Exploring Deep Caverns

The cave reverberated as Miner Pony’s pick struck rock. The loud, piercing cracks rang out time and time again, until the difficult stone finally gave way. Miner Pony’s lips crept into a smug grin as the rocks gave up their secrets, exposing beautiful crystals and gemstones. The light of her head-torch danced over them, creating a wonderful rainbow light show. Miner leaned down, carefully depositing each gem into her saddlebag.

Miner Pony felt at home down there, and everypony knew it. Heck, they all called her Miner Pony. If that wasn't proof enough everypony knew, what would be? Sure, Miner Pony could have been a not so subtle dig at her slight frame and height, but who could say? Miner had enjoyed digging and spelunking since she was a filly. Not a day seemed to go by that she wasn't deep in some cave network, working her hooves to the bone. Partly because she made a small fortune selling the gems topside, but also because things felt right underground. There were no worries, no arguments, no troubles. The monotony of day to day Equestrian life melted away underground, morphing into one seamless adventure.

Miner Pony stopped and took a deep breath as she placed the last gem in her saddlebag. Fishing through the other she found a large flask of water, knocking back half the contents in a single go. She couldn't help but giggle to herself as she belched, the crass sound echoing off into the distance. There was nopony else down here to hear it, so why try and cover up? As she returned the flask to its home, her headlamp flickered slightly. Rolling her eyes, Miner removed the protective helmet upon which the light was fitted, and delivered a hard wallop to the side. One quick act of violence was all that was needed, as the light shortly returned to normal. Only being an earth pony, Miner couldn't really take advantage of those fancy-shmancy magic charged torches, so a conventional battery powered one had to do her. A battery powered one that clearly needed replacing. She would have taken that omen as a cue to leave, but something caught her eye, off in the distance.

Affixing her saddlebags to her sides, she headed off in the direction of an odd, inviting glow up ahead. It was rather dull, and only at hoof-level, but curiosity had gotten the best of her. With each step the light grew larger and brighter, but remained at ground height. It was only when Miner Pony was practically stood in the light that she veered to a halt.

The light was in fact coming from below. Miner Pony was stood on a lip of rock, overlooking a large descent. The open cavern was pretty big, easily as large as an average country house - if not a little larger. And the source of the glow - well now. Lining the bottom of the cavern were vast swathes of gems and crystals. Hundreds, easily. Now, Miner Pony would normally have been cautious around such large descents. The main reason she'd been in the profession so long was she'd been wise enough to know when to pull back. Some situations were too dangerous to risk, no matter the bounty.

But she'd never seen a bounty like this before.

The size of the haul was simply too big to surrender. She checked her saddlebags for remaining space, and was glad to see that alongside her kit bag and subsequent loot, she easily had half a bags-worth of space. Nowhere near enough to clean the place out, but she'd just have to come back for the rest another day. She didn't need to worry about somepony else stealing her riches - nopony else was brave enough to explore these caverns like her.

Flicking open her kit bag with her snout, Miner Pony searched for her climbing equipment. Rope, check. Claw-hook, check. Carabiners, check. Rearing onto her hind legs, Miner Pony attached the carabiner to the strap of her saddlebags (which looped round her torso, allowing them to stay firmly attached while spelunking like this), before also attaching it to the rope. She then tied the end of the rope to the hook, before searching for something sturdy to secure it to. A few paces away from the abyss stood a sturdy looking outcrop of rocks, with several gnarly gashes across them - reminiscent of claw marks. Miner Pony wedged the end of the hook into the cracks, before giving the rope several experimental tugs to test the strength of the hold. Satisfied, she shimmied over to the edge of the lip, before beginning the slow descent to the floor.

It felt like quite a long while before Miner Pony’s hooves made contact with a solid surface. In reality it can't have been more than a minute of slow descent, but time seemed to creep along in the maw-like darkness. Her head torch could only pierce so far, before being rapidly swallowed by the encroaching black. Eventually her hooves settled against the damp, cold floor of the cavern. The world above rapidly faded into blackness, but the floor around her glowed invitingly. Spinning on her heels, Miner turned to face the swathes of gemstones teasingly exposed behind her. Now she was down amongst them she could barely contain her excitement. The enticing stones drew her forwards, her pick wobbling slightly between her teeth. Stopping beside a particularly alluring purple gem, Miner raised her head, the pick in tow, before arcing it downwards again. The sharp tip walloped into the rock in which the gem was embedded - teasing cracks shooting out in all directions. Back she reared, before striking downwards again. Back and forth, faster and faster. The cavern echoed like an opera hall as she worked, the high pitched dinging of the pickax a song to her ears.

