A Womb's Filling Eve

"Come on, just tell them."

"Are you out of your mind? They would be furious!"

"Why would they? Mom is crazy for some grandfoals. And dad will be happy I finally got a marefriend."

"Stop saying that, I am not your marefriend."

"Whatever, sweetheart. What's your plan then?"

"I don't know, just get this weekend over with and write letters until next Hearth's Warming. It only takes 11 months so it'll work out."

"Uh huh. And you'll just hide your belly the whole day."

"Well, it would be easier if it was on one side, but somepony just had to go and knock me up a second time."

"I told you I was sorry. But that asymmetrical paternity mark was driving me crazy."

"Sure it was."

"I could give you a third one in the middle if you'd like, make it a triangle."

"Oh, hush. Now remember to walk right in front of me, and distract them with something so they don't have time to look!"

Fluttershy took a deep breath before rounding the corner, closely following behind her brother who was already trotting inside the living room. Their parents were busy at the breakfast table, her mother arranging the festive plates while her husband was pouring coffee for everypony. Posey Shy spotted them first, turning towards her son.

"Good morning fillies! Slept well last night?"

"Morning mom, like a little foal."

"That's, great. And you Fluttershy, enjoying your old bed?"

The icy stare Shy had focused on the back of her brother's head a moment earlier was immediately replaced by a rising blush.

"Uhm, yeah, thanks."

Quickly averting her gaze she started towards the nearest seat, careful to keep her stomach low.
Her brother had already taken a seat, idly chatting with Gentle Breeze, at least keeping him occupied for the moment.

Posey turned around, ready to head into the kitchen. Before she could start off her daughter's plot passed her. Immediately her nostrils flared and her head snapped back. Fluttershy froze in place as her mother's snout sniffed the air around her. The two stallions at the table looked curiously as the seasoned mare followed the invisible trail hanging in the air, her nose guiding her to the source of the unmistakable smell. Her daughter could only stare in horror as she came closer and closer to her backside, her tail desperately clamping down to preserve her secret.

Completely mesmerized Posey booped her nose against her daughter's rump, the loud eep from Shy rousing her from her thoughts. With wide eyes she looked at her little filly.

"Fluttershy, dear, is there something you want to tell us?"

"I-i don't know what you mean."

Posey continued to look at her while a worried Gentle walked up to her other side. Now trapped Fluttershy threw Zephyr a desperate glance. Her brother helpfully shrugged and sipped from his coffee. Turning back, she looked at her mother again.

"Listen darling, I have been a mother for quite a while, and older mares tend to have some expectations about their foals starting their own families. I could smell an expecting filly from Canterlot to here."

"Well, uh, it's not that simple."

"Don't worry, it'll all be fine."

Softly Posey reached forward, putting a hoof against her daughter's wither and pushing her back.

Fluttershy gave up her resistance, plopping down right were she stood. Her parents looked on silently as their daughter's belly was now at full display. Right below her belly button they saw two new markings, their son's cutie marks shining proudly from the yellow background.

This could not have gone any worse. Fluttershy was pretty sure of that. Motionless she sat on the ground, her traitorous body announcing her incestuous shenanigans to the world. Posey and Gentle continued to stare at her with disbelief, their mouths hanging wide open. Zephyr turned the page in his newspaper.

"Mom, Dad, listen, I know-"

"TWO? Two grandfoals at once? Oh darling, you make mommy so proud."

The next moment Fluttershy was caught in a spine-breaking hug, her mother barely containing her excitement.

"Finally, I was starting to get worried you might never find your special somepony!"

"MOM! He's not-"

"What a fantastic gift for Hearth's Warming. I can't wait to start the preparations."

"Preparations? What are you talking about?"

"Oh, you know. What color to paint the nursery, what cribs to buy, which wedding location to book, things like that."

"W-wedding?"

"We have to be quick if we want a date before you are due. That purple friend of yours has connections to Canterlot, right? Maybe she could get use a nice chapel on short notice. And we'll need a special dress for you. Does that tailor in Ponyville sell maternity fashion?"

"Mom!"

While his wife continued gushing on about weddings and pregnancy books Gentle turned to Zephyr.

"Good job, son. Your mother is crazy for some offspring, I'm glad somepony finally bred her."

"Dad!"

"Sure thing. Would have been a damned shame if nopony put a bun in her oven. Or two."

"Zeph!"

Fluttershy was beyond mortified. What should have been a nice and normal holiday celebration had quickly spiraled completely out of control. Here she sat in the middle of her parents' living room, pregnant with her brother's foals, her mother cooing and caressing her not yet showing foal bump, her father joking which mare in the family was the better lay. Everything that could go wrong had gone wrong.

