Big Mac hesitated a moment before sliding inside his sister again, letting his warm, hard member grind over her croup. He was honestly getting quite tired after two rounds with the estorous filly, his balls starting to lightly ache, but he felt he had at least one more good one in him still. Plus, he’d be quite remiss if he were to refuse to get to take Applejack’s soft, warm, fertile pussy again. He ground for a while before hearing Applejack whimper and push her hips up towards him, letting it slide down, naturally following the curve of her stifle down to her marehood and lining up with her puffy, slick, and eagerly waiting vulva.

"Come an’ breed yer sister again, big bro. Ah’m sure you’ve got a little more in yer tank fer li’l ol’ me, don’t ya?” Applejack said, before performing a strong, prolonged wink that left her clit outside of her for several seconds against Mac’s flare, feeling him shudder atop her and making his member throb against her.

“Eeyup. One more creampie, all fer yer womb sis. Ah, uh, think this is th’ last one Ah got fer ya though…but what we already gave ya should be more’n enough to keep yer heat under control fer a while.” Mac said, and, wasting little time, Mac pushed his hips forward. Applejack’s lubricant and semen slicked, and slightly loosened, marehood gave no resistance as he pushed his hips forwards once more, taking in the sensations of again smoothly sliding into her pussy as she pushed back towards him, helping him slide inside her deeper and deeper.

Applejack's walls hugged around him, welcoming him in as much as their hips’ movements were, and Mac once more found himself in elysium. It didn’t take long for him to hilt her again, and when he again felt that ring he’d pierced twice before on his flare, he shuddered pleasantly as he let his tip once more kiss the mouth to her fertile womb. That feeling still sent shivers down his spine, knowing that what lay beyond was where a foal could one day grow. His foal. He could make a foal with Applejack right now…and probably, he didn’t realize in his altered state, already had, just thinking it was all sexy talk.

Applejack felt her mind buzzing with pleasure, her inner muscles clenching down on its guest, her head easing back so it pressed against the side of her brother's chest and neck. "Hmmm…’at's what Ah needed...a big, thick colt-cock spreadin’ me open again, by a big, strong stud ready ta breed me ‘gain..." Applejack moaned out, squirming her hips to try and wriggle his dick just a little deeper, despite him being hilted to her core already. His flare was pressed firmly against her dilated cervix, her body all relaxed and eager to take in all his sperm once more. "...now squirt a strong, healthy foal into meh, bro. Give yer sister a baby!"

Big Mac was almost in disbelief as he heard what his sister had just said. Him and Braeburn had already pumped enough cum in her to knock up a whole herd of fertile mares, and she still wanted more. Shaking his head at the notion, he huffed, pulling out, before slamming back balls deep into his sister, hearing a muffled cry of pleasure from her as she had bit her foreleg to try and avoid waking Braeburn, before pulling out and repeating the rough thrust, again and again. Despite the ache growing in his haunches and hind legs, more with each hump, he couldn’t deny the pleasure of breeding the young mare again.

Applejack enjoyed the increasingly-rough fucking, trying to will her marehood to be wetter and tighter, squeezing down each time her stallion hilted inside her, keeping clamped down as he tried to pull back out and making it that much more pleasurable for them as he did. She groaned out as his flare once more roughly kissed her core again, feeling a mini-orgasm as he licked her sweaty neck, her vaginal muscles clamping down twice involuntarily on him as she squirted on his balls, if just a little. Her body gave her a taste of the pleasure that was to come, once she let her heat be fully satisfied the way it demanded of her; once she made her stud cum again, then let the worthy young stallion's seed take, and give her a foal.

Big Mac kept pumping his sister with all the, if fading, gusto he had left, each thrust causing his stamina to fade more and more, until he had to start resting more of his weight on Applejack’s back just to ease the strain on his wobbly back legs. Still his instincts demanded he keep going, Applejack’s scent still in his muzzle and wrapped around his brain, driving him to hilt and pull out again and again, despite how much his rump ached from his previous times’ effort.

Applejack moaned out again in a dreamy tone as that big cock kept plumbing her depths, with a desperation a colt or stallion could only get from fucking a mare or filly in heat. The urge to plant his seed, and claim her womb as his foal's vessel for the next year. It wasn’t long until Applejack felt as his flare got even bigger in her, then his cock stiffened more, his hips hiking up to hers and burying every centimeter of his dick into her tract. Once more almost ready to deliver his seed right where it was needed most again: where it most belonged.

"S-sis, Ah ain't gonna be able t' keep goin' much longer..." Big Mac admitted, feeling his orgasm welling up inside him as he flared, but also a wave of fatigue washing over him. He was never one to leave a job incomplete though, and so pressed on, getting those last strokes he needed to finish.

"H-hah...yes…do yer natural duty. Breed your sister, one last time…" Applejack whispered breathlessly, her heart pounding as she encouraged her brother, and she felt so wonderful as she felt that exquisite expansion of his flare deep inside her, as he once more started to rhythmically pulsate within her.

