'RAINBOW DASH: SUBJECT 02' read the large block capitals, emblazoned on the wall before her.

This was not Rainbow's home. Instead of her lumpy cloud walls the room she was in was one of dull, corrugated metal.

Rainbow's chin was resting on something sickeningly warm and moist. Whatever it was Rainbow was laying atop it as she would a bed. But this was not her downy bed of clouds. This was something alive. It felt like she was lying on top of... another pony. A shaved pony. Or something even larger than a pony. Was she sleeping on the back of some great hairless beast? That didn't sound quite right. None of this did.

She looked down.

She was lying astride a cock. A stallion's member so large that it was acting as a bed for her, its girth so great that her hooves didn't even touch the ground on either side of the massive shaft. Behind her buttocks she could feel the cushion of its two enormous testes, each the size of the cart that AJ used to transport her apples to market.

The comically oversized penis was an odd shade of light blue, the flare being slightly a darker shade, as were the veins running up and down it. One vein passed directly beneath her own chin and she could feel a heart beat thumping through the monstrous appendage as she placed a hoof on it to push herself away from the thing.

Rainbow flapped her wings in a desperate effort to take off, fly up into the air. To get off this revolting affront to nature. But she found herself unable to do so. A tugging sensation and a stab of pain shot through her groin area and she collapsed back onto the soft and spongy surface of the giant cock.

She could feel her heart pounding as if it were about to tear out of her chest and her horror only grew when she realized that the pulse she felt beneath her hooves, coursing through the ridiculously swollen member, was in time with her own.

She stared down at her crotch in panic and in that moment her worst fear, a fear she never even knew she had, was realized. She was one with the giant cock. There weren't even any signs of stitches or scars. Her crotch area was simply merged with the base of the disgusting abomination as naturally as her wings or legs attached to her torso. It was a part of her body. Or maybe it would be more accurate to say that her body was a part of it, as the grotesquery was larger than she was.

She reached behind herself, chills running through her body as she brushed past the wrinkled blue skin of her new balls, to confirm that: yes, she did indeed still have her own marehood and her flank, tail, tail-hole and back legs and they were still intact and unharmed.

How was she even alive? How was her heart even pumping enough blood to feed this mammoth leech of an organ? Was this all a nightmare? It all felt so real.

She stared frantically over her shoulder. The ball sack... her ball sack... was lightly forested with hair. Not fur like on her body but thicker, more sparse strands of pubic hair. These hairs were a rainbow array of colours just like her mane. The multicoloured pubes were almost laughable but somehow Rainbow didn't feel like laughing.

Rainbow touched the spot where her crotch joined to the gargantuan horse cock. No way to detach it short of tearing through the flesh. Would that be her only option? To pull until it ripped off?

She couldn't walk with this thing acting as a part of her body, couldn't even touch the ground with the swollen giant beneath her, much less fly. She punched a hoof at the meaty member and immediately regretted it.

"Aaagh!" Rainbow cried as pain sparked through her, "I can... feel through this thing? It really is... a part of me..." The smooth skin of the shaft twitched as if in friendly reply.

There was a banging and rattling and a metal panel on the wall to the right of her slid open, revealing a smooth chute running upwards into darkness.

An escape route? Only if I can tear off this stupid thing... thought Rainbow.

"Woooooooooow~ Woooooooh~ Woooaaaaaah~ Woooooohoooooo~" a familiar voice echoed through the room followed by a squeaking and banging noise as a grinning pink mare slid out of the chute and tumbled onto the floor in a pile of grins and giggles.

"Howdy doody, Dashie-Dashie!" smiled Pinkie as she stood up and stretched, "That was so much fun! This place is like an amusement park, sometimes! Kinda wish it was a little more colourful though... maybe some balloons?" Pinkie pondered the décor, or absence thereof, of the cell that held Rainbow Dash.

Rainbow was stunned into silence. Her friend was sporting a phallus as well. Pinkie's was still quite large by normal stallion standards but nothing compared to the aching monstrosity that lay underneath Rainbow like a big meaty couch.

