Rainbow Dash and the Tentacles from Another Dimension

by HoofBitingActionOverload

Rating: mature
Tags: Rainbow Dash, Sex, Random, Twilight Sparkle, Dark
Length: 6452

Twilight is tired of Rainbow Dash's constant pranks, so she comes up with a prank of her own to get even. It involves interdimensional monsters, a whole lot of coitus, and even more tentacles! Rainbow Dash won't know what hit her.

Twilight is tired of Rainbow Dash's constant pranks, so she comes up with a prank of her own to get even. It involves interdimensional monsters, a whole lot of coitus, and even more tentacles!

Rainbow Dash won't know what hit her.

Trigger warning: Tentacle rape

Published 2014-11-21 20:00:04 UTC
Last updated 2014-11-21 20:00:04 UTC

Tentacles, Tentacles, Tentacles

The sticky something slipping down Twilight’s forehead and into her eyes was probably ketchup, but who could really know. The slightly stickier something burning her nose and falling into her mouth was mustard, or so she assumed. The cold, creamy, runny something in her ear was almost certainly mayonnaise. The prickly crumbs on her face were crushed taco shells, and the slippery lumps dripping from her chin were, she hoped, what was left of the tomato and pepper salsa. She could only guess what the something in her mane was. Guacamole, maybe. Or hummus. If she was really lucky, it would turn out to be glue.

The book sitting on the balcony floor before her hooves was the only surviving original copy of the Sylph Psalter, an unfathomably important text for understanding the prosody of Pre-Discordian Era unicorn poetry. Twilight had only been able to remove it from the Canterlot Library Archives after invoking her right as Princess. Even then the librarian had argued with her for over an hour before allowing her to leave with it, and then only after Twilight took a solemn vow that she would sacrifice her own life rather than allow the priceless text to come to harm. Or at least it had been priceless up until about a minute beforehand, when a balloon filled to bursting with ketchup and mustard and mayonnaise and salsa and, if she was really lucky, glue had dropped onto Twilight’s horn from above and split and spilled all over her and the book. The condiment cocktail had almost certainly already seeped through every page by now. It was beyond repair.

The pegasus rolling around the balcony floor, laughing hysterically—that was Rainbow Dash. Barbarian. Hell spawn. Horror of libraries everywhere.

As a dollop of mayonnaise slipped out of her ear and rolled down her neck, Twilight considered what the absolute worst, most agonizing manner in which she could bring Rainbow Dash’s life to a sudden and deserved end would be. An evisceration spell, perhaps. It would be the equivalent of dropping the pegasus in a blender, but with less blender and more unbridled hatred. Or Twilight could teleport her to Tartarus. It would be months until anypony even thought to look for Rainbow Dash there, and years until anyone actually found her, if ever.

But why get weird with it? Twilight could always simply explode her heart. Cardial oxidization spells were the ancient Eranshahr Empire’s preferred method of execution for hundreds of years. And the Eranshahr Empire executed a lot of ponies. If anypony had ever known how best to mix efficiency and murder, it had been them.

Instead of doing any of that, though, Twilight took a long, mustard-filled breath through her nose, and said, “Why?”

Rainbow Dash laughed some more at that. “It’s a prank, duh.”

“Do you have any idea how incalculably valuable this book is?”

“Jeez, Twilight,” Dash said, hopping up onto her hooves. “That’s what you say about all the books I mess up. Chill out.”

“This time, I mean it.”

Rainbow Dash trotted up to Twilight and patted her on the nose. “It’s a prank. It’s funny. Learn how to take a joke already.”

Somewhere far overhead, a pigeon twisted inside out and burst into flames. It was only thanks to a last second change in spell direction by Twilight that the same didn’t happen to Dash’s head.

“It wasn’t funny,” Twilight said through gritted teeth.

Dash shrugged. “Just because you don’t get it doesn’t mean it isn’t funny.”

“Rainbow Dash,” Twilight said, with a glare that a pony could have fried an egg on, if ponies ate fried eggs. But they didn’t. “I am sick of your pranks. They aren’t funny. They aren’t clever. Every time, it just ends with a mess I have to clean up.”

