What Happens in the Cellar...

Rarity poked her head into the farmhouse. There was no sign of ponies anywhere, so she slipped inside and locked the front door. There was no way she would risk a scandal and have other ponies barge in on what she feared was going on inside.

The kitchen was empty. So was the dining room. A soft sound of pattering hoofsteps told her that somepony was upstairs, and she intended to investigate that next, but she needed to be sure the downstairs was clear first.

Bathroom? Clear. Living room? Clear. Laundry room? Clear.

That left the hoofbeats upstairs. It didn't sound like anything lewd was going on up there, but she was still terrified of what she might find as she slowly climbed the stairs, taking care to be as quiet as she could.

The hallway at the top of the stairs was empty. Most of the doors stood wide open, with only the two last rooms still closed: the bathroom, and Apple Bloom's bedroom.

Hoofbeats sounded again, followed by Sweetie Belle trotting across the hall, levitating a neatly folded pile of sheets, several comforters and two pillows. What would the filly have needed clean linens for, unless... was she too late?!

"Sweetie Belle!" Rarity gasped aloud.

"Huh?" Sweetie's voice floated back as her head popped back through the doorway. "Hey, you're not supposed to be in the farmhouse. I'm going to have to ask you to leave. The party has to stay outside."

"Ahrrrrrgh!" Rarity huffed in frustration, stomping the rest of the way up stairs and into the room that Sweetie had just–

She stopped in the doorway. Sweetie Belle was removing perfectly clean sheets from the bed and folding them with her magic, almost like she was performing some routine room service task. "You... What are you...?”

"What, were you expecting something else?" Sweetie asked. "There are some ponies who need these right now, so I'm helping them out."

"Helping them out?!" Rarity squealed. "Young lady, you most certainly are not!"

"Look, not-Twilight," Sweetie Belle said dismissively, pushing past her into the hallway again. "I know you're not her, and you don't have authority here, so if you'll excuse me."

The little brat!

Rarity deflated as Sweetie Belle opened Apple Bloom's room and continued stripping the last bed. "But what about Big Macintosh?” she asked, desperate to understand what had transpired. “I saw you with him when you came to the farm house. He has to be in here somewhere!"

"Oh, no,” Sweetie Belle replied. “He was a stallion who needed to leave the party, something about an anxiety attack. It's a thing that happens. Poor guy didn't know which way was the way to town, so I helped him get out."

That was the way she'd be using it herself later tonight to get back to— "Wait, aren't you supposed to be minding my boutique?"

Sweetie Belle grinned. "Ah, so you're Rarity," she declared. "Look, things have gotten a little screwy, and you're definitely one of the ponies that needs to be 'in-the-know', if you get my meaning. So, here’s the knowledge: I might look like your sister, but I'm actually Pinkie Pie. There's been a mistake with the potions and a bit of a mishap with the Crusaders."

"Wait, then where's my Sweetie Belle?!"

"The important thing for you to know is that your sister isn’t here, she’s safely with Twilight at the Boutique, where she’s supposed to be. Everything else is super complicated, and I'll explain it to you later."

Rarity frowned. When things were serious, Pinkie Pie was never one to be ignored. She trusted Pinkie Pie implicitly, but couldn't be sure if this actually was Pinkie Pie.

"How can I be sure you are Pinkie Pie?"

Sweetie Belle stopped folding the sheet she'd just stripped off of Apple Bloom's bed and stared Rarity straight in the eye. "The Tasty Treat is more than just the name of the restaurant. I know what you did to convince Coriander Cumin."

Rarity raised her hooves in surrender. "Okay! Okay! I believe you, please don't say anything more."

"Really,” Pinkie replied. “I thought it would be fun to go into more detail."

"If my sister is taken care of, then what should I do?"

Pinkie Pie gestured with both hooves toward the party outside. "Get laid!" she said with far too much enthusiasm for Sweetie Belle's voice. "Twilight's already out of commission, so that's a +1 that's needing attention from a mare. Don't let all the stallions down."

