"Hey guys, I found her!" Spitfire gestured for the rest of the Wonderbolts to follow. They'd been called in to help with an emergency search party after Coco Pommel had gotten lost in the Everfree two days ago. Flying search patterns while trying to see through the dense canopy had been difficult, and they'd been on the verge of giving up, but it seemed luck was on their side today.

Spitfire, Rainbow Dash, Soarin and a few other Wonderbolts touched down in a small clearing.

Rainbow Dash put her hoof over her mouth with a look of great consternation. "Holy buck... Coco's been Pommeled."

Coco Pommel was held down by what appeared to be a mass of writhing vines. Her pupils were rolled back in her head, tongue sticking out with a look of incomparable pleasure, and the reason why was quickly apparent: she was getting an absolute anal plundering! The Wonderbolts couldn't help but stare in shock, and perhaps a little arousal, as they looked on at the sight before them. Coco's puffy, perfect ponut was stretched open wide by some smaller vines, while a larger vine was replaced with another, this one revealing her hungry, pulsing reddened insides for a moment. Her cunt winked and squirted as her ass was refilled, and her teats seeming to harden even further as a full body shudder went through her as she arched her back with a gasp.

Spitfire looked around at the mortified faces of her teammates, trying to push down her own blush. "Yeah, yeah... Quit your gawking and help me get her out of there! And don't make me demote you for bad puns Rainbow Crash..."

A look of fear crossed Coco's face. "N-No! DunStahp! Feelsh SHOOO GOOD!"

The Wonderbolts hesitated for a moment, Causing Spitfire to groan. "Come on guys, s-she's not in her right mind, we've got to get her out of there! ...a-and be careful with those vines." Spitfire pressed her tail tightly to her rear and splayed her ears back, hoping no one noticed the new damp spot on the ground.

The Wonderbolts jumped into action, each pulling on and disentangling one of the vines. It was tricky work: the vines were slippery, the slime making their skin feel warm but tingly and numb, like pins and needles

"Agh!" Rainbow cried out. "A little help here?" One of the vines had snuck its way behind her while she was busy wrangling a larger vine off Coco's ass, prodding tentatively at her own backdoor. Thunderlane, struggled, just managing to tie his vine around a small tree in time to grab the vine away from Rainbow.

More vines surrounded them at the edge of the clearing, but Coco was freed. Rainbow and Spitfire quickly grabbed her. "Retreat everyone, we've got her!" Spitfire shouted. They all took to the air, vines snapping at them and just barely missing their tails as they escaped.

...

Spitfire and Rainbow Dash arrived at Ponyville hospital and dropped off Coco Pommel; the rest of the Wonderbolts left for Cloudsdale, but they stayed to wait with Coco Pommel until Rarity could come pick her up.

The flight there hadn't been easy, Rainbow recalled: at first Coco had been whining and complaining, begging them to let her ass be stuffed, even just one more time. Then she'd devolved into sensual moans, as the very idea of having her ass stuffed again made her cum. This pattern had repeated a few times, and each time Coco's sensual moans made Rainbow's ass twitch in sympathy. The tingle from having her ass prodded by that vine had developed into a persistent itch and ache, like the early signs of poison ivy, even though it had faded from the rest of her body. Spitfire didn't seem to be faring any better, her blush deepening with each cycle, too embarrassed to look Rainbow in the eye...

Rarity and Nurse Redheart walked into the room, snapping Rainbow out of her daydream. Twilight Sparkle followed them, to Rainbow's surprise.

"Coco dear, I brought you a gift! Feel better soon; we're doing our best at the store but no one can replace you."

And with that and a hug, Rarity levitated a dildo out of her saddlebag, at which point Rainbow started to think she'd missed a memo. It was so large it made Rainbow Dash wonder how she'd fit it in there in the first place.

Coco's thighs clenched as her eyes looked off into the middle distance, silky insides roiling around with anxious longing. "Rngh... Thank you Rarity!" She took the dildo and after a moment of internal struggle, she plunged it in her ass in front of everyone, hidden only by the thin covers of the hospital bed, moaning, eyes rolling back as her tongue lolled out of her mouth. As embarrassed as she was, she couldn't possibly help but fuck herself vigorously on the thing: two days in those vines had left her hideously sensitive and completely addicted. Any residual shame was a pittance to pay for such all-encompassing pleasure.