“Actually, most ponies think I’m pretty funny.”

“How would you like it if I came over to your house every other day and did things like this to you?”

“I would laugh,” Rainbow Dash said. “Because it would be funny. But that would never happen, because there’s no way you could ever prank me. You can’t outprank Ponyville’s top prankster.”

“Go away.”

Dash rolled her eyes. “Calm down. I’ll go get you a raincloud. Wash you right up.”

 “Don’t bother,” Twilight said, turning around and walking inside, her hooves squishing with condiments every step. “I’ll take a bath.”

Twilight slammed the door shut behind her.

Rainbow Dash shrugged and flew off.

But Twilight didn’t take a bath. Instead, she went to her library and read all the books she could find on the subject of pranking. Then she read all the books she could find on the subject of summoning beings from other dimensions.

Rainbow Dash would never know what hit her.

 And it was Twilight’s lucky day, because the something in her mane turned out to be glue.

_________________________________________________

“Hey, Rainbow Dash!”

Rainbow Dash stretched and yawned and rolled over on her cloud and peeked over the side. She saw Twilight standing down on the ground beneath her.

“Hey, Twilight.”

“Could you come down here for a minute?”

Rainbow Dash yawned again and hopped off the cloud and landed on the ground. “What’s up?” she asked, rubbing at her eyes.

Twilight grinned and said, “I’m here to prank you.”

“Uh, I don’t think you know how pranks work.”

“I assure you that I do,” Twilight said, still smiling. “I know a key element of a successful prank is the factor of surprised involved, and that surprise is most typically achieved by carrying out the prank suddenly or by catching the receiver of the prank off guard, but in this case, I think you’ll find that the contents of the prank itself are surprising enough on their own that no supplementary surprise will be necessary.”

“Whatever,” Dash said, looking around. She didn’t see anything out of the ordinary, just a regular Ponyville street. No other ponies nearby, either, unless they were hidden. “So what’s the prank?”

“Oh, it’s not here. It’s at the library.”

“Twilight, I really don’t think you know how this is supposed to work.”

“Well, what do I know?” Twilight said pleasantly, no hint of sarcasm in her voice. “You’re Ponyville’s top prankster. I’m just old bookish Twilight the egg head. Regardless, I have something for you in the library, and I think you’re going to like it, and it’s probably the most innovative prank you’ve ever seen.”

Rainbow Dash chuckled at Twilight’s naivete. There was no way some novice prankster could ever think up a prank that she hadn’t already perfected. But she thought it would be best to humor her friend. Twilight had some serious self-esteem issues. Most of Dash’s friends did. Probably as a result of being around such a talented, awesome, sexy pony as herself all the time. How could they ever hope to match up?

They couldn’t, obviously, but that didn’t mean Dash shouldn’t help them feel better about themselves. It’s what a good friend would do, and if Rainbow Dash was anything, it was a good friend. And also a fantastic stunt flyer, snazzy dresser, exquisite dancer, and—or so she had often been told—a pretty damn good kisser.

Because Rainbow Dash wasn’t just a good friend, but the absolute best sort of friend, she said, “Sure thing. Lead the way.”

Twilight smiled and lead the way to the library.

__________________________________________________

When they reached the library, Twilight showed Rainbow Dash to the basement door. Twilight opened the door, paused, took a deep breath, and said, “I just want to make sure you know, before everything else begins, that this is for the Sylph Psalter.”

“Whatever.”

They crossed over the threshold and walked down the stairs together.

In the basement, Rainbow Dash saw a large pile of spaghetti. Well, really more like a small hill or exceptionally big laundry pile of spaghetti, maybe about five to tens times Rainbow Dash’s size, but that wasn’t important. What was important was that the noodles were every color of the rainbow, some red, orange, or yellow, others green, blue, or purple. Actually, Dash noticed, the spaghetti’s colors perfectly matched the colors in her mane. Also, the noodles were of every possible size. Some were impossibly thin, others thicker than Dash’s head, and every length and width in between. Hundreds, thousands, millions of colorful noodles sat in a great mass on the basement floor. But none of that was important, either. What was really important was that the spaghetti was moving.