Let the stallions down? — "Zephyr!" Rarity shouted. She needed to find Zephyr.

Twilight could handle the fillies, and she knew she could trust Pinkie Pie to preserve Sweetie Belle's innocence.

"Zephyr?" Pinkie asked.

"Yes, very suave this year. Do you know who he actually is?"

"Any other year, and I'd tell you to find whoever's mercilessly hitting on Rainbow Dash, but since she's indisposed with the baby..."

"No, I don't mean the real Zephyr, I mean who's really in Zephyr.” Pinkie’s mouth twitched. “He's such a gentlecolt, and so handsome..."

"Sorry,” Pinkie replied. “I don't know."

"Hmm, I need to find him. And promise me you'll stay out of sight? I would hate for my daughter's reputation to be ruined by such a scandal."

"Oh, pfft. Rarity, I am a master at stealth even without a horn. Nopony will see me unless I want them to."

As if to elaborate on the point, Sweetie Belle vanished before her eyes, and the folded fabric floated past her and on down toward the staircase.

"Hmph. Just behave."

"I will," the small voice said, disappearing further down the hall.

Rarity turned to Apple Bloom's bedroom window. This was, of course, the perfect vantage point to scout out the party. Surely she'd be able to see Zephyr Breeze down there somewhere, if he was still around.

But after a minute of searching, there was no luck in finding him anywhere. Still, quite a few other handsome options were available. And with a bit of focus, using Twilight's excessive pool of untapped mana, Rarity teleported herself back down to the festivities.

Apple Bloom had finally stopped crying. She'd gotten so worked up about ruining Granny's birthday that, between it and her confusing hormones, she hadn't been able to stop the tears until Granny had embraced her and whispered assurances in her ear for a time. "I'm okay, now," she said weakly. "Thanks, Granny."

The cellar door swung open unexpectedly, and piles of bedding were tossed haphazardly through the door, before the door slammed shut. "I wasn't listening, I swear!" came Sweetie Belle's voice. "Still trying to find Sweetie Belle and Scootaloo, I'll be back when we find them."

Granny grabbed the thicker comforters and began to build a sizable nesting spot for them to lay down in, sparing them from the cold chill of the cement beneath.

"Granny," Apple Bloom asked. "Can you tell me what actually happened? What's this party supposed to be about, and why am I like this right now?"

The room stayed silent for several minutes as Granny continued building a comfortable place to lay down, and then set down one of the pillows and laid down on the ground.

"Well, it's a long story," Granny said, leaning into the pillow.

"I don't think we're going anywhere any time soon," Apple Bloom reminded her. "And it's kinda boring here."

Granny nodded. "I suppose so." Then she patted a spot next to her. "Lay down and I'll tell you about it."

Apple Bloom pawed at the ground to flatten out the wrinkles and spread the fabric around a bit before flopping onto her side, her larger-than-normal form hitting the ground with a solid whump. Granny's foreleg pulled her close.

"A long time ago," Granny began, "long before the feud between the Apples and the Pears, there was a much more tame conflict between my parents and your grandfather's parents."

Apple Bloom snorted. "Really?"

Granny nodded softly. "My parents thought that green and yellow apples were better than red apples, and that's how they raised me. His parents thought that red apples were superior, but for them it was a very tongue-in-cheek kind of superiority. The kind where you know it's little more than a silly joke.

But your grandfather, Winesap Apple, fell in love with me anyway. I was a green apple who didn't think that a red apple was worth her time. My parents were not very good ponies, so I rebelled against them, and went and got knocked up by one of the Pears."

"Was that pony you?"

"Hush, child, I'm getting to that. The fool Pear didn't want to take responsibility for the foal. Winesap, infatuated as he was, swooped in and tried to help. At first, she pushed him away; he was a red apple, and that wasn't acceptable. But he persisted, showing her nothing but love and kindness. And she slowly relented, eventually accepting him into her life. And they were going to marry, soon before the baby was due.

