You woke up with a sudden start. There was the feeling of liquid running up your legs. At first you thought you had pissed yourself in your sleep but the liquid was far too cold. You could feel it begin to crawl up your bare chest as your eyes adjusted to the light, and you realized you were buck naked. Not only that, but the rest of your body was constrained, tied down by ropes to some sort of large pillar. Where the hell were you, and why was the blood rushing to your head?

Then you saw it. Accompanied by a huge quake, an incredibly massive object blocked out the light from above. You couldn’t believe what you were seeing, it was a gargantuan girl’s ass! Somehow you had woken up right underneath a humongous sexy butt. It looked huge! Big enough that it could crush your school with ease.

Even in a panic you couldn’t stop yourself from staring. Whoever this ass belonged to had an impeccable body. Her cheeks were round and smooth, not sagging at all, but definitely plump with a generous amount of juiciness to them. Her thick globes wobbled with the slightest movement, bouncing together in an erotic display. Between them you could see a cute little butthole and an enticing tight slit. As the giantess spread her big luscious thighs overhead, you couldn’t help but get aroused. This was definitely the biggest butt you had ever seen.

The cold liquid slowly drooled down to your face, breaking you out of your trance. Right, there was still the question of why and how you had even ended up here. You took another look at your bonds, you were strung upside-down with the ropes tying you to this pillar. They were thin, probably unnoticeable to the giantess, but definitely enough to hold you in place. Then there was the pillar itself. Your eyes follow along the length of it, the monolithic pole stood tall, and pointed straight at the giant girl’s gorgeous ass. The tip looked… sort of phallic? ...No way. This was a dildo!!

“What the fuck?!” you yelled, in a voice that sounded far quieter in your ears than usual. Not only had you been shrunken down in size, but your voice had been diminished too. Your thoughts raced, wondering how this could have happened. Then you saw a face. Between the supple thighs of the giantess, right behind the smooth cleft of her pubic mound, you saw a face that you actually recognized. It was Jane! Your sister’s friend!

-Flashback-

You were watching TV on the couch as your sister Chelsea invited her friend over to visit. Jane was a couple years younger than you, but that didn’t stop you from having a thing for her. Her body was well developed, especially around her waist.

You turned backwards from the TV just to watch her walk by the living room. The way her jeans hugged her plump ass was absolutely tantalizing. You only caught a glimpse, but you saw just enough of her gorgeous bottom walking upstairs to play it back in your head for the next couple hours. Your sister Chelsea however, didn’t follow her friend up to her bedroom. She stayed behind, giving you a stern look of disapproval.

“Mike! Why do you always do that?” she said angrily.

“What?”

“You’re always staring at Jane’s ass! I swear to god you’re like a mutt looking at a steak! It’s so obvious where you’re looking! Stop being such a creep all the time!”

You could have acted all offended, but she was right on the money. And with your libido raging, you didn’t really care.

“Yeah? So what? What are you gonna do about it?” you said back.

“Hmph!” your sister pouted, and stormed upstairs to where Jane was waiting. You felt like you had won that exchange. It’s not like Chelsea could actually stop your eyeballs from looking where you wanted them to. But as she stormed off, you thought you heard her mutter something like “Oh, you’ll see Mike…”

That part made you feel a little uneasy.

-End Flashback-

“Augh, that fuckin’ bitch. How did she even manage something like this?” you said to yourself.

You knew your sister Chelsea was still into reading those creepy “dark arts” books, but you didn’t think they were anything more than fantasy. For her to pull off something like this seemed impossible, and yet how else could you have ended up here? The last thing you remembered was falling asleep in your own bed, she might have done something to you as soon as you nodded off.

Regardless, there were far more pressing matters at hand. A gigantic swaying pair of butt cheeks was hovering directly above you and getting closer by the second. Jane didn’t seem to have any idea you were here, this must just be her enjoying some private time in her own bedroom. As sexy as it was having a front row seat to the action, being tied to her dildo was a little too close to comfort. Jane’s ass was definitely still the hottest thing around, but you needed to think with the head in your skull, not in your crotch. Considering how small your shrunken body was now, this was actually a very dangerous place to be.

Jane’s giant hand grabbed on to the side of the dildo, her fingers just missing your tiny, strung-up body. With your body tied upside-down like this, it meant your feet were positioned to be inserted first while your head at the bottom had a clear view of everything happening. The whole pillar jerked as she lined it up with her crotch. You could see her slit glimmering with juices, hungry for insertion. This was absolutely crazy, the view you had of her huge magnificent butt was unbelievable. Jane’s face was flush pink with colour, clearly aroused and thinking up some sexy imagery in her head to get herself worked up. You wondered why she even needed lube when she was this wet in the first place.