Rainbow's eyes stayed glued on Pinkie's cock as it swung back forth during the pink mare's lengthy nattering about the merits of balloons as decorations. It was about half the length of Pinkie's foreleg and at least as thick. Aggressively pink and, unlike Dash's, completely hairless.

"Wow, Dashie! They really gave you a big one! Like... reeeeeaaaally big! I don't even think full grown dragon's have dongles that are quite that huge!" Pinkie gave the macro-member a playful prod.

The shock of contact on her new sensitive organ jolted Rainbow back to reality.

"They? Who's they? Where are we? What's going on? How'd you get down here? What have they done to me? Why? Where are the others? What-?" Rainbow fired a barrage of questions at Pinkie who simply stared blinking back at her, a half smile playing across her face.

"What was that, Dashie? I can't here you from all the way on top of that sausage mountain between your legs! Gimme a sec and I'll climb up!" laughed Pinkie, jokingly. She trotted cheerfully around Rainbow, hunting for a spot that would give purchase.

Finally she settled on the back way. She leapt forward and began scrambling up the two enormous mounds of flesh that were Dash's balls. Her hooves scrabbled to find purchase on the loose skin of the testicles but she slowly bit and clawed her way up them.

Rainbow gasped, "Pinkie stop. Aaaah, stop, stop, stop! Get off!"

Dash chewed her lip as Pinkie reached the summit, the entirety of the mare's weight pressing down on one of her mega-nuts, squeezing it against the cold steel floor beneath her.

Pinkie chortled as she tumbled, head over hooves, down the slope of the scrotum to land at the base of the shaft, right behind where Rainbow was attached to the goliath dick.

Pinkie landed astride Dash, who was astride the big blue dick. Dash squeaked as she felt Pinkie's own 'dongle' flop onto her back, resting between her shoulder blades.

"Pinkie! What's going on?" Dash weakly managed from underneath the pink mare, still panting from the stress of having a pony clamber over her balls.

"Oh, we're dreaming! That's the only explanation I can think of that makes sense!" laughed Pinkie as she admired the view from atop Rainbow's back, "Geez, this thing looks even bigger from on top of it."

"But... it feels so... real..." Pinkie Pie's weight on her back was pressing her against the hot skin of the shaft and the intimacy was making Rainbow's skin crawl.

"Oh, don't be embarrassed Dashie! I have naughty dreams all the time! It's perfectly natural. Careful you don't squirm too much. If you roll this thing over onto its side you might end up underneath it and that wouldn't be much fun at all, no sirree~" Rainbow shuddered, she could feel Pinkie's rod bumping against the back of her head. It was getting harder.

"Squashed flat as a pancake by a big dick rolling pin,
Just what a mess me and Dashie could get ourselves in,
But naughty dreams are fun if they're with me and Dash,
So just you relax and I'll get you off in a flash~"

Pinkie bounced up and down on Rainbow's back as she sang, her now fully erect and bright pink cock slapping wetly against Dash's back. Rainbow whimpered as she was squashed down face first into the phallic giant beneath her.

"Knock it off, Pinkie! If you know how to get me off then hurry up and do it!" snarled Rainbow Dash as her pink rider concluded the impromptu ditty.

"Sure I know how to get you off! I told you! I have naughty dreams all the time!" Pinkie shivered with pleasure as the tip of her cock scraped against her friend's technicolor mane.

"So hurry up and get me off this thing!" cried a much exasperated Dash.

"Oh," Pinkie snorted with laughter, "Oh, no, no Dashie! I think you and I were talking about different meanings off 'get you off'. Still, this is gonna be super fun so just try and relax, kay?" the excitable pink earth pony leaned back, lounging onto the swollen pillow of Dash's balls as if they were a deck chair on the beach.

"Wait... if this is a dream... then is it my dream or yours? I... I don't think this is a dream... I don't ever have dreams that feel like this... this is way too real... and I felt pain earlier... Pinkie? You don't feel pain in dreams do y-" Rainbow was cut off as Pinkie began massaging her rump, using her baker's hooves to expertly roll and squeeze Dash's muscular flanks as if she were kneading dough.

