A Womb's Filling Eve

"Ah buck, how are you still so tight?"

"Shhh, quiet Zeph! Mom and Dad are right next door."

"Don't worry sis, they won't hear us, your creaking bed is far louder than me."

"Groan."

Fluttershy instinctively tried to facehoof herself for the umpteenth time this weekend. She could however not quite reach around her brother's head as he affectionately nuzzled her neck and chin. Zephyr was busy on her other end as well, steadily pounding her plot deeper into the mattress.

Normally such lewd acts were completely out of the question for the young pegasus. She had made it clear to her every horny brother years ago that if he wanted to bury his admittedly impressive cock in another pony he would need to find a marefriend for himself. At most she would blow him to get rid of a particularly persistent case of morning wood, or maybe give him the occasional wingjob before bedtime, but that was it!

Unfortunately this was no ordinary occasion, as they had both been invited home to their parent's annual Hearth's Warming Eve celebration. And in an unfortunate moment of cider-fueled horniness the evening before the holiday Fluttershy had decided to give her brother a special gift for the occasion.

Now there she lay, on her old bed in her old room, buried beneath Zephyr's heaving body, trying her hardest to keep her pussy from twitching every time her brother's medial ring slipped inside. In an attempt to distract herself she recalled the previous evening, what events led her here, pinned down under an all-too familiar pegasus.

Once he had discovered what his sister's mysterious present actually was, he had been quick to drag her into her bedroom and in his favorite position. Her ass right at the edge of the mattress, his hind hooves were now clattering on the wooden floor as he drove himself over and over inside her. While he was belly to belly with his mate and in the ideal position for a deep fucking, Fluttershy could only hold on to his sides, her legs rising up helplessly as she lay on her spread wings.

After her hushing the room lay in relative silence again, at least if one ignored the creaking springs and groaning frame below her, the clicking of excited horseshoes on a hardwood floor, the labored breathing from above, the slapping of heavy balls against a wet pussy and the occasional soft moans that definitely didn't come from her. Now that she thought about it, she was more than relieved that her parents also had their fair share of festive beverages that night.

For all his quirks and flaws Fluttershy could understand less and less why her brother was still single. Not only was he impressively endowed but his stamina could have led anypony to believe that he had far more experience than just with his sister's socks. His technique didn't lack far behind either. He hadn't wasted any time on foreplay, rearing up right away and resting his hooves on both sides of a by now clearly regretful Fluttershy. More than ready, his horsecock had already slipped out of its sheath, growing to its final size while eagerly slapping against his belly. He hadn't slipped it in right away, taking this rare opportunity for a quick teatfuck between her petite crotchboobs. Humping back and forth his length and her fur quickly moistened with clear precum.

"Sorry Flutterbutt, your rump is amazing, but we'll have to work on your milkers."

"Oh, and how will we do that?"

"Leave that to me."

Before she could inquire further, he pulled back, aiming down and placing his unflared tip right against her entrance. Only now did Fluttershy realize that she was actually quite clenched down there. Maybe because she was about to be rutted for the first time or maybe because it was her own brother who was about to take her virginity, but suddenly the alcoholic confidence boost was replace by a familiar shyness. She tried to relax, taking a deep breath to lose the tightness that had gripped her body, but her marehood remained firmly closed.

Panic started to well up inside her. Here she was, presenting her drunk and horny body to a stallion and now she bucked it all up.

Her rescue came sudden and totally unexpected. Her eyes focused on the pony right above her, were a momentarily forgotten Zephyr was now looking directly at her, gazing deeply into her eyes. His hoof against her face, a soft frog gently caressed her cheek.

"Hey sis."

"Wuhh?"

Before her mind could catch up he moved down, planting his mouth across hers. Her eyes flew wide open at the sudden display of intimacy, her body reacting on its own. Her mouth opened, welcoming his tongue as it went exploring, playfully wrestling with her own as their breaths started to mix. His saliva tasted somewhat familiar, and not at all like the times he had nutted inside her mouth. It was more calming, more relaxing.

And relax she did, as her marehood finally twitched. Her own juices started to flow as her muscles folded outwards, exposing her clitoris to the outside world.

The dick right below used that opportunity. The tip had continuously kept up the pressure and now that the resistance faltered it went forward. Zephyr's dick parted his sister's folds as he sunk right in, their natural lubricants mixing together as he pushed deeper and deeper. Her clit winked furiously against the thick cock rushing past, and the feeling momentarily took Fluttershy's breath. Her brother broke the kiss, admiring the stunned look on her face as he paused his advance.

"Didn't think I'd be this big, huh?"

"Just shut up and buck me."

"No problem sis."

With that he pulled back, almost popping out of her before reversing course and slamming back in, his thrust only stopped by his medial ring hitting her pussy lips. Burying his muzzle in her lush mane, he repeated this motion, settling into a steady pace as he pounded her over and over again. Fluttershy rested her head back on the mattress, looking past the aquamarine pony on top of her, studying the ceiling while trying not to enjoy their incestuous rutting too much. She had to admit, being firmly sandwiched between her soft bedding and a warm body above felt kind of nice, safely locked in place as she was free to enjoy the ride.

