Bonnie bit her lip as the final bell rang for the day, and unfortunately she had been unable to get herself into any form of punishment that warranted after school detention. Instead all she had was extra math and English homework that would be harder to finish up then her normal homework because she had a after date with bottle, bibs and full diapers. And before dear reader you assume it was going to be her own butt going back in Huggies, no. It was only Kimberly Anne Possible who everyone at school knew wore diapers 24/7 but only her family and friends and her poor babysitter (AKA Bonnie) knew that she went full on big baby once she was out of the public eye.And worse? the big dumb baby had the biggest crush on Bonnie who's barn doors did NOT swing that way. And any attempt to explain that to Kim just made the stupid big baby smirk and go:
"Not yet."
 
'Maybe I can get in a accident on the way, and just bow out that way..' Bonnie thought as she trudged her way to her locker. 
The kicker of it all was while she had thought the job would of been great (who wouldn't wanna try and tease and humiliate a pamper pooping cheer leading rival?) and she'd been paid up front for 3 months of service, she had quickly found out that she didn't have the stomach for most of the unpleasant duties that came with babying a thumb sucking drooly baby.
And that had been before Kim had fallen HARD for her and kept wanting to cuddle even when she was in a shit swelled diaper that had Bonnie trying not to hurl. trying to simply escape Kim or push her out of her lap was impossible too as despite her pamper packing life style Kim still had a dominant edge to herself and pound for pound was fair stronger and more skilled then Bonnie could ever hope to be.
Naturally she had tried to just quit the job, something that the possibles were fine with..as long as she not only returned what she had been paid (minus the dates she had already worked) but also paid a a added 20 percent for a inconvenience charge for leaving them high and dry.
Having already blown the money and her parents making it clear they weren't going to bail her out, Bonnie had been forced to keep the job, praying that sooner or later maybe at least her sense of smell would die off. 
It was said sense of smell and the sound of crinkling that alerted Bonnie to Kim's approach before the big baby said anything. Kim might of been a super spy but when you've gone and used your diaper and have extra crinkly pink diapers, stealth was no longer a option.
"Heyyy bestie! Guess what I did!" Kim giggled, throwing her arms around Bonnie and pulling her in for a hug, Bonnie's mouth on her shoulder and forcing the air out so Bonnie was forced to take a breath in to enjoy Kim's 'present.'
Bonnie gagged even as other students diverted away, anther side effect of Kim latching onto her like she had was people thought Bonnie was into this big baby stuff too, not to mention she had transfer stink on her after a babysitting session with Kim. 
Finally let up so she could talk, Bonnie shot Kim a look and then held her nose. 
"I could smell you coming, so I know what you did!" She snapped. 
"heh yay! That's because I'm your poopie princess!" Kim said, clearly losing any sense of shame the longer this went on.
Bonnie gave it a week, two at the most before she started to come to school in her baby outfits.
"Your something alright. Alright come on, let's go get you changed then get you home." Bonnie sighed, knowing that asking kim to change herself after the last bell had range would fly.
"Oh Gosh, about that.." Kim said and batted her eyes in a effort to look cute and adorable even as she smelled like a trash can. "Da silly big baby fergot to stock up her school diapies, all out!" Kim giggled.
"..So I'll have to walk you home..with you smelling like this?" Bonnie asked, her bottom lip trembling. the escort to the Possible home was her last chance to enjoy the smell of fresh air before the nightmare started!
"Hehehehe yupp~ I'm SO silly aren't I?" Kim asked and then leaned forever and planted a smooch on Bonnie's cheek while the other girl was frozen in despair. 

If Kim was bothered by the smelly mess in the back of her droopy diaper, she didn't show it as she held Bonnie's hand and skipped on the walk home. 
She had wanted to just slid the pants off and let everyone see she was Bonnie's good little present maker (a present Bonnie would love to send back) but Bonnie in a rare flash of brilliance (or self preservation, you be the judge) came up with a valid reason for Kimmie to keep her pants on. 
"Uh, pretty sure that would be breaking public decency laws. your a superhero right? you can't just pick which laws you listen to and which ones you don't." Bonnie had said, praying it would work.
"..Poopie you got a point." Kim huffed, pouting and stomping her feet for 20 seconds then was back to skipping. "Oh well, you'll get to see how big of a mess I made for you because of how much I like like you!" 
"Oh Joy." Bonnie grumbled.
"eee! knew you'd come around!" Kim giggled and planted a big smooch on Bonnie's face, getting snickers from a elderly couple on they're front lawn.
'Someone just shoot me now.'