Spitfire fixated on the scene from the corner of the hospital room, flushed and panting lightly, legs twitching antsily.

Rainbow shot the three mares a quizzical look. "Wait, shouldn't we be trying to cure Coco, not enable her?"

Nurse Redheart gave her a tired, apologetic look. "There's not much we can do I'm afraid; I'll ask Zecora if she has any potions for something like this, but even after removing the sensitizing compounds and seeds from her colon, it seems her neurons and endocrine system have been rewired. This is going to take years of therapy and magic treatments, if it gets better at all... And frankly, doctor patient confidentiality aside, I'm certain we all know she was into this stuff well before this little escapade, so it's doubtful she'd even want that. The best we can do for now is keep her... comfortable... and prevent her from spreading this around."

Now Rainbow was even more confused. "But I thought you already removed the stuff that did it?"

Twilight gestured to Coco and excitedly explained. "Based on Spitfire's description when you brought her in, it sounds like Coco was caught by a Passiflora Coprofilia vine. I found it in a book and read all about it before coming! Fascinating evolutionary history by the way: although it produces a flower capable of being pollinated, the stamens produce spores capable of germination independently, mixed into a gleba - which is convergent evolution with fungi by the way! Anyways plants love feces as a fertilizer - apparently this one evolved to get directly at the source. Its gleba is filled with chemicals which heighten sensitivity and elasticity to extreme levels, while also suppressing impulse control. The spores themselves have cnydocites which inject addictive chemicals, stimulants and neural modifiers into the colon wall, anchoring them so they're quite difficult to remove, and injecting more chemicals as they grow from feeding off nutrients from the digested - "

Rainbow facehoofed. "Twilight, what does any of that have to do with my question?"

Twilight's ears flicked back nervously and she put a hoof to her head. "Heh, Oops, you're right, I'll skip ahead. Anyways, unfortunately the spores also quite hardy: There's no known treatment that can harm the spores without also damaging the rectal tissue. But luckily, the spores mature into larger seeds, getting all the nutrients they need from their environment, and then they detach on their own when they're larger, which is why the best course of action is to just wait and let things run their course. And knowing Coco here, I think she'll quite enjoy the feeling of nigh endless, aphrodisiac lubed anal beads." Twilight shot Coco a knowing look.

Coco just blushed and looked away. "I-I'm not even going to try to deny thatHaaaHn!" She thrust herself down on the dildo faster at the thought; her plump, shapely rear all but cratering the poor hospital bed, somehow shorting out the heartbeat monitor.

Spitfire groaned. "Uh... S-Sorry everypony but I f-forgot I have some paperwork I have to complete back at the academy, ByegoodluckwithCoco!" And with that she zoomed out of the room.

"Hey wait!" Twilight shouted. Then she spun towards Dash. "Urgh... Send someone to check up on Spitfire to make sure she's ok."

Rainbow nodded and saluted with a hoof. "Consider it done."

"Anyways this is really serious Rainbow: I came all the way from diplomatic talks with the Yaks for this when I heard. It's been centuries since the last outbreak of these plants, and back then it ground Equestria's economy to a halt: we just barely avoided mass starvation because everypony was too busy having sex! And then a generation later there was a massive population bust because so many mares were addicted to anal and hardly bothered having normal sex anymore! I mean, minus Granny Smith... by the way, never ask her about that time" Twilight shuddered to recall those stories. While Granny had technically found a solution, it wasn't worth it. Never again.

"Anyways Coco is still contagious, but we'll keep her entertained for now and dispose of the seeds as they come out. We need to make absolutely sure that no one else is infected - we can't afford any leaks - and then we need to torch those plants. Can I trust you and the Wonderbolts to make sure of that?

"Y-Yes Mam!" Rainbow gave a salute and flew off.

Dash shivered: would a simple brush have been enough to infect her as well? She still felt a bit of an itch, but it seemed manageable. She supposed she'd bring it up if it got any worse.

Spitfire flew erratically towards her Cloudsdale home, ass clenching with a deep, obscene urge which pervaded all her thoughts. Before she had called the rest of the Wonderbolts over to help, the only reason she'd found Coco was because she'd been pulled under the treeline by one of those vines, and it had plunged itself all the way into the depths of here ass. For a few minutes, the world around her faded away and was replaced with all-encompassing bliss, vine wriggling around in her ass, coating her walls in silky, ultra concentrated aphrodisiac gel - unbeknownst to her, enough to last a normal pony a lifetime. Only her adrenaline and a herculean mental effort had allowed her to pull off the vine, and a not so small part of her whined and begged for her to give up and let it back in.