Suddenly the gem tumbled to the floor, coming to rest at her hooves. Bending down, Miner Pony lowered her head to the floor, grabbing the gem in her teeth.

Her head darted upwards as she heard a noise behind her back. The rustling of loose stones, as if something had moved behind her. She span round, her headlamp slicing through the darkness. Nothing. A gust of wind must have aggravated some long untouched sediment somewhere close by. Taking a breath, she returned to the job at hoof. She dropped the gem into her saddlebag, before clenching the pick handle in her teeth again. Down in crashed, this time working to free a gaggle of red and green stones. The sound of rustling again.

A large, heavy thing darted out of the milky blackness behind her, wrapping around her chest. Miner Pony screamed, spinning around to the best of her ability to free herself. Her headlamp sliced through the darkness again, this time stopping on the face of a huge, angry dog. A Diamond Dog.

Shit.

Miner Pony struggled desperately, before resigning herself to fighting back. She swung her head towards her aggressor to the best of her ability, the pick striking it’s torso. She’d intended to pierce the attackers chest with the impromptu weapon, giving her considerable time to escape. In actuality, however, she’d only managed to whack him with the blunt edge. Regardless, the Diamond Dog reeled backwards, releasing Miner Pony from its grasp. The dog was stood between her and the escape rope, so Miner had no choice but to retreat deeper into the cave. There was no way she could best such a muscular beast in a one-on-one fight, even with the pickax.

Miner fumbled with her headlamp, gulping as she managed to power it down. Trying to hide with a piercing light on top of her head was not going to end well. With little other choice, she’d have to guide herself by the faint glow that the magical gems gave off. This deep underground, there was no hint of the sunlight. She found herself missing it’s warm touch as she trudged deeper into the cold. Miner moved quietly, her ears pricked as she listened for the sounds of her stalker. As big as Diamond Dogs were, they moved quiet as mice.

Just a short distance before her, Miner Pony could make out a little gap in the wall of the cavern. It wasn’t much, but it would probably be enough for a little pony like her to squeeze into. Tucking herself inside, she couldn’t help but mewl in shock slightly as her tail caught in an outcrop of stone. She had to admit to herself, this was a pretty crummy plan. But to be honest, it was all she had. Hide there for a few hours, wait for the Diamond Dog to give up searching. Then, return to the antechamber where she’d abseiled down. She’d have to leave her saddlebags behind, they’d come loose as she fought to escape the dog’s clutches. Considering the scenario, however, she didn’t feel much desire to fritter time away trying to find them.

Time passed.

Miner Pony couldn’t possibly know how much, what with the murky dark surrounding her.

By the time she chose to make a break for the exit, how long had slipped by? Minutes, or hours?

Shuffling out of the gap, she hopped to her hooves and ran. Suddenly drowned with uncertainty, Miner Pony flicked her headlamp back on. She had to be certain she wasn’t running deeper into the maze of rock. Sure enough, there up ahead was her rope. And there - no more than ten paces away - were her saddlebags. They were right there.

“You shouldn’t be doing this!” Miner thought to herself as she diverted from the rope. But with the sheer number of gems in those bags, she wouldn’t have to worry about coming back down into the caves for quite some time. Dipping her head, she opened her mouth to grip the strap of the bags.

Suddenly, her muzzle was enveloped in the soft, warm fur of a paw. Miner’s eyes widened as she realized what was happening. The muscular arm held her tight - so tight, in fact, that there was no chance of escape this time. The other paw swooped in, grabbing Miner around the waist.

“Hrmf!!??” Miner yelped as the beast spun her round on the spot, stopping her as she faced him. Being held firmly in place with her headlamp bright, she only now got a proper look at the beast.