"But Winesap was also a clumsy fool. He tripped on a candelabra during the ceremony, which fell into the drapes and started a fire. Both families were predominantly earth ponies, so there were no pegasi in attendance, and by the time a fire brigade was able to get the clouds down to extinguish the blaze, it was too late; the entire chapel had been irreparably damaged.

"Your Uncle was born not long after that, but we knew we wouldn't be able to care for him, so we sent him to live with your great uncle Orange."

Apple Bloom sat up straighter. "Uncle Orange is a Pear?"

"He is. That's what started the feudin’. The Pears didn't like that we sent one of their own off to Manehattan to live a fancy lifestyle - a lifestyle away from them, where they couldn’t see her. Our lives changed from that moment. But we persevered.

"Your grandfather Winesap loved me. We loved each other a lot, and passionately. Everywhere we could get away with it, in fact,” she added with a giggle. “But then, all of our parents passed away during a harsh winter the next year, so when your father was born eleven years later. With four less mouths to feed and an entire extra farm to sell - we were better prepared to take care of him. And we did just that."

"And then grandpa died when dad was 2 years old," Apple Bloom said softly.

Granny nodded. "He did. Left me to raise your father alone. The Pears told me I deserved it for what I'd done with their child, and I couldn't argue. I believed for years that karma had simply reared its ugly head and banished me to a life of misery!

"I became depressed and reckless, seeking what I thought was love, wherever it could be found. I latched onto every stallion I could find that would give me even a moment of their time. Even then, I didn't understand the difference between sex and love, and all of them used me and then cast me aside. I even took out a loan against the farm just to keep from losing it because of the money I spent in pursuit of false love. By some miracle, I never became pregnant again, but those five years were a dark time for me. It was Tall Oak that finally brought me around, set me back on the right path. And a few years later… well, you know about how your parents got together after that."

"I do," Apple Bloom replied, nodding repeatedly. "But that doesn't really explain the party?"

Granny chuckled; a bright cheery laugh that sounded foreign even to Apple Bloom's ears, despite being in her own voice. "I’d fallen in love with sex, child. By then, I’d realized that sex and love weren't the same, but I still loved to get a good... uh... Well, good sex. But I'm much older now, and things have changed. My birthday parties aren't supposed to be for children, and the reason is that we swap ponies so everyone can share the excitement of rutting each other without knowing who's who."

Apple Bloom nodded in understanding. "That's why there's a body swap, then."

"Exactly,” Granny said, blushing. “Pinkie and I hide away an extra potion so I can take whatever body she gets for a spin. Pinkie then sits out and pretends to be me for the night. I need my body back intact, and there's not much demand for an old maid like me, so Pinkie sacrifices herself for me. It's also the only time I can get bucked by a stallion who won't shatter my spine the moment he mounts up."

"Couldn't you find a stallion like Randolph for that?"

Granny stopped to think for a moment. "What, you mean the Rich family butler?"

"Yeah. Someone your own age."

"Pfft," Granny spat. "No one my age can keep up with the kind of rutting I crave."

"And that's the only reason you're throwing this party?"

Granny Smith nodded.

"I see…” Apple Bloom said, lost in thought.

Silence passed between the two as they each pondered the situation they were in.

"It's okay," Apple Bloom finally replied. "You can... touch me."

Granny blinked. "What?"

"My filly parts," Apple Bloom continued. "You can... touch them. Like you were when I first came in. If you want to."

Her guilt came crashing back. There was no way that she could harm this poor girl. "No, Apple Bloom, no," Granny apologized. "I shouldn't have done that. That was wrong."

Apple Bloom shook her head. "This party is supposed to be for you. You created this party just for ponies to have fun. I think that’s really good for ponies. And I went and ruined it for you. So... I want you to enjoy yourself."

