how Valerie would respond if she came home without her trainers. The Pull-Ups could, technically, go away as quickly and easily as cleaning up the doll's diaper, and yet she was still somehow trapped in them, helpless to do anything about it.

When she returned to the dining room once more, Kiara was back in her seat, and the doll was lying in front of Matti's, naked except for its diaper. Matti blushed, feeling a weird kinship with the toy after their shared soggy experience that made her embarrassed for it.

"Why did you...?" she started to ask, knowing she hadn't taken the doll's onesie off herself.

"It was getting warm," Kiara told her.

"So it just has to sit there like this?" Matti fidgeted. Babies weren't exactly known for their modesty, obviously, but it still felt wrong somehow.

"No," Kiara replied. "I have a shirt there for it." She nodded, and Matti saw a little pink top.

"Well, why didn't you put it on her?" Matti glowered. If Kiara had taken the time to undress the doll and put the new shirt for it there, why hadn't she done that, too? Why was she making Matti do it? It would have only taken an extra couple seconds, surely, and there was no way her homework was so urgent she couldn't spare that!

"Because I like your shirt so much, I thought it would be cute if she had one just like it," Kiara told her, her tone making it difficult for Matti to judge if the girl was mocking her or not. "I couldn't remember exactly what it looked like, though, so I couldn't make it myself. Plus, it's your shirt anyway, so, you do it."

"It isn't my shirt!" Matti whined. "I told you, I borrowed it!"

"Whatever," Kiara said. "It's on your body, so you can just look down and see what it is, and copy it for the doll. There are some fabric markers there, so get to it."

"I don't see how this is going to help your grade," Matti huffed. "And don't these clothes belong to the school, too? Are you allowed to draw on them?"

Kiara looked surprised for a moment, her mouth opening for a split second and nothing coming out. Immediately after, however, she smiled and shook her head. "That shirt is from one of my old dolls," she replied, "so I can do whatever I want with it. And I want a copy of your shirt."

That still didn't answer how this had anything to do with her assignment, or why Matti, as her tutor, should have to do it. There was also no real reason why she shouldn't, however, and it might be less embarrassing to occupy herself with that rather than to attempt to understand that textbook again.

"I'm not really an artist," Matti warned her, glancing down at her chest and flicking through the markers to find one the right color.

"Don't worry," Kiara assured her. "I'm sure the doll won't mind if it isn't perfect. Speaking of, we can't just keep calling it 'the doll.' What do you think we should name it?"

Matti wrinkled her nose. "Why are you asking me?"

"Right, right," Kiara nodded. "You didn't play with dolls, of course. You didn't name your other toys?"

"Not really," Matti shrugged. "Nothing interesting, anyway. I had a toy train I called Choo-Choo, and stuff like that."

"Aww," Kiara giggled. "How cute!"

Matti blushed. "B-But it's your doll anyway! It's for your class! You should be the one naming it!"

"But you're doing such a good job of taking care of her today!" Kiara cooed. "This is your reward! Now, come on, Mathilda, I'm sure you can do it! When was the last time you named something?"

Matti suddenly became very invested in her task, staring intently at the Barbie logo she was drawing. "W-Well, I guess it was for my D&D game," she admitted.

"Of course you play D&D," Kiara snickered. "And what did you call your character?"

Matti's cheeks warmed even more. "M-Mattix."

"Of course you named it after yourself." Kiara said. "Well, I suppose that's as good a name as any."

"What?!" Matti squeaked. "No! Mattix is a barbarian! She's big, and tough, and..!" She'd always envisioned her character as a cool, fantasy version of herself. Hearing it attached to this little baby doll, lying there in only a diaper, was almost worse than the toy having her own name instead!

"And she is going to love that new shirt!" Kiara exclaimed. "You did such a good job! Go on, put it on little Mattix!"

"That's not her name," Matti sulked, but now that the idea had been planted, she couldn't help thinking of her character as she looked down at the doll in its diaper, reluctantly pulling the shirt over its head. She couldn't imagine how the strong warrior could ever possibly end up that way, but the thought of it did push her buttons a bit, making her squirm in her slowly cooling Pull-Up with a blush.

