Sierra couldn't help feeling a little awkward as she sat in the cafe, waiting to meet the girl from online. She knew there was probably no need to be nervous, but there wasn't much she could do about that. And, unless she wanted to move back in with her family, there wasn't much she could do about needing to make this meeting go well, either.

"Sierra?" Sierra turned, blushing slightly when she saw the girl, looking just like her pictures. She was so pretty, and so tall, that Sierra had to forcibly remind herself that she was the older one here, the more mature one.

"Mckenna?" she put on a brave smile, getting down off of her chair, only to have the girl grab her into a hug. "I hope so," she joked.

"I am so glad you showed up!" Mckenna told her, letting go and sitting down in the other chair at the table, letting Sierra sit back down in hers, very glad that she had decided not to play it safe and wear Goodnites here, just in case, after that tight squeeze. Maybe Mckenna wouldn't have noticed, but it was nice not to have to worry about it.

"Of course," Sierra said, sounding a little confused. "Why wouldn't I?"

"You wouldn't believe how difficult this has been," Mckenna sighed.

"Really?" Sierra frowned, starting to wonder if maybe this wasn't such a good idea after all. From what Mckenna had told her online, she was a rich heiress with a nice, big house that she'd decided she wanted a roommate in, that she'd let stay there free of charge. Considering the trouble Sierra had been having finding a good job, it was exactly what she needed.

Mckenna fidgeted in her chair, blushing. "Well, yeah," she admitted. "I probably should have told you all this earlier, but you seemed so cool, and so mature, and I thought you'd be a perfect fit, so I didn't want to scare you off. I really should have been honest with you, though, huh?"

Sierra sat a bit straight, trying not to let the words go to her head. Had anybody ever called her 'mature' before? If they had, it had been quite a while. Usually, nowadays, it had an im- in front of it. And 'cool' wasn't particularly common, either. She wanted to gush out a, "Really?" and listen to the girl compliment her more, but that didn't feel particularly cool or mature, so, instead, she nodded silently.

"Yeah," Mckenna looked down at the table, and the glass of soda sitting in front of Sierra. "I guess I was embarrassed. You see, I'm a little bit of a wild child, you could say. I go out and I party all the time, and I get way too drunk, and... Well, that's part of why I wanted someone to live with me, to help me stop doing all that. Or at least tone it down to a more acceptable level, you know?"

That was, in fact, something Sierra knew next to nothing about, although that didn't stop her from giving another quiet nod, then taking a sip of her drink, the bubbles mixing with the butterflies forming in her tummy. It was really happening! Mckenna must really look up to her, to think that she was the right person for this job! "I can't make any promises," she hedged her bets, "but I'll do what I can. I mean, I will, if you decide to let me move in, I don't want to make any assumptions."

"Oh, just having someone else in the house will help so much," Mckenna assured her. "I think that's a lot of the problem! There's nobody else to hang out with, or to do anything else with, so I just fall back into my old, bad habits."

"So, you just want to spend time together?" Sierra could hardly believe someone as pretty as this, who seemed so popular and cool, would want to do that with her, of all people. "I-I can do that!"

"That is part of it," Mckenna said. "I'm afraid I might need more than that, though. That's why I wanted someone older, and wiser. I really need someone who can put me in my place if I get out of line."

"I have a lot of babysitting experience!" Sierra exclaimed, strategically not mentioning how so many of those babysitting jobs had ended for her. "N-Not that you're a baby, of course, but I know about discipline, and..."

Mckenna beamed. "That's perfect! You can feel free to think of me as one of your charges, if that would help! Really, I know that you're older, and you know better, so even if the difference is only a couple years, I want you to exercise that authority and help show me how to be a responsible adult!"

Those last two words were another phrase Sierra didn't think had ever been used to describe her, though that just made her want to do this all the more. Maybe her problem was that she spent too much time around people who didn't believe in her like this, and if she was with Mckenna, who did see her this way, she'd start to behave like that naturally.

"If you want," Mckenna blushed again, "you can think of yourself more like a big sister. I mean, a babysitter is good, but as a big sister, you have even more authority, and I think that's what I need, you know?"

"O-Okay!" Sierra giggled eagerly. "I've always wanted to be a big sister!"

"Perfect," Mckenna smiled. "So, as a big sister, do you think you can help me come up with some house rules? That's really what I need, some rules, and they don't feel the same if I'm the one that comes up with them."

"Sure," Sierra agreed, the two of them chatting over some fries, setting up how they would divide up the chores, giving Mckenna a curfew, anything else that Sierra could think of to show that she knew what she was talking about.

"There is one other thing," Mckenna said as they finished up, looking around the cafe nervously. "I, uh... I have a bad habit of drinking too much, and then wetting myself."