A huge matted mess of hair, this Diamond Dog was reminiscent of an Old Equestrian Sheepdog. Two huge ears hung forlornly on either side of it’s head, and a thick fringe entirely covered its eyes. Out from the mess stuck its muzzle, a large rubbery black nose snuffling at her. Several thick, globular trails of saliva hung from its mouth, shaking loose as it heaved with each breath. The hair of it’s massive body was shorter, but still long and wayward by anypony’s account. Looking the animal up and down, Miner Pony gulped as she realized just how big it was. Perched on its hind legs, the dog easily stood four times the height she did, and just one of his paws was easily able to wrap itself entirely around her torso, as it had done.

Miner Pony stood still, terrified of what the beast would do to her. She knew Diamond Dogs were hugely territorial, but she’d always managed to sneak round them the few times she'd encountered them before, so she had no idea what would happen if one were to catch you. Gulping, she quickly guessed at an answer as the creature's mouth slowly hinged open, exposing rows of gnarled, dirty fangs. So this was it, was it? This was how it all would end, getting eaten by a feral Diamond Dog deep beneath Equestria? She screwed her eyes tight as the dog’s muzzle pressed against her own…

...Only to throw them open again as she felt something push against her own gritted teeth. Glancing down, she gasped with shock at the sensations of the dog’s tongue forcing her teeth apart. And in taking that gasp, she’d helped the process along nicely. As her teeth parted slightly, the Diamond Dog thrust it’s tongue deep into her mouth, grasping Miner Pony to it’s own body in a vice-like grip.

The rounded tip rested still inside her mouth for a moment, but then Miner could feel it start to probe deeper. Pushing past her tonsils, the hot, writhing piece of flesh worked down into her throat. Miner Pony gagged, choking slightly on the tongue and the thick, viscous saliva that coated it. The massive quantities of drool filled her mouth, mixing with her own. While the majority poured down into her throat, the remaining excess only had one place to go. The slight mare gagged and spluttered pathetically as her nostrils filled with the liquid, dripping from her nose like hideous trails of snot. The flow from her nose was near constant - running down her face, only to connect with the trails being ejected from the corners of her mouth. The fluids pooled on her chin, before being shaken free by her desperate convulsions, splattering messily over her coat. She thrashed about madly in it’s grip, bashing her hooves against its firm chest. There was nothing she could do though, the beast's grip was simply too strong. She could only sit there and take it as the hunk of flesh pushed deeper still.

The fiery muscle dragged along the walls of her throat, filling her so entirely she felt like she was going to choke. She certainly couldn’t breathe as the tongue wormed around inside her. Miner Pony could feel her chest itself beginning to grow hot; a sign of just how deep into her body the tip of the tongue had been thrust. She continued to smack against the Diamond Dog with her hoof, though her efforts grew weaker and fainter as she felt the energy slowly sapping from her. Tears were beginning to well in the corners of her wide eyes, struggling to focus on the furry face rammed up against her own. Her head torch continued to shine brightly, bathing the dog white. Miner Pony had considered blinding the dog and bolting in the ensuing chaos, but that was impossible. The dog’s heavy fringe hung over its eyes entirely, and she’d never be able to reach it and push it aside.

Resigned to her fate, she stopped smacking the beast’s torso. Her body started going limp,the thrashing muscle having blocked her airway for a little too long now. But then, in those last moments, a great relief. She could feel the intense heat in her throat residing, travelling back up from her chest, into her throat, into her mouth. The Diamond Dog pulled its head back, breaking the bond between the two. Miner Pony wrenched her mouth open as the tongue withdrew, gulping down great lung-fulls of air. The tongue stopped a few inches above Miner Pony’s open mouth, thick ropes of saliva and spittle running down it. As the Diamond Dog panted excitedly the drool was flicked all over Miner’s face, running into her eyes and back into her mouth. Much of that in her throat had come back up again too, leading to great rivers of the warm stuff flowing from her nostrils and mouth yet again. Her cheeks were soaked too, although much of it had already begun to dry into her fur. Among the sounds of her own heavy breathing, Miner Pony could make out the drip sounds of the excess splattering against the cold cave floor.

Hacking up the last of the excessive saliva, Miner Pony returned her focus to the beast. She had no clue what it wanted or needed, but hopefully that violent tonguing session was the extent of it. She felt the great grip of the Diamond Dog shift around her, its talons snaking around to envelop her whole chest. Slowly, it tightened its grip, Miner’s glazed eyes bulging slightly as her ribs creaked ominously. Miner Pony had to admit it to herself: she was resigning herself to the fear she’d never leave this cavern alive. She’d be suffocated and left to rot, or to be eaten. There was no way out. The light of her head-torch glinted of the dog’s menacingly sharp fangs as it breathed heavily, unmoving, except for its massive furred chest with every breath.