Mattix almost immediately started to cry, just like any barbarian who had been reduced to a helpless baby doll might. "S-See?" Matti stammered. "She doesn't like it!"

"Don't be silly," Kiara told her. "She's just bored. I bet she wants to watch something."

"No, she doesn't," Matti rolled her eyes. "There's no way the doll can...!"

"Come on!" Kiara beckoned, getting out of her chair once more, walking towards the living room. "Let's see, now. What's your favorite Disney princess?"

Matti wrinkled her nose. "I don't know!"

"How do you not know?" Kiara shook her head. "Don't tell me, you didn't watch those, either?"

"They were around," Matti shrugged. "My sister liked them, but I always thought they were boring, so I didn't really pay attention."

"Well, there's your problem," Kiara said. "Mattix loves all of them, so you're just going to have to get used to them."

"The doll doesn't care..!" Matti shook her head.

"Her name is Mattix," Kiara reminded her, driving it in further how she'd co-opted the name of Matti's character. "Don't be rude." She grabbed the remote, clicking around to pull up Disney Plus and going straight to the Princess collection.

"Kiara!" Matti stomped her foot, forgetting again that she was supposed to be the adult here, the one in charge. "You can't make me watch that!"

"I'm not making you do anything," Kiara sighed. "You're doing it for Mattix. Let's see, I think Beauty and the Beast is a good place to start."

She turned it on, stepping back behind the couch where Matti reluctantly sat, dropping the doll onto the cushion beside her. A moment later, the doll stopped crying, as if, somehow, it really did know what they were watching, and was happy about it. Matti, on the other hand, was not, and, after a few moments, she leaned forward, snatching the remote off the coffee table, and switched it off, ready to look for something else.

A second later, Mattix began to cry again. "What?!" Matti looked at the doll in disbelief, and, upon turning her head, saw that Kiara was still lurking behind her, phone in hand. "Did you do that?" she narrowed her eyes.

"Don't be silly," Kiara smiled. "If I could control what Mattix did, that wouldn't be much of an assignment, would it?"

"W-Well, no," Matti admitted. "But..."

"She just really likes Belle! I'm sure you will, too, if you give it a chance. Go on, put it back on." Matti resumed the movie, and the doll quieted down.

"I can see you!" Matti glared. "You're doing something over there!"

"I'm texting," Kiara sniffed.

Matti wasn't convinced, but, at the same time, she knew that Kiara had a point. If the teachers let the students dictate what their dolls did, that wasn't really simulating the parenting experience. And that was the point of this kind of assignment, wasn't it? Maybe Kiara was telling the truth, and it was just a coincidence. Or maybe the doll was advanced enough to know what was being played for it after all. That seemed kind of advanced for something that the school just let students take home with them, but, judging by her uniform, Kiara went to a private school, so maybe that was par for the course there.

Either way, whether it was the doll or Kiara, it appeared she wasn't going to be able to get away with not watching the movie. She didn't even have her phone with her, since her outfit had no pockets, so it was in her bag, which she'd left in the dining room. She sighed, settling in, scowling down at the doll sitting beside her in its matching shirt, its big, fluffy diaper almost seeming to mock her, reminding her of her own padding, and how squishy and soggy it was.

She squirmed, blushing as she caught her hand creeping towards the hem of her tiny skirt, and, more importantly, what was underneath, peeking behind herself to make sure Kiara wasn't watching. This really was not the right time, and she knew it was very inappropriate to be doing in her professor's house, with her daughter only a couple rooms away, but this whole situation was so humiliating, in a way that she found so hot, which was embarrassing in its own right. And her Pull-Up was already wet, so what would it hurt if she had a little fun?

Before she could get too far, however, she heard a door open. She froze, hand leaping away from her trainers instantly, as if they had just caught on fire, adjusting her skirt frantically. Was Dr. Osswald home?! What was she going to think if she came in here and found the tutor she'd hired sitting on the couch, watching a Disney movie, with a baby doll next to her?!

Should she get up? Turn off the TV? Scurry to the dining room to pretend she was helping? She could hear footsteps approaching, and knew she was running out of time, her heart pounding as she saw a figure step into the doorway.