Granny’s defense cracked. The one pony who would be hurt by such an act was there, telling her it was okay. "Are you absolutely sure?" she said, her lip quivering with fearful anticipation.

Apple Bloom nodded. "I am.”

Granny said nothing, searching Apple Bloom’s features for any uncertainty, and finding none. Finally, she allowed the little yellow hoof to slowly slip down toward her gash. It brushed against the darkened lips, bringing forth a shiver of anticipation.

For her own part, Apple Bloom had never seen anything like it. Even with her best friends, she'd never examined their privates before - and most certainly not the way Sweetie Belle and Scootaloo had been exploring each other just a scant few hours ago.

Apple Bloom watched in rapt wonder as the little yellow hoof played and teased at the winking nub of her clit. The teats perked up, too, with nipples standing tall and swollen from their small, soft mounds.

She started fidgeting, trying to get a better view of the action. Granny seemed to understand what she was doing, and scooted to the side, leaning back into her pillow and biting on her other hoof. A slight squeak escaped her lips.

Apple Bloom brought her head down close, watching the swollen flesh of her own vulva part for the exploratory hoof. The clit winked in and out spasmodically, a sure sign that Granny was receptive. She stared, enraptured with the swollen red organ that continued to greet her.

The hoof started to dig in deeper, parting those slickened nether lips even further. Instead of fast, teasing rubbing, Granny had shifted to slow pulls, grinding the yellow hoof against the soaked, sensitive flesh, groaning out soft tones with each stroke. Apple Bloom could see into herself as the hoof moved, a narrow, fleshy canal leading deeper into her body's core.

The fleshy walls expanded to admit the foreign hoof, blocking Apple Bloom's view of the tunnel and giving her a moment to observe yet another thing - a smaller hole. She knew from her sex ed classes that this must be her urethra, but she'd never seen anything like it up close.

As she continued to watch, listening intently to Granny's impassioned but cute little vocalizations and the tantalizing sounds that came from her steaming hot crevice, a curious odor assailed her nostril and intense discomfort had made its presence known down at her groin.

Granny was lost in her own masturbatory pleasures, her eyes closed, head back and breathing quickening. Apple Bloom had never brought herself to an orgasm before, but she understood what it was, and Granny seemed to have brought herself right up to the edge.

Apple Bloom tore her eyes away from the erotic sight in front of her, sitting back against one of the cider casks to marvel at the strange sight: a deep red shaft - her brother's stiffened member - stood at attention in front of her. A small bead of fluid glistened around the hole in the tip. Curiously, Apple Bloom lowered her hoof down to touch it. It was firm and warm, and the slick bead of fluid allowed her hoof to glide seemingly effortless across the tip.

And it felt amazing. Apple Bloom slowly ran her hoof along the length of it, staring intently at the hole in the swollen tip that was slowly dribbling fluid. That hole was where semen came from?

She watched in morbid fascination, stroking her hoof up and down the shaft as the fluid pulsed forth with each of her languid strokes. It was like it was alive, and each stroke brought forth a little shiver of delight.

Her eyes drifted closed as she stroked slowly, savoring the pleasure of a new experience and listening to her own gasps of passion as Granny worked closer and closer to that moment.

A voice cried out in ecstasy. Apple Bloom's eyes shot open just in time to see a veritable flood of fluids escape from her own filly sex, splattering against the bedding and making a sizable stain. Granny wasn't slowing down, either, her hoof continuing to make frantic grinding motions on the little nub of her clit.

Apple Bloom stared at that quivering hole, idly stroking her brother's cock. She wondered what it would feel like - to have a part of herself wholly enveloped within another pony, blissfully cleaving onto each other.

And almost without thinking, she stood, her brother's massive tool slapping against her belly in anticipation. Granny opened her eyes as the massive form of Big Macintosh blocked the light from the lantern above.

