The Start Of A Big Wave

by Archy

Rating: mature
Tags: Anthro, Original Character, My Little Pony: Friendship is Magic, Fetish, Slice of Life
Length: 4670

Urban Wave had no idea what she would be in for when her jealous older sister casts a spell on her, but the young mare suddenly finds that she gets a lot more than she bargains for when her lower portions start to get much larger than normal.

Urban Wave had no idea what she would be in for when her jealous older sister casts a spell on her, but the young mare suddenly finds that she gets a lot more than she bargains for when her lower portions start to get much larger than normal.

Story commission for Urban Wave, an sorts of origin story for their OC as to why she is the way she is. Want your own story? Check out my journal for info.

Cover art by robertge.

Published 2018-03-11 21:50:07 UTC
Last updated 2018-03-11 21:50:07 UTC

The Start Of A Big Wave

Chew...chew...chew…

It was another run of the mill family dinner. Urban Wave twiddled her fork as she stared into the rather boring bowl of spaghetti. For some reason thursday night was always pasta night, she was never sure why it had become this way. But every thursday, the family sat round the table and ate something that required far too many twirls on her fork for her liking. She could see her reflection in the steel as she held it with her hand. A young pony, slim, pretty. A gorgeous light blue body with darker blue accents towards the end of her arms and hooves. Her wavy hair and tail was a much lighter blue, but it still carried those darker highlights in it. She wondered sometimes about genetics and how ponies got their colour, she was certainly a lot brighter than the rather gloopy looking strands of spaghetti she had wrapped around her fork and took a bite of it with a total lack of enthusiasm.

“Wavey.”

“Hmmm?” She looked up, her father - a rather stout and stern looking stallion was giving her a beady eye as he watched her mess around with her dinner.

“Eat your dinner please, and stop messing around.” He said with a slight tone of disappointment in his voice, before returning to his own bowl of food. She couldn’t remember the last time he smiled at her.

“Yeah Wavey.” Her older sister piped up, why did she do that? Why did she always have to put emphasis on her name? Like it was something dirty that she just had to make fun of. She hated it when she did that. It was odd though, her older sister was giving her a glare. Like there was something else wrong. She just sighed.

“What, have a I done something else now?” Her tone rather flat as she looked at her older sister across the table. “Seriously I’ve been at school all week. I’ve hardly had any time at home, what could it possibly be? And don’t say nothing because you’ve been giving me a sharp look all evening.”

“Oh please! I saw you at lunch today! And you seemed so oblivious to it as well, you’re one to play hard to get Wavey.”

Urban dropped her fork in her bowl, she had had enough. “What, WHAT was I doing at lunch? You’re the expert, you tell me!”

“So you’re telling me, you just completely failed to notice all those boys just gawping at you. They couldn’t take their eyes off you the entire time! And you just sat there, eating. Not a care in the world!” Her sister shot back, her voice becoming raised as she pushed further into her tirade.

“WHAT?” Apparently she had not only had enough, but wanted to give back to her sister in kind. “P-please! I don’t even like the stallions at school!” She stuttered slightly, it was a little unlike her to lose her nerve. Her older sister just laughed in response.

“Yeah right, and I’m Princess of Equestria.”

“Actually…” A third voice of Wavey’s younger brother sitting next to them started to speak, but she quickly nudged him in the ribs to keep him quiet. “H-hey, what was that for Wavey!?”

“Nothing, eat your spaghetti and don’t bother. This is between me and her.” She growled, her voice low. The family went back to silence as dinner continued. Her older sister wasn’t done however.

‘You’re not the only unicorn at the table Wavey, and this spell...this will make your head spin. And you’ll never even know it was me. Not as long as you live. I’m sick of you getting treated so much better than me just because you’re younger and cuter.’

There was a very quick, and almost very dull flash from her older sisters horn. Blink and you would have missed it. The spell itself wasn’t even difficult to cast, but she had come across it in the library of school one day and memorised it. Almost unique in its nature and she knew it would come in handy. Her poor dear sister, she’d be heavy, just without the benefit of a pear shaped body.

Nopony noticed the cast, all too distracted by the meal. It would be her secret, at least until it started to take effect. Then she might just have to let out a laugh or two. She decided to tease her younger sister a little more in the meantime.

“Anyway, I don’t know what they see in you. I’m the older one, I can treat them how they expect to be treated.” She said with a little coo in her voice, their father looked up from his bowl once more.

