Sandy had to admit, life under the sea was certainly not what she was expecting before she arrived. She moved to Bikini Bottom with the hopes of learning about basic marine biology, seeing how they lived & thrived under the sea.

It was for the good of science, of course. Getting a front-row experience with how they lived under the brilliant briny blue would provide an incomparable experience, compared to what she could learn from the surface.

What she hadn't counted on, however, was the... Eccentricity of the townsfolk.

Sure, she was a talking squirrel who had to wear a specialised suit to explore the depths of the ocean, but that was hardly worth questioning. Not compared to the amazements she had learned from her first few days in her new tree dome.

And how she managed to get that entire dome down there was quite the story... For another author.

Ever since she met Spongebob, and subsequently Patrick, her research had taken a sharp turn into the realm of the strange. Though that necessarily wasn't a bad thing.

It would've been hard to believe that there was a pineapple that served as a house, a pair of rivalling fast food restaurants, a school to learn how to (somehow) drive boats underwater, even a beach. An underwater beach.

The bright minds back in the Texas labs were never going to believe this, but they knew that Sandy Cheeks was no liar. As long as she could back up her claims & theories, which she was sure she'd be able to at least-

"Rrreeeeeeiiiiggggggghhhhhh!"

Whatever that noise was, it piqued Sandy's interest enough to pry herself away from her contraption on her little workbench.

She made her way over to the window and looked at what was on the other side of the glass dome, to which she was met with an amazing sight.

There, planted on the other side of the round barrier, was another sea creature that she hadn't yet encountered during her time here.

A seahorse.

It was incredible to see this close, and for a few reasons. The bright green colors were eye-catching to begin with, but it was the size of the thing she was really impressed with.

Unless her eyes were playing tricks on her from this distance, this marine mare looked to be as tall as she was. That was an oddity in itself, since as far as she knew, seahorses were meant to be as small as plankton... Who was one of the few that Sandy wished she HADN'T met.

"Neeeeigh!" The beast whinnied again, pressing its face into the glass of the dome.

"Whoa, Nelly!" Sandy exclaimed, pushing herself away from the window ledge & grabbing something from the bench, before making her way downstairs.

She had to get a better look at the undersea equine. If what her books said was true, and they were indeed as small as she had believed, then this was quite the scientific anomaly.

Seconds later, she was outside on the grassy terrain, approaching the beast with a level of caution. While the glass was thick enough to resist the ocean's powerful pressure, she couldn't afford to take risks. Not until she knew what else was down here.

Thankfully, she was careful enough not to scare the animal away; it just kept pressing its head against the glass, looking like it was trying to achieve something out of it.

And when she saw where its eyes were looking at, she understood why.

The soft, inviting synthetic grass that the inside of her tree dome was layered with must've looked too appetising to this beautiful creature, and the fact that this kind of invisible barricade was keeping it from sampling it must've been torture for her.

"Aww, ya poor critter." The Texan squirrel cooed with a smile, resting her hand against the glass. "Ya wanna come inside fer a snack?"

The seahorse took notice of her and, appearing to understand her, nodded at her with a sad expression.

"Don't ya worry, partner." Sandy smiled, motioning her hand to instruct the animal, still holding something in her other hand. "Come 'round here. If this works, ah'll have ya in here, happy & fed like a hog at a buffet."

The beast clearly didn't know what this strange-looking creature was referring to, but if it meant satisfying her never-ending appetite, she'd happily follow her anywhere.

She was brought to some kind of blockade with a wheel-shaped handle attached to the middle of it. She didn't know what was happening, but she saw the steel thing spin & the metal thing moved, allowing her entry into this strange area.

It was some kind of little tunnel, made of this invisible barrier as well, with some kind of hole in the middle of the floor.

But it didn't have the chance to wonder about it, before something red lit up & a scary noise blared.

"Waaaaaaarrrrrnnnngggg!" The seahorse blared as the sound scared it, flailing about the tiny room.

It didn't even seem to notice as the water around her began draining into the hole, not until she could feel the dehydration.

Her panic grew even more, and before she knew it, the obstacle on the other side of this weird tunnel moved aside, allowing her to flop out helplessly onto the soft, green surface.