Then she adjusted the dildo one last time, pressing it up against her asshole.

“Holy fuck…” you whimpered.

Jane hesitated, her taut anus clenching against the head of the dildo. It pulsated against it, almost as if it was tasting the lubricated toy in anticipation. You could see the folds of her anal orifice kneading eagerly, the muscles of her body yearning to feel more. She let out a sharp gasp as then leaned back with her body. With a huge heaving motion, her perfect colossal ass lowered down and took the pillar inside.

Your mouth gaped as you saw the girl’s butthole widen around the dildo, it was unlike anything you’d ever seen. Sure you’ve watched porn, and seen tons of close-up insertions, but nothing like this. Being this small, you saw every detail, every single twitch and clench of her anal muscles. It was incomparable to watching it happen through a screen. But Jane’s ass didn’t stop there. The horny giantess continued to lower her ass towards you, and the very real fear of being crushed took hold of your heart. Her ass cheeks, which looked so appetising before, were now immense walls of flesh descending closer and closer to your body. You wrestled hard against the strings holding you in place, but couldn’t free yourself. You panicked and yelled, while Jane’s excited asshole started to eat the dildo all the way up to your legs.

“Jane! It’s me! Mike! I’m down here! Please stop!”

The tiny squeaks of your voice weren’t nearly enough to reach her, as Jane was already far too focused on feeling the hard toy burrow into her ass. She moaned out loud as the dildo spread through her insides, tickling the succulent innards of her voluptuous booty. Meanwhile you were shouting in despair as the massive rubbery asshole gobbled up your legs. Jane’s anus was insanely tight, and pressed down on your body with an incredible force. The lube helped ease it along, you winced as you felt every hungry band of her muscles throbbing to devour more of you. The pulsating butthole reached up to your waist and then stopped, staying there for a couple of dreadful seconds before it retreated backwards from where it came. You wanted to breathe a gasp of relief, but you knew this was only the beginning.

Jane’s ass slid back up the shaft, leaving trails of sticky lubricant behind it. She paused and then leaned back, pushing her enormous badonkadonk back down towards you again. Her massive cheeks closed in as she dropped, jiggling back and forth with the slight wiggles of her hips. Before her bulging asshole could seize around your legs a second time her backside globes got to you first. You were buried in a landslide of sweaty warm flesh, your body trapped between the incredible girth of Jane’s buttocks.

“Aaaaaahhhhhnn!! Yes! Right there!” she moaned, enjoyed the spot her dildo was leaning against.

Her juicy cheeks squeezed together, compressing your body in a sandwich of hot musky pressure. Jane’s buns were soft and squishy, but still absolutely humongous in scale compared to you. She pressed her ass lower, engulfing you in more of her bountiful backside, and you felt the anus return again. The twitching pucker sucked up your legs faster than before, squeezing and drooling all over the tasty little nub that was your body. You cried out in shock as it ate past your waist, painfully wrapping it’s tight folds around your stomach. With the way it was shivering you could tell it wanted more, to taste all the way up to your head, but before it could Jane pulled her ass back once again.

There was less of a pause this time between strokes, as Jane worked herself into a good rhythm. Her tremendous wobbling ass pounded back down the dildo, over and over, slathering your lower half with her anal muscles in the process. With your face positioned at the lower end of the dildo, you got one hell of a view, one that would stay with you for the rest of your life. Jane’s gigantic swinging booty, bouncing up and down on top of you, her fat ass cheeks dancing and jiggling as the smacked you head-on, you could see every detail as she masturbated. Her magnificent huge rear was swallowing the dildo, over and over, hammering it with such a fever that it sent tremors through your chest. It was as incredible as it was terrifying, and way more painful than you could have ever envisioned. Each slap of her whopping jiggly cheeks battered your skull on both sides, each push she made to drive the phallus into her ass made her backdoor crush itself against your ribs. You yelled and yelled for her to stop, that it was her friend's brother Mike she was fucking, but your voice was lost between the hefty smacks of her ass cheeks.

“Ahhhhn! Yes! That’s it! Oh god!” she panted above, really getting into fucking herself in the butt. The idea of watching Jane ram a thick toy into her curvaceous ass, moaning and humping like this would have been truly enticing to you, if you weren’t getting eaten alive by her shithole in the process. It was in that moment of getting ravaged by her giant gyrating butt that you heard her say something crazy.

“Ohhh yes! That’s it Mike! Fuck my asshole! Get right in there!”

You couldn’t believe your ears. Were you going mental from being pounded by her giant bubble butt one too many times? The juicy slabs of meat came down to crush you once more, but after she lifted them back up you heard her continue.

“Fuck my ass! You’re always looking at my butt right? Then give it to me! Plow my ass with your big manly cock!”

