Flutterplant
Since the discovery and restoration of the Tree of Harmony, Fluttershy had noticed a change in the temperament of the Everfree Forest.
Sure, it was still wild, and still had that unsettling blend of things-happening-on-their-own-that-somehow-worked-out-okay-in-a-chaotic-sort-of-way, and Poison Joke hadn't lost any of its mischief, and the creatures of the Everfree could still cause you trouble if you caught them in a bad mood, and it was still a bit risky going in at night, but on the whole, the Tree of Harmony had managed to spread a little peace in that once-forbidden zone, at least in its immediate surrounds. Fluttershy had gone in there with her friends several times over the last year without incident.
It made for noisier sunrises at any rate, now that birds were feeling more comfortable about roosting there. Fluttershy loved being awoken every morning to that avian cacophony.
She never realised that the forest's new, more benign attitude would cost her everything.
It was a Wednesday, but that doesn't really matter, as the incident could have happened on any day and the result would have been the same. The path between Ponyville and the Ancient Castle of the Two Sisters was starting to become better established, and Fluttershy had taken it upon herself to ensure that it wouldn't encroach on the habitats of any poor creatures that might live on that route. It wasn't that she wanted to stop ponies coming this way - she knew that was going to happen, regardless - so the best she could do was direct the route so that it had the least impact on its surroundings.
"Oh, I know, Mr Sawbeak," she said to the fierce-looking black bird that was glaring down at her from the thin branches of a nearby tree, "and that was very rude of her! But I know she didn't mean to disturb your roost. She just didn't see it!"
The bird jabbered its dissatisfaction with this answer. Fluttershy looked sheepish. "I'll talk to her and make sure she doesn't disturb your roost again. That's why I'm here today! I'll make sure ponies know to go around your tree."
The bird clucked agitatedly.
"And also to keep the noise down," Fluttershy murmured.
Fluttershy hmmed, and wandered off-path, trying to figure out how wide a detour would be needed. Regardless of Mr Sawbeak's protests, she couldn't bend the path too far, because (a) that would inconvenience too many other creatures, and (b) Rainbow Dash - or anypony, really - would probably just cut across anyway.
She'd just figured out the perfect distance when her nostrils were filled with a yummy smell that she hadn't expected to smell out here. It smelled like caramel and cream, as if glorious desserts were being eaten all around her. She wondered if Pinkie Pie had snuck into the forest behind her to serve some refreshments, which wouldn't be too unlike her. But, a quick inspection showed nopony around. She sniffed and followed her nose, wondering if it was a flower that was producing the heavenly scent.
It turned out that it was. Fluttershy found herself face to face with a vivid green flower that she'd never seen before. Although plants weren't her expertise, she was familiar with many different kinds, as they were a great source of ingredients for medicines and poultices to treat her injured and sick animals. This one was conspicious in its... well, conspicuousness. It wasn't anything she recognised, but it didn't look like anything that could hide, either, which suggested to Fluttershy that it was a newcomer to the forest.
Whatever it was, Fluttershy certainly didn't mind its presence, if it produced that kind of smell. It made her feel happy and nostalgic. She examined it more closely, counting the petals and leaves so that she could look it up when she got home.
"Oh!" she giggled, as the flower puffed more of the scent at her when she got close. It was certainly a friendly little thing, with the way it was gently slithering vines around her forehooves... and her hindhooves too... she blinked a little at that... it was quite the mobile little thing too, it seemed.
Fluttershy didn't generally bother speaking to plants, as she knew they had nothing like the intelligence of a creature. Nonetheless, this one was overstepping its bounds now, so she felt like she had to say something. "Um, Mr Plant... or Miss Plant?" she said, tugging against the vines that had wound up to her thighs, and were still continuing to do so. "Mr or Miss Plant, I don't want to injure you, but I really must get on... could you please let go?"
She had hoped that her tone would be enough to convince the plant, if not the words, but it seemed to pay them no heed. Fluttershy felt a little bad... it was a beautiful plant, and the only one of its kind she had seen... she hoped there were others nearby so that it wouldn't matter too much that she was about to damage this one...
Something slithered up between her legs and parted her labia.
Fluttershy froze in shock. Did that just happen? She took a moment to consider it, and concluded that not only did it just happen, it was still happening. That slithering, leafy feeling against the warm, soft flesh of her vagina was definitely continuing to happen, and was, indeed close to tickling directly against her cervix.
"Oh... m-my!" Fluttershy stammered, her cheeks going so red, they were practically visible in the dim light of the dense Everfree canopy. "M-M-Mr Plant!" she added, for she was a little more sure that it was a Mr, now. Fluttershy had never had a partner before, but she was sure this was what a Mr felt like. "M-Mr Plant, you have to st-st-st-oooooh...." Her wings, previously clasped against her sides in fear, now began to open up wide like umbrellas, pointing up stiffly in the air for all to see... if anypony else were around to do so.