Each and every noodle and strand was in constant motion. They wriggled, slithered, squirmed, convulsed, and rose up into the air and twisted and curled and tangled.

“So, uh,” Rainbow Dash said, reaching the bottom of the stairs, “your prank is feeding me a delicious, congratulatory, magical spaghetti dinner as an apology for being so uptight all the time? Sweet, and apology accepted.”

“That’s not spaghetti,” Twilight said.

“What is it then? Linguine?”

“That’s you,” Twilight said, pointing at the great writhing mass of noodles. “Except from the tentacle dimension.”

“What?”

“I pulled her through a portal I designed this afternoon to see into other dimensions,” Twilight explained. “Notice the colors? Same as in your mane.”

“Is this a joke?”

“This is a prank.”

“So that’s not actually a tentacle dimension version of me?”

“Oh.” Twilight laughed. “I see how you might make that mistake. Yes, that really is a tentacle version of you. No, it isn’t a prank. The prank comes later.”

“Huh.” Dash examined the flipping, flopping mountain of rainbow noodles. “So what do you mean, she’s me?”

“I mean that she is exactly, perfectly identical to you in every way,” Twilight said. “Except that’s she made entirely of tentacles. Because she’s from the tentacle dimension.”

“What’s the tentacle dimension?”

“A dimension that is exactly, perfectly identical to our own. Except everything is made entirely of tentacles.”

“When you say everything…”

“Everything,” Twilight said. “The ponies, the animals, the birds, the trees, the grass, the water, the dirt, the buildings, the roads—all tentacles. In the tentacle dimension, even the air is made of tentacles.”

Rainbow Dash thought very seriously on that, before asking, “Is she as awesome as me?”

“You should go find out for yourself,” Twilight said. “Introduce yourself to her.”

“Um, no thanks.”

Twilight looked confused, or pretended to look confused. Dash couldn’t  tell. “I thought the great Rainbow Dash wasn’t afraid of anything? Tentacle-you won’t bite. At least, not any more or less often than pony-you does.”

Rainbow Dash thought Twilight might be surprised to find out just how often that was, but she rolled her eyes and stepped forward anyway. She stopped a little ways away from the tentacles, which she found appeared much larger and more imposing close up. Standing next to the mountainous mass of tentacles, Dash began to feel very small.

“Uh, hey.” She held out a hoof. “What’s up?”

The whole mass of tentacles reacted to her presence and seemed to shift itself towards her, making slippery, sloppery sounds like a pair of freak dancing mops doing the tango. It reached a single tentacle out towards Dash’s hoof, about the same size and thickness as her leg.

Dash considered running away. But that wasn’t what cool ponies like her did, so instead she asked, “See any good movies lately?”

The tentacle didn’t answer. It did, however, touch her hoof.

Rainbow Dash tensed, but kept her leg stretched out. Maybe it just wanted a hoof-shake? So she shook her hoof up and down.

The tentacle matched her movement. But when they both stopped, it didn’t let go. It began to move past her hoof and along her outstretched leg. It was a little wet and sticky, but surprisingly smooth and soft, like a damp blanket. It twisted in circles around her leg, slowly and curiously, as if exploring someplace new and unfamiliar for the first time. Dash giggled as it moved further, tickling her coat. Its touch was pleasantly gentle.

Then Dash noticed that several other tentacles had broken away from the mass and begun moving towards her, some like snakes along the ground and others gliding through the air like eels through water. She tried to back up, but the tentacle on her leg tightened.

“Uh, Twilight?”

“Don’t worry,” Twilight called from behind her. “It’s just saying hi. Just stay calm and you’ll be okay. Don’t be scared.”

Obviously, the last thing Rainbow Dash ever felt was scared, and especially not of some silly rainbow noodles. She relaxed and tried to calm her breathing as the tentacles drew closer.

What was the worst that could happen?

They all reached her at once. The ones on the floor touched the bottoms of her other three legs, and began climbing, slithering up. From the air, the others touched down on her withers and neck. They all began moving along her coat much like the first had, smooth and gentle, poking and prodding. After Dash got used to the sensation, it actually started to feel a lot like the time Fluttershy had given her a massage. Besides the lingering wetness left behind wherever the tentacles touches, it wasn’t all that strange or unpleasant at all. The way the tentacles squeezed and rubbed her coat as they moved was oddly soothing, and Rainbow Dash started to relax.

