It was the day after Hearthwarming and Pinkie Pie had decided to stay back for another weekend with her family on the Rock Farm. But she had a very particular motive in general for staying behind. She sneaked out of her room and into that of her youngest sister who she had just been touching herself to. Rubbing her clit and thinking about her just wasn't enough anymore.
"Psst, Marble, are you awake?" Pinkie asked unusually quiet for her.
She got no response so she proceeded to prod her sister in the back and repeat.
"Marble, wakey wakey." Pinkie repeated while practically rolling her sister over.
"Mmmhmmm." Marple Pie replied and sat on her bed rubbing her eyes.
"Good, I have a surprise for you, It's a late hearthwarming gift but you will have to FIND IT!" Pinkie exclaimed excitedly but still at a whisper."
Mmmhmmm?" Marble questioned, feeling confused from being woken up from such a deep sleep.
"Come on I have a surprise for you at the crystal mine, let's get going." Pinkie insisted as she started to push Marble by her flank towards the door.
"Mmmhmmm." She complied and continued forward so her sister wouldn't keep pushing her.
"Be very quiet, I don't want to wake anypony else okay." Pinkie requested
"Mmmhmmm." She agreed.
Once the two pies had gone fairly deep into the mine where the glittering of the crystals created a glow bright enough for them to see quite well. Pinkie finally stopped and turned around to face Marble. The grey earth pony looked around wondering what surprise her bright pink sister had planned. Her cute long straight mane flowing in a way that made Pinkie gush at how pretty she looked.
"So you are probably wondering why I have asked you here sis?" Pinkie Pie stated obviously.
"Mmmhmmm." Marble agreed.
"Well the truth is, I've always had a bit of a crush on you and I've always wanted to know if you feel the same way." Pinkie explained quickly hoping to let her confession escape as painlessly as possible. The butterflies in her stomach made her feel like she was going to be sick as she anticipated the answer.
"Mmmhmmm." Marble said looking surprised.
"Oh, you do feel the same way? Yay!" Pinkie squealed as she lunged at her sister and pulled her into a tight hug. "Oh the things I've been wanting to do with you! Can I kiss you?"
"Mmmh..." Marble started. But Pinkie didn't even wait for a response before forcing her tongue into her little sister's mouth and started exploring the smoothness of her perfect set of teeth. She put a hoof behind the back of her head to hold her in place as she slobbered all over Marble's face and forced her unnaturally long tongue down her throat.
Marble pushed Pinkie away from her hard with her forelegs and started to cough and gag from the intrusion. She then started to back away from her sister with a look of fear on her face, but the only way she could go was deeper into the mine.
"Oh I'm sorry, I got a bit carried away, I take it you don’t like me going down your throat?" Pinkie apologized.
"Mmmhmmm!" Marble replied loudly.
"Okay I'm sorry sis. You might just need to ease into it, but in the meantime there is a lot of other fun stuff we can do."
"Mmmhmmm." Marble replied.
Pinkie moved forward again towards her sister and Marble kept backing away.
"Oh are you playing hard to get? He he!" Pinkie laughed.
"Mmmhmmm." Marble said.
"Well I came prepared, I have lots more presents for you." Pinkie smiled.
Suddenly out of nowhere Pinkie pulled out a large cannon and fired it within seconds at Marble.
"Welcome to my BONDAGE CANON!" Pinkie squealed with excitement and in an instant Marble was suddenly wrapped up in chains, making her unable to move or even get up on to her hooves.
Pinkie then pulled another object out of the void. It was a set of manacles with a bar in between. Then approached the helpless little mare with a wide grin. Marble looked up at her with her beautiful purple eyes and started to tear up. Seeing this Pinkie stood in front of her and decided to check her beautiful sister was still interested in continuing.
"Do you trust me to continue, sis?" Pinkie asked.
"Mmmhmmm." Marble confirmed with tears starting to stream from her eyes.
"Okay good, it can be so much fun to feel a bit of pain and have a good cry, you'll see." Pinkie promised as she closed the manacles around Marble’s back hooves forcing her to keep them wide apart and spread wide open.
"Mmmhmmm." Marble whimpered.
"Oh I'm so glad you are into this too. Now you stay still while I play with you a bit." Pinkie said merrily.
"Mmmhmmm." Marble replied with fear and started to struggle in her chains. They were wrapped all around her front hooves and she could do nothing but very slightly shuffle forward.
Pinkie looked longingly at her little sister's beautiful snatch. In the middle of her grey fur was a pink slit that made Pinkie Pie drool. She put her hooves on either side of Marble's flanks and pulled her backside apart to open up her pussy so she could get a look deep inside. The aroma coming from the beauty in front of her, made pinkie's own marehood wink and start to ooze fluid ready to be fucked by anything that wanted her. Marble too now, from her touch was starting to leak and get excited.