Sierra felt her face heating up, thinking of all the times that she'd had accidents herself, and far worse ones than that. "W-Well," she swallowed, trying to pretend the subject wasn't making her self-conscious, "if you stick to your curfew, then that shouldn't happen that often, should it?"

"You never know," Mckenna shrugged. "I just think it would be better if there were consequences for that. That would help encourage me not to do it. But what do you think? What should I have to do if it happens again?"

Sierra squirmed in her chair. "W-Well, you do have a point," she said. "I-It is best to have consequences." She thought to all the punishments she'd been subjected to, most of them sounding too childish to work on someone like Mckenna, or for her to suggest. Then again, there was on that really made sense, and, as she watched Mckenna start to frown as Sierra struggled to come up with a solution, perhaps second guessing how suitable she was for this, Sierra blurted it out. "What about diapers?"

Sierra blushed. It was her turn for her eyes to frantically dart around the nearby tables to see if anyone had overheard that. Mckenna, however, didn't seem too bothered by it. "Diapers, huh?" she mused. "I gotta say, I wouldn't have thought of it myself, but that would definitely be a deterrent. How about wet panties mean a full day in diapers?"

"Sure," Sierra nodded, eager to get off of this train of conversation. "Sounds good!"

"On the other hand," Mckenna paused, "Is one day really enough? If I drink enough for that to happen, I'll probably be spending most of the next day in bed anyway."

"I-I think so," Sierra said.

Mckenna furrowed her brow. "I don't know," she shook her head.

"How about this, then?" Sierra didn't want to lose the girl's respect, as it felt like she was on the verge of doing by being too soft. "If it happens three times in a month, you have to throw away all your panties, and from then on, you have to wear diapers until you can prove you're ready to go buy more big girl underwear?"

"Oh, wow!" Mckenna chuckled. "That's harsh!" Before Sierra could apologize and walk it back, she continued, tapping away on her phone, adding it to the list of rules. "It's perfect! Three strikes. That's more than fair."

Sierra smiled in relief, both that this seemed to be going well, and that they appeared to be done with this topic. "I thought so," she fibbed, as if she'd planned it all along.

"These look like good rules," Mckenna scrolled through the list on her phone. "What are we going to do if they get broken, though? There needs to be consequences for that, too."

She'd just had punishments on the brain, and she'd already ruled most of them out. The one that popped into Sierra's mind, however, was, "Spanking?"

"How old school!" Mckenna giggled. She was enough bigger than Sierra that Sierra wasn't sure how effectively she'd be able to spank her, so it seemed silly now that she'd said it, but that didn't bother Mckenna. "I think that's good. Only immature little brats would break these rules anyway, so that's what they'd deserve. What kind of spanking, though? No offense, but your hands aren't exactly... intimidating."

Sierra wasn't offended, since she'd been thinking the same thing. "A hairbrush?" she shivered, recalling all the times she'd been on the other end of that. "I-It has to be a real spanking, or what's the point?"

"That's going to keep me in line!" Mckenna squealed. "I love this! So strict, but that's exactly what I need."

"Is that it?" Sierra asked. "A-Am I in?"

"Of course, big sis!" Mckenna beamed. "We are gonna have so much fun together!"

~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~

Mckenna printed up the rules and stuck them to the fridge. Sierra was surprised at just how well that seemed to work, with Mckenna dutifully doing everything they'd agreed to, with no signs at all of her 'wild child' nature. Or maybe, she thought, that was just her influence. Maybe she was so good of a big sister that her mere presence was enough to dissuade her from misbehaving.

She did her best to live up to her role, giving advice, and the occasional arch, "Are you sure that's a good idea?" when Mckenna would say she was thinking about heading to a party at one of her friends' places.

She must be doing a good job, because Mckenna would always pause, and pout, and admit, "Maybe you're right," before settling for snuggling together on the couch to watch a movie instead. And Mckenna never tried to dodge her chores, either.

Sierra, on the other hand, was not so good. She started out that way, wanting to set a good example, but she'd never been a big fan of doing the dishes, and, one day, when there weren't that many after supper, it didn't seem like a big deal to leave them until the next morning, rather than dealing with them after a nice, yummy supper.

At least, it didn't until Mckenna knocked on her bedroom door when she was about to start getting ready for bed. "Yeah?" Sierra called. "Come on in."

She turned, and saw the younger girl standing there, hairbrush in hand. Automatically, from all her years of experience, she felt herself start to panic, a spurt of pee dribbling out into her panties before she could remind herself that she was the big sister here. She was the one in charge.