Thinking about the vines on the flight back to Ponyville made her shiver; the ravenous appetite for anal hadn't gotten any better since that time. She'd already snuck off once while they were waiting at the hospital to prod at her ass with her hoof, but much to her frustration, it had been too big to fit inside - not that it had mattered in the end. She was sensitive enough that a gentle prodding combined with imagining being captured by the vines again was enough to get her off, but it hadn't been much relief. She doubted she would have been able to keep quiet in the stalls if she'd been able to shove something up there anyway. And then watching Coco - She'd had to back into the corner to hide her winking and dripping... More. She needed more.

Spitfire opened her front door and flew up the stairs, briefly scrounging around under her bed to pull out her vibrator, and wasting no time, she plunged it in her ass - "Hnagh! Buck..." she briefly came again, shuddering on her bed and wetting the covers - but again, no relief. She started plunging it in and out, rubbing its exquisite texture on her newly sensitized colon - it felt better than using the thing in her pussy during estrus! With an unfocused, obsessed look, Spitfire kept going, vigorously rubbing her clit for more stimulation, ass denting the cloud floor. Was it just her, or did her ass seem a tad bigger and less muscled than this morning? She reasoned it must just be her imagination, warped by her new needs. She needed to nip this in the bud: surely she, a world-class Wonderbolt, could satisfy this hunger and get back to her daily routine. That vine hadn't really gotten her, right?

What Twilight had said still scared her though: she'd assumed this would all wear off in a while - but permanent?! Surely that was wrong. And even if it wasn't, Wonderbolt exercises were designed to train mind as well as body; with her mental toughness, she'd surely power through... She had to. Not like they had a cure at the hospital apparently. Hopefully Zecora pulled through though. Oh but she should have told them... Why didn't she? Spitfire squealed out loud, eyes rolling back in her head, plunging the vigorous vibrator as deep as it would go, and came again. A dark thought occurred to her: perhaps she didn't want this to end.

But Spitfire pushed that thought away as soon as it came. 'I'll deal with this... I can get used to this...' she thought. Spitfire huffed in frustration; this wasn't working. She needed more stimulation.

*Knock knock* "Spitfire, are you there?" Thunderlane's voice came from downstairs. "We've been looking all over for you - Rainbow thought you said you'd be at the Academy doing paperwork?"

Spitfire perked up: if her vibrator wasn't enough, surely a dick would do. Too bad she'd missed Twilight's warning. She sniffed herself; she reeked of a mare in the deepest throes of estrus. She blushed - no time to fix that - and straightened out her hair and trudged down the stairs. "Got it done already Thunderlane. I came back here to chill out a bit after flying all those search patterns."

She kept her distance, hoping he wouldn't notice the scent of her lust. She knew that wouldn't work forever though. "I gotta admit though; watching Coco Pommel got me all riled up: care for some fiery ass?" Spitfire thanked her lucky stars that this was an all too common sort of thing among the Wonderbolts. Common enough that Thunderlane probably wouldn't question it. Not like it was easy to find somepony sane to fuck or date when you're considered a superstar in most places, after all.

Thunderlane gave her a nervous look. "A-are you sure about that? Maybe we should get you checked out because Twilight mentio-"

Spitfire pounced and put a hoof over Thunderlane's muzzle before he could finish. "Don't worry about that; I'm right as rain. just interested in a little roleplay..." She said in the most seductive voice she could muster. In the back of her head a small voice cried out that she probably should get checked out, but she needed this.

Thunderlane's dick slapped to full attention after a few more seconds staring Spitfire in the eyes. "Uh, ok: if you say so ma'am!"

Spitfire flipped him over and plunged his dick in her ass, pinning him to the ground as she rode him like a toy, her ass still athletic but not without a shapely layer of fat to absorb the impact and ensure Thunderlane's pelvis wasn't crushed. An idea popped into her head and a sly grin formed on her face. "Thanks mister for saving me from those awful vines! Too bad they already B-bucked me up: I'm gonna need your help to keep distracted while these seeds come out. I'll probably still end up going back to the vines though... I guess you'll just have to convince me your dick is better!"