You were stunned. In a strange twist of fate your sister’s friend actually had a crush on you too. She was fantasizing about you taking the place of her dildo, ramming your dick deep inside her. Of course the real thing was technically happening, but not in a way either of you would have preferred. Damn your sister Chelsea! Once you got out of here you wanted to get revenge and make her watch as you fucked her best friend right in front of her! Well, IF you got out of here.

Jane’s ass seemingly got more worked up, ever since she started calling your name out loud. Her tremendous bouncing cheeks became an avalanche of flesh, two great walls nestling you deep inside them. She was getting hotter and sweatier as she rode the dildo, the salty beads of sweat rolled down the curves of her ass halves and splashed you in the mouth. You shouted at her to realize what she was doing, so she could stop before it was too late.

“Jane! I’m right here! You gotta hold back and stop masturbating! I want to give myself to you, but first you’ve got to stop! Your ass is too big, it’s swallowing me whole!”

You screamed as loud as you could muster, but with her huge monstrous butthole crawling up your chest it was hard. Jane moaned and leaned even further back into the hard shaft, smothering your face under the weight of her ass. It was stifling and tight, and you would feel her anus gleefully shuddering as it gobbled up your arms. This wasn’t looking good, and things only got worse as you realized you were actually starting to shift around.

Thanks to a certain someone’s poor tying job, the strings holding your tiny body to Jane’s dildo were beginning to loosen. While at first this would have been a great blessing, and could have secured your freedom, right now it was the worst thing that could possibly happen. Jane’s gigantic lusty ass was holding the dildo more than halfway inside itself now, making sure she could always feel it reaching deep into her bowels. This meant that your legs were always beyond the passionate grip of her asshole, and if you broke free of the strings holding you in place you’d be swallowed up with ease.

You let out a horrified scream as the strings unravelled around your arms. Without the bonds keeping you stuck to the dildo Jane’s ass was going to eat you alive! Her hungry farthole was inching closer and closer to your face with every stroke, until finally it was rubbing up firmly against your neck. You could see every detail of her massive throbbing pooper, the slime drooling from its lips, even the stretch marks made from its wrinkles spreading apart. Jane’s usually tight anus was pulled around your body like a fleshy elastic band, her once folded muscles had stretched smoothly into a huge and tender ring. Her asshole looked almost like a moist donut, it slobbered hungrily up and down your body, coating you in sticky hot juices. As the meaty pucker crudely smacked against your face, you could smell the foul scent of Jane’s insides. Her bowels were rank and steaming hot, and nearly about to consume your body inside of them.

After a couple more hard slaps by the giantess’s asshole you felt the strings leave your body completely. This was it, you were both figuratively and literally fucked. Jane’s massive jiggling backside dropped down the length of the dildo, and her anus slid straight up the length of your body. With less resistance on your body than before, you got to watch in horror as the girl’s beastly orifice swallowed past your head, engulfing you in hot flesh and absolute darkness. Your screams were cut off by the powerful clenches of Jane’s backdoor, and the horny moans of the goddess herself.

“Noo! Noooooo-MMMMMGHG!!”

“AAAHHNN Yes! Yes Mike Yes!”

Jane squealed loudly and her ass seized up around the dildo, crushing you in an iron tight grip. As she lifted her ass back up the long shaft and continued to fuck herself, your body was pulled along with it, hiding you once and for all from the outside world.

You wriggled desperately to escape the contracting hell of her butthole muscles, but your tiny struggles were just no match. The thick ring of rectal flesh was locked tight against the smooth surface of the dildo, creating a seal that you had no chance to break through. Instead, Jane’s thrusting movements pushed you deeper and deeper inside of her ass, squishing you mercilessly against her filthy firm walls. You wailed in pain as the contracting bowels wrapped around you, crushing you in their embrace. Jane was absolutely leaking a stream of juices from her pussy at this point, fully enthralled in the fantasy of getting ravaged by you.

“Deeper Mike! Deeper into my ass! It feels so gooooood!”

She was humping the dildo like mad, riding it in a fierce sweaty passion while shouting your name. The undulating walls chewed your body up like a piece of gum, steamrolling you ruthlessly under the heavy lumps of her anal membrane. As you gasped for air to breathe, a foul taste coated your tongue and burned your lips. Jane’s anal air was murky and rancid, just one breath and you felt like your lungs were on fire. You remembered the sexy girl your sister was friends with, and the tight jeans hugging the curves of her ass. This was where the air you were currently breathing came from, straight from the depths of her bowels.

With a massive lurch Jane slammed into the dildo, taking it nearly all the way to the base. The long piston jutted hard into her booty and finally you broke free from the clutches of her walls. You felt a huge weight lifted as your frame was no longer being clutched between flesh and rod, you could actually maneuver your body somewhat, but this freedom came at a steep price. When the giantess dropped her ass down next, the dildo’s head rammed your body dead on, driving you further into the darkness than ever.