Though in her current state, food was the last thing on her mind; she dropped to the deck & was flopping like a fish.

It gasped for water to quench its body, only to find that it couldn't breathe anymore. It couldn't do anything now except gasp, hoping someone would help her.

Which was just what Sandy had in mind.

"Ah sure hope this works..." She told herself, tweaking the settings on the gun-shaped device she held in her hand, before pointing it at her guest. "Here goes nothin'..."

Pulling her finger, she fired the contraption at the sea-based beast, coating it in the yellow laser beam.

"Neeeeiiigh!" The creature whinnied loudly, feeling the energy surging through her, her whole body vibrating as the process began.

She could feel her body growing as it was lifted into the air, shifting & shaping about as it felt like 10,000,000 volts were running through her body.

Sandy had to squint her eyes from the blinding light, though she couldn't take them off of the process unfolding.

She needed to see this through. Or else... She was in big trouble.

Luckily, after a few more seconds, it looked like it had worked. The seahorse's form was growing to the shape of a real horse, a set of legs & hooves started bulging out, its tail was thinning and its head was growing.

It even seemed to be growing a mane that matched its fins' colors & the scales around its body was changing into groomed fur.

The transformation seemed to last a little longer than the squirrel had anticipated, but once it was over, the creature was now a horse. One she was used to riding, wrangling, herding & branding back in Texas... Except green.

It slowly dropped to its hooves on the grass, and the poor thing looked stunned by what had just happened to it.

But once the shock had worn off, its eyes were the first thing to move.

It looked itself over, noticing the changes in shape, texture and appearance, feeling them with its newly acquired legs.

Of course, that was a little tricky for the equine, and it found itself stumbling about a few times, getting used to its new form.

But Sandy was there to steady her, gently holding her hand onto its shoulder.

"Whoa, easy, girl." She insisted, seeming to have worked on its gender. "It's alright. Yer okay now."

Sure enough, the beast realised that she could breathe just as normally as she could under the water. Now that her gills had gone, she could finally get a lungful of air and appreciate how it tasted.

And she loved it.

"Whhhheeeyy!" She cried happily, trying to get itself back on its hooves, only to fall flat onto the grass again.

"Careful, now!" Sandy stated, trying to help her back up. "It ain't easy takin' yer first steps. Let me-"

But she cut herself off at the sound of happy munching coming from the animal's newly-shaped snout.

Sure enough, the former-seahorse was happily digging into the grass beneath her, fulfilling its main reason to come here in the first place.

"Well, ah'll be." The squirrel remarked, putting her hands on her hips. "Looks like yer happy here~"

A happy snort escaped her mouth in confirmation.

"So, does that mean yer gonna stick around?" She asked, stroking the side of her mane. "'Cause ah got plenty of food an' water fer ya to enjoy, if yer interested~"

After taking a gulp of her food, the animal managed to pull itself upright and looked at her new friend, nodding happily at the offer.

"Attagirl~" The squirrel remarked, holding up the device that had caused the whole thing. "First, ah just wanna run a test on-"

"Brrreigh!"

Seeing the contraption that caused that terrible shocking feeling to her had a negative effect on the four-legged animal, and her instincts caused her wind a leg back, before bucking the ray gun straight out of Sandy's hand.

"What in tarnation!?" The squirrel exclaimed, seeing the device fly out of her hand, straight into the glass of the dome, sending it hurling towards the side of her tree home. "Whoa, settle down, girl!"

But it was only about to get worse for her.

While trying to calm her guest, Sandy was unaware that the tip of the ray gun was facing in her direction, and the impact with the ground caused it to fire.

"Easy, easy!" The rodent insisted, placing a hand on the horse's rump to stop her jumping about. "Just sit down and let's- Whoa, Nelly!" 

Before she could realise what was going on, the laser hit her right in the butt, shocking her with its effects.

That was a new experience for her, she had to admit. But so was what came next.

The device's setting must've been changed before it fired, since it didn't do anything to change much of her biology like it had done to this creature. Instead, she felt her muscles thinning themselves out, losing the strength & power she was so used to.

"Sam Hill!" She exclaimed, feeling her body getting weaker by the second, until the laser ceased and she felt as weak as a leaf.

She tried to keep herself standing, but the loss of muscle and power in her body had affected her legs and she could hardly support herself.