Thunderlane's dick twitched at the challenge, flaring and scraping her sensitive walls oh so nicely as she clenched around him. A tingling sensation passed through his cock as the spores infected him; it quickly went away but was replaced with increased sensitivity and libido, causing him to struggle not to cum right then and there. He grabbed her ass cheeks, toned but supple with just a delicious amount of give, thrusting up to meet her hips, the enticing scent of her arousal growing stronger... Nope, he wasn't going to last like this. Thinking quickly, Thunderlane ran over to a cupboard and opened a drawer, shuffling about.

"Hey what gives?!" Spitfire felt like a vital organ had been removed from her, quickly shoving a hoof back there in a vain attempt to replace it, stoking her clit to try and match the level of stimulation, but it just wasn't the same. Caught somewhere between sharp denial and withdrawal, she shivered and sweated.

"Do you still keep it here? Ah ha!" Thunderlane shouted as he pulled out a large string of anal beads, turning to face Spitfire again with a devious grin. "Sorry, it looks like I didn't make it in time: It doesn't matter what I do, does it? You, my cute little slut, will run right back to those vines the first chance you get, won't you?"

Spitfire Shivered at his words; 'D-does he know?' she thought, doing her best to mask her surprise with her lust as he loaded up the anal beads. It wasn't difficult: it was as if the vine's secretions had sculpted her ass perfectly for laying seeds - the smoothness and roundness, like gentle ribbing as she clenched around the beads already in her tunnel, trying to feel the delicious friction against their smooth surfaces while also trying to keep her eyes from rolling back in unnatural ecstasy.

He continued, squeezing in the last few. "Probably doesn't even sound like a bad thing to you anymore - I bet it's Soooo enticing... Oh look, here comes the first seed now!" He pulled on the anal beads, the largest one stretching her elastic ass deliciously as it fought the exit.

Spitfire didn't want to admit it to herself, but the smoothness and perfect shape of the anal beads felt even better to her than when she'd spitted herself on Thunderlane's cock earlier; almost as good as the vines. It was driving her mad.

As the first bead popped out, Thunderlane flipped her into missionary position and spread her pussy with his almost painfully hard cock, still pulling the anal beads out slowly with his tail. The increased stimulation was the last straw for Spitfire: she came harder than ever before in her life, clenching so hard Thunderlane had to stop moving. He came a moment later as well, dousing her womb with his seed. They both panted and groaned as their sweat and juices darkened the cloud floor around them with their moisture, then slumped to the floor, exhausted by the magnitude of their shared orgasm.

Thunderlane noticed something odd: usually he'd soften for a while before being able to go again - but he was still perfectly hard! He gave an experimental thrust - it felt perhaps even better than before!

Spitfire's eyes crossed and some hairs popped out of place on her mane. "Hnaaah!" Apparently Spitfire was still feeling it as well. And they still had more anal beads to pull out, so he kept going.

A few hours later, they'd finally tired each other out and collapsed on the floor.

“Aaaahh… That was great. I had no idea you were so into anal.” Thunderlane moved to hold Spitfire’s hooves in his own, but she swatted them away. “Hoof holding? Jeez… Keep it professional, Thunderlane.” She admonished. The irony was lost on her, still trying to piece herself back together after that last, earthshattering orgasm.

Thankfully, she found that the need had subsided a little. She still craved another round, but figured Thunderlane, as dense as he could be, would start to suspect something if she asked for that. Plus, she'd at least physically tired herself out.

“Anyways, Spitfire, we'd better head back for the planning meeting soon" Thunderlane scratched his head.

"What planning meeting?" Spitfire cocked an eyebrow at him.

"Oh Twilight tasked us with burning down those vines in the Everfree, so that other ponies don't get big ideas and go there."

Spitfire screamed internally: her chances of anal vine sex were in jeapordy! A plan began forming in her head. "S-sounds like an important meeting: let's get over there now. Er - maybe after a shower..."

The following morning, Thunderlane awoke groggy, slowly blinking the sleep out of his eyes. He stepped out of bed as normal, and went to the bathroom to brush his teeth. That's when he noticed it in the mirror... Morning wood wasn't unusual for him, but...

"AAAH! My dick is green!"

Author's Note

Inspired by 2766919 and 2825177 on Derpibooru.

Anal hungry tentacles X Coco Pommel is clearly the superior ship dynamic.

Also learn from Thunderlane: always use a condom and clean up properly afterwards. Remember kids: if you're not part of the solution, you're part of the precipitate. Oh no wait that's chemistry.