“AUGH! NOO!! FUCK!! FUCK!!”

You screamed obscenities as you did your best to hang on to the dildo’s head, the smooth cap had only a little bit of an edge for you to wrap your hands around. Meanwhile Jane kicked her ass into top gear, pounding her giant jiggling cheeks into her mattress over and over again. Such wild motions made it nearly impossible to maintain your grip to the dildo, but it was the only thing stopping you from being swallowed up by Jane's voracious bowels. The tender walls pulsated and kneaded along your dangling body, coaxing you to let go and allow yourself to be devoured by them. Her huge thrashing ass was hungry to take something living inside of it. The dildo wasn’t enough. It wanted YOU. As far as its owner knew you were just a small nub tickling her insides, but deep inside her body had a feverish desire to guzzle you down and consume you whole.

“Cum inside me! Shoot it all the way into my butt! AAHHHN!!~” Jane yelled.

At that moment sparks of pleasure shot through her backside. Her massive butt cheeks quivered and she planted her fat ass flat against the surface of her bed. All around you her bowels began to cum, contracting on all sides with an incredible throbbing force. The squeezing undulations of her walls sucked you away from the top of her dildo and threw you into a spiralling nightmare of juices and clenching anal flesh. Your body was decimated under several tons of tightening booty meat, crushed again and again as the suction pulled you deeper then her dildo could ever reach.

Jane moaned in a low animalistic howl as she came with her ass, feeling the surging pleasure shoot up inside her. Her asshole squeezed around the fake dick as tight as possible, pulsating as her loins shivered in delight. A spray of juices erupted from her pussy, staining her sheets, but she was in so much bliss that she didn’t care. Deep inside her contracting butt, a small tingle and warmth was sinking deeper. Jane held on to that feeling and focused on it as she came, imagining the small sensation was your cum shooting up her colon. Whatever it was, it felt wonderful, and her bowels continued to squeeze it until her orgasm ended.

The girl needed a few minutes to cool off, she hadn’t cum that hard in a long time. As she pulled the thick dildo out her ass she noticed a few tiny strings attached to the base. She assumed they were just loose threads from her bedding, because what else could they be?

“Hah… that felt really good tonight... “ she panted, catching her breath “I wonder if it was because I was imagining doing it with Mike. Either way, I'm all tired out now. Better get some rest.”

Jane did some cleanup and then turned off the lights. As she nestled snugly into her bed she thought about her sister's brother and how sexy he was. The girl was totally oblivious that she had just rammed him deep into her ass, and he was currently suffering inside her bowels.

You could barely move. Jane's huge walls had compressed into you on all sides, hugging with a terribly snug and sticky embrace. The path in front of your face was blocked off by her numerous tight bands of muscles. They contracted so small that in the darkness you couldn't even feel the direction towards her exit anymore, it was just a lumpy prison of meat. Your body was being held in place, like a piece of shit, and wouldn't be allowed to move until her body wanted you too. The heat and odor inside was miserable. You were already exhausted, but now the heat of her bowels was actively sucking the life out of you.

Jane snoozed comfortably in her feather pillow, meanwhile you despaired deep inside the gurgling of her anal muscles. You were way too far up her ass to force your way out, you could barely keep yourself conscious within her atrocious cocoon of pulsating flesh. Hours went by and the smell got worse, Jane let out several roaring farts during her sleep, but her bowels were keen to keep you clutched inside while they pushed out the abominable stench.

You started to hyperventilate as you realized she wasn't going to save you. No one was coming to help, there was no way anybody would know you were here. The oxygen grew more and more thin, the wafting miasma of Jane's shit ate away at your lungs. You felt dizzy and scared, until finally a large croaking noise lurched towards your feet. You couldn't see the oncoming mass in the darkness, but you could feel its weight, and it was gigantic.

----

Jane woke up the next day feeling great. She got a full night's sleep and had a very pleasant dream full of romance and fun. As she got up a couple of pre-dump farts exited her butt, prompting her to visit the toilet. Her asshole expelled all the built-up shit at once, making big splashes as her payload fell into the toilet. Somewhere in that mess was your tiny body, suffocated and crushed under the mass of Jane's stool.

She wiped and flushed, feeling extra satisfied. Just touching her asshole with the toilet paper reminded her of the fun she had last night, and her wild fantasies involving Mike.

“I think I should text him later… without telling Chelsea. I know she’d probably get upset but maybe I can try going out with him without her finding out. Then he can plow my ass for real, hee hee!” Jane giggled.

Down between her big butt cheeks her asshole clenched shut, satisfied after letting go of a delicious meal.