"You enjoying yourself sis, you really want it don't you?" Pinkie asked.
"Mmmhmmm!" Marble exclaimed, a bit louder than usual.
"Good, good. This might hurt a bit at first, but you'll love it I promise." Pinkie offered.
She then started to rub her hoof around her sister's labia and rubbed teasingly over her clit as she passed over it.
"Mmmhmmm!" Marble cried loudly.
"Glad you like that." Pinkie said loudly to make sure she could hear clearly. "But this next bit might be a bit much for you, just let me know if you want to stop, Just say STOP! as loud as you can and I will, okay."
"Mmmhmm!" Marble sobbed.
Pinkie started to shove her whole hoof into her sister’s vagina. Stretching it's walls further than they were ever meant to go.
"MMMHMMM!" Marble cried.
"Wow you are a brave girl" Pinkie said impressed "let's see how deep I can go."
MMMHMMM!" Marble screamed and struggled helplessly in her chains.
Pinkie kept pushing even further and was now about 3 inches deep and Marble's passageway spread around her hoof snugly.
"Mmmhmmm." Marble was sobbing and seemed to have run out of energy to be so loud.
As Pinkie kept going deeper the skin wrapped around her hoof started to rip and bleed and Pinkie had to check again that Marble wasn't hurting.
"Are you okay sister, I think this might be getting dangerous, actually." Pinkie asked concerned.
“MMMHMMM!” She screeched, echoing off the cave walls.
"Wow you are so brave sis, but I think we should work up to going any deeper, I don't want to break you." Pinkie apologized as she pulled her hoof out and found it drenched in blood.
Marble tried to collapse but the spreader bars held her up and blood dripped out of her vagina along with her arousal and formed a puddle beneath her.
"Mmmhmmm." She said.
"Glad you are being sensible, you naughty mare." Pinkie agreed.
"But it's okay there are a lot of other fun things we can do." Pinkie said enthusiastically. "We have got all night to ourselves."
"Mmmhmmm." Marble replied unenthusiastically.
From who knows where, Pinkie pulled out a thick and brutal looking bullwhip and controlling it with her mouth caused it to make a piercingly loud crack in the air. This caused Marble to flinch in fear and again struggle furiously in her binds.
"Mmmhmmm! Mmmhmmm! Mmmhmmm!" She kept repeating in panic.
"Oh sounds like you are really looking forward to this." Pinkie said happily. "Why did you never tell me you were such a masochist sis, that turns me on so much."
Pinkie proceeded to rub herself in excitement as she showed off her control by snapping the bullwhip right next to Marble's ear, without making contact. The sound wave from it though cause her to go deaf and her ears to start ringing. Pinkie then proceeded to do the same next to her other ear. Marble could not hear anything now but the screeching protest made by her eardrums.
Pinkie then decided it was time for the main event and made the whip lash at full strength at Marble's right flank. It cut a wound across her cutie mark and immediately blood started to flow down her back leg pooling together with the blood from her marehood.
"MMMHMMMM!" Marble screamed.
Pinkie didn't stop there, she started to alternate between each of her flanks another ten times, with Marble screaming her approval with every lash. Pinkie finally dropped the whip and went up close to inspect the damage. Running her hooves over the wound to further intensify the pain. They were nothing but a bloody mess and there was no recognizable sign left of her cutie mark. Her cutie mark would grow back over time, but from now on it was likely going to be covered in scars.
Mmmhmmm." Marble whimpered softly.
Pinkie smacked her bloody flank playfully before moving back around in front of her little sister. She was crying hysterically and Pinkie pet her head with her blood soaked hoof affectionately.
"You are so good at handling pain sis, I never would have imagined. I'm a sadist and I am so glad that you not just really like me back, but are willing to do all this for me." Pinkie beamed as she hugged her sister.
"Mmmhmmm." Marble whimpered and cried.
"Did you want to keep going or...?" Pinkie started.
"Mmmhmmm." Marble replied.
"Wow you are the best sister ever!" Pinkie grinned excitedly and hugged Marble tightly.
Pinkie walked around her sister and inspected the damage. There was so much blood pooled all around her and this didn't look like it could possibly be healthy.
"I'm getting a bit worried about the amount of blood you might be losing, I think I should do something a bit less bloody with you now."
"Mmmhmmm!" Marble agreed with her eyes wide.
"Okay then I have an idea." Pinkie went over to one of the crystals and reached behind it to grab something. "I keep gags stashed all over the rock farm in case of gag emergency."
Pinkie laughed and held the ring gag up before Marble and started to secure leather straps around the back of her head. She then stuffed the ring into Marble's mouth forcing her jaw to stay uncomfortably wide open, while still allowing a wide hole for anything to be able to enter her mouth with no way to defend herself.
"Now you clearly had trouble taking my tongue down your throat, so I'm going to train you to get better at it and control your gag reflex." Pinkie explained.