She even had to grip onto the horse's back half to keep herself steady, but that was about to be an option she'd regret.

Seeming to take her new friend's advice, the horse began to push itself backwards & downwards, lowering its rump to the floor to sit down. After all, this soft green stuff felt nice on her hooves, so it must've been just as nice on her new backside.

Sandy, meanwhile, could only gasp as the pair of thicc green cheeks came falling her way, pushing her weakened body down to the floor with it.

"Uh-oh!" The rodent exclaimed, desperately trying to scamper away, but failed as badly as one would expect.

Suddenly, she found herself cushioning the mighty butt of her horse, pinning her down into the grass & trapping her in place beneath her.

"Mmmmph!" She screamed as she tried to get herself out of this predicament, only to find that she couldn't even budge an inch.

No matter how hard she pushed or pulled, the horse was just too heavy for her now. It was like she had no strength or muscle whatsoever, and her attempts to wriggle free were failing.

And to make things worse, said horse was feeling the opposite effect.

The soft fur that her squirrely friend was covered in was so comfortable on her rear end, and she felt all of her fear & anxiety melting away with the cosy sensation.

The only thing she wanted to do was wiggle her hindquarters around, feeling the delightful sensations that were hugging her butt. Her tail was even swishing in response to the good feelings, showing her approval.

She didn't even seem to notice that her friend was trying to push her away; it felt like she was trying to massage her, to get her even more comfortable.

And the only way she could thank her for this wonderful gesture, was with a little butt-nuzzle.

Sandy couldn't tell what the horse was thinking, since her face was buried between the two cheeks, but she could make a wild guess as to what it had been eating, if she cared about that.

With her face trapped & her vision blocked by the strong buttocks, all she could do was smell the little bit of air inside the musky crevasse, and it wasn't exactly a pleasing aroma.

Clearly, this wild thing was the only thing in Bikini Bottom that enjoyed whatever slop the Chum Bucket served, and she had the seat in the house for the experience.

She could feel her lungs beginning to burn as her air was starting to run low, and the pressure being put on her was making her weak, so she had no choice but to inhale it.

And again, the opposite effect was being had on her horsey subject; the breathing on her anus felt really nice, serving to out her further at ease.

"Weeeeiiiiggghhhhh~" She neighed happily, wiggling her behind even more, wanting to get her friend's face as close to her rear end as possible.

This whole experience turned out to be pretty nice; this sweet squirrel had allowed her into her home, gave her a new body, offered her this delicious green food, calmed her down as she was scared, and now she was letting her use her face as a comfy seat, along with giving her this nice feeling on her puffy sphincter.

She simply HAD to do something for her, and as her body would have it, she had just the thing.

Sandy could feel her heart drop when the horse's bowels began rumbling, and she knew what that meant.

She couldn't even shout for her to stop, as her face was still trapped beneath the weight of the creature's cheeks, and her lungs were so starved for oxygen.

'No...' She begged in her mind, closing her eyes in anticipation for what she dreaded was coming. 'Holy Jackrabbits in Alabama, no...'

But her pleas remained unheard.

Bbbbbbbbbbbbrrrrrrrrrrrrrrrrrrrrroooooooooooooooooooooorrrrrrrrrrrrrrrrrrpppppppppppppppppppp

A massive, bubbly fart was released from the beast's colon, filling her friend's face full of its vile odour.

Sandy's eyes widened as much as they burned, and her stomach churned at the putrid aroma. She wanted nothing more than to puke out the horrible scent, but her head was so light from the lack of air, it was all she could do to keep herself conscious.

It might not have been good air, but it was air. And it was the only thing she had left.

She couldn't believe it. The horse she had wanted to learn about was nothing more than an animal, just like the rest of the ones back home. And yet, here it was, sitting on her face & unleashing the contents of its bowels into her nostrils.

How was she going to explain this? How was ayone going to take her seriously again, when they heard about this? And most importantly to her, how was she going to get out of here!?

She couldn't even struggle; her body was so weak that she could hardly breathe, never mind actually try to fight this.

Ppppppppppprrrrrrrrrrrrrrraaaaaaaaaaaaaapppppppppppppppp

Another noxious blast was pushed through the horse's anus, blowing its foul gases into her poor captive's nose.