“Please, some of us are trying to eat. I’d rather you didn’t insinuate lewd actions or thoughts at the dinner table dear.” He said rather gruffly. For the next few minutes there was silence, interrupted only by the clinking of forks against chinaware. When dad spoke, his word was final.

Urban sat there, feeling more and more upset as the meal went on. Her sister could be a tease sure, but she was never usually this mean. She wished she could scream across the table, yell right in her stupid face that she wasn’t interested in boys and that she wanted nothing to do with them. If anything, she was hoping some of the girls noticed her in a way that was more than just a friendly interest. But only her younger brother knew and she had swore him to secrecy. If mum and dad found out well...that would be a disaster.

Her ears suddenly pricked up from their usual resting position. She swore she heard a slightly audible creaking from under her. But nopony else at the table looked up, all eating. She dismissed it and carried on.

But then there it was, a few moments later, another creak. Louder this time. A few heads came up from their bowls. She blushed. No words were spoken and the family went back to chewing.

Creeeeeaaaakkkkkkk

Everyone stopped eating and looked at her. Wavey blushed even harder. “I-I don’t know what that is, why are you all looking at me?” She practically squeaked.

“It’s coming from your chair…” Her older sister said with a smirk, quickly wiped from her face when their father shot her a disapproving glance. It was his turn to speak.

“She’s right though, if blunt. That was rather loud.”

“M-maybe the chair is just creaking? I mean they are kinda old.” Wavey continued to blush, the chair however, continued to make noises beneath her.

Crreeeeeeaaaakkkkkkkkk

“Oh c’mon! What is going on?” Her blush deepening, she wiggled her hips slightly to see if it really was her. Apparently that was just too much.

CRUNCH!

The entire chair gave way, splitting into 1000 splinters of wood beneath her, as if some great big fat mare was perched atop the seat. She yelped in surprise and before she could react she crashed to the floor with it, the table and her family disappearing from sight as she fell down.

Everyone was astonished, except her older sister, who just let out the loudest laugh she could, practically doubling over at the table and banging her fist almost like a cartoon on the surface. “O-oh my gosh Wavey, that was the best thing I’ve ever seen! How did you do that!” She giggled in delight as her younger sister picked herself up off the floor and dusted herself down, making sure she was okay.

“W-what do you mean how did I do that? I didn’t do anything! The chair just gave way under me!” The poor mare said, utterly embarrassed. “It must just be old, I mean we’ve had them in the house forever!” Her tone a little unsure of herself. That had to be it, stupid thing was probably just old and gave way. She had hardly moved! “Anyway I’m done, thanks for dinner b-but I got some studying to do. I’ll be in my room.” She huffed, and went upstairs to do some work, leaving her family behind and rather baffled. Except her older sister, who had the biggest smile on her face.

-

“Hmmmm….”

Urban always had to squint slightly at the plans. Why oh why did ponies print them so small? She knew there was a crazy amount of detail in each one but my oh my did it make for difficult study. She picked the paper up and held it inches from her face, she was staring at what was obviously a small city block but the detail on it was like nothing she had ever seen before. There was just so much to take in. Shame it made the paper it was printed on almost impossible to decipher. The young mare loved urban planning, fortuitous her name reflected it really.

She sighed and placed it back on the desk she was sat at, letting her arms fall to her side in defeat. But as they fell they hit something rather firm. She looked down, her eyes widening in horror as she observed her body below her waist. It was...expanding?

‘W-what? I didn’t look like this when I came in...even at the dinner table!’ The mare thought to herself. ‘What is this?’ She observed her hips, they were definately wider than before, not massively so but certainly getting to a point where before long it would be very obviously visible.

She tried to pre-occupy her thoughts by going back to her studies. Suddenly that far too small print on the paper was very interesting indeed. She stared at it in great detail, but her mind was nagging at what she thought was happening. ‘Don’t look down Wavey, just don’t...it’s a bad dream, or something playing tricks on your eyes. What I think is happening can’t be happening can it?’ She couldn’t help it any longer, she had to look back down, forced to by her thoughts and feeling something pushing into her side.