The tentacles on her withers pushed into her wings and started prodding at her feathers.

Rainbow Dash flared her wings wide. “Yup, those are wings,” she said. “Pretty cool, huh?”

The tentacles certainly seemed to agree, as they began to knead her feathers, moving outwards and pulling and tugging at all of her primaries. It felt like a perfect preening session, and Rainbow Dash bit her lip. They were crazy good at this, but that made sense. They were technically her, and she was crazy good at everything. Especially preening. And flying and horseshoes and stuff.

The tentacles on her legs reached her flanks and began massaging and kneading just like the ones in her wings. She felt them move along both her cutie marks and the insides of her thighs, stroking and nudging and curling softly.

The smallest of squeaks escaped from between Rainbow Dash’s lips. If she was being totally honest, it had been a really long time since anypony (anytentacle?) had touched her like this. Like, a really, really long time. That was mostly because everypony in Ponyville was super lame and uptight and not even worth her time, and maybe because she got turned down a lot, too. But probably not that second one. That didn’t actually happen. Regardless of the reasons, Dash had forgotten how nice a caress or a stroke on her wings or her neck or her flanks could feel. And her body apparently wasn’t able to tell the difference between a lover’s hooves and a tentacle mass’s curious feelers, as a familiar warmth and wetness began to build between her legs.

The tentacles seemed to notice the change, as just then, the tentacles on Rainbow Dash’s thighs slid further in and touched the very edge of her slit.

Dash’s eyes opened wide and she jumped backwards. But all of the tentacles tightened around her limbs, holding her in place. Rainbow Dash jerked to the side, but the tentacles tightened around her, and even more tentacles were already approaching.

“Hey, uh, Twilight!”

“You’re fine,” Twilight called back. “She’s behaving entirely normally. That’s how ponies greet each other in the tentacle dimension. She’s just being friendly.”

Dash briefly wondered why Twilight was still so far behind her, but immediately forgot about it when the tentacle between her legs slid along her marehood again.

In spite of herself, and in spite of how embarrassed and violated and frightened she should have felt, Rainbow Dash completely relaxed as the wet, soft-but-firm tentacle stroked up and down the outside of her slit and curled all the way around her mound.The tentacle’s slightly pointed end prodded softly at her most sensitive spots. The other tentacles loosened somewhat, but still held her, keeping her in place. Dash knew she should have struggled, especially as new tentacles appeared along her stomach and her neck and her legs, but the kneading in her wings and massaging between her thighs and caressing underneath her chin were all too soothing and pleasant too resist.

Dash wondered if tentacle-her had any idea what it was doing, or if it was all random exploration and experimentation, or if ponies really did greet each other like this in the tentacle dimension, and, if so, why didn’t they do so in her dimension, but soon stopped caring or thinking about anything but the growing heat inside of her and the warm, wet tentacle toying with her most private and sensitive of parts. Before, the moistness of the tentacles had been a little annoying, but now it worked as an absolutely perfect lubrication. The tentacle was like the longest and most flexible of tongues, and it lapped and licked and swirled at the whole of her now-dripping sex.

Finally, the tentacle pushed itself into her slit, just barely, still swivelling and thrusting lightly, and Rainbow Dash, all else forgotten, moaned long and loud, and the tentacle curled around her clit and squeezed and stroked and loosened and squeezed again, and Rainbow Dash came right there, standing in the middle of the library basement, a dozen slippery tentacles reaching all across her body.

The tentacles all let go at once, and Rainbow Dash fell down to the cold floor, sweating and breathing hard. She suddenly realized where she was and what she had just done and who she was with and what the warm puddle of something she was lying in must have been.

She jumped up to her hooves, still a little shaky, and turned around saying, “That wasn’t what it looked like!”

But Rainbow Dash found that, somehow, while she had been distracted a wide, translucent, glowing, purple bubble had grown around her that covered nearly all the basement except for the stairs. And Twilight stood just outside of it, smiling and waving at her.