"Mmmmmmmmph!" Sandy exclaimed, feeling the burning in her nose and her brain grow hotter.

She was really starting to lose her mind. How could she have let this happen? All she wanted was a chance to meet a real seahorse and see how she could learn more about one, but instead she ended up as its seat as it ate her floor.

As such, it was carelessly munching away on the grass beneath her, enjoying its new meal as much as the one that her spongey friend had given her, before he released her, completely unaware of what was happening with her new host.

But it didn't want to leave her friend without more of her gifts.

Bbbbbbbbbrrrrrrrrrrrraaaaaaaaaappppppppppppp

And it did so again; a wet fart & stenchy puff was released into Sandy's face, to remind her of her situation. Not that she needed the reminder.

From Sandy's perspective, this whole thing couldn't get any worse... But it was hard to see anything, when your eyes were obstructed by a horse's fat butt.

On the outside, something else was about to make this situation even worse for her.

The device that had backfired on her was still where it was and ready to fire again. All it needed was a little force, and it was about to get it.

One of the acorns on Sandy's tree suddenly fell from its branch, and as misfortune would have it, landed right on the ray gun's setting changer.

Suddenly, the dial turned & the display above the handle changed again. First it was a picture of an arrow between a water drop & a rock when Sandy used it on her new friend, then to a picture of a deflating balloon, and now it resembled a pair of lips.

And its next function was about to be made clear, when the acorn that fell on it bounced off & hit the handle, pressing into it just enough to set it off.

Just like before, it hit Sandy squarely, this time on her arm that was sticking out of the horsey butt, and the effects on her body took place.

'What in the-!' She questioned internally, feeling her body shifting again, though only on her mouth. 'Oh no... Not that!'

Sure enough, her lips puckered and she felt them pushing themselves forwards to whatever they could crash into. Which, to her further display, was the equine's big, meaty butt.

"MmmmmmMMMMMMMMPPPPPPPHHHHH!" She cried, feeling her face forcing itself closer & closer to her rear, until contact was made.

Against her will, she was suddenly kissing the anus of the beast, her lips pushing right into the puffy sphincter & giving it a nice, wet smooch.

Of course, this sent a shock through the horse, an even though it wasn't the kind that scared her like before, it caused a reaction.

Feeling the sudden feeling of the kiss was enough to make her lift herself upwards from the shock of it, breifly giving Sandy a glimmer of hope, as well as a lungful of fresh air.

Though she hardly had the chance to enjoy it, for three reasons.

One, the end of the horse's hind legs were still keeping her trapped in place, so she couldn't really go anywhere.

Two, the effects of the gun were still forcing her to kiss whatever her lips could reach, meaning she could only breath in through her nose, which was much less than what her mouth would allow.

And three, as a scientist, she was very familiar with physics & its proven theories. Including the famous one: what goes up, must come down.

Sure enough, once the initial shock wore off, the butt came crashing back down on her face, leaving her ample bracing time for feeling the impact for the second time.

And when it did crash down, it was with the same level of force.

"Mmmmmmmmph!" Sandy exclaimed again, feeling a good portion of the air in her lungs getting forced out of her body from the heavy load falling on her again.

Alas, she couldn't catch a break; the ray's effects had her lips attached to the horse's ponut, and there was nothing she could do to separate them, so all she could do was smooch & slurp away at the pucker.

Peppering the musky butthole with quick kisses, the rodent was tortured with the foul taste & smell that were attacking her senses, and her eyes were watering from the horrid stench & flavor.

The happy grunts coming from the green animal showed that she was having a good time, at the very least.

Her friend must've been having a wonderful time as well; she was kissing her rear end with such vigor, clearly out of love & appreciation for this kind of treatement.

So, who was she to deny her what she was obviously loving?

"Hee-hawwww~" The beast neighed, pushing her rump further down ontp the squirrel's face, hoping to give her an even better experience.

It wasn't too difficult for her to achieve that.

BBBBBBBBBBRRRRRRRRRRRRROOOOOOOOOOOOOOORRRRRRRRRRRRRRRRRPPPPPPPPPPPPP

"Mmmmmmmmhmmhmmhmmhmmmmph!" Sandy cried, feeling another wet fart being blown into her face, this time getting into her mouth.