As if she read her mind, Posey let off her midsection and cantered over to Zephyr. Rising up she gave her son a similar bear hug, nuzzling his cheeks as if he was her little colt again.

"I'm so proud of you, Zeph. Just going out there, finding yourself a marefriend and giving your mother her grandfoals. And you didn't even leave the house for it."

She whispered into his ear.

"Thank mom. It sure was some hard work but in the end she came around. Twice."

Still not breaking the hug Posey looked down, their touching chests concealing the view on the warm length poking her in the belly.

"Mmmh, I can feel the hard work alright."

Zeph grinned sheepishly, his member coaxed from his sheath by all the talk of fertile mares.

"Heh, sorry for that."

"Don't be sorry. You did very well last night. But-"

"But what?"

"Oh, it's just, I know I sound ungrateful, but I was expecting grandfoals from two separate couples. And now that you chose your sister as a mate, there's only half as many as I was hoping for."

"I wasn't thinking about that. How many did you hope for?"

"You know, no particular number. Just a herd of them."

"Well, I would hate to disappoint you. Should I breed her a third time?"

"Thank you Zeph, you are such a considerate son. But I have a better idea."

"Is that so?"

"I know your dear mother is not exactly a young filly anymore, but I do still have some productive years left in me."

"Go on."

"How does siring some half-siblings, half-foals sound to you."

"Intriguing. But what about dad?"

"Don't worry about him. Gentle, dear?"

"Yes, honey?"

"Would you mind bucking some more grandfoals in Fluttershy while I ride our son dry?"

"Not at all, that's a great idea."

"Wait, what? Do I get to have any say in that? Dad, wha-"

Fluttershy had stared dumbfounded as her mother slowly started grinding her body against Zeph's. It wasn't hard to guess what exactly her soft belly fur was brushing against, and their excited whispers seemed similarly inappropriate. She was so distracted that she complied instinctively when Gentle Breeze bit down, holding her carefully but firm by her right ear and pulling her back up. Stepping over his daughter, her slender body fit perfectly under his as he let go, instead placing a hoof at the back of her head, pushing down. Fluttershy barely had time to comprehend the situation as she now found herself on the floor, face down and ass wide up.

She turned her head sideways to look at her mother and brother, desperately seeking somepony to make sense of the situation. Zephyr had also moved his chair, now facing her directly to have a front-row seat for what was about to happen. He had to look over Posey's shoulder though, as she had climbed onto the chair with him, grinding her hips on his lap.

"Zeph, what the Tartarus is going on."

"Sorry Butterhush, mom just wants to have some more guests next year. So we decided to make them ourselves. Mom, you ready?"

"More than ready."

"Then hop on."

Fluttershy could only stare in horror as Posey's wings spread, giving her some additional lift as he rose up from Zephyr's lap. His erection sprung free, standing completely upright underneath her. Zeph used one hoof to steady his cock, aiming it at the right hole. With his other he reached up, gently getting a hold of the hovering pegasus, guiding her down. His tip made contact with her marehood, but instead of careful adjusting, his mother decided to showcase her experience.

She folded her wings and relaxed her hind legs, gravity instantly doing its job. Her son moaned loudly as she slid down his entire length, not even slowing down slightly as his ring briefly stretched her entrance before disappearing inside.
With a lewd twack she landed on his lap again, now fully impaled on his member. After quickly feeling around to the new intruder Posey started moving sideways, grinding her hips against Zephyr's in a circular motion.

Gentle Breeze had stopped his preparations for a moment, enjoying the show his family put up for him at the breakfast table. Turning his attention back to the mare below him, he leaned his head down next to her ear.

"See that, dear? No way your mother could take him in one go if she didn't ride the fattest cock in Cloudsdale every night. You'll take his dick like a champ once I'm finished stretching you out."

Not even waiting for an answer he kicked her hind legs apart, her body sinking even lower and into the perfect breeding position. His dick was already hard as a rock, eagerly dripping on his daughter's spine. Quickly he pulled back, angling it down and pushing it against Fluttershy's entrance. Front hooves placed directly before hers he applied pressure, holding her in place as he quickly parted her swollen lips and sunk himself inside. With a few short thrusts he worked himself to a safe depth before stopping for a moment, now completely embracing his daughter inside and out.

Posey looked back over her shoulder, happy to see her husband already hard at work.

"How does she feel, honey?"

"Tight and docile, just like I imagined. It's a shame I didn't get to break her in."

"Sorry dad, took a lot of persuading to even get her here though."

"True, but I'm calling dibs on my first grandfilly. About time I get to pop a cherry again."

"Sure, if you help me double dick mom up her pussy later."

"Deal."