“G-gah!” The poor mare yelped in shock, her hips had widened even more so, her blue body pushing outwards as the spell her older sister had put on her was taking more effect. It was visible though this time, although Wavey had no idea. What made her yelp though wasn’t how wide and plush her posterior had become, but that she was sat in a desk chair and now her cheeks had become rather well, wedged in it. It was just she was a little worried she’d be stuck in it, she couldn’t stay sat here forever! The expanding really was starting to get to her.

She tried to heft herself forward a little, the chair just came with her. She felt her sides pull the chair with her movement, she really was wedged in it. Her mind started to do little mental loops of frustration and embarrassment. Frustration she hadn’t looked again until she felt she was wedged, embarrassed that she was completely stuck in a chair that only ten minutes ago she had plonked herself in with no issue.

‘C-c’mon Wavey, pull yourself free...you g-gotta…’ The panic starting to set in slightly as well. Unfortunately her frenzied movements and wobbles meant the rather well used desk chair like the dining table chairs befell the same fate.

CRASH!

For the second time in the night, Wavey hit the floor hard, although at least this time she had a slightly softer cushion to land on. Her now rather wide rear absorbing most of the impact. She winced a little still as she did before though, it was still a rather abrupt trip to the floor.

“Ahhh...that hurt.” Not often did Urban speak to herself but on this occasion it felt justified. She put a hand on her hips to give her even more bruised butt a rub, still forgetting that it was just getting bigger and bigger behind her. Her palms came into contact with it a lot sooner than she expected. “Oh...right.” The talking to herself kept up it seemed, she hoped whatever was happening wasn’t making her a little crazy as well.

The mare stood up and observed the wreck of the chair, it was no good. No way that thing was being pieced back together, it was completely destroyed. Her massive rear had really done a number on it. There was little left, she’d have to dispose of it later. Oh well, at least she finally had an excuse to replace it.

As she stood she was feeling her clothing tightening too, she realised today probably wasn’t the best day to wear those jeans that also doubled as a pair of booty shorts. Jeans were not the most stretchy material in the world. Still the mare never imagined she was going to apparently get an expanding butt that didn’t seem like it was going to stop expanding any time soon. She had a long mirror in her room and positioned herself in front of it.

Wavey laughed a little, the booty shorts were very quickly becoming booty panties as her butt was pushing out from within them. What else was she meant to do? This was just an elaborate joke! Probably put on by someone. “Okay, you’ve had your fun! You can stop now. I get it!” She said, hoping either her sister or brother might spring forth from her closet yelling “Gotcha!”. But they didn’t, in fact she had left them all downstairs still cleaning up the remains of dinner. Why would they?

Worry really started to set in now, the jeans tugged tighter at her waist and at her butt cheeks as they got bigger and bigger. She reached down and frantically fumbled with the button to try to at least get them off but there was no give at all, her wide hips had pushed out so much she couldn’t quite get the button through the hole that kept it in place. They were totally wedged on her ass.

‘O-oh dear....’ There was almost a cartoon like creaking noise as she felt the button push into her flesh as her hefty bottom half continued to grow, luckily she had turned sideways from the mirror to get a better look. The button finally gave way and shot off with a PING as the metal embedded itself into the wall. The jeans stayed stuck firm on her butt though. At least the button was off, perhaps she could tug them off. Urban gripped hard on the material but, still no give. How on Equestria was she going to get out of these shorts?

Thankfully the material was just no match for her flank, and the rather frantic tugging she was doing on them had weakened the material somewhat.

SHHRRRRIIIPPPPPP!!!!

The pair of jeans became a literal pair as they ripped into two pieces, right up the side of her hips as her widening sides searched for more room. They quickly fell to the floor.

Bwooompphhh!

Well that was a new noise! But with her ass free to continue to expand unopposed it almost made a noise of its own to signal a sigh of relief at no longer being trapped and her underwear wasn’t going to pose much of a problem, that was at least rather strechy. Urban herself was now blushing profusely as her massively wide eyes just observed what was going on below her. She couldn’t help herself but stare at her flanks, the only word for it was rotund. Her two rear cheeks forming a perfectly bouncy circle beneath her as they continued to grow and grow. She turned around, instantly feeling them brush against her dresser and then the mirror as she moved. Her massively wide hips knocking into things.

She made a quick mental note to be more careful. ‘Please for the LOVE of CELESTIA stop growing! How much wider can my ass get!?’ Wavey thought slightly panicked as she continued to almost dance on her hooves and worried. She had absolutely no idea what to do apart from pray that her ass would stop expanding but it simply wasn’t. Wider and wider it was getting, she continued to put her palms on her side, feeling them. She blushed.