Dash trotted up to the bubble wall and poked at it. It was solid as a brick wall. “What the hay is this?” she asked.

“A magical barrier,” Twilight said, smiling, her voice muffled.

“This is the prank?” Dash felt something touching the back of her leg. She looked down and saw a tentacle. She nudged it away before turning back to Twilight. “You did all this just to trap me in a bubble in your basement?”

“Oh, no, no, no,” Twilight said. “Or, well, I suppose this is a kind of subsidiary prank to the main prank, which already occurred, still is occurring, actually, and will probably continue to occur for quite some time.”

Another tentacle brushed Dash’s leg, and she pushed it off. “Then what’s the real prank?”

“I told you that you and tentacle-you were identical, except for the difference in number of tentacles between the two of you,” Twilight explained. “That wasn’t true. You two aren’t identical. There are three key differences. Besides tentacle quantity, of course.”

“Whatever,” Dash said, and kicked at another annoying tentacle that had appeared on her leg. “What are the differences?”

“As I unfortunately discovered when I first pulled tentacle-you across the interdimensional border, and what occupied my entire afternoon until I was able to, barely, get away from her, is that tentacle-you has an incredibly high, practically insatiable libido, enormous strength, and an unbelievable resistance to unicorn magic. Spells don’t work on her almost at all, and that combined with the other two differences, along with your same love of insensitive, selfish pranking, all mean very bad things for anypony who happens to make contact with tentacle-you.”

“That’s not even a prank!” Dash kicked away another couple of tentacles, which were becoming both more numerous and more insistent. “That’s just a lame lie.”

Twilight shrugged. “If you say so. But I realized, why should I prank you when you can prank yourself? You are, after all, Ponyville’s top prankster. Who better to help me get back at you than you? More specifically, who better to get back at pony-you than tentacle-you?”

Two tentacles wrapped around one of Dash back legs, and a third had begun curling around her waist. “Back off already!” Dash cried, trying to shake them off, but the tentacles held fast.

“Like I said, tentacle-you enjoys pranking just as much as pony-you does. Unfortunately, she’s not very creative, and all of her pranks involve non-consensual coitus. Really, that’s all they are. I wouldn’t think that could qualify as a prank, but you’re the expert. I wouldn’t have thought dropping balloons full of ketchup and mustard and mayonnaise and glue and salsa on a pony while she’s trying to relax and read an incredibly valuable historical text on her balcony could qualify as a prank, either. But you’re the expert.”

“What are you talking about?” Dash asked as she continued trying to shake off the colored tentacles, more and more of which were appearing on her legs and back every second, each gripping one of her limbs and not letting go.

On the other side of the bubble, Twilight grinned. “Well, I’m talking about how tentacle-you is going to prank pony-you. And by prank, I mean that she’s going to fuck you again and again and again, and then you’re going to beg her to stop, and then she’s just going to keep fucking you until you pass out, and even then she’s going to keep fucking you until wake up just long enough to come and then pass out again, and then she’s still going to keep fucking you.”

“What?!”

“Do you really want me to repeat all that?” Twilight asked. “I feel like I was pretty clear.”

“Are you being serious?” Dash asked, trying to kick off more and more tentacles, even as it became clear that she was never going to be able to fight off all of the tentacles, and soon things were going to get much, much worse for her if what Twilight said was true.

“I told you this was about the Sylph Psalter,” Twilight said. “And I’m always serious about the prosody of Pre-Discordian Era unicorn poetry.”

Rainbow Dash got ready to scream an obscenity at the deranged unicorn, and at the annoying tentacles on her legs, and to ram the stupid magical barrier with everything she had. But just before she had a chance to do any of that, a whole storm of tentacles passed over Rainbow Dash’s head.

Green, red, blue, yellow, some of the thickest tentacles Rainbow Dash had seen yet, wide as tree trunks, dozens of them, slid quickly through the air over top of her. Dash cowered down, knowing she had no hope of escape. Even if she tried to run, where could she run to? Twilight had hopelessly trapped her. Dash pressed herself low to the floor, awaiting the inevitable, but she had to admit, it was a pretty good prank.