It wasn't Dr. Osswald. In a way, it might have been even worse than that. It was a girl, probably Kiara's age, though, unlike Kiara, she actually looked like an eighteen year old in more than just her figure. Where Kiara was adorable and petite, this girl was beautiful, and quite tall, certainly in comparison to Kiara, or even Matti. Matti assumed they went to school together, but she was wearing shorts and a tank top, instead of the uniform Kiara was still in.

The girl stopped when she saw Matti, smiling down at her as the college girl fidgeted bashfully on the sofa, knowing exactly how she must look to an outside observer at the moment, how childish and immature it was, even with her hands firmly pulling her skirt down to hide her wet Pull-Ups.

"Hello!" the girl waved. "Aren't you a little cutie?" Matti froze, blushing bright red at having a younger girl describe her that way, and at the tone she was using, the same one Matti always heard other girls her age use when they were talking to little kids. "Sorry if I scared you! I come over all the time, so I didn't think to knock. Your babysitter asked me to bring over a couple things for you!"

She held up a plastic bag Matti hadn't noticed her holding, though Matti didn't even think to try to see what was inside, what Kiara could possibly have asked for. She was far too busy cringing, her whole body burning with humiliation at what she'd heard right before that, so awful that she'd barely heard the rest of the sentence. "My b-babysitter?!"

"Sorry," Kiara sauntered in, putting her hands lightly over Matti's ears, as if she didn't want her to hear what she was going to say next. "We're calling it 'tutoring,'" she told her friend with a wink. "And little Mathilda here is learning a whole lot, aren't you, sweetie? Just not how to keep her pants dry."

Matti's heart stopped for a moment, then started back up, pounding louder and louder in her chest as she gulped, trying to convince herself she'd misheard.

"Aww, don't be embarrassed!" Kiara's friend said. "Everyone learns at their own pace! My baby sister was four and a half before she was potty trained!"

Matti groaned, the words only making her feel worse, being compared to a literal toddler.

"It's a good thing, too, or her old diapers probably wouldn't fit Mathilda," Kiara smiled. "Come on, sweetie, why don't you give Skylar a curtsy to say thank you?"

"D-Di..." Matti's head swam as she heard that word, looking back at the bag Skylar was holding. This couldn't be happening!

"Do you not know how to do that, either?" Kiara shook her head, though she sounded a bit less mean about Matti's ignorance now, perhaps because her friend was there, listening. "You just lift your skirt up a bit like this, and bend your legs like this... Come on, get off the couch, silly! Mattix will be fine there on her own for a minute!"

Matti, of course, made no move to copy what Kiara was showing her, too stunned, and too aware of how tiny her skirt was, and how much her Pull-Ups were sagging underneath. There was no way she could curtsy without showing them off, without letting these two girls see the faded design on them that would confirm that she did, indeed, belong in the diapers waiting in that bag for her.

"Do you need help?" Kiara reached for Matti's skirt eagerly, ready to take over like she had with Mattix's diaper change.

"No!" Matti shook her head, pushing the girl's hands away. There weren't that many people she was bigger, or stronger, than, but Kiara was one of them, and she wasn't about to let this little girl push her around like this! She was putting her foot down, right here and right now!

"Mathilda," Kiara crossed her arms. "Do I need to tell my Mommy about this? Because she'll tell your Mommy, and I bet she wouldn't be happy to hear you were misbehaving, would she?"

Matti swallowed. The real threat, of course, was the first part, the idea of Dr. Osswald finding out about this. And, despite her resolve to not let herself be manipulated by the girl, it was enough of a threat that Matti knew she couldn't run the risk of letting it happen, no matter what.

Hands shaking, she grabbed the sides of her skirt, pulling them out as little as she thought she could get away with. "L-Like this?" She honestly wasn't sure. She'd seen it done, mostly in movies, but had never paid that much attention, and she'd been too consumed with embarrassment to watch too closely to Kiara's example.

She should have known better than to say anything, however, as Kiara leapt at the chance, stepping forward with a grin, pushing Matti's hands further apart, letting her skirt raise, showing off more and more of her soaked Pull-Up, guaranteeing that, even before she bent her legs, flashing most of the rest of her trainers to the two younger girls, all of them knew exactly who the baby of the group was, and who belonged in that diaper waiting in Skylar's bag.