"Zephyr Breeze, you better make sure you can handle your mother alone before you start planning a threesome. Now hold on to your chair, because this will be the ride of your life."

Zephyr locked eyes with her, showing his signature smug grin. A loud smack made Posey eep just like her daughter as his hoof connected with her flank, her plot rippling from the slap as a bright red spank mark started to appear.

"Giddyup then."

"Oh no, you didn't!"

Furious, Posey tensed up her hind legs, lifting her bottom of his crotch, strings of marecum connecting their privates together. More and more of the light green cock slipped out of her tunnel until she could feel his head stretching her entrance from inside. Instantly she reversed course, slamming down with full force, completely driving the air out of Zephyr's lungs as she impacted on his groin with a wet squelch. Giving him no time to recover she repeated her assault, bouncing in his lap over and over again at a literally breathtaking speed.

His wife now occupied, Gentle Breeze turned his attention back to his daughter. Going at a more gentle pace, he carefully whipped back and forth with his legs, his member sinking deeper inside of her at a slow but steady rate. Nuzzling her behind the ear, he whispered down to his filly.

"How are you feeling, Shy?"

"Ah- daddy, sooo full."

"Don't worry, it's almost half-way inside."

"Dad, we mmmh, we shouldn't be doing this."

"Doing what?"

"This, h-having sex."

"Oh?"

Gentle increased the pace, each thrust now rocking his daughter between his stable hooves.

"We are relahh- related, it's wrong."

"You didn't seem to have a problem when Zephyr knocked you up."

"It was an accident, I told him to pull out."

"So you just hopped on the first dick you saw while you were in heat? I didn't know I raised such a whorse for a daughter."

Making a few harder thrusts and flexing his muscles, his medial ring finally made it in, stretching Fluttershy more than ever.

"Nnng, there we go. I raised and reared you for so many years and this is how you thank me, by bucking your own brother behind my back?"

"I am sorry, daddy."

"I know, but don't worry, we can still make a fine and proper mare out of you."

"H-how?"

Gentle leaned on his daughter, one hoof sneaking under her, gently rubbing her belly.

"Simple, I will cum inside you. I will hold you steady and empty my balls deep inside your fertile womb. And then, when I'm done, I'll do it again, and again and again. And once he's done with your mother Zephyr will mount you too, we'll fill you from both sides, a nice family spitroast."

"You will do that?"

"Of course. We will inflate your tummy, give you a nice round and pregnant belly."

"But ponies will know-"

"Know what, that you are a dirty little filly, spreading your legs for your own kin? Oh, they will know once they see you, they'll think you have cutie pox with all our paternity marks on you."

His hoof now pressed down, circling her belly button to the beat of his thrusting hips.

"With a tummy this round you won't even be able to walk properly. How does that sound, your belly dragging on the floor, filled with our incestuous foals?"

A sound from behind answered the question, Fluttershy's furiously winking clit releasing a gush of marecum, splattering his balls and splashing on the floor.

"You're making quite a mess dear. Somepony will have to lick that up later."

Over at the table things were equally heating up. Posey was giving her legs some rest, content with having her son lift her up his tapered shaft before dropping her back down, his hooves digging deep into her supple flanks. Zephyr's mind was racing like crazy, demanding he mark this beautiful mare in his lap as his at once. His balls were full again, filled to the brim with his virile seed, only waiting to claim another womb. Thankfully his mate wasn't far behind, her face flushed a deep red, biting her lips in an adorable way. Mustering all his strength he lifted her again.

"Buck, mom, I'm close."

His mother slid back down, their hips connecting.

"So am I sweetheart."

Up she went again, the strain clearly visible on Zephyr's pained expression.

"Uff, ready for your next offspring?"

Once more he bottomed out, the mare's womb already wide open, welcoming the tip kissing its back wall with every thrust.

"As ready as I'll ever be."

"Alright, here it comes."

With all his remaining strength he lifted her high up in the air, his lubed-up cock bending slightly as it slid out. Posey braced on her son's shoulders, helping him prepare for his final assault. She could feel him withdrawing from her love canal before stopping at the apex of his thrust one final time, ready to claim her.

"Do it Zeph, make me a mommy again!"

He didn't need to be told twice, letting her slide down his entire length one last time. The two connected with a thunderous slap, her exposed and swollen clit rubbing hard against his groin. Zephyr took hold of her, his legs embracing her under her shoulders, holding her close to his chest. His wings closed around them, embracing her in a powerful winghug. Their lips found each other, their tongues finally meeting as the world around her became filled by a familiar shade of green, all her senses assaulted by her son's body and scent. Posey screamed her orgasm into Zephyr's kiss, her vagina contracting and pumping, her experienced muscles milking the length inside.