If there was one semi thing to be grateful for when it came to being the possible's babysitter, it was that Kim's little brothers weren't big babies like her and while they of course had a interest in girl on girl like most boys their age did, when one of the girls was their big sister it spoiled the fun. 
as such they either kept to their room or found after school clubs to join so they wouldn't have to endure princess poopie's stink.
'which just goes to prove their little genius.' Bonnie thought.bitterly. 
smarter then her at least since they had apparently been offered the role of looking after their sister but had turned it down. 
"Alright stinky bitch, g-" Bonnie started to say, her hand moving to point to Kim's changing supplies she insisted be kept downstairs since no sane person would enter the big babies nursery without a hazmat suit. 
"Princess poopie." Kim corrected her and giggled. 
"..Princess Poopie. Please go get your changing supplies ready." Bonnie said, rolling her eyes.
"Ughhh again with changing me on the living room floor? I HAVE a totally awesome changing table in my room you know!" Kim huff then added with a wink. "and a nice soft crib~"  
'And there's anther reason not to go into her room.' Bonnie thought, backing up a bit but Kim closed the distance with hunters smile on her face.
"K-Kimmie stop right there. I'm the babysitter and ergo I'm the one in charge s-" Bonnie stammered out, back against a wall as Kim came in and put her arms on either side of Bonnie, smirking.
"Do you feel like your in charge right now Bonnie?" Kim asked, moving her head closer and her cinnamon breath helped cancel out the smell of her diaper. 
"N-No.." Bonnie admitted. 
"heh, tell you what, you give your poopie princes a big smooch on the lips..and I mean a GOOD one..And I'll drop going to my nursery for now and get the padding pad ready. Otherwise, I'll just put you over my shoulder and carry you upstairs." Kim chuckled and knowing Bonnie was trapped between two choice (and in place) Kim waited for her answer.
Bonnie whimpered, she had NO doubt that Kim could follow though with her threat with relative ease and shutting her eyes tight and pretending it was her ex boyfriend Brick (who'd dumped her shortly after her babysitting job started up) she puckered up and mashed her lips on Kim's, putting her arms around the big babies head and trying to make it good, all while counting down in her head from ten then pulling away..and having to smirk as Kim was left goofy face and shaking.
"That good enough princess poopie?" Bonnie asked, a flair of her old self coming though.
"Duuuh...Yup!" Kim giggled and true to her word she waddled off to go and get her teddy bear changing mat and the diaper ready.
"...I might have to rethink this whole no kissing thing if it'll help me get the upper hand." Bonnie mused to herself, never catching the impish grin Kim had on her face, and thus not finding out she was being played.

One smelly diaper change later and Kim was in just a thick pink and white diaper with Hello kitty on the front and a black halter top, her hair in pig tails and sucking on a paci as she laid on a blanket on the floor tummy down.
She was kicking her legs while sucking on a pink pacifier and drawing a picture with crayons since all of her school work was done while Bonnie was struggling with her math problems.
'Ok so if I add this and that.. then Y is.. Jesus what was wrong with just telling us what the fecking number were, who had the bright idea to replace then with number anyways!?! This is so st-' Bonnie was mentally ranting when a shadow fell over her noted book and she looked up to see Kim smiling, her paci hanging around her neck and she was holding out the sheet of construction paper she had been doodling on.
"I made you a picture!" the big baby coo'ed.
For being a stupid pamper packer, Kim had some skill at drawing as it was clear that the people in the picture were suppose to be her and Bonnie, but it also brought a blush to Bonnie's face as it had Kim in just a diaper (and a full on at that) kissing Bonnie and humping Bonnie's knee. 
"I Uh.. Thanks?" Bonnie squeaked out.
"Hehehe I knew you'd like it! are you gonna hang it on your fridge at home so everyone can see?!" Kim giggled and semi bounced. 
"I uh..don't think my parents would like that." Bonnie said, picturing the look on her folks faces if they came downstairs to get some milk and saw some rule 34 on the fridge door.
"Awww..but... but.. I worked super hard on it!" Kim whined, pouting and her bottom lip starting to tremble.
"A-ah! wait! don't cry! I would TOTALLY hang it up if I could, but it's my parents, not me!" Bonnie said, waving her arms.
As bad as a horny and stinky Kim was, a bawling one gets boogers and tears all over Bonnie's tops was even worse.
"-sniff- Promise you would if ya could?" Kim asked, the tears halting for the moment and Bonnie nodding her head over and over. "Then you won't mind putting it up in your room!" Kim said and gave a BIG grin.
'..Did I just get fucking played?' Bonnie thought to herself, but then out loud. "Ok, I will, but only if you promise no sob fess." 
"Deal! Oh and you hafa take a picture to prove you put it up!" Kim  said, folding the picture up and sliding it into Bonnie's backpack.

