“And you think this might explain where Rainbow Dash and Rarity have disappeared to?”

“Well… no… I mean potentially… I’m not certain if the two events are causally related. Well… I can’t deny the possibility at least,” Twilight opened the creaky metal door and allowed a very worried looking Sunset Shimmer to enter her own private lab.

The ‘facility’ was demonstrably inferior to the one that had been offered to her by the school administration during her time at Crystal Prep but Twilight had found the converted janitor’s closet at Canterlot High to be growing on her. It may be a lot more claustrophobic than the old lab but the whole of Crystal Prep had felt claustrophobic to her so she had no serious complaints.

“What…is all this?” Sunset murmured, staring at the walls of Twilight’s ‘lab’. The shelves on the walls were adorned with jar after jar. Old, cleaned out peanut butter jars, jam jars of all sizes, some pickle jars she’d gotten from home. 137 jars of ‘samples’ to be exact.

“This is what I was trying to tell you about. Look!” squeaked the excitable purple teen, holding up what looked like an empty jar right under Sunset’s scrunched up nose.

“A jar…?”

It took Sunset a moment to notice the jar’s inhabitant. A tiny black smear on the glass… no… a… worm?

“What… is it?” she asked.

“Absolutely. Fascinating!” proclaimed Twilight, grinning broadly, “It’s a completely unidentified species of parasite! Never before seen in our town or in the world at all! An amazing creature with amazing abilities! They interact and interface with their host at a neurological level, locking themselves into the brain and forcing a symbiotic relationship that…”
Sunset would usually be keen on helping Twilight with any of her new discoveries but Rarity and Rainbow Dash had disappeared off the face of the earth nearly 48 hours ago and she wasn’t keen on wasting time letting science babble wash over her.

“Twilight…” she said, trying to sound patient but ending up sounding strained.

“I believe that they are… not of our earth!”

“Wait… what did you say?”

“Perhaps… visitors from Equestria? It’s not uncommon for parasites or other organisms to accompany visitors from a distant land. Rats, pigeons, cockroaches, tapeworms and any number of other gut fauna all accompanied early settlers to the New World and in a similar way I believe these creatures may have, at some point during their life cycle, have accompanied one or more of our visitors from Equestria,” if Twilight was a dog she would have been wagging her tail hard enough to whack some of the jars off their shelves.

“I mean… I lived in Equestria all my life and I don’t recognise these things… not that I spent too much time looking at… gross black worms…” murmured Sunset, shifting uncomfortably as she stared down at the worm trapped in the jar. Its eyeless head lifted to greet her, reaching out and touching the glass, “Why do you think they’re from Equestria?”

“They are simply overflowing with magical energy! And they behave completely differently from an organism on earth! I’m telling you these are organisms with the ability to do simply impossible things! At least impossible by our world’s standards,” Twilight blurted out, struggling to contain her excitement and to treat the occurrence with all due seriousness.

“Do… do you think there might be a second portal to Equestria? That could explain where Rarity and Rainbow Dash have disappeared to!” Sunset looked very frazzled. The disappearance of her friends had hit her harder than it had hit this relative new comer to their group, “I should contact Twilight… er… other Twilight… about this. Maybe she’ll know something about these… things…”

The black worm was pressing hard against the glass of the jar that it was trapped in, hungrily reaching out for Sunset. The sight was enough to send chills up Sunset’s spine.

“I’m sure she will have heard of them. They may be rare in your world but they’d be hard to ignore. They’re essentially a type of parasite that feeds off endorphins released in the brain! Upon gaining access to a host’s brain they stimulate the production of said endorphins to feed their own growth. I found several controlling the brains of some of the pet dogs in the local neighbourhood… hehe… hence why I sent Spike to stay with Fluttershy… Not that I would ever allow anything to go wrong but I felt their presence might disturb him a little. I’m still unsure of what animals they can and cannot turn into hosts but suffice to say another few experiments should easily… oh…” Twilight had been babbling along happily to Sunset, completely failing to notice that the fiery haired teen had already rushed out to go try and contact her otherworldly counterpart.

“Not that I’m not worried about our friends too,” added Twilight defensively, adjusting her glasses, and continuing to converse with no-one but herself, “But these creatures are simply fascinating. I must ask the other Twilight to try and bring more of the local fauna and flora across for study!”

She raised the jar and placed it alongside the others on one of the many shelves. Each jar contained a worm, squirming and wriggling against the glass quietly. Some she had extracted from their entrenched position in the brains of local pets, others she had found squirming their wormy way along the ground. They must be multiplying at an amazing rate, she thought to herself, or maybe Sunset is right and there is some kind of portal to Equestria that they’re coming out of constantly. She rose to follow Sunset out of the janitor’s closet/impromptu laboratory when something caught her eye. A faint glimmer of light.