She wanted nothing more than to scream and push the anus away, but her body was just too weak to resist, and the horse was too heavy.

Furthermore, the secondary effects of this property of the ray kicked in; once the recipient of the kisses opened their mouth, or pucker, in this case, it forced them to get more intimate.

To her horror, once the anus opened up to unleash the huge fart, her tongue quickly wormed its way out of her mouth & pressed itself against the beast's hole, giving it a sloppy rimming.

"Mmmmmm! Mmmmmmmph! MMMMMMMMPPPHHH, MMMMMMMMMPPPPPHHHHHH!" The rodent wailed, still muffled by the anus on her lips.

But her cries fell upon deaf ears.

"Wwwhhhhhhhhhhhaaaaaaaaaaayyyyyyyyyyyyy~!"

The horse was having the time of her life. She couldn't remember the last time she'd had a treatment like this, if ever, and she had no idea why it felt this good.

But one thing was for sure; she was taking up her new friend's offer to stay here. She invited her too, after all.

She would gladly take her offer for free food, water & this kind of affection.

Besides, if she was getting this personal with her, then she must've been having just as much fun as she was, so there was no need to worry.

She'd stay as long as her host liked, and judging by the amount of times she had kissed & licked her butthole, it must've been quite a while.

And naturally, this only meant that she was hungry for more of her ass gas.

PPPPPPPPPPPPRRRRRRRRRRRRRRRRRRRRAAAAAAAAAAAAAAAAAAAPPPPPPPPPPPPPPPPPPPP

Sandy's cries of desperation fell upon deaf ears again, as her friend's rectum blew another long, wet & smelly fart into her mouth, making her choke on the stench.

She wanted to do something, ANYTHING, to make this stop. But she couldn't.

The only thing that could help her was the one thing she was currently unable to control: the ray gun.

But it looked like it had other plans for her.

As if the universe was conspiring against her, another acorn fell from the tree & landed on the dial, this time changing the settings to show a picture of an outline of Plankton, who was known for one thing besides his evil mind:

His size.

Just like the previous one, the acorn fell on the handle after hitting the dial, firing the ray right at the rodent.

For the third time, the science beam made contact with Sandy's body, coating her with the yellow light.

The horse felt something shift and change below the back half of her body, but didn't mind too much, since her anus was still getting kissed by the sweet squirrel. That felt too nice on her rear, as much as the taste of this green stuff did in her mouth.

As such, she stayed oblivious to the face that her friend was undergoing some changes again. This time, it affected her whole body, though it was a slow process.

"Nnngggggghhhh..." The poor rodent groaned, feeling her whole body shrinking, little by little.

It was next to nothing at first, just a weird tingling feeling that left Sandy wondering how this whole thing could possibly get any worse than it had already been.

After all, it was doubtful to get any lower than kissing a horse's stinky butthole, post being sat on by the former sea-based creature.

But sure enough, that was exactly what was happening.

Within seconds, she was no longer as tall as her equine guest. In fact, it seemed like the beast was getting bigger by the second.

No, that couldn't be right. It was her, she realised. She was shrinking.

Before she knew it, her body began rescinding in size, leaving her smaller than usual, but still trapped under her rear end.

Though not everything about her changed with the shrinking, as there was something that remained the same size: her clothes.

Her bikini top & bottom were the only things not affected, resulting in leaving her completely exposed, but that was hardly her biggest concern.

Thankfully, this came with the benefit of having the immense pressure that was being put on her lessened a little, as the equine's behind was lifted a few inches off of her face.

But not high enough for her to pull away, unfortunately. And even more unfortunate in that regard, the previous effect was still lingering.

Even as her body was becoming "free" again, in the loosest possible term, her lips didn't catch the memo.

As soon as her tongue was removed from the horse's ponut, thanks to the help of gravity, the squirrel found herself forced back onto her weakened feet, bringing about a strange pain to her legs.

But she was no stranger to pain, at this point. Either physically or mentally.

Once she was back up, she felt her arms raise themselves up like a child reaching out to the mother, and her lips pushed themselves towards the musky anus, puckering up for a big, sloppy kiss.