"Mckenna," she shook her head. "What did you do?" It was late enough that she couldn't say she really wanted to do this right now, but, as the big sister, she had to be ready to keep the other girl in line whenever it was necessary. She wasn't exactly pleased about doing it in soggy panties herself, but a quick glance in the mirror proved that the accident wasn't bad enough to show through her shorts, so Mckenna would never know.

"I didn't do anything," Mckenna told her.

"Really?" Sierra wiggled her bottom, her wet panties feeling even more pointless now. "Then what are you doing with...?"

"Well," Mckenna stepped into the room, "I couldn't help noticing that you didn't do the dishes. It's your day, isn't it?"

Sierra squirmed. "Y-Yeah, but I was going to get them in the morning."

"Sierra," Mckenna sighed. "We made those rules for a reason, didn't we?"

"W-Well, yeah," Sierra admitted.

"And the rules say that we have to finish our chores before going to bed, unless we have a good reason, don't they?"

Sierra's stomach churned, seeing right where this was going. "Th-They say you do!" she whined.

"They're house rules, Sierra," Mckenna reminded her. "They're for everyone in the house. And we have to stick to them, or they don't mean anything, do they? I'm sorry, but this is only fair."

She sat down on the edge of Sierra's bed, patting her lap, heavy, wooden hairbrush clasped in her other hand. Sierra could feel tears welling up in her eyes already, quickly trying to wipe them away, knowing that, as the big sister, she shouldn't be crying even before a single spank had landed. "I-I'm sorry," she sniffed. "I-I can go do them now, or..."

"Sierra, you know better," Mckenna scolded, patting her lap again. "Rules are rules."

Before she could stop herself, Sierra stomped her foot in frustration, which didn't make her feel any better. If anything, it forced her to trudge over to her bed, wanting to set a good example. She gulped as Mckenna bent down, reaching for the waistband of Sierra's shorts. "Y-You don't have to do that," she stared up at her with big eyes.

"Yes, I do," Mckenna shook her head. "It has to be a real spanking, doesn't it? Or what's the point?"

Sierra swallowed, hearing her own words parroted back at her, desperately trying to think of a way out of this, as Mckenna unbuttoned her shorts and slid them down, exposing the damp panties underneath.

"Sierra!" Mckenna gasped.

"I-It's not what it looks like," Sierra lied, squirming in place. She squealed as Mckenna scooped her up, dragging her over her lap, hairbrush crashing down hard on the seat of her wet panties. "Oww!" she howled, kicking her legs, her shorts tumbling off, onto the floor below.

"I can't believe you, Sierra!" Mckenna smacked her wiggling backside again, Sierra already feeling the warmth, and the glow that was sure to come with it, growing there. "It was your rule! You know what happens if somebody wets their undies in this house, and you were trying to hide it?!"

"N-No!" Sierra shook her head. "Th-That's not it at... Ouch!" She was interrupted with another pair of spanks, one after another. She writhed and whimpered, but there was no escaping Mckenna's grip. "N-No!" she squeaked as she felt the girl's hand hook under the waistband of her panties.

"Yes," Mckenna countered, sliding the underwear down. "I think you've more than earned a bare-bottom spanking."

And that was exactly what Mckenna gave her, taking no mercy on the quickly bawling Sierra, not stopping until her backside was red, and throbbing, and standing in the corner. Sierra sniffed, feeling sorry for herself, her panties still around her knees as she gingerly rubbed her rear.

She'd almost forgotten about the next part of the punishment until Mckenna returned, diaper in hand. "Mckenna, no," she wailed. "I-I don't wanna wear diapers!"

Mckenna sighed, shaking her head. She grabbed Sierra by the wrist, yanking her back over to her bed. "No, please!" Sierra yelped, not sure she could take any more as she was draped over Mckenna's legs once more.

"Well, you have a choice," Mckenna told her sternly, holding up the hairbrush and the diaper, one in each hand. "You can let me put you in your diaper now, or I can do it after I spank you some more for trying to break the rules. Which is it going to be?"

Sierra wanted, badly, for there to be a third option, for her to be able to convince Mckenna that she'd never meant for the rules to apply to her as well. After what she'd just been through, however, she didn't have the guts to try anything that might end with another session with the hairbrush, and, like it or not, she knew that meant there was only one answer she could give.

"The d-diaper?" she stared up at Mckenna, feeling another tear roll down her cheek. Maybe that would be enough for Mckenna, to see that she was willing to subject herself to that, to set an example for her. She wouldn't really go through with it, would she? Sierra was her big sis!

"Good pick," Mckenna patted her on the head, helping her off her lap, letting her stand beside the bed, watching, as she opened up the diaper, spreading it out, showing no signs of stopping. "Come on," she patted the diaper, Sierra cringing at the all too familiar sound of crinkling. "Up you go! Let's get you all diapered up so you can go to bed and think about what you did!"