"You're so cute, Dashie. I have dreams about you more than any of the others. You always hang out with AJ more than you do with me, though. It's no fair!" she spread Rainbow's ass cheeks wide open, plonking her own member between them and then squeezing them shut. Her cock now sandwiched tightly, like a soy hotdog between Dash's buns, she started rocking idly back and forth, her cock twitching every time the tip of it touched the base of Dash's rainbow tail, "Your cock is way too big for my little hooves. But I'll make it squirt Dashie. I'll make it squirt, somehow."

Rainbow felt a tightness forming in the enormous member beneath her. The perverse nature of the situation was starting to get to her. Could this all be a dream? Even if it was... how could she let herself be excited by this? This was madness. And yet, despite her mind's reluctance, she felt the smooth surface of the cock beneath her shift as the enormous member began to become erect.

Pinkie leaned forward, sending trembles through Rainbow's body as she whispered in the sky-blue pegasus' ear, "They milked me already. So many times. It felt so good. Better than a hundred birthday parties combined. I filled up so many of their cylinders. And I imagined it was you I was filling up each time. But rubber toys and suckey thingamajigs can't compare to the real deal. And I still have so much left inside me. I saved the rest for you Dashie."

Rainbow drew a sharp breath as a wet pink tongue began exploring her ear. The enormous cock was inflating like a jumping castle beneath her. She had thought it was big before but now... The skin around it felt unbearably stretched as the brute grew rigid. Waves of heat wafted off its surface, Dash felt as if she were standing in front of a furnace.

"Pinkie... ah... no! This is... insane... even if it is a dream... this is crazy... stop!" Rainbow's marehood had started to moisten already.

Rainbow felt as if she were indeed floating on a bed of clouds. So lightheaded. So dizzy as the ridiculously large cock sucked blood from her body to distend itself to even greater proportions. Her lips went numb as a buzzing, tingling sensation ran through the ocean of flesh that made up her shaft.

"You okay, Dashie? You've gone so pale~ And is it just me or is this thing underneath us getting even bigger?"

Pinkie withdrew her hips and touched the shockingly pink tip of her horse cock to Rainbow's dripping marehood, "Dashie's getting turned on by all of this... I know this must be a dream now! The real Dashie wouldn't get this wet from just a little teasing," she sighed, "You know, I was kinda hoping it was actually real. Oh, well... let's start the party then."

"No! Pinkie, no! I don't care if this is a dream! I don't want this! Stop!" Rainbow finally managed to muster up some more authoritative tones in her voice. She twisted her head and glared at Pinkie, who sat, squeezed between Dash's own rump and the two enormous meat boulders that were her new balls.

"But Dashie..." whined Pinkie, sadly holding her rock hard member in her hooves and making the best puppy dog eyes she could.

"No!"

"But it's winking at me..."

"No!"

"It's like a little bird trying to get food from its momma~ It's hungry, Dashie! It's gulp gulping at the air like a fish outta water."

Rainbow would have blushed if most of the blood in her head hadn't rushed away to feed the bloated erection that pulsated beneath the two of them.

"No means no!"

"You're no fun," pouted Pinkie. She turned and clambered back on top of Dash's gargantuan balls and seated herself at their summit, huffily crossing her arms and glowering down at Rainbow.

Rainbow writhed and squirmed, not entirely out of discomfort, as she felt Pinkie's weight press down on her again. The pressure was doing things to her that she couldn't believe. By the time Pinkie had settled atop Mnt. Testicle Dash's pussy had already leaked a miniature river that was running down the slopes of her megacock.

"What're you... what're you doing...? Get off..." her anger had already drained out and now she sounded as breathless as if she had just done her entire morning exercise routine in ten seconds flat.

"Dashie, if we don't drain these bad boys then they might just pop like balloons with too much air in them. I thought I could make you squirt if I gave you the ol' Pinkie Winkie treatment," she giggled at this and nudged her still rigid cock, "But I guess if you say no then I can empty them another way."

Pinkie tensed her legs and then sprang into the air.