"Mpfh hmpf" was all Marble could respond with now.
"Yay!" Pinkie clopped her hooves excitedly. "Here I go!"
Pinkie started with a normal kiss appreciating the warmth of her sister’s lips and the lovely rough texture of her tongue. She then ran her tongue around the metal ring that was keeping Marble's teeth helpless behind them from any resistance. She then started to unravel her impossible tongue beyond Marble's throat and down her esophagus. Immediately Marble's body reacted by choking and gagging, trying to squeeze the foreign object out. Marble then vomited, but Pinkie just flared her tongue to prevent to food from coming up and kept pushing her tongue further down until the food ended up back in her stomach.
'Ooooh you had rock soup.' Pinkie thought. She did find it annoying to not be able to voice her thoughts while she explored her sister's deepest insides. She then began to explore the contents of her stomach. While Marble's throat continued to choke and gag, giving her tongue a pleasant squeezing sensation. She got to taste everything she had eaten recently, there was even a cupcake in there. She wrapped her tongue around the half digested cake and started to roll her tongue back in. Before she got out she noticed that Marble's throat had stopped reacting.
Pinkie finally pulled the cupcake into her own mouth and munched down. "Mmmm sprinkles!" She commented happily.
When she looked down at Marble she realized her eyes were closed and she wasn't moving.
"Marble? Marble?" Pinkie shook her with her hoof. But she did not respond.
"Oh well this happens sometimes." Pinkie assured herself as much as her unconscious sister. "It's common to pass out your first few times. You'll be up soon I'm sure of it, then we can have more fun. I just hate waiting. Oooo, I know I'll get something extra fun ready for when you are awake again."
When Marble woke up she found herself in a completely new position. Her forelegs were hanging from the roof of the cave by a set of manacles and she was suspended in the air. In addition her legs were still pulled wide apart from a set of tight manacles and chains that were nailed into the floor. Even her tail she found she was unable to move as it too was tied in a knot with her mane, meaning that if she tried to move her head at all it would pull at her tail and scalp and threaten to rip her mane right out. She was now also in more pain than ever as the adrenaline rush she was under had now faded. She cried from the searing heat she felt from her stretched and abused pussy and brutally flayed flanks.
"Welcome back sleepy head!" Pinkie Pie greeted her, as she stroked her sister's face affectionately. "You passed out because you couldn't handle the deepthroating just yet. But it's okay I'll have plenty of time to train you every few hours all weekend. I don't plan to sleep he he!"
"Are you ready and well rested for some more fun?" Pinkie asked.
"Mphf hmpf" Marble replied, realizing that her mouth was still gagged wide open.
Pinkie petted her sister on the head. "That's great to hear." She then licked up some of the tears that were streaming down Marble's face. "Mmmm salty." She commented.
Pinkie then took her hoof and smacked her sister across the face leaving a bruise on her cheek.
"Are you okay with me hitting you like this?" Pinkie confirmed.
"Mphf hmpf" Marple responded while closing her eyes, to prevent damage to them.
"Hey, don't close your eyes slut, I enjoy staring into them, they are beautiful!" Pinkie warned as she smacked Marble across the other cheek.
"Mphf hmpf" Marble agreed opening her eyes obediently.
Pinkie grinned and happily stared into Marble's waiting and fearful eyes
"I'm sorry you don't mind me calling you names like slut and whore do you? just while we are having sexy fun of course."
"Mphf hmpf" Marble said.
"You don't mind, oh that's great, you stupid slut, whore, bitch! he he he he!" Pinkie continued enthusiastically and smacked Marble across the jaw.
"You are mine now slut, you are my toy to use however I want!" Pinkie exclaimed happily in character as a dominatrix.
Pinkie picked up a small needle sized crystal with a sharp edge and gave Marble’s chest a small prick with it to see how sharp it was. It easily slid into her skin and caused blood to drop out of the hole.
"This will work nicely" Pinkie grinned.
She then started to cut mercilessly with the little knife, lines into Marble's skin, creating bloody writing. Marble tried to look down to see what Pinkie was writing, but once again her tail and mane being tied together prevented her.
Pinkie provided her with insight by sounding out the words she was writing into her sister's flesh.
"I am a worthless slut... My mistress is Pinkie Pie... Every stallion is allowed to fuck my throat, please I need to learn." Pinkie giggled in satisfaction as she wrote.
"Mpfh hmpf!" Marble cried loudly from the pain that she felt immediately, this was more like a paper cut and stung so much she didn't notice the pain everywhere else so much.
Pinkie moved back behind her sister. The wounds inflicted earlier had dried up a bit now and so had the puddle beneath her. Leaving a large portion of the cave floor dyed dark red. Pinkie took the small knife and started to carve more words into her back. The first being an arrow pointing down the her anus with the words. 'Cum Dumpster' written above it.