Some more TV and homework time and then Kim got up as Bonnie was putting said homework away and pushed Bonnie's backpack away and then pushed her back wards on the couch, sitting sitting up at least but a evil look in her eyes as she sucked on her paci.
"What the hell Kimmie, what are yo- Oh No." Bonnie started to snap, then saw the look in Kim's eyes.
It was pamper packing time and Bonnie was just 'lucky' enough to be Kim's favorite spot to fill her diapers to the brim. 
"At least let me get the clothes pin for my nose first!" Bonnie wailed and Kim just giggled and shook her head no, then plopped down on Bonnie's lap, her legs on either side of Bonnie and facing her. 
"..I'm about to get molested aren't I?" Bonnie asked with a whimper, since normally Kim would turn around so her butt was pressing again Bonnie's front.
Kim just giggled and let the paci fall out of her mouth as she leaned in and kissed Bonnie's cheek. 
"what do you think?"
"I need a adult!"
"You are the adult."

Sure, some SMALL part of Kim knew what she was doing was all sorts of wrong but she had pegged Bonnie from day one to be her new mommy and she hadn't of gotten as far as she had in life by being a quitter.
even as she mashed her lip's to Bonnie's as she let out muffled protests and whimpers Kim bore down down and her efforts were rewarded as a massive load started to fill the seat of her diapies, the smell not bothering her as she had trained herself to enjoy it and naturally she enjoyed the warm comfortable of her own soft serve coating her tight buns.
Plus adding in just how naughty it made her feel and well.. there was a reason she had gone full on big baby. 
"Mmm mommy mommy, Princess poopie is making you SUCH a big present~ Tell me what a good girl I am and squish my bum!" Kim coo'ed babishly, breaking off the kiss.
"G-Get your shit filled diaper off of my lap!" Bonnie cried out, putting up more of a fight then Kim had come to expect from her and making her frown.
"Look, this is happening. you can play along and squish my diapie and praise me and give me kisses, or I can push you onto the floor and bounce my butt on your face till you're smelling my poopie diapie for a week." Kim snapped, annoyed at having to break charter. "YOUR choice!"
Bonnie turned pale and whimpered, almost looking like she was the one who needed a diaper (now there was food for thought, the two of them as stinky princess sisters!) then she slowly reached around and started to pat and squish the still filling diapered rump. 
"G-Good girl Kimmie! y-your number one..at..going number two?" Bonnie said, voice unsure.
'Eh..I've heard better but she's working under pressure. She'll get better.' Kim thought and then switched back to happy baby mode. "Yay! fankies mommy! can I has kisses now?"
"Uh.. wipe your chin first?" Bonnie asked meekly.
"heh. Otay mommy!" Kim said, willing to give a small condescension and wiping her chin then leaning in and mashing lips with Bonnie, getting her tongue in the other girls mouth, only breaking the kiss as Bonnie's hand came off her squishy rump. 
"Who told you to stop?"
"S-Sorry!" Bonnie yelped and now it was both hands mashing and mushing her load around and Kim almost melted at the feeling, coo'ing and flopping into Bonnie as her toes curled. 

Bonnie of course had noticed the change in power and despite the smell asulting her nose and the faint taste of Kim's lip gloss on her lips, she smiled.
"Awww does my poopie princess wuv her mess squishes? Maybe instead of kisses I'll just mash your stinky bum~ would my stinky poopie princess like that?" Bonnie asked, smirking.
"O-Oh I-"
"Oh silly me, asking a BABY what she would like.You don't get to have a say in this, your just a big stinky baby." Bonnie said, taking a hand away to pop Kim's paci back in her mouth. 
the look of shock on Kim's face was adorable and Bonnie found herself starting to have a bit of fun with this as she went back to slapping and squishing Kim's smelly butt.
"I think for now on somebody is gonna be a good little chaste kiss virgin and just get her loving from stinky diaper pats. And she's gonna stop making silly threats to mommy if she knows whats good for her." Bonnie added.
Kim was too busy sucking hard on her paci and mewing behind it to offer up a argument, and hoping to keep the flow of power in her favor Bonnie ran with it. 
"From now on when we get home your paci goes in and stays in unless your eating numn nums or drinking your ba-ba..Little babies should be seen not heard." She added and Kim was making lots of noise at that. 
"If you agree to that, if really want me to make you my helpless baby girl, go ahead and make a big girl mess in your poopie diapies poopie princess." 
Kim clearly didn't need to be told twice and shuddering in Bonnie's arms 'agreed' to the deal, flopping down exhausted afterwards and eyes struggling to stay open. 
before Kim drifted off to sleep all the big baby super spy could think was ' At what point exactly did I lose control here? and why how come I didn't do it sooner?'

The end