A loud grunt snapped her out of her thoughts. Zephyr dug his hooves into the ground as he pushed forward again. With an audible pop his ring finally made it inside, stretching Fluttershy's vulva wider than ever before. The sudden stimulation was too much for her. Before she could react, her pussy tightened, and a spurt of marecum dampened Zephyr's crotch. Only the huge wave of fresh pheromones hitting his nostrils prevented him from making any snarky comments. Instead he took his sister's physical reaction as a sign of encouragement and adjusted his technique, letting his ring pop in and out with each deep thrust.

Slowly his cock worked itself towards his little sister's womb, every move forward stretching her walls just a bit further. Her pussy was like a vice, clenching down around him, almost like she wanted to hold him in every time he pulled back.

"Ah buck, how are you still so tight?"

Back in the present Fluttershy now had to face an unpleasant reality. The fat horsecock inside her would make her cum.
Hard.

And judging by the tingling feeling in her nether regions that would be pretty soon. Somehow she needed to convince Zeph to switch holes. Finishing him off with her mouth was no problem. Even her ponut would be fine now. Anything to avoid creaming herself on her brother's cock. He would never let her live that one down.

"H-hey Zeph, mind switching position for a bit? I could do that thing with my tongue you like so much."

"Nu-uh, I like your present just like that."

Buck.

Alright, she just needed a new plan. Simply let him have his fun a little longer. Then let him cum on her teats or wings or wherever, get a quick shower and this bad idea would finally be over. That simply quickly turned to not so simple at all as Zeph's shaft used that precise moment to make contact with her cervix.

Fluttershy drew in a sharp breath. His broad tip kissed the beginning of her womb once, twice, three times, demanding entrance to his final goal. The feeling was unlike anything she had ever experienced before. No clopping hoof or soft wingtip could ever recreate the burning sensation raging deep inside her right now. She was approaching her limit fast, and her options were limited.

Desperately she tried to focus on anything else, the soft fur rubbing against her entire body, the spicy musk in her nostrils, the gentle nibbling on her right ear. Not very helpful. With all her remaining strength she half muttered, half moaned her final warning.

"Zeph, I-, ah, pull out. Don't cum insiii-"

And with that thought in mind she went over the edge. A searing heat shot down her spine, lighting her privates on fire. Her pussy convulsed, milking the cock inside for all it was worth, desperate to quell the burning feeling deep down. Her cervix obediently gave in to the assault, opening up and allowing the eagerly waiting dick inside.

Zephyr was finally able to bottom out, sinking himself fully into his sister's quivering pony pussy. His balls lewdly slapped against her ponut, filled to the brim with his virile seed. Further inside his tip flared up, tightly sealing the entrance it had just went through, trapping itself in his sister's fertile womb.

Fluttershy was in a world of bliss. Her entire body tingled and shivered as sweat ran down her face, mixing with her lover's as she nuzzled him unconsciously. Riding out her first ever proper orgasm she ground her pussy against his base, eager to get as much pleasure as possible. Her vagina was hard at work as well, squirting out wave after wave of hot marecum, drenching his balls, crotch, tail and everything else around them.

As her high finally waned, a warm sensation spread inside her depths, making her feel content like never before as she basked in her afterglow. It spread and spread, slowly expanding her belly-
Wait a second.

"Zeph!"

"Yeah, Sis?"

"I told you to pull out!"

"I will, just a mommh-"

His cock pulsed again, another thick load traveling down his length, spraying from his tip and mixing with the sea of foal batter already inside. Her vagina was not helping either, muscles still rippling as they milked his member completely dry. Zephyr made a few more short thrusts, making sure every last drop was safely inside his mate before Fluttershy finally found enough grip on his sweaty sides to push him back.

With a loud pop his flare came loose, his flaccid penis quickly exiting her now widened vagina. Fluttershy rapidly sat up. Desperately pawing and squeezing at her privates she realized in horror that there was nothing she could do against the cum inside her, not even a single drop dripping back out. Her own womb had sealed itself quickly, and with it her brother's creampie and her own fate.

"Oh buck oh buck oh buck. Zeph, what in Celestia's name have you done?"

"Heh, sorry, got a little carried away there."

"Think, Fluttershy, think. There is still time. That's it. Zeph, come here!"

"Umph-"

Her brother was suddenly greeted by a sloppy horsepussy to the face as Fluttershy had a hoof on the back of his head,
forcing him to sit down in front of her and pressing his muzzle into her crotch.

"Use your stupid mouth for something useful for once and suck your cum back out. If you're quick we might still be safe."

Zephyr didn't need to be told twice. Eager for his second gift that night he place his lips against her lower ones, suckling and licking her wet love channel. Truth be told, he didn't see how this would solve anything, but if his sister told him to eat her cunt, so be it. Savoring her taste he twirled his tongue inside her snatch, smirking as her nervous ramblings from above were interrupted by little eeps.

The flavor on his taste buds was familiar, but more in a eating-your-own-sis-out fashion, not in a tasting-your-own-nut one. A sudden flash of bright light made them freeze in place. Looking at Shy's belly, they both saw an intense spot of white shining from between her belly button on right teat. As fast as it had appeared it was gone again, and in it's place sat a perfect replica of his own cutie mark, proudly announcing the father of the newly sired foal to every onlooker.

A moment they both gazed silently at the majestic sight. Then their eyes met. Fluttershy's look wasn't even all that angry, just very very annoyed. Sitting on her bed, looking slightly disheveled, she waited for any reply or suggestion, as little as it could do now.

His dick sprung back to life, growing from between his legs and plopping onto the floor.

"Well, now I'm horny again."