"Mmmmph! Mmmmmmph!" She screamed, not wishing to feel her wet lips making out with the puffy sphincter again, nor having the foul taste & smell invade her taste buds & nose any more.

The horse was none the wiser to her displeasure; all she knew was that her friend had stopped her loving affection on her rump hole.

It felt too good to stop now, so she decided to ask her furry seat for more fun.

"He-hawwww..." She whinnied, pressing her anus down on the squirrel, hoping to encourage her.

And it worked.

With her head pushed against the grass by the horse's massive rump, and her arms reaching out for the rim of her rim, the rodent grabbed onto the anus & gave it a firm grip, to the delight of her partner.

"Weiiiggghhhh~" She moaned, surprised by the little hold on her butthole, but not complaining about it.

And it got even better when she felt her friend pull herself up, pressing her face into the dirty orifice, and planting a series of kisses all around the surface.

"Wheeee-snaaaaaaaaw~"

It was clear that her friend had taken her wordless advice, and was now continuing where they left off, with no intentions of stopping anytime soon.

In fact, things were about to get deeper... Literally.

Sandy was disgusted with what was happening to her, and how she couldn't stop it. But the worst part was yet to come.

Once her lips pressed firmly against the horse's anus, her eyes widened and a chill ran down her spine, as the pucker opened itself up.

And in a show that argued with science, she felt something pulling her head inside the hole, like a snake devouring its prey.

"Mmmmmph!" Sandy cried, trying to push herself out, but failing miserably.

Whether she liked it or not, she was getting forced into the anus, and her only view was the darkness of the horse's bowels.

And it was not a pretty sight, nor smell.

Not only was it dark, but there was an overpowering stench coming from her intestines, and her nostrils were being flooded with the noxious aroma.

And the heat that was coming from within the anus wasn't pleasant, either. If the smell wasn't enough to burn her nose, the hot temperatures certainly did the job, and it was starting to roast her alive.

Sandy's lower half was left outside of the anal passage, but that didn't do her much good in this state.

Now, not only had she been smothered by her new friend's massive backside, but she was also being smothered INSIDE it.

And her equine subject didn't even seem to care. If anything, she was probably helping her get inside her dirty canal, if that was possible.

She was having the time of her life, feeling the wonderful sensations in her anus. And when she felt her little friend's head going inside, she just had to give her a nice treat.

Pppppppppppppprrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrbbbbbbbbbbbbbbbbbbbbbbbbbbbbbtttttttttttttttttttttttttttt

The most disgusting, bubbly, fart to be produced yet was unleashed into Sandy's face, and her body had nowhere to run.

"Mmmmmmmmmmmmmpppppppphhhhhhhh!" She cried out, still unable to scream from her lips still seeking another kiss from whatever her mouth could find.

And within seconds, her face was planted firmly against the anal flooring, leaving her no option but to give it a series of smooches, and breathe in the horrid air surrounding it.

"Wwwwwweeeeeeiiiiggghhhhhh~" Her companion cooed, wiggling her butt around in place, giving her host the full experience.

Her bowels were churning like a thunderstorm, ready to release another foul-smelling maelstrom.

Snady knew what this meant.

BBBBBBBBBBBBBBBBBBRRRRRRRRRRRRRRRRRROOOOOOOOOOOOOOORRRRRRRRRRRRRRRRRRRBBBBBBBBBBBBBBBBB

"MMMMMMMMMMPPPPPPPPPHHHHHHH!"

Another powerful fart was blown into the rodent, coating her with its horrid taste & stench.

This was too much for the Texan.

She was covered in filth, sweat, anus musk, farts and the worst smells known to squirrel. Her entire body was exhausted from her struggle and the lack of oxygen.

Her arms were aching from pulling herself inside and her legs felt like jelly, resting helplessly on the floor as she continued to kiss the fleshy surface.

It was all too much. Her eyes were closing, her lungs were burning and her head was spinning, and the world around her was becoming blurry.

She couldn't think. She couldn't move. She could barely even breath, anymore.

All she could do was close her eyes, and accept the inevitable.

She wasn't going to make it.

PPPPPPPPPRRRRRRRRRRRRRRAAAAAAAAAAAAAAAAPPPPPPPPPPPPPPPPPPP

Even as the next burst of foul wind washed over her helpless body again, she didn't even try to protest. There was no point anymore.