It was strange, yes she was worried but well, it felt good too. She had no idea why, but she bit her lip a little as she ran her palms over the curves of her rear and gave it a little push with them. It wasn’t only big but it was firm and slightly squishy at the same time, as if holding its own shape with some tautness but good to the touch. She couldn’t help but feel a little pleasure out of it. It still didn’t feel right logically but her senses were telling her otherwise. For some reason the two wrecking balls that were appearing beneath her felt good.

Wavey blushed again, but not from embarrassment this time. It was that other thing that made ponies blush, she was feeling it rather a lot, just running her hand over her ass was making the feeling much more apparent. What brought her back to the present was her feeling it push again into her dresser and this time it wasn’t from her turning around. It had blimped up so much now that it had just pushed into it on its own from its sheer size alone. It was becoming much harder for her to move around as well, her room wasn’t massive so quickly she was finding the one thing that was massive was bumping into things.

This was really getting out of hand. Okay she looked utterly ridiculous but if she stayed in her room she might end up destroying it. It wouldn’t get that big would it? She didn’t want to take that chance. One thing she had completely neglected, getting out the door. Obviously it wasn’t as wide as her room. Oh dear...

The front of Wavey made it through the door, but the rest of her certainly didn’t. Her extra wide hips were now much wider than the frame. She couldn’t even go sideways out the room as her cheeks had taken that rather round shape, they were easily as big behind her as they were wide. She tried pushing forward as best she could, but all that seemed to do was wedge her even more and her ass was still expanding behind her at the same rate.

“Oh no, no, no, nono!” But her upset cries of realisation went totally unheard down the hallway of the house. The rest of the family likely now preoccupied with the TV or something else. Meanwhile her ass just kept growing. She could at least still turn to see what it was doing behind her despite being wedged. Although maybe it wasn’t so bad if they didn’t come to her rescue right away.

Her rear was practically ballooning. Her flank just getting bigger...bigger...bigger. Before long she watched as it started to fill the entire room. Furniture started to get pushed to the side, the remains of the chair quickly vanishing under a sea of blue butt. Her desk, bed, dresser. It was all rather suddenly disappearing behind her. She bit her lip again, this was becoming a nervous habit as she observed her butt in real wrecking ball fashion start to utterly wreak havoc upon her room.

Crunch! Crash! Smash!

Her desk was pushed into the wall, her bed was crushed underneath her buttocks, the mirror well - it was only glass. It was hardly likely to put up much resistance against her fatty flesh. Books tumbled down from a shelf that was up on the wall, no longer as they fell and would have crashed into the floor but they simply came to a rest on top of her butt. It wobbled slightly in response.

Suddenly she felt a breeze. ‘The window! W-wait, the window!? Oh gosh I hope nopony is outside on the street. They’ll see me!’ Her ass continued to grow, more and more. Her fat and blubbery ass now completely having filled the room and starting to hang out the window a little. Urban just went back to panic. ‘Oh my gosh, please, STOP!’ She thought.

And almost like magic it did. She wasn’t sure if it was the thought but suddenly she felt her rear stop expanding. Sure it had filled the room but well, at least it wasn’t going to bring the walls crashing down or wreck the entire house. She had to get help.

“MUM? DAD? ANYPONY? I’M STUCK!” She yelled and finally she heard the door to the living room open with a click. Then her ears twitched as she heard a number of pairs of hooves making their way towards her.

“Urban? What is going on? Are you having a party...in...there….” Her dads voice just trailed off as he saw his daughter utterly stuck in her room with what appeared to be a sea of blue behind her and nothing else. “What happened!? How did you do this!?”

The poor mare felt utterly ashamed, her family staring at her as the big bottomed girl tried to wiggle herself free once more and failed. Her stutter that she often did when she was feeling this way came back as she tried her best to explain. “I-I don’t know dad! If I d-did do you think I’d have s-shouted for help? W-what do you think? I just decided a giant room filling ass would be a f-fun idea?”

“Wow Wavey, I mean I know some guys like big hips but this is ridiculous. You’ve got a flank big enough there to crush a car.” Her older sister just smirked. Wavey shot her a glare that could have killed a stallion at twenty paces.

