Big Heat

Story by iplank on SoFurry

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Ava's little sister Maeve has grown jealous of all the friends she has and turns to magic to try and solve her problem. Unfortunately Maeve's prowess at manipulating magic does not compensate for her general lack of life experience and her sister is the one to pay for it.


(F tf macro[sort-of] bitch)

In the city of Fathach Beag, two Fae sisters grew up quite close to one another. The elder sister Ava always looking out for and playing with the younger Maeve. Maeve remembers building forts out of fallen leaves in the fall with Ava. In the winter they helped collect and melt icicles around fires to prevent them from falling from the trees overhead and damaging buildings, and the fire light through the ice cast strange dancing shadows. In the summer they would play hide and seek in the gardens among the fruits and vegetables that were the same size or even bigger than themselves. In the spring, they would giggle among themselves comparing their wings to those of butterflies that stopped by the flowers that grew around the city outskirts. But that was also where the divergence started.

Ava was quite popular among the students of her school, and she was studying to be a lapidary- identifying and refining precious stones into even more beautiful works of art. She had very little magical prowess...at least by Fae standards- and those standards were admittedly quite high. Maeve was quite good with magic for her age, so not only was she studying a different path, their age difference distanced the sisters further still. Ava still tended her sister when she could, but it a petty amount of time compared to how they used to mingle. Fae wings dissolve in liquid, growing back a day or two later once again ready for flight. If a Faerie kept their wings though, they grew larger and more impressive the longer they remained- defaulting back to transparent dragonfly-like wings when regrown. Ava had her wings in pristine condition for quite some time so by now they looked like beautiful stain-glass, black, deep blue, and pink. This gained the attention of many of her fellow students who admired her, and then fell in love with her personality. This unfortunately meant she had a busy social life outside of classes as well- further dividing her from her jealous little sister Maeve.

So Maeve did the only thing she knew to solve the situation- magic! She took to her magic tomes to see if she could find some way to force her big sister to pay more attention to her! Then she would have fun like the good old days and not want to be apart from Maeve willingly or otherwise. Maeve was still fairly young though, and while she was good at magic for her age...her repertoire was still a bit lacking. Magic books were not hard to come by in a city of Fae, but many contained concepts or words Maeve did not even know. There was an entire section dedicated to sex and lust spells and she didn't know what either of those words meant! Eventually she settled on a book of transformative spells. Maybe there was a spell to transform her sisters thoughts into ones of Maeve? No, the book did not have those sort of transformations. Almost entirely animal transformations, but Maeve did smile as she seen a section dedicated to canines. According to the book dogs were very loyal creatures, dedicating themselves to their pack above all else. Maeve was Ava's pack! Dogs were small-ish four legged creatures and looked cute enough. There was spells for different breeds, and for some reason there was two near identical ones for regular female dog and 'bitch'. Maeve did not know the difference, but bitch had its own specific title so she assumed that was the more prestigious one.

Ava twirled in the long mirror on the door to her room, admiring the dress she was wearing. There was already another four laying out on the foot of her bed she had already tried on. An outfit for every occasion, and a lot of important Fae were also pretty vain so faults in your appearance could hurt your standing rather quickly. Her smile faded a bit as she felt an odd tingling sensation pass through her body that almost settled into an itch on the surface. She puzzled over what that feeling could have been as she also noticed she felt unusually hot. It felt as though the entire room was heating up quickly, but how could that be? She had to brush her hair away from her chest because it was adding heat on top of her breasts which already insulated her front just fine on their own. That was when she noticed her nails had turned into claws! Not even sharp claws either, they had blunted tips. She wanted to take her stockings off but only bent over and groaned at the increasing heat. No, it was certainly internal temperature she realized- especially in her crotch which was starting to twinge in need. She liked what she seen in the mirror but not THAT much! It was quickly getting difficult to think straight, but she did see in the reflection her ears were growing, a bit longer and a lot wider. Fae ears were already long and pointed but also very slender, now they were becoming rounder and starting to flop over from their increasing weight. She slipped a hand into the slit up the side of the dress skirt and snaked its way under her panties to press in on her fattening labia, feeling the heat against her hands, and moisture. She moaned again at the feeling and panted a bit, leaning against the mirrored door with one hand and massaging her other hand over her pulsing pussy. Ava was unable to tell apart from the strong pulses of pleasure that her tailbone was growing out, hooking around the top of her panties and then growing down the inside of the skirt, quickly gaining a fuzzy coat of fur as it went.

Her toes curled and her feet stretched out as she lifted herself onto the front of them, seemingly from pleasure. In reality she couldn't have stopped herself from doing that regardless because her actual feet were changing structure! From the ankle down bulked and stretched, causing the tops of her stockings to migrate farther and farther down her leg, unable to contain it all properly anymore. The bottoms widened greatly as her toes fattened and grew claws as well. The much broader feet with puffy padded skin on the bottoms strained the shape of the stockings as it was, so when the claws started to grow they immediately popped holes in the ends. Ava was working her nethers rigorously now, hooking her fattened fingertips into herself as she rubbed. Her entire body tensed with each inward push and her breathing was becoming ragged and her moans sharper in tone. Her mouth hung open in lust so she hardly noticed her tongue was actually much larger than it was supposed to be, and a bit flatter than normal. Her panties were already moist, but she squeaked in a desperate orgasm and completely soaked them, staggering back off the door a bit finally realizing something was vastly different about her leg structure. The entire room seemed a bit off making her feel like she was going to pass out, but she did not. What was actually happening is the range of colour her eyes could perceive was becoming more narrow- she was losing her ability to see certain colors. Her horniness also did not go away, at all. If anything the orgasm made her hungrier to have another! As soon as she hooked her hand around her fat labia though the tensing muscles in her arm expanded tremendously as her hands became giant paws. She held both arms out in front of her, staring at them while still panting. They were huge! From her elbows down her arms almost tripped in width! She felt her feet expand the same way, and they became even a bit larger than her hands had. When she looked down her balance was thrown off again and she hunched way over, feeling fur quickly growing on the top of her back and her spine started to groan and pop as it expanded, and then her rib cage.