But the tentacles didn’t come for her. They passed overhead, then straight through the bubble barrier as if it wasn’t there at all, and seized Twilight instead. They lifted her up into the air and pulled her inside her own magical bubble. Twilight’s eyes were as wide and surprised as Dash’s grandmother that time she had woken up from the coma one of Dash’s pranks had put her in and found that she’d gained forty pounds because Dash had fed her mashed up cake and gravy everyday she was out. The tentacles dragged Twilight towards their main body, where a thousand, million other tentacles waited for her.

A great burst of heat and light erupted from Twilight’s horn and slammed into horde of rainbow tentacles. The tentacles merely flinched, and pulled Twilight more quickly towards them. Twilight let out a terrified squeal, cut off abruptly when a tentacle wrapped around her face and plunged into her mouth. Silenced and bound, Twilight was pulled into the jungle mountain of tentacles.

While the rest of the tentacles were distracted with Twilight, Rainbow Dash launched herself into the air with a mighty flap of her wings and pushed herself up fast enough to break free and away from the tentacles. She allowed herself a moment to smirk and glance at the little bit of lavender leg still visible in the now violently writhing body of tentacles. The leg twitched and shook with every thrash of the tentacles, and Dash thought she might have heard some muffled screams. Of course, Dash had known how this would turn out. No pony got the best of Rainbow Dash when it came to pranks, especially not some silly, uptight librarian. Dash was, and would continue to be, the top prankster in Ponyville.

Dash turned around, ready to leave Twilight to her deserved retribution, then leave the library altogether and track down her cloud from earlier so she could continue her nap.

Then she ran muzzle-first into the magical barrier.

It hadn’t disappeared, and one of the tentacles she had escaped began to slide up her leg again.

Dash swatted the tentacle off and propelled herself away. She didn’t know a lot about magic, but she knew unicorns weren’t supposed to be able to cast spells when they were too distracted, and Twilight seemed pretty darn distracted right now, what with being mercilessly spit-roasted by tentacles and all. And yet, Dash confirmed as she flew along its border, dodging over and underneath the tentacles that reached up into the air towards her, the magical barrier still stood solidly between her and freedom. In the very least, it should have been weakened, and probably was, even if it didn’t look it. Maybe enough for Dash to break through. It was her only chance, besides finding some way to extricate Twilight from the tentacle mass, which Dash had no interest in doing. How else would Twilight learn her lesson? Or Dash could wait for the tentacles to get bored of the unicorn, which probably wouldn’t take that long. Twilight was really boring. But Dash didn’t have the patience for that.

She twisted between another pair of tentacles, planted her two back hooves against the barrier, and launched herself off of it. She rocketed through the air, legs outstretched before her, aiming straight for the very top of the barrier. Either she would break through, or… well, she would probably break through. She was Rainbow Dash, after all.

Dash collided head first with barrier, and everything became pain and ringing and blurs. She was dimly aware of the sickening, weightless sensation of falling, but could think of nothing past the splitting pain in her head and legs, and clenched her eyes shut, preparing as best she could for the inevitable second impact.

But Dash stopped falling. She opened her eyes to find that a hundred multicolored tentacles had caught her, and were already wrapping around her legs and wings again. Dash jerked herself to the side, feeling sick and tired and like all she wanted to do was lie down, and tried to kick and buck at the tentacles and flap her wings. It didn’t work. More and more tentacles appeared all along her body, but Dash only kicked and bucked harder. No pile of noodles had ever gotten the best of her before, and she was damned sure they weren’t gonna get the best of her today, no matter how much her head hurt.

As she struggled, she noticed air rushing quickly through her mane, and the whole basement spinning by dizzyingly fast. Before she had time to figure out what was happening, the barrier slammed furiously into her head again.

For a long while, Dash couldn’t see or hear anything. She couldn’t feel a thing. Then the pain returned, ten, twenty, a hundred fold. Pain was everything, and there was nothing else. Except for nausea, and the feeling of being swung about in the air like a rag doll. And the hundreds of tentacles slipping all across her body, binding her legs and wings, reaching all over and everywhere, and her powerless to do anything to stop it.