“What was that?” she murmured to herself, turning back to her innumerable specimens.

Another glimmer. Like fireworks viewed from a great distance. A momentary flash. Some sparking plug fixture? In order to better identify the source of the flicker Twilight switched off the dim bulb that lit the janitor’s closet and stood, completely still, eyes wide open in the gloom. There it was again. A distinct flicker of light. Slowly she moved towards it.

“Bioluminescence…” she breathed. Like a dying sparkler one of the tiny worms she’d trapped in a jar that had once held pickled olives was letting off a dim, intermittent illumination.

“Fascinating… they can use their bodies to give off some kind of light… I wonder if it’s some kind of mating ritual… or maybe they were originally cave dwelling creatures!”

Suddenly another glimmer caught her attention out of the corner of her eye. Then another. Standing there in the dark of the Canterlot High janitor’s closet her jaw nearly hit the floor as flicker after flicker blinked out of the many jars of specimens she had captured. Winking out tiny bursts of white light.

“It’s so beautiful… I should really catch this on film… or something…”

The blinking and flickering was initially chaotic. Occasional flashes of light but the longer she watched the more the curious organisms seemed to organize themselves. They began, slowly at first but more with each passing second, to flash their tiny lights in unison.

“It must have to do with mating… they’re all releasing their luminescence at once… converging their light releases in some kind of pattern… I wonder what meaning it holds…”
Twilight felt like she was drifting in a dream, standing in the dark and watching the worms flicker their strange lights. Floaty… dizzy… strange… Had she been remembering to eat properly? Without Spike to remind her sometimes she would get so distracted by her work that she’d forget the most basic things. She should really write down what she’d seen here or record an audio log. Yet, her arms hung by her side… motionless.

The parasites were releasing their flash of light in perfect throbbing unison now. One blink every second. While individually they did not release much light altogether their bioluminescent burst was blinding. A bright white flash that filled the dark room. Then darkness. Flash. Dark. Flash. Dark. On and on.

How long had Twilight been standing here? Her mouth agape.
“I should… I should really… just save this for later… Sunset needs my help. I…” the voice sounded like it belonged to someone else. Coming at her from a distant tunnel. Echoey and alien. Her head was throbbing… not like she had a headache. More like her brain itself was beating like her heart was. Beating to the rhythm of these curious flashing creatures.
The flickering pattern they had fallen into intensified, fluttering along with the increasing pace of Twilight’s heart. Thump, thump, flash, flash. Her lips were numb, fingertips tingling in a manner most curious. Blood rushing to her head, a gentle flush playing on her cheeks.

“I really… I rr… I rrruh… nn… nnuh…” she mumbled, fumbling over words. The thoughts were there but difficult to pin down, slithering out of her grasp and away like greased up snakes. She exhaled slowly through her nose, hissing her breath out into the silent air. Had she been holding her breath this whole time? How long had she been watching this display?

A string of drool slid lazily off her hanging bottom lip, gliding down to land on the small swell of her pert b-cup breasts, tracing a darker blue trail down her sky blue button up shirt. Her shoulders rising and falling with her breathing. So slow. As one deep in sleep breathes. Swelling and falling. In and out. The flickering was so fast now it became impossible to tell the dark from the light. A constant blurry glimmer. Twilight’s heart thundering in her ears. Like the sound of her consciousness pounding on the door of her mind, desperate to get in, echoing from down a long dark hallway.

Then suddenly. Violently. She was plunged into darkness. The flickering ceasing entirely. The shock of it was like being punched directly in the brain. Everything was dark. She was nothing. A blob of nothing floating in the janitor’s closet of Canterlot High.

Flash.

A sudden burst of light. Her mind flooded with images. Dogs stumbling around, their minds infested with the invasive parasite. Eyes vacant. The fear she had seen on Spike’s face as he saw them. Fear of being… used in that way. She hadn’t been afraid. Scientific curiosity. The way the worms squirmed as she held them in the forceps of her tweezers. Reaching for her. They were still reaching for her. Through the darkness. She felt a stirring deep in her gut. But it was not disgust. She was too numb in mind and body for that. Something else. Something deeper.

Flash. Flash.