"Winesap...?" Granny moaned in a near delirious state. "Please..."

Apple Bloom wasn't sure how to proceed, but something was driving her to do it anyway. She bent down and embraced the body below her, kissing the quivering lips of her desperately delirious ancestor. As their lips pressed together, something touched her shaft, manipulating and moving it, until it came to rest against something very warm, and very wet.

Her body knew what it wanted. It knew what to do. Without any consideration for what was about to happen, Apple Bloom pressed her hips forward. Pressure gave way as the comparatively tiny lips of her own vulva spread open for the engorged intrusion.

The x-ray spell Pinkie had put on the door was doing wonders. Her own filly hoof grinded powerfully against Sweetie Belle's delicate folds as she watched one of her wildest fantasies come to life in front of her.

"Nnnnnngh!" Granny moaned out around their connected lips.

There was an impossible warmth wrapped around the tip of her alien appendage. And impossible pleasure flowing in her veins. Apple Bloom pulled back and gazed down at her own face. Never before had she seen herself as beautiful, but in that moment, there was another impossible feeling: the impossibility that she could stop now.

She pressed forward further, the towering flesh sinking into the confines of her own body. The grip of those slickened fleshy walls clamped down on the intruder, squeezing her shaft with a rippling motion.

"Ahhh~~hhh!" Granny moaned out. "So big!"

There wasn't room in her mind to stop. Apple Bloom continued to drive deeper into the very depths of herself, stopping only when she came to a barrier that resisted any further pressure.

Those scant few seconds had been more sensual and more intense than any other seconds in Apple Bloom's entire life. And it was over. There was no more room to move... except back.

"Mmm..." Granny moaned as Apple Bloom began to retreat. The grasping, muscular walls clamped down tightly on her member, sending sparks of indescribable happiness and desire flying through Apple Bloom's nervous system. She thrust forward again. And it felt right. This was what her brother's body wanted.

Out and in, out and in, Apple Bloom began to accelerate her thrusts against the pony below her, and a strange sensation began building up in her core. She didn't know that feeling, but it felt warm, heavenly, and inevitable. Nothing would stop her from finding out what it was.

Granny began gasping for breath. "I'm... gonna..."

"I'm gonna," Apple Bloom agreed, her breath becoming a little ragged. She didn't know what it was gonna be, but there was no denying it.

"Knock me up again, Wine," Granny gasped. The narrow passage clamped down hard around the incestuous cock inside its walls, fluid gushing from somewhere within and warming Apple Bloom's borrowed anatomy with damp, sticky femme cum.

Her grandmother's orgasm quickly brought her to her own peak, and her entire body convulsed - waves of electric pleasure flowing in and out, centered on that alien tool. Pulsing and throbbing within the tight confines, Apple Bloom could feel something moving inside of her, flowing out of herself and into her other self.

"Ahhh!" she cried, releasing a breath she didn't know she was holding. Her thrusting stopped and she hugged her body tightly against herself, unloading pint after pint of seed into those depths before flopping over to her side and staring at the dimly illuminated ceiling.

Both ponies lay on the soaked bedding, gasping for air.

And without a word, Granny Smith burst into tears.

"I'm sorry, Apple Bloom," she said around choked sobs. "I should never have done this. I shouldn'ta let you..."

"No, it's okay, Granny." Apple Bloom said, pulling her grandmother into a tight. "It was amazing! I loved it."

"I'm a terrible grandmother."

"No, you're not. I wanted it."

Granny's sobs softened. "You really did?" she said, eyes sparkling with tears as she looked up at her grandson's face.

"I really did," Apple Bloom confirmed. "And to be honest, I still kinda want to."

Granny shook her head. "I think... I think I need to rest."

The door creaked open ever so slightly, and a white filly stepped into the cellar. "If you don't mind," Pinkie Pie purred, looking up at Apple Bloom, "I'll help you out with another round."