"You really like being nothing but a sex toy, don't you sis?" Pinkie Pie asked.
"Mpfh hmpf." Marble replied.
"Well good because when I am done with you, All a stallion is going to see is invitations for sex all over you. But don't forget that I'm your mistress and you must always make yourself available to me first.”
Pinkie continued to write things she thought would be funny on any space she could find on her buttocks and back. "Don't be gentle... Make me scream... All that matters is that you have fun… Whore... Toy... Bitch... Cunt."
Pinkie then got an idea and moved back in front of Marble and rubbed her bruised cheek softly.
"You've been such a good girl. There is something I want to write on your face too, is that okay?"
"Mpfh hmpf!" Marble cried desperately.
"Wow you sound so excited about it." Pinkie beamed.
She then took the sharp crystal up to her sister's forehead and wrote. 'Gloryhole'. With a line running down her nose and a arrow ending just above her mouth.
"Ha ha, that is going to look so funny and you are going to get a lot of training now." Pinkie commented admiring her work.
The previously grey and colourless mare was now almost entirely red. The wounds left by the words were dripping now, but would heal and scar to become permanent writing. Pinkie ran her hoof over her sister and felt her flinch as she went back behind her, Where Marble could do nothing but dread what might be coming.
Pinkie picked up another much larger crystal with a sharp edge and started to tease Marble's sore marehood with it.
Marble flinched in fear. "Mpfh hmpf! Mpfh hmpf!"
Pinkie took this as a go ahead and started to shove the crystal deep into her sister's vagina.
"The problem with me trying to put my whole hoof in before sis is it might have been a bit too big to start with. This crystal will start thin and get thicker as we go deeper." Pinkie explained as she forced it in. It seemed to get stuck a few times but she just kept forcing it, even hitting the end of it like a hammer to push it.
"MPFH HMPF! MPFH HMPF!" Marble screamed.
Pinkie then grabbed a similar and slightly smaller crystal. and started to poke at her anus with it.
"MPFH HMPF! MPFH HMPF!" Marble screamed in fear as she struggled.
"I take that as a yes then, here it goes." Pinkie said as she again shoved this crystal into Marble's tail hole without mercy. Forcing it no matter what the sharp point inside her seemed to get caught on.
"MPFH HMPF! MPFH HMPF! MPFH HMPF! MPFH HMPF!" Marble screamed.
"Whew, that was exhausting Marble, was hard forcing those in you." Pinkie said wiping her brow. "How about we take a break?"
"MPFH HMPF! MPFH HMPF!" Marble screamed in agreement.
"Just one more thing." Pinkie said as she stood back in front of her sister.
"MPFH HMPF!" Marble shouted hopelessly.
Pinkie laid on her back in front of Marble and opened her back legs wide to give Marble a wide open view of her sex. She then started rubbing her clitoris excitedly.
"Oh yes, Marble, you look so adorable like that... Mmmmpf... Covered in blood, helpless, willing to consent to anything... Mmmmpf!" Pinkie gasped as she masturbated furiously.
"Mpfh hmpf." Marble whined.
Pinkie soon reach her orgasm and sprayed her juice all over her sister. The fluid that got into her wounds stung, but nothing compared to the rest of her wounds. She took her hoof out from between her legs and licked her hoof that was now covered in her nectar.
"Mmmm, I taste great today. You want a taste?" Pinkie asked.
"Mpfh hmpf!" Replied Marble.
"Okay then here you go." Pinkie got up to her hooves and wiped her wet hoof onto her sister's dried out tongue. "Yum, isn't it?"
"Mpfh hmpf..." Marble accepted.
"Whew I'm exhausted, we can have more fun tomorrow. Catcha laters!" Pinkie said as she headed out of the cave leaving Marble still helplessly chained.
Marble struggled with all her might, for hours. But it was useless and she was getting faint now. She felt something icky climb down her foreleg down from the roof of the cave. It felt tickly and she was scared it would bite her. It climbed onto her face and she tried to shake it off, but even with pulling a lot of her mane out of her scalp she couldn't shake her head hard enough to get it off. It was then too late, it crawled into her gaping open and defenceless mouth. The ring gag kept her from being able to bite it.
"MPFH HMPF! MPFH HMPF!" She protested, before it started to crawl down her throat and into the esophagus. She choked and gagged, but despite all that she soon felt it moving around inside her stomach.
In the next few hours the crystals that had been shoved inside her had eventually fallen out. While Marble was initially relieved, she also felt a lot of blood fall out of her too. She assumed she must have had a lot of damage done to her internal organs. It was only a matter of time now. She closed her eyes, waiting for death to take her and release her from the agony she was in and to escape from ever seeing Pinkie Pie again.
"Mpfh Hmpf"
Were her last words as she saw the light and the sweet embrace of death, she smiled at last.