Sandy Cheeks, as she knew her, was gone.

"Weiiggghhhh~"

Meanwhile, the horse neighed, wiggling her butt a little more.

That amazing slurping feeling her backdoor was experienced was simply heavenly, and she had to keep her friend close.

So, with a happy gaze, and moreso because she was nearly out of food from this spot, she stood up on her hooves and turned around to thank her new best friend.

However, she was quite surprised to see that the furry thing wasn't there anymore. Just that cuppy pair thing on the ropes & that green cloth with the purple thing round it.

"Weeiiigghhh?" She called, looking around.

Sure enough, her friend was nowhere to be found, and she had no idea what happened.

All she could do was look at the large green patch in front of her, only to find that she still wasn't there.

Deciding on the next best thing, she leaned her head down and pointed her snout at the latter object, taking a deep sniff.

The scent was invigorating, and not too bad. Not too bad at all.

In fact, it was kind of nice.

It was almost like a treat.

Without hesitation, she nudged the piece of clothing with her mouth to unfold it a bit, allowing her a better view of what her furry friend's butt was being hugged by.

Then, without hesitation, she shoved her snout inside, pressing the tip right into the crevasse.

It smelled really good, and her new taste buds were already tingling for a better sample.

So she decided to treat herself with just that.

Letting her tongue hang out of her mouth, she let her long muscle run across the surface, sampling the wonderful flavour.

"Neeeeiiiiggggghhhhh~" She exclaimed in delight, going back in for another sample.

Before she knew it, her whole snout was buried in the bikini bottom, and her mouth was happily tasting the salty juices.

"Weiigh! Weiigh!" She whinnied, lapping her tongue harder against the spot Sandy's ass had been pressed into, wanting to sample as much of it as she could.

Suddenly, she understood what her friend found so appealing about eating someone else's butt, and it made her wish she could've kept going with her.

But it didn't seem like that would be possible, since her new furry friend had disappeared.

Still, that didn't mean she couldn't still enjoy herself.

The scent & flavor of rodent rump remnants was putting her in a funny-feeling mood, with a burning need building up on her private hole.

The one just below where her friend was still buried inside.

With that in mind, the beast pulled her snout away from the moist spot, looking for a way to relieve the pressure that was building up inside her marehood.

This was a great feeling, but she knew it would feel even better with some action.

Looking around her, she tried to find something, anything, that would help her satisfy her lust.

And then, her eyes locked onto something that looked good enough to serve her purpose.

Standing at one part of the glass dome, stood a giant wheel used for exercise for animals like her, and besides that was something that paired nicely with it.

A large water bottle that was modelled like the ones used for small pet cages, with a narrow but thick dispenser leading out of it.

That's when a lightbulb went off.

If that big, metal rod was strong enough to support who-knows-how-many gallons of water, even if it was empty now, it only stood to reason that it could support her wait.

Only one way to find out.

Trotting over to the tube, the beast wasted no time in turning around & hoisting her hindquarters up to the drink dispenser, ready for the fun that would follow.

"Neeeigh~" She cooed excitedly, pushing herself backwards.

Just as she planned, the long metal spout impaled her private region, forcing the tip into the depths of her marehole, and causing her to moan.

"Wwwwhhhhaaaaaaaayyyyyy~"

The horse was enjoying this so far, and she was ready to go all the way with it.

With her legs still supporting her rear end, she leaned herself even more backwards and began pushing herself further onto the spout, letting the cold metal invade her, inch by inch.

It was only when she felt it go as far back as it would go that she realised how far the rod actually was, and the realisation excited her further.

This feeling was incredible, and she couldn't wait to feel it again.

So, she pulled herself forwards and back, slowly at first, but quickly gaining pace.

Within seconds, she was pounding herself up & down on the spout, fucking herself with it, and loving every minute.

"Nnnnaaaaaayyyy~" She moaned, slamming her ass back & forth on the rod, letting the slick, metal surface fill her up.

As the mare fucked herself, Sandy came only guess what this rocking feeling around her was. But she didn't care much about that, nor anything else.

The only thing she could make sense of was the taste & scent of the horse's backside. It was the only thing that remained in her brain.