Without warning, the Diamond Dog pushed Miner down, slamming her backside against his thigh. Dragging her upward roughly, she felt something hard, hot, and slightly damp slap forcefully against her belly. Looking down, her eyes widened once she saw what it was; a huge, gnarled canine cock, fully erect and throbbing softly against her crotch and lower abdomen.

Oh fuck, she thought, her lips trembling as Miner’s clouded mind grasped at anything it could to deter the inevitable. “H-Hey now! Easy there, d-doggy!” She coughed, her comparatively frail body heaving as a thick glob of mixed spit dripped down onto her chest. Heaving another two heavy coughs, her eyes crossing and rolling back while her lips puckered and dripped with drool, legs shaking slightly against the beast’s burly belly. “Don’t wanna do--”

The unfortunate mare yelped as her body was suddenly jerked upwards. The terrifying cock slid off of her torso as she was pulled away, flopping downwards, bouncing slightly. Miner could feel her body being arced away from the Diamond Dog as it lifted her. Slowly it drew her upwards, until she rested on eye level with the beast. (Not that she could see it’s eyes, of course.)

The dog held her there for a few seconds, as if studying her. What was it thinking about? Miner Pony soon got her answer. She could feel air whistling past her ears as the dog swung her body downwards like a pendulum. Down she rocketed, before being shot through with excruciating pain as her rear was forcibly slammed into the Diamond Dog’s crotch. She felt her puckered asshole parting painfully fast, rapidly filling with the dog’s disgusting cock. Tears quickly welled up in the corners of her eyes as the discomfort filled her from head to hoof. Her rear felt warm, then hot, then wet. She couldn’t tell if that was the beast’s precum, or if the sudden violence had caused her to bleed.

Miner grunted mindlessly as the dirty dog dong slammed in and out of her anus, relentlessly pushing back and forth while the tapered tip dug deep into the walls of her rectum from the angle it was entering her at. Her jaw fell agape as she felt the top edges of the Diamond Dog’s obscenely wide knot grind at the soft, raw flesh of her tender ponut and abused flanks. The knot was so foul and distended, though, there wasn't a chance it could be forced inside.

The dog breathed heavy and loud, the hot air wafting down into Miner’s reddened face. The pungent aroma was easily enough to make one queasy, though Miner had grown ashamedly used to it by now.

The dog continued using her like a proverbial fleshlight, its paw wrapped tightly around her waist. With each thrust the pointed tip jutted into her, causing her abdomen to ache and bulge alarmingly. With the way the Diamond Dogs paw was positioned around her waist however, the beast was not content. His heavy paw would get in the way of the outward-bulging cockhead, meaning the deepest thrusts were impossible. The beast growled angrily to itself, before grabbing one of Miner Pony’s dangling hind legs in its free paw. Mid thrust he wrenched on her leg, spinning her body round so her legs dangled towards the floor. The little earth pony screwed her eyes shut and gritted her teeth again as the muscular cock dragged inside her ring, tugging painfully at her innards, before accidentally popping free. Once the dog had settled Miner Pony was no less pained, but instead she had other things to focus on.

The immense pressure around her waist lessened as the dog weakened its grip. Miner took a deep sigh of relief - the crushing tightness had left her fearful of vomiting. The paw suddenly began to move, travelling upwards from around her waist. It slowly coaxed its way around her throat, the second paw quick to follow. Her eyes bulged as they locked in place around her. Fortunately she was small, and those paws were big. So big, in fact, they could not fit comfortably around her neck. The base of the paws actually rested mostly over her shoulders, meaning she was still able to gulp down urgent breaths. Regardless, breathing was still far from easy. One claw of each paw pressed into her neck, digging deep against her. Comfortable in the way it now supported her weight, the Diamond Dog rubbed the tapered tip of its cock against her asshole again. It wasn’t trying to be slow or teasing, it was just making sure it was lined up, ready to go in hard. Satisfied, the dog drew back, slamming into her battered hole yet again.