When she opened her eyes again, she saw the basement floor hanging over her head, and her mane stretched out towards it. Something thick and warm and red slipped from her chin to her cheek to her forehead and fell upwards into the air above her. She realized that she was dangling upside down. The tentacles held tight around each of her legs, around her whole waist and chest. Even if she could fight past all the dull pain in her head and struggle, all she would have been able to do was wiggle now. Their grip was too strong. But wiggle she did, as much as she could, but it didn’t do her any good.

The tentacles abruptly tore her hind legs in opposite directions, spreading them wide, too wide, much wider than she’d ever seen them go. Dash’s thighs burned furiously, feeling as if they had been ripped apart, and she cried out.

She looked up and saw a large, pointed tentacle appear and hover over her totally exposed pussy. It poised curiously above her for a moment, then plunged down in between her legs and inside. All gentleness forgotten, the tentacle drove inside her, harsh and unsympathetic. It forced her tight hole open wider and wider, pushing deeper and deeper, and she cried out again, whimpered pleas for mercy.

The tentacle, incredibly, stopped. But another instantly appeared by her mouth, slipped up her chin, and touched her lips. Dash clamped her mouth shut and turned her head away, but another tentacle held her head still while the first lunged at her mouth. It pushed its way past her closed lips, then forced itself even through her teeth. It wrapped around her tongue like a vine around a tree limb, and then slipped down into her throat. Dash gagged and screamed, but the tentacle completely filled her mouth, and the sounds came out only as low, muffled groans.

Above her, between her legs, the other tentacle began its push inside again. It drove deep, deep, deep, filling her past her every limit. Her muscles clenched desperately at the smooth, slippery flesh of the tentacle, only making every centimeter it pushed further more painful. Deep, deep, deeper than she thought possible, deep until she thought it couldn’t possibly go any deeper, but deeper it went. Rainbow Dash, violated, humiliated, gagged, helpless, could do nothing but twitch and squirm in the tentacles’ grip.

Finally, the tentacle paused, but only for a moment. It drew back out of her an inch, her inner muscles still clutching at it all the way, and then it slammed back inside her again. It pulled out, then charged in again. And then again and again and again. Each time, her whole body lifted up towards the tentacle as it pulled back, and the collapsed and shuddered when it drove back inside. Again, again, again. And each time the tentacle pushed in more easily, but more forcibly, faster, faster, faster. Instead of going numb, Dash felt more and more acutely the slippery, soft-but-firm texture of the tentacle sliding along the flesh of her inner walls. A horrible, shameful pleasure grew inside her, a heat and pressure building in her abdomen, a twisted pleasure from being fucked harder than she ever had before, her helpless to do anything to stop it, and all the more overwhelming for being horrible and shameful.

She felt another pointed tentacle, near the first. It slipped almost leisurely along the inside of her thigh, around her gaping, dripping, filled pussy, and then around the base of her tail, and pressed up against her ass. Without giving her even a moment of preparation, the second tentacle drove inside her second hole, just the same as the first had. it pushed in deep, deep, deep, never stopping, always driving further, while the first tentacle continued pumping brutally in and out. But her ass was tighter, dryer, and the second tentacle’s push inside was harder than before, more painful, and in some bizarre, broken part of Dash’s mind it was as better as it was worse. The tentacles wholly filled both holes, and another tentacle was still down her throat, and it was all as arousing and pleasurable as it was painful and mortifying.

Just as the first, the second tentacle only stopped when it truly could not possibly plunge any deeper. And then it pulled out, and thrusted quickly back in. Again, again, again. In rhythm with the first, one then the other, her pussy then her ass, one then the other, slamming in and out. The two tentacles, separated by what seemed only the thinnest layer of flesh, filled her more than she had ever thought could be possible, and they rutted her hard and fast and ruthlessly. She couldn’t struggle or squirm, hanging upside down, blood rushing to her head, a thousand wet tentacles with free reign of her whole body, feeling, touching every part of her. She could only whimper and accept each savage thrust.