Two bursts. More images. Like her head had burst out of the all-consuming ocean of darkness for a breath of air before plunging back down. They feed on pleasure. Enter the brain. Control the host. Seek more. The greatest pleasure. Humans, bonobos and dolphins are the only members of the animal kingdom to recreationally pursue sex. The aching… the stirring down below. A tug. Like the moon’s pull on the ocean. So subtle. So quiet. So deep. But a pull that could not be fought. A yearning to… to be… to…

Flash. Flash. Flash.

To be rutted. Dogs hammer their stiff knots into the females, pinning them and staying inside them, locked together for upwards of half an hour. The stirring down below grew more distinct. A sharper tug. A deeper clench. Boars have a multi stage ejaculation that can last from 10 to 30 minutes. Pinning their mate, they wriggle their swirly equipment deep and unleash a foul torrent of seed. 4 decilitres on average, almost half a litre. Larger boars can spurt a litre or more. Enough to swell a tiny human womb. Sealing it shut when they’re done with a thick gel. Keeping the warm fluid inside. Guaranteeing pregnancy. But she wasn’t… a sow… a bitch… sweating on her hands and knees, powerful bodies bucking their way into her depths… she wasn’t a…

Flash. Flash. Flash. Flash.

Sow. Bitch. Whore. Slut. Sow. Bitch. Whore. Slut. Twilight didn’t look at dirty things. Sow. Bitch. Whore. Slut. Sow. Bitch. Whore. Slut. She was a good girl. Sow. Bitch. Whore. Slut. Sow. Bitch. Whore. Slut. She kept herself under control. Sow. Bitch. Whore. Slut. Sow. Bitch. Whore. Slut. Barely ever rubbed down there. Sow. Bitch. Whore. Slut. Sow. Bitch. Whore. Slut. So why were things starting to ache down there so badly? Sow. Bitch. Whore. Slut. Sow. Bitch. Whore. Slut. Why were the words resounding so clearly in her head? Sow. Bitch. Whore. Slut. Sow. Bitch. Whore. Slut. Why were her thighs trembling and clenching together? Sow. Bitch. Whore. Slut. Sow. Bitch. Whore. Slut.

Breathing heavily, puffing like she’d been on a long distance run. The trail of drool on her shirt had vanished as the sweat beading on her skin had drenched the whole garment. Was that sweat forming down there too? Why was it so sticky? Viscous? Why did her nethers throb so badly as it oozed out of her?

Flash.

Her right foot shuffled forward. Just an inch. As if she had been nudged from behind. Had she done that? Maybe just to readjust her balance. She felt like she’d been standing here forever. Maybe just another step. Another inch. Her hips eased her weight from one foot to the other, allowing her left leg to swing awkwardly, like someone walking on stilts, through in front of her. She was so shaky. She felt like she’d woken up from being anaesthetized. Like she was walking for the first time. Where was she going? Another step. In the dark. She knew the room though. She’d been here a while, working on her experiments. She liked the way… her crotch squelched a little as she stepped. Little rivers of sweat and… other fluids freely running down her smooth, lavender thighs. Her tunnel grinding against itself as her body shifted. Her hand was lifting. All on its own. No… surely she was doing it? What was she doing? Something about her experiments? Something about… breeding? She needed to… she wanted to…

It was simple, wasn’t it? All organisms need to breed. To be bred. It’s a female’s duty to her species. To let any and all males rut her. Hammer her. Spurt gallons of thick creamy seed into her. Squeezing her neck tightly as they drove into her hot, delicious depths, their dicks banging on her womb like battering rams, thumping in time with the throbbing down there. She needed to… oh…

Her hands clamped to her chest, hips thrusting forward clumsily, shaking back and forth as a wave of sensation washed upwards, burning through her lower body like fire. She was cumming. In the dark of the janitor’s closet. Cumming hard. Her mind flooding with thoughts of sex. Thoughts of breeding. With humans. With animals. Grabbing her… pinning her… spearing their meaty pillars into her hot, warm, slimy depths. Driving deep with no regard for her enjoyment or even safety. Piledriving her little teen body. Squirting gallons of steaming hot creamy goo into her. Tiny swimmers swarming her vulnerable eggs. Impregnating her. Her thighs quivered. Mouth agape like a fish dragged up on dry land, fingers grasping helplessly at the air like a baby. She wanted to sink to her knees but her body would not allow her. All it allowed was a gentle thrusting at the air as her body convulsed. Distantly she could hear her honey spattering on the cold hard floor. Hear her throat making a strangled noise. Her mind flooding with endorphins. Her brains must taste delicious right now. So sweet. Did she just think that? Think about… what she had seen… The infected female dogs had been driven to breed almost ceaselessly, their forced endorphin release locking them in permanent heat. Some of them had started to stink from all the musky cum pumped into them by the time Twilight had found them. Waves of orgasm hammered into her little clenching womb, its mouth suckling hungrily at a non-existent cock, eager to be used for its desired purpose.
Flash.