Miner grunted as the fat dog cock slammed deeper and deeper into her back end with each thrust, seemingly more and more of the disgustingly overgrown knot at the bottom threatening to push its way inside with each movement. Her legs twitched and wriggled pathetically, uselessly, as her breathing grew quieter and quieter in the Diamond Dog’s grasp. His talon tightened for a moment against her, followed by a small pause with his knot pressed firmly against her widely-spread ponut, which lead Miner’s heart to skip in preparation for the oncoming orgasm. However, fate was not to be so kind to her, and instead she merely felt a few hot dribblings of what could only be pre spill inside her before the Diamond Dog began to pump away at her once more.

Every inch of her rectum was on fire as the hunk of flesh dragged against it. A fine mixture of drool and sweat had functioned as a life-saving lubricant, but it had all faded by now - evaporated in the heat and friction. Miner Pony was losing herself. The sheer explosive aggression of her captor had sent her body into overdrive, the fine tip careering into her abused hole over and over again. Her jaw had gone slack, resting atop the edge of the dog’s claws. Drool inched from the corners of her mouth, leaving her chin slick. The force of the beast’s thrusts shook her body like a leaf in a gale, the last of her energy draining from her. Her vision blurred slightly, the milky blackness of the cave creeping in.

Light from her headlamp danced across an exposed gem on the other side of the cave. It reminded her of sunlight dancing across water.

The claws at Miner’s throat suddenly withdrew, leaving her neck feeling oddly cold and exposed. The paws quickly followed suit, pulling away from her shoulders. With no support at all, Miner Pony yelped as she fell towards the floor. Her torso smacked down, her head immediately after. Her jaw connected painfully with the cold stone, the momentum catapulting her protective headgear aside. It spiraled through the air, smacking down a few paces away. The torch shattered, glass strewn all around. Darkness.

The Diamond Dog had dropped down onto all fours, allowing its prey to hit the ground too. Her head spinning, Miner slowly pushed her front two hooves against the stone, lifting herself up. However, her rear was still suspended in the air slightly, kept aloft by the stiff cock lodged inside her ass. The dog grunted, shifting its weight again. With one final, titanic effort, it pushed against Miner’s beaten hole. It howled with ecstasy as her final defense gave out.

The knot slipped inside, violently splitting her tailhole wide open, only to quickly vanish as Miner’s body greedily swallowed it up. Now trapped inside, the dog’s cock began twitching violently, before releasing a hot wave of feral cum. Miner Pony groaned and spluttered weakly, unable to do anything as the spunk surged inside. The noises that escaped her lips were unlike any she’d made before - the sound of a crying mare whose eyes had dried up long ago.

The Diamond Dog panted away happily to itself, as if it was just some normal, friendly little hound. It grunted occasionally as its cock let loose an especially powerful load, until the potent orgasm trailed off. Now the two were just sat in the darkness - one content, the other slipping out of consciousness. With no light at all, Miner had difficulty figuring out what was happening.

She could feel her ass shifting above her, before her whole body began to slide across the stones. The Diamond Dog - initially unbeknownst to Miner - had started walking away on all fours. The engorged knot still stuck firmly inside, Miner had no choice but to be dragged along for the ride.

How long had passed? Five minutes? An hour? Miner didn’t - and couldn’t - possibly know. The only sensations she had was the throbbing of her abused body and the cold stone beneath her.

Finally, up ahead. Light!

Miner was being dragged into another small cavern. There appeared to be large boxes strewn throughout - the earth pony couldn't be sure - her hazy eyes were failing her. Then, a sound. What was it? Singing?

No, sobbing.

The boxes weren’t boxes, they were cages. Sixteen or more.

Locked away in each was a bedraggled looking mare, presumably all dragged down from the surface. Many had distended bellies, swollen and rotund. There was no fight in any of them. Some even began to wag their tails as the Diamond Dog sauntered into view.

An empty cage. The door swung open. The dog stepped inside, dragging Miner into place. A paw pressed down against her head for purchase. She gritted her teeth as pressure built in her rear again - the dog was trying to break free.

Miner screamed with the effort as the dog finally freed itself, the beast spiraling backwards out of the cage. The exertion had taken its toll on Miner Pony. Her vision faded again, engulfed in darkness as she passed out.

When Miner Pony reawakened, she would be just another sex-slave of the feral Diamond Dogs. No name, no life, no chance. And she’d learn to like it.