"No, Pinkie wait-"

It was too late. Gravity had already sealed the deal. Pinkie hurtled back down, landing a full force a full force elbow drop on Rainbow's enormous ball sack. She bounced off it being sent right back in the air.

Rainbow made a strangled noise in her throat. The tip of her cock spluttered and squirted out a cup-full of precum onto the cell floor, like a tube of icing being sat on by a cow, her cum had almost the same consistency as icing. Pinkie landed once more, struggling to keep herself stable on the now wobbling surface.

"Hay! It actually worked! Don't worry Dashie! A couple more bounces and these things will be as dry as raisins!" grinned the pink mare as she bent her legs and prepared to jump again. Rainbow's vision blurred as she felt her friend springboard off her balls. She gritted her teeth in a desperate effort to avoid biting her tongue.

Pinkie plummeted down, knees first this time. The force of it compressed Dash like a grape being slammed in a door. She was so sure one of them was going to burst but somehow, impossibly, they held their shape. Another milky slurry erupted from the tip of her cock, vomiting down onto the already spreading puddle of spunk.

"This time I'm gonna jump extra high!" laughed Pinkie, tugging idly on one of Dash's rainbow pubes as she was rocked by the shock waves still rippling through the wrinkled flesh.

"Pinkie," whispered Dash, hoarsely, "Please..."

"My name's not Pinkie Please, silly. It's Pinkie Pie," she teased, nibbling playfull at a loose roll of skin.

"Please..."

"Please what?"

"The... other way..."

Pinkie played innocent, "Which other way was that Dashie?"

Dash's lips trembled, an unbearable mix of pain and pleasure rushing through her as she submitted, "F-f-fuck me..." she stuttered.

"Gee whizz, Dashie. I dunno. Bouncing on your big balls is so much fun," Pinkie idly stroked her shaft as she spoke, gripping it between her hooves.

"P-p-please fuck me... please... p-p-pound my p-p-pussy..." relief washed over as Pinkie slid off her over-sized balls and squelched in comfortably behind her rump, sitting squarely in the tiny pond of her marecum that had trickled out of her during the rough treatment.

"Anything for a good friend, Dashie. I'll fill you up so full that it'll force out all your nasty juices."

Pinkie wasted no time in positioning herself. She had not been exaggerating while waxing lyrical about Dash's beautiful cunt. The lips of the thing gaped as the mouth desperately suckled at her tip.

"Party time~"

Pinkie thrust forward all the weight she'd been using to torture Dash's testicles. Driving deep into the blue mare's aching pussy. She didn't stop until the tip of her cock bumped the tight opening to Rainbow's young and untouched womb.

Rainbow Dash was an athletic and active mare and it showed in the quality of her marehood. The passage gripped down with vicelike pressure, translating every quiver that Dash experienced directly into the throbbing cock that was splitting her open. It was gushing clear juices as if Pinkie had just plunged into an exotic blue fruit.

"Oh, Dashie! It's so good. So much better than the toys. I'd never imagined it'd be this tight. I don't even think I can thrust without cumming right away," moaned Pinkie, her hooves trembling as they gripped Rainbow's flank.

Simply feeling Pinkie inside her was keeping Rainbow on the razor's edge of orgasm. Her tail flicked and twitched wildly as she felt every inch of the penetration. Sparks of what felt like electricity ran through her as she was stretched to accommodate it: her pussy taking on the shape of Pinkie's shaft.

She could distantly hear her own shaft splattering watery precum onto the floor as her whole world was melted into nothing but pleasure.

Pinkie pulled back her hips, scraping her cock along the sticky, moist walls of Rainbow's marehood. She bucked forward again.

Pinkie hadn't been kidding about not being able to endure even a single thrust. But what a thrust it had been. She punched clean into Rainbow's womb, an arrow into the core of her being. Pinkie's seed was pumped deep into Rainbow. It inflated her womb like a balloon, the steamy substance swishing and swirling through her tubes. The entrance to her womb had been corked shut by Pinkie's cock and the baby batter had nowhere to escape to as it was mercilessly pushed inside.