And all the complex thoughts were gone. She needed more. Her hand reached shakily out, finding a dusty jam jar. With all her might she flung it backwards. It sailed through the dark air and smashed on the far wall. More. Break more. Break all. She flailed her arms, tearing jar after jar off the wall and smashing them on the ground. Swinging them over her head, hurling them to the ground. There wasn’t enough time to unscrew them. Break the glass. Break the glass. Get more. Fulfil purpose. Break. A crescendo of shattering glass filled the silence. Crashing and tinkling as each and every container was opened. Finally a wave of relief flooded her. It was done. All broken.

“Ah…” she said. And as if that were the sound of the flood gates breaking her mind rushed back into her, “What… what was that? What on earth am I doing?” she sputtered.
She’d broken every one of her containment jars. Freed all of her experimental subjects. Had she really allowed all those foul thoughts to enter into her head? Had she really…
Twilight squeaked with embarrassment. She was still soaking wet down there.

“G-g-goodness.. I… Well… I always leave a change of clothes in my lab in case one of my experiments… ruins my clothes… there should be one in the draw…” she mumbled, glad that no-one had borne witness to her bodies lewd display. And yet she didn’t move at all. Standing stock still.

“Hypnotism. I should have known that they would have some kind of a defensive mechanism. They are so vulnerable in their larval state. I thought maybe they exclusively preyed on sleeping victims but maybe that was more opportunistic than anything else. Who knew they could interact with something as complex as a human on a neurological level at a distance…?” she paused, still flushed with embarrassment, the throbbing between her legs easing off as her reasoning faculties returned, “Still… they certainly used my… baser instincts against me… I suppose to them endorphins are endorphins after all… maybe that’s just the most effective way to produce them. Quite an impressive escape attempt. Oh, my gosh! Why am I just standing here babbling? I should hurry up and recapture them immediately!”

And yet she didn’t move at all. Like a statue… with soaking wet legs.

“This is… unusual… Some kind of hypnotic paralysis? No doubt so that they can make some headway in escaping me? Maybe find more animals to inhabit? Very clever…”
Something touched her leg. Something small. A gentle experimental tap from a soft and slimy body.

“Oh… oh no… no… no…”
If they can hypnotize a human why would they be unable to… inhabit one? Twilight may have assumed that human brains were simply too complex for them to control but maybe… she had been wrong. Maybe the dogs were merely scout vessels being used… to hunt down a more effective endorphin farm… a larger breeding facility. Humans had the largest brains of any animals in the nearby area. The tendril was inching its way up her leg, gluing itself to her skin, dragging its weight up her slick leg.

“Help! Help! Someone help!” she cried. But it was well after hours. Most if not all the other students had gone home. Sunset was no doubt off to try and contact her other self, “Heeeeelp!” She was alone. Except she wasn’t. The worm gripped onto the hem of her skirt, heaving its tiny self ever upwards.

Well… at the very least she would be quickly rescued. Sunset would figure out, just as she had, an effective method of extracting the worm from her brain. Though… the thought of it filled her with dread. The dogs she had saved had all returned to normal functioning. She should be fine… everything would be fine…
Another worm tapped on her leg. She could feel another one bumbling its way up over the heel of her shoe. Another twisting and turning as it clambered over her sock. She could hear broken glass clinking as more than a hundred tiny bodies wriggled their way closer to her.

“No… they couldn’t… possibly all… inhabit just one brain… that’s… that’s not… that would destroy the host forever… permanent brain damage… there are 137 specimens in here…” her mind reeled violently, “There are 137 subjects… at 0.3 ounces per subject… approximately 48 ounces of worms… that’s 1.3 kilograms… that’s… the same weight as a human brain… If they all enter my brain… my brain will be completely… destroyed…”

They had gathered below. A black tide in the darkness, slithering inch by inch, flowing over her shoes, squirming up her legs like a pair of disgusting black stockings.
“Help! Help! Heeeeelp! Sunset! Spike! Anyone!” the highest climber was easing its way up the slope of her breast. Its eyeless head teasing her nipple as it hoisted itself up.

“P-p-please… I’ll die… you’ll destroy me… that’s not what you want, is it? To kill the host? C-c-can’t we just… do one? You need me alive to feed off of me… don’t you?” she mewled pathetically, trying to negotiate with the brain devouring monsters, “Help! Heeeeeelp!”
Her voice sounded strained and hoarse. A tiny black worm touched her neck. The squirming, writhing sea of them below had climbed to her hips. Urged onwards by a single purpose. To swallow her whole. To devour not her very essence.