Her body shuddered, from her thighs to her shoulders, in one great wave, and Rainbow Dash came, warm liquid spurting around the tentacle that was pumping and stuffed in her marehood, and the cum slipped quickly down her thighs, down her stomach, across and through all the writhing tentacles, down her chest, her neck, her chin, and finally dribbled onto her lips, her own fluids, her own essence, and, though she knew it was hopelessly wrong and obscene, the musky taste and smell only made her feel more turned on. The tentacles didn’t let up for even a minute. If anything, they fucked her faster, harder, more violently, and Rainbow Dash moaned openly against the tentacle in her mouth.

A tentacle that had been grasping at her wings moved down to her neck, and wrapped around, round, round her throat. It pressed down against her throat, and she felt the tentacle inside and the one outside, nearly touching, and her breath became a hoarse trickle around the two.

As the tentacles plunged in and out of her, both of her holes wet and loose and absolutely yielding, yet another slid along her thigh, and this time rested on her hard, exposed clit. It began to curl around her stiff nub, squeeze, stroke roughly then furiously, and the sensations were immediately overwhelming. From between her legs, unchecked, shameful pleasure wracked her whole body and as the tentacle stroked her clit and the other tentacles slipped easily in and out of her, and another slipped further down the inside of her throat, and another pressed harder down on the outside of her throat, and great trembling waves of heat and electricity rushed out from her clit and pussy and a kind of terror and another kind of excitement and then more pleasure rocked her whole self, swept through every inch of her body, and she bucked her hips helplessly against the staggering, ruthless flood of feeling and sensation and emotion. She came again and the pressure and the heat exploded inside of her and the tentacles stroked, rubbed, kneaded her clit and the pressure exploded a third time, instantly, in her head, and there was nothing but the release, her and the sweet, blissful, undying pain of release.

The tentacles finally let her go, and she fell to the floor with dull, wet thud. She lay on the floor, limp, dripping everywhere with she didn’t even know what, shaking with aftershocks of three consecutive orgasms, her breath ragged and hoarse, every part of her bruised and everywhere sore.

Her vision cleared and she saw that the magical barrier was still up. She turned her head weakly and saw Twilight still lost in the jungle of tentacles. The tentacles had shoved Twilight’s face into the floor and raised her rear up into the air, and three tentacles had stuffed themselves into her ass. They fucked her mercilessly, and with every thrust Twilight cried out in a squeaky, exhausted voice, her eyes rolling into the back of her head.

Dash allowed herself the smallest and weakest of chuckles. At least Twilight was getting hers, too. But now it was time for Dash to get out of here. She heaved and pressed a hoof flat on the floor beneath her and pushed herself up. She took a single step towards the barrier, and then her legs buckled, and she collapsed on the floor and did not move except for her heavy breath. Too tired. Too sore. She couldn’t go anywhere. Even if she could make it to the barrier, only Twilight could bring it down, and Twilight was as trapped as she was.

Dash noticed then that one more tentacle had wrapped around her leg, and it began to slowly drag her backwards across the floor, back towards the mass of tentacles.

Rainbow Dash knew that she could not fight it, could never break free, didn’t even know if she wanted to. She would be the helpless plaything of a million, billion lust-driven tentacles for hours, at least. She would be fucked again and again until somepony came to rescue her. But who could? Rainbow Dash was the fastest flyer in Equestria, and she hadn’t been able to outfly it. Twilight might have been the strongest unicorn who had ever lived, and she was getting fucked harder than Rainbow Dash right now. Their friends might come, but the best they could do would be caught the same as her and Twilight.

As she was dragged across the floor, a trail of come and sweat following in her wake, Rainbow Dash began to consider for the first time that she very well might never escape. Those tentacles could do anything and everything they wanted to her for hours, days, maybe months maybe years. She wouldn’t ever be able to do anything to stop it, and neither would anypony else. She was totally and absolutely at the mercy of the tentacles.

She tried to wriggle pitifully out of the tentacle’s grasp, but immediately a dozen more sprung out and curled around her other limbs and held her still. Another wet tentacle slipped along and then into her slit, and Rainbow Dash whimpered as it all began again. As it would again and again forever. No escape. No help. No mercy.

Dash’s only consolation was that, since the tentacles were really her, just from another dimension, she was technically still the top prankster in Ponyville. She just wished she knew what the hell a Sylph Psalter was.