Rainbow's own cock launched a single squirt, like a fire hose turned on for only a second and then immediately shut off, it showered the wall, staining the dull steel white.

"Oh, I'm so sorry. Ol' premature Pinkie strikes again. Don't worry, Dashie. I can cum a whole lot more. And so can you, I'm sure."

There was a loud hissing noise and the wall that Rainbow had just defiled split and slid open like elevator doors.

RAINBOW DASH: SUBJECT 02 was parted at the colon as the doors opened on an enormous shaft. The far wall of this new shaft featured similar letters:

SEMEN CONTAINMENT UNIT 03 and then an arrow pointing down into the dark maw of the open shaft.

"Guess they want you to squirt it all down there, Dashie. We shouldn't keep them waiting," whispered Pinkie, the last few drops emptying into her own private semen containment unit, Dash's womb.

Dash was barely conscious. She was drooling onto her own dick and twitching, her eyes swimming in her head, occasionally rolling back. The orgasm was simply unending and the young pegasus had been taken beyond anything she had felt before. To heights higher than she had ever flown.

"They're milking us, Dashie. They sucked out a lot of mine and stored it. Now the same will happen to you. I wonder what they'll use it for."

Pinkie did not muse on this for long. She drew back and then thrust into Dash again, launching Rainbow's consciousness into orbit. A spray of cum jetted out of Dash's overflowing cunt with each shove, speckling Pinkie's chest and legs with a galaxy of milky dots. Rainbow Dash's body quaked with the force of Pinkie's violating attack. There was something building. Something building deep within those vast orbs of meat behind the two of them.

"Pinkie... I'm s-s-scared..." mumbled Dash, her voice making spit-bubbles in the drool she was being slammed into.

"Don't be," Pinkie arched her back and thrust even harder, "It's all just a dream."

"All jus' a dream," echoed the sky-blue cum receptacle that could no longer do so much as remember its own name.

"That's right. Everything's... aahhh, mmmmhh~ A-okay! Soon you'll wake up and everything will be like normal. So just... aaaaah~ enjoy it! Have fun!" the cock beneath them was rumbling like thunder, like an earthquake, like a hurricane of semen was building up deep within it.

"Fu-fu-fuuuuh..." sighed Dash, no longer even able to imitate the words that were passing in one of her ears and out the other unheard.

A ripple past beneath them. It felt like sailing on the sea and having a sudden wave rock the boat from below. It coursed through the shaft and came bursting out the tip. Unceasing. Unrelenting.

A torrent of cum surged out of Rainbow Dash. A white flood ejected with unstoppable force. It slammed into the far wall of the chute and waterfalled into the abyss below.

Pinkie stared in awe even as her own cock juddered and ejaculated its comparatively pitiful load into Rainbow's already overflowing pussy.

The heat of the jets of spunk that were fired off wafted over the two of them, carrying with it moist droplets of seed, like a warm sea breeze. The scent was overwhelming, heady and carnal. Pinkie's cock squirted in time with Rainbow's, filling her up as she emptied her load.

Litre upon litre. Gallon upon gallon.

"Rainbow? You still alive?" Pinkie was answered by the feeling of the mare's heart still beating inside her cunt.

The wall of balls behind the two of them rose and fell gently, like the chest of a sleeping filly, as it sent forth its burden.

Slowly the stream steadily subsided until it was little more than a trickle. The doors slid shut.

"I wonder what they're gonna do with all that stuff... Dashie? You still passed out? Say nothing if I can keep fucking you while you're unconscious."

Pinkie was answered with silence.

She smiled.

"Perfect."

Author's Note

This chapter was longer than usual. I hope I'm communicating the rather complicated scenarios in a way that can be understood or imagined and I hope a lot of you have the same weirdly specific fantasies as me. I chose Pinkie over Pinkamena cos... I like Pinkie and the whole dark side thing is over done.

Anyway, Fluttershy (Or should I say futashy huehuehue... I am the first person to make that joke aren't I?) will be next and then I take requests for chars, fetishes and scenarios.

A lot of you making requests already... just wait 'kay? Imma do a voting type thing.