Her hot, sticky little teen cunny continued to ache despite the terror. Throbbing in the wake of her orgasm. Eager for more.

Twilight had stopped screaming and clamped her mouth shut as tightly as she could manage. Something foul was pressing against her pursed lips. Her research had shown that when swallowed they quickly found passage to the brain by extending their tendrils through the central nervous system. More than capable of setting up colonies in the intestines after the brain had been brought under control. But it wasn’t their preferred locale… They preferred to nest directly in the brain itself.

Twilight’s eyes were moist. Her vision blurred. She should have seen this coming. She was going to be eaten. In this dark room. Turned into a vehicle for a lower creature. More of them were caressing her slender neck as they climbed, unperturbed by her gulping and gagging. The front runner had abandoned its attempt to pass her lips and begun crawling higher. The nostril. She had seen abrasions inside the nostrils of infected pets. They could tunnel in through their, diving directly into the brain.

It glided into her nostril as smoothly as an express train entering a tunnel. A perfect fit. Twilight went cross eyed for a second. Human beings are 70% water but one never truly gets and appreciation for that fact until one is drenched in sweat, crying, nose watering and pussy weeping out its desperate need to get stuffed full to the brim.

Other worms had started to reach the summit of Mt Twilight. Stuffing themselves into her nostrils. One by one at first but soon they were piling in, wriggling and writhing. Stretching the two tiny holes to capacity, forcing themselves in. There were so, so many.

Twilight’s hypnotically paralyzed fingers twitched ever so slightly. Her arms clamped stiffly to her sides.

“Ngghhnggggg…”

The next wave of slimy black brain invaders arrived to find her nostrils already overcrowded. They turned their featureless blank faces to her other holes. Her whole body shivered, despite being as rigid as a shop mannequin, when the first one nudged the entrance of her ear. Kissing the round flesh of her lobe as it felt its way around. Then with renewed purpose it heaved itself inside.

When the first one touched her brain she came again. The hypnosis had prepared the breeding ground of her brainflesh well for the coming occupation. Softening it up, soaking it with endorphins, sex addling it such that even a single tendril was enough to drive her over the edge. Her eyes rolled back in her head as her brain fired pleasure signals down to her virgin pussy. Urging it to rejoice. They would be forcing her to breed soon. To fuck. To be fucked. It was going to be her new purpose. As a farm for pleasure. This might be her last experience of pleasure while she still had the cognitive capability to appreciate its meaning.

It was as if her brain and her cunt were linked. As the worm curled its body into her frontal cortex it was as if someone was curling a finger into her g-spot with shocking accuracy. Her hips, still frozen from the powerful hypnotic grasp, began to lift and drop her body, heaving against themselves. It took them longer to tunnel into the brain from the nostrils. The worms entering her ears were already wriggling against her soft pink brain flesh and by extension tickling the walls of her pussy. She could hardly tell where one orgasm ceased and another began. 6 of them were inside already. Grinding against each fold and crease they encountered, bumping the inside of the wall of her skull. Her arms jerked and lurched inward to her chest. Twitching and pawing at the air like a dog having its tummy rubbed, kicking away involuntarily at the air.

The traffic jam of worms in her nasal cavity finally cleared, oozing into her brain like a tightly squeezed tube of toothpaste, vomiting squirming black worms into her depths. Her jaw clenched tightly, eyes glazed and cross eyed.

Her head felt so full. Not of ideas. All her ideas were draining away. Full of squirming. Full of writhing and wriggling. The black beard of worms was vanishing off her face, pouring into her orifices. Her neat, clean clothes, pleated skirt, sky blue shirt were all stained. As if she had been rolling through a blackberry bush. Dark streaks marked the passage that each worm had taken up her body. Her knee socks were stained with something else entirely. Girl squirt. Proof that she really was going to be a good little breeder.

Her mouth hung open but there were no longer any worms left to take advantage of it. The last few black blobs vanished into her ears and nostrils. Her head packed achingly full. Full to the bring. As the worms got comfortable they cleared room for themselves. Annihilating everything in their way. Childhood memories, ambitions, intellect, emotion. All wiped clean with a squirm of a worms body and a throb of her cunt.

Her face relaxed at last. Flushed warm. Looking like a lobotomized retard enjoying a bath.
Blisful.
Empty.
Relaxation.
Pleasure.

They would take her for a walk soon. Take her out to find someone to use her. But for now they would get comfortable, digging in deep, entrenching themselves inside her. Relaxing in the darkness.