Fluttershy's jaw worked silently a few times as she couldn't think of what to say in response to the pleasuring she was now receiving. It was clear that she couldn't allow it to continue, if only for her own dignity. She couldn't risk somepony coming along and seeing her like this! Giving up on her negotiation, she tugged her forehooves away from the plant. The vines pulled on her, but she was flesh and bone compared to pith and xylem, and even a petite pegasus such as herself could outmatch it.
At least, until the vines inside her vagina had their say. They had, by now, formed a grapestalk-like web all around the lining of her sex, and although she couldn't tell, some of those shoots had burrowed into the flesh of her sex and were now leisurely attaching themselves to the most enticing nerve endings that they could find.
Intelligent or not, the plant had tenacity, and thus it was only a matter of time before Fluttershy's clitoris was included into that burgeoning growth.
Fluttershy froze again, so stiffly that she might have been petrified. Her jaw locked, only her eyes communicating her state of mind by widening, and widening, and widening as plant tendrils spread into her most private, most sensitive area, filling her with a pleasure so intense that she couldn't even bring herself to scream. Saliva dribbled from the corners of her jaw, a deep, bitten-off moan escaping her.
Oh m-my goodness... this really isn't good... She made another bid for freedom, but the vines had found their way around her rigid wings now, and she could see, out of the corner of her eye, that they were winding themselves in between the flight feathers... her struggle was again cut short by a jolt of intense pleasure, this time coming from two of her erogenous zones at once, wings and vagina... and she loosed her last, emergency resort, a scream for help.
The breathy, throaty scream was so soft that even Mr Sawbeak couldn't quite make it out, barely twenty feet away. Fluttershy began to panic, realising that she was both unable to escape or get help, and this thing, whatever it was, wouldn't stop...
It hit her in her clitoris with pleasure again and her body quivered with orgasmic delight... Ohhhhh... this is s-so g-g-g-goooood... m-maybe it j-just wants to be friends? she wondered. It didn't seem to be hurting her after all. Although it had trapped her, it had done nothing but give her the greatest feeling she'd ever experienced in her life. M-m-maybe I just need to m-m-make friends with it.... But as her body spasmed with the delight of another orgasm (or whatever it was the plant was giving her down there... she really couldn't identify it and wasn't sure she cared at this point), she realised that she was being stupid. This thing was a plant, it had no concept of fr-fr-friendsh-ship... but then, why was it so intent on pleasuri- oh!
As she laid there in a blissful haze, slowly beginning to accept every joyous gift of pleasure, the plant continued worming its way into her body. It had already made quite a lot of progress from the bottom end, but now the pegasus had settled on a comfortable position (slumped forward on her front knees, wings flared out rigidly in the air), it began to become more invasive, finding and creating entryways into Fluttershy's skin and flesh.
None of this caused Fluttershy the slightest pain. The plant saw to that. It was, pure and simple, a pleasure plant, and Fluttershy's pleasure - or that of any creature, it wasn't a picky plant - was like the sweetest, most divine nectar. It wanted her, it wanted to keep her safe, and happy... as happy as she could possibly be, for as long as possible. It already had control of her entire sex and was giving her the most intense pleasuring she could imagine.
Fluttershy had given up trying to escape. She knew she couldn't. R-R-R-Rainb-b-bow D-Dash will s-s-save me... or Ap-Ap-Applejack... T-T-Twilight... The faces of her friends came to her mind, and she was so glad to see them... she threw herself into an imaginary cuddle with Rarity, or at least, imagined that she did. In actuality, she was now as stiff as a tree, and starting to resemble one too. Not that she cared... the Rarity in her mind's eye approved of her predicament, and even desired to join her, bending down so that all Fluttershy could see was the purple curls of her mane and tail as her tongue probed into Fluttershy's sex...
Four hours had passed, and nobody had yet missed her. The forest was as peaceful as ever, and Fluttershy had stopped making a sound. In fact, as far as the plant was concerned, she never needed to make a sound again, so it had spent the last hour sealing her lips closed. Fluttershy no longer cared, for she was in bliss. The pleasure in her sex had never stopped and she believed it never would at this point. Darkness fell around her, making her eyes of little use, so those slowly glued and sealed closed. By midnight, Fluttershy was a smooth, blank face among the plants. The plant that had captured her was stripping away all the things that made her what she was physically, for the only thing she now cared about was pleasure. Over the hours of darkness, her body shrank. Limbs were kept if they were useful for balance... otherwise, they shrank away into an increasingly plantlike body.
By sunrise, an ordinary-looking yellow plant stood next to the green one, connected to it by sturdy vines. It had a pink, manelike flowering head which looked like Fluttershy's trademark curls, but any trace of a pegasus was long gone.
And still, Fluttershy remained. She was blind, deaf, mute, and any tactile senses she retained tended to be drowned out by the neverending pleasure fed to her by the plant. She didn't notice, a day later, when Twilight and Rainbow Dash came by in search of her, disturbing Mr Sawbeak yet again... they certainly didn't notice her.
She didn't care. She was everything she wanted to be, now.