“Now is not the time. Your sister needs help.” Her father said, somehow he always managed to keep a calm and collected head. Even when faced with something like that which was well...something he’d never seen in all his years as a parent.

“She needs help alright. A diet perhaps? I mean how does everything go to your hips? I’m impressed.” Her older sister continued, she was enjoying seeing her sister struggling a little. It was most amusing for her. Meanwhile Wavey just glared at her, still unable to move.

“Are you okay? I guess you tried to get out and it got worse?” Her younger brother asked. He seemed mostly unphased, although he was staring like the rest of them.

“C-course I tried to get out. As you can s-see, it wasn’t very successful…” The blue mare moaned. Her father though had gotten a phone out of his pocket and was dialing a number. He asked her a question while it rung and he waited for somepony on the other end to answer.

“The window is open right? Are you um...out of it at all?”

“Yes dad, a little. At least I think so. I can feel it anyway.”

“Good.” On the other end of the phone somepony picked up. “Hello, Unicorn Emergency Services?” At that point he walked down the hall. “We’ve got a problem I think only you can help with…” going out of what Urban could hear before she protested.

“Aw dad, please not those guys! More ponies will see!”

“Do you want to be stuck like this forever dear?” Her mum asked.

“Well no, but you know...it might fix itself. It stopped growing at least.” Wavey replied.

“Well do you think it will shrink?”

“I-I dunno.” She said sheepishly. Clearly the poor mare had no idea and she resigned herself to taking her father's advice, Unicorn Emergency Services it was.

-

A few hours passed. Firstly when the team of help arrived there was some confusion until they got inside the house and could finally see what they were dealing with. Poor Urban just stood there, still wedged in the door with her head and eyes firmly focused on the floor. She couldn’t look any of them in the eye, answering what questions they had with a simple “Yes.” or “No.” as best she could. After they finished their questions they had retreated to the living room to discuss with her parents what they could do. Her father came back and explained they had a spell to shrink her but it might not totally work as expected. Anything was better than this though and Wavey accepted.

It took the combined effort of three of the Unicorn Emergency Services to cast but the spell was quick and painless, within moments Urban felt the breeze go and her rear start to shrink. It shrunk at a much faster rate than it had expanded.

Finally after what seemed like an afternoon of total embarrassment, Urban was back to normal.

Mostly.

As the team had explained to her dad, there had been a small side effect. Her ass hadn’t shrunk totally, it was still big. Just not as big as it was. The room filling size had been absolutely ridiculous, she was just pleased it was now back to something more manageable, if still a little big. Her hips were nice and wide, her butt was still a nice big size (at least, she thought it was, but she didn’t dare say anything) and her thighs seemed to have compensated slightly as well to support her new bigger butt that wobbled behind her as she stood and got used to it, finally able to fit through the door and get out her bedroom. The carnage it had left behind though was rather devastating. She’d have to get her room sorted out before the end of the day.

Although Urban had done her best to answer the teams questions, they had no idea why this had happened to her. Nothing she had done apart from the chair breaking at dinner seemed out of the ordinary and even that could have just been a coincidence. They really were baffled. Her older sister just kept her mouth shut the entire time, there was no way she was going to tell any of them it was all down to her. Finally they left, there was nothing else they could do.

The smirks from her sister though, Wavey couldn’t put a finger on it but she just had some inkling that it might have been something to do with her. She was unusually mean at dinner and some of those comments she had made had been rather cutting earlier. She also spent the entire time smirking at her like she had won some sort of mental medal for doing something.

Wavey just thought back, throughout the whole ordeal she had been woefully embarrassed. But she had also felt something else. ‘I-I was enjoying...why? Why was I enjoying being that size and shape so much?’. Maybe it was the shape...or the heft of her body, specifically her ass and her hips. The enjoyment she felt when she had run her hands over her massive flank, but the way she felt about it. The growth she experienced had been very enjoyable, her body expanding under her. But she was still unsure. She liked it yes, but she never dared to tell anypony. She had no idea how they might react. For now it was the keep it to herself.

It had been an interesting day though, Wavey was a little sad that rather impressive flank was now reduced to something more realistic, but her mind was already starting to whirl a little as she wondered what she could do with it. She had liked the feeling, in fact she still liked the feeling and as she ran her palms over her wide rear once more she started to think about what other fun was possible with a big butt like hers, maybe some of those girls might start to take note of her after all...