Ava panted loudly, letting a bit of drool drip from her tongue- too desperate and horny to care what she looked like right now. As she alternated from heavy breaths to groans her teeth all turned to fangs and her tongue got a bit longer, and the end of her nose started to darken. Her dress was so tight! Her body was trying to catch up to her over sized paws. Her panties dug into her even fatter darkening labia causing her to stagger back and forth, squirming around on her feet trying to find a position where it wasn't digging in. Her dress started to shred at the seams and she could not take the heat anymore, grabbing into the fabric with her claws and ripping the front of the dress completely apart. She yipped in surprise of her reflection when tearing her dress open revealed six smaller breasts under her original two! Now less restrained her entire body started to grow, making her paws less giant in proportion. Her tail involuntarily wagging tossed the remnants of the clothing off her while her expanding torso popped the clasp on her bra. Ava went to run the soft pads of her front paws down her many tits and yelped at the sharp pleasure, immediately skipping them and ripping her panties off in desperation. Her pussy was tremendously puffy, and almost pitch black! It had taken on a triangular shape more familiar to canines. Without even turning around her eyes locked with the tall round bedposts behind her- in the reflection of the mirror. She staggered back till she felt it on her lower back, then stepped up onto the bed to lift herself high enough and lowered the large sphere on the top of the bedpost into her pussy and started pistoning up and down, rocking her hips back and forth at the same time. She rolled her huge paws over her many tits, twinging the nipples up and down. Her tongue lolled out the side of her mouth as her face started to stretch as she groaned and panted from the sensations. Her nose became dark and wet as the fur starting on her forearms and back started to spread across her entire body like wildfire.

Ava grunted as she looked down in frustration at the bed post- it was too small for her. Or more accurately, she was too big. She no longer hand to hold herself up on the bed, she stood tall enough to easily get it in her and the bedpost wasn't doing anything a single finger from her could already do. She started rapidly rolling her finger over her fat black pussy to try to aid the post. Her head hit the light on the roof only a moment before it hit the roof with a dull thud. She was as tall as the room! She tried to bend forward to give herself more room but her spine and joins had been slowly shifting position and it was too difficult to stay upright now, so bending over caused her to fall completely onto all fours. The let out a long whine before slamming her pussy back and engulfing an entire corner of her bed in its plush folds. She thrust back against the bed, which was slamming against the wall with enough force to crack it. Her weight was starting to bend the floor down and the entire level of the building was starting to creak as she shifted back and forth. She had another orgasm as the top of her head was pressed forcefully into the door frame and she jammed backward aggressively from the orgasm, causing the entire bottom of the bed to enter her! Her body groaned and bones popped into new positions as she had another large growth spurt and the bed was forced further into her as she expanded across the floor, till she was touching both walls and the entire bed was basically inside of her. The door creaked and blew off the hinges across the hall and Maeve quickly dashed into the hall from her room in surprise, not entirely knowing what was going on herself. The walls started to bend outward and Ava's feet smashed through the roof of the floor below, she was outgrowing everything. Her pussy was clenching and spurting on its own, even though the bed was becoming too small for her as well.

Ava felt the tips of her paws touch the furniture in the floor below and without thinking lurched forward to get her footing, causing her face to smash through the hall and the floor of the rooms across from hers. All the splintering wood and tile was abrasive on her furry face causing her to recoil, staggering out through the side of the building, ripping the entire side off of all three floors as she fell into the street. Ava could not think through the hormones and as soon as she got her footing on the cobble road she thrust back and ground her pussy into the corner of the building, causing the entire remainder of it to rock back and forth with her thrusts as her juices ran down it and pooled on the sidewalk. Other Fae gathered in shock, trying to figure out what was going on- Ava was 90% canine at this point and not at all recognizable as having ever been a Fae. Maeve just stood in the sundered hall in shock, not sure if she should say or do anything, at risk of others knowing she did it. Ava climaxed again, firing the bed out of herself as she was forced to turn her head against the building across the street- quickly running out of room again. She had the flexibility now though to do what few species could- she rolled into a ball and licked her own pussy, falling backward just as she ran out of room, causing her back to scrape off sections of the wall of buildings on both sides of the street at the same time. As she thrust into her own face and writhed in the street she unknowingly started to destroy two entirely new buildings because she was much larger than the street itself. Another powerful orgasm started to rocket through her till she convulsed violently, throwing her head back and howling as she exploded pussy juice down the road soaking several onlookers as she completely her transformation into a complete bitch. Still panting heavily, she slowly turned to look at Maeve with her teeth bared.

Maeve had not been outside of the Fae city to know what the outside world was like. She did not know the Fae people were tiny. The book said dogs were fairly small animals, but she did not realize the illustration was of a dog and a human, not a Fae. To Faeries dogs were absolutely huge. Well, Maeve may have to spend the next several years worth of chores to make this up to her elder sister. At least they would now have to spend more time together...that is, if Ava didn't want Maeve to tell everyone who the giant horny mut was that wrecked a city block with her cunt.