Zephyr was filled with an unimaginable sense of relief as his balls raced upwards, contracting hard as his dick pumped their content into his mom. He could feel the first load traveling down his shaft, blasting from his flared tip and painting her insides white. Now adjusted, his second spurt was even larger, his thick semen mixing with the first wave as he filled her up. The third shot was equally large in volume, bringing her capacity to its limit.

Posey's mind erupted with joy as her son unloaded a fourth time inside her, her belly now slowly bulging outwards and rubbing against his. His fifth cumshot finally proved to much and their tight seal inside her gave way. A thick mixture of his cum and her maregasm sprayed from where their hips were connected, shooting from between his spread legs, drenching their intertwined tails as the rest splattered onto the floor below. Slowly the puddle spread to the middle of the living room, joining the one his sister had made just minutes earlier.

Slowly Posey's orgasm died down, her mind still foggy from her hard release. She open her eyes to find herself muzzle to muzzle with Zeph, the two of them unconsciously sharing their familiar breath. His member was still hard inside her, determined not to let any more of his foal batter escape back out. Over their labored breathing she could her their love juices dripping from their seat.

As Zephyr looked back at her with a lovestruck gaze she leaned back slightly, their sweaty fur sticking together at first. Both looked down expectantly at her tummy, now rounded with the huge load sloshing around inside, giving the impression she was already carrying young. Below her swollen midsection her impressive crotchboobs still clung to his body, her hard nipples playfully squeezing into him. And right in between she found the most beautiful sight she had ever witnessed. Her sons paternity mark sat boldly in the center, glowing and huge in size, announcing a very successful impregnation to the world.

Zephyr gently drew a hoof over his mark, caressing his new foal with soft strokes. Posey joined him as her other hoof cupped his cheek, bringing her sire back in for another kiss.

After a few more minutes of basking in each other's afterglow Posey broke their intimate cuddling. Carefully she lifted herself up before turning around on his cock, not yet ready to break their connection in case his swimmers decided to go for twins. Resting her back against his she rubbed their fur together, now in the perfect position to watch the second stallion in the room blow, as Zephyr coyly fondled her teats, trying to see if they were already lactating.

Right in front of them Fluttershy was getting the rutting of her lifetime, her body rocking on the floor as her head lay on its side, her tongue lolling out in a state of complete ecstasy. Above her Gentle had mounted his daughter completely, front hooves resting on her back, holding her down, while he pounded her raised plot, lifting her off her hooves with every thrust. Although her brain was shut off for the moment her instincts worked hard to ensure an optimal procreation, her dock keeping her tail dutifully out of the way as her hips tried pushing back against her father with each shove.

Gentle Breeze proved his name wrong once and for all as he bit down on her mane, pulling Fluttershy's head back hard, her mindbroken expression now aimed up at the ceiling. Unfazed, the stud hammered himself inside harder and harder, his ring already accommodated by her stretched foal hatch. With one final push he overcame her innermost barrier, bottoming out in his daughter with a proud whinny as Fluttershy came on his cock again, screaming her orgasm into the air.

His audience watched in stunned silence as her belly inflated outwards, racing towards the floor at an impressive pace. Gentle's orbs gave everything they had for his daughter's first creampie, flooding her fertile insides with the first few spurts. Once Fluttershy was filled to the brim, she too started to leak, semen shooting out from around the fatherly cock and completing the mixed ocean of cum between them. Satisfied, Gentle rode out his orgasm before slowly dismounting his new broodmare, his flared cock plopping out of her abused snatch followed by another stream of white liquid.

Fluttershy was not quite sure who or where she was, or why the warm feeling spreading inside her felt so good yet so bad at the same time. She pulled herself back up on her shaky legs, her hooves shuffling around helplessly as if she had just started walking. With no particular destination in mind she set off, her swayed step leading her in a sharp circle. Her backside was leaking a steady stream of cum, marking the path she had taken across the room. Her legs didn't comply for long, and just a few steps in they gave way, her body collapsing to the ground with a splash, her heaving side resting right in the middle of her family's love juices.

Said family watched silently as her fur slowly started soaking up their fluids, the scent so thick and heavy not even the strongest of rain clouds would be able to wash it back out. Posey was the first to move, pulling herself off Zephyr's softening member before stepping over her fallen daughter, inspecting her unconscious body. With squinted eyes she scanned her belly, scrapped off hoofful after hoofful of the slightly dried cum, coating almost all her fur by now. A sudden triumphant squeal prompted her mates to join her, and all three admired Gentle Breeze's three clouds, resting in between and slightly above Zephyr's marks, barely visible under her new coat color.

"Told her they would look good in a triangle."