She was lost, and she had accepted it.

Even with the constant shaking frontwards and backwards, the ray's effects forced her to continue kissing the anus interior, and there was nothing she could do.

All she could do was smooch whatever she could, and savor the foul flavor & smell.

That was her world now.

BBBBBBBBBBBBBBBBBBBRRRRRRRRRRRRRRRRRRRRPPPPPPPPPPPPPPPPPTTTTTTTTTTTTTTTTT

Even as another loud, wet fart was released from the depths, blowing its gas into Sandy's fur, the rodent didn't even protest.

She was completely broken.

"Wheeiiiggghhhh!"

On the outside, her friend was basking in the incredible feeling of fucking herself with the drink spout.

With every movement of her buttocks, her insides were being stretched by the sturdy metal, giving her a pleasure she had never gotten to experience.

Her whole body was trembling, and her eyes were rolling back from the overwhelming bliss.

The more she kept fucking herself, the more she could feel her insides beginning to clench around the intruder, like a desperate lover.

Sandy was feeling that too, but like the farts, it made no difference to her. Even if she was crushed to bits inside the dirty insides of this horse's rectum region, it wouldn't have been any worse of a fate than she had already suffered.

"Mmmmmmmmmmph..."

All she could do was moan into the anus surface, and even that was pointless now.

Without an incentive to stop, the green beast continued to bounce her fat buttocks on the rod, filling herself with the metal, and bringing her closer & closer to the edge.

Her body was getting hotter and sweatier, and her heart was racing faster.

Feeling that incredible feeling building up even more, she picked up the pace like she was on the track, and her moans were coming faster.

"Whhaaaaaaah! Neeeiiiiiih! Whhhaaaaaaah!"

She was reaching her peak. And it wasn't going to be a pretty sight, for anyone lucky enough to be standing behind her. Which, given that all she was surrounded by was clear glass, wasn't an impossible possibility.

Not that she cared. All she wanted now was to make a hot, sticky finish.

With that thought in mind, and with her viginal walls clenching around the spout, the horse gave her final, hardest thrusts, pounding herself hard and fast.

Her insides were stretching beyond belief, and the heat inside her cunt was boiling. Though the former was more than could be said for her anal passage.

As her friend was getting closer to the climax, Sandy could feel her walls clenching around her. If her mind was still working, it would've reminded her of the time she wrangled with an anaconda.

But it didn't matter. Whether she lived or died, all that mattered now was her friend getting satisfied.

"WWWWWWWHHHHHHHHHAAAAAAAAAAIIIIIIIIIIIHHHHHHHHHH~"

Suddenly, the horse let out a mighty whine, feeling the tension in her vagina explode like a burst dam.

On cue, her private area unleashed its pent-up fluids, gushing like a waterfall and coating the spout & floor below in her love juices.

It wasn't much of a surprise to Sandy, as the mare's rectal walls were squeezing the life out of her.

It was almost enough to bring her out of her dazed state. Almost.

Her bones were being crushed, her skin was being compressed, and her face was getting smushed.

Even if her mind was still functioning, there was nothing she could do to fight the inevitable.

All she could do was endure impact & aftermath.

"Hhhoooooooooooh~" The green beast neighed, releasing a satisfied sigh.

Her orgasm was so intense that her body went numb, slowly sliding off the metal rod.

As her body was overcome with the euphoric feeling, the horse felt her legs give out from the powerful sensation, and they fell limp, causing her to slump to the ground with heavy breaths.

She felt so good, but so tired. And after her big meal and all that "exercise," she was starting to fall asleep.

Not before thanking her host, though. Whether she knew it or not.

Ppppprrrrrrrrooooooorrrrrrrrrppppppp

A loud, wet fart was blown right onto the sleeping squirrel, filling her face with the musky smell of her anus.

But she didn't complain. As a matter of fact, she didn't do anything.

Just like the mare she was stuck inside, Sandy felt her mind shutting down from the lack of oxygen, and her body was too tired to care.

Her last few seconds of consciousness was spent in the dark, and she couldn't tell if her eyes were open or not.

She could only feel the darkness surrounding her, and the horrible stench of the bowels she was trapped in.

If nothing else, this would teach her not to mix science with nature.