Her breath caught in her throat as Applejack felt his seed-heavy balls hitting her clit, and combined with his flare entering her womb itself again, that last burst of sensation set her over. Applejack covered her muzzle with her forelegs and let out a long, squealing whinny as she came, her body clamping down on his swollen cock, her uterine walls grasping his flare to keep him locked inside, her cervix clamping behind it, and the rest of her passage trying to knead the sperm from him and into her fertile, waiting womb. And it wouldn't have to wait long.

Gripping tighter around Applejack, Mac gave a particularly rough thrust in, giving a groan as his muscles protested at the overexertion with a sharp burst of pain. He'd be feeling this tomorrow, no doubt. Still, that was the last thrust he'd needed, his flare pressed firmly to the back of Applejack's womb and at its fullest as he felt that involuntary pulsing start in his pelvis again.

Her heart sung out in joy as Applejack felt a familiar warmth hit her deep inside again, each weak shot of the life-giving goo he ejaculated within her pooling with the rest, quelling the smoldering remains of her estrus' burning. "That's it, bro...gimme all ya got left."

"E-eeyup..." came the colt's weary reply.

Big Mac collapsed onto Applejack's back, his head beside hers as he pumped the last of his semen into her womb again, though it was mostly just watery squirts at this point after a couple last half-decent shots, his reserves completely dry, already having been emptied into his sister's womb before. He felt the pleasant pulsations and rush of endorphins as he once more seeded his mare, the pleasant squeezes of her canal around his cumming shaft, but under that sensation was an overwhelming fatigue, with him panting heavily as his penis once again stilled and his flare plugged up his load within his sister. He could feel that he was utterly and truly empty, having given his fertile filly every drop he had, and her taking every one, with Mac feeling some pride about that.

Applejack was breathless as she felt pleasure like never before roll through her while she took her final in-estrus creampie without protection, her whole body trembling as her orgasmic clenches started up again, albeit weaker than before. It was so much more intense, instinctively knowing she was going to get pregnant from this, that all Applejack could bring herself to do is hold still beneath him as her instincts demanded her to do and, like a good mare following those needs to be seeded and bred, Applejack accepted his last paltry load into her womb. Accepted his foal.

"I think that'll do it," Applejack said as she smiled brightly, despite, as the endorphins and breeding urges were wearing off, her pussy and belly started to ache. Not really too painfully, though, more of the ache of a job well done; a satisfying ache that told her she'd done well. She sighed in satisfaction, her soothed nethers purring with the same and her mind crystal clear. She nuzzled against her brother's cheek, giving a soft 'mmm' as she enjoyed her afterglow.

Mac felt his colthood go soft faster than ever before as it slid from his sister and back into his sheath in record time, his legs feeling like jelly and his whole haunches and hind legs screaming in pain. He'd definitely overdone it. He hoped he could still work the next day. "Y-yeah...don't think Ah'm gonna be able t' do any more fer ya tonight…an’ maybe not even tomorrow. Ah...that's all Ah got in me." Big Mac said some time later after catching his breath, with it taking all his flagging strength to haul himself off Applejack's back and onto the bed, lying there bonelessly as though Applejack’s foal-canal had sucked his very soul from him that last time.

“Awww,” Applejack said with some disappointment, but despite her mind demanding her to breed with more, and more, and more stallions - or colts - she could tell her body was pretty much done for then, and the unpleasant sensations of her estrus was a distant memory, the emptiness, the itch and burn long since replaced by the filling, soothing warmth of colt cum. It wasn’t long before she heard a quiet snoring coming from beside her, not at all surprised to see Big Mac had fallen asleep as well. After all that, she figured he’d more than earned his rest after all he'd done for her already.

She reached down and rubbed a hoof over her marehood with a soft hiss, feeling a slight stinging sensation as she touched her overused lips, though coming back with what she’d sought, smiling softly at the sight of her big bro’s colt-milk coating her hoof. Licking it off, she sighed happily as she snuggled up against Big Mac. Laying her head on him and burying her muzzle into the fur of his chest, she took in her stallion’s comforting scent, before letting her eyes flutter closed, she was oblivious to the small pinprick of pain in her belly as she’d ovulated while she’d drifted off to sleep.

As Applejack had finished her story, she looked over the room of now-aroused ponies - mares and fillies with puddles of arousal under them, and colts with full erections hanging beneath them - Applejack leaned over and gave AB a kiss on the cheek. "The next mornin’, Ah woke up to mah panties missin’ an’ Braeburn jackin’ off while sniffin’ ‘em, then led to me presentin’ to him, an’ him mountin' an' cummin' in me again. They kept breedin’ me over th’ next several days, at least three ta four times a day each colt, ‘til mah heat finally died out."

"Over th' next couple months after, though, Ah started feelin' funny; stomach-sick durin' th' mornin', bloated, hungrier by th' day. Mah lower belly kept gettin' bigger. That's when Ah realized either Big Mac or Brae-Brae had likely actually gotten me pregnant. Made perfect sense: Ah was in heat, fertile, an' likely ovulated while havin' sex so many times with 'em…takin' so much cum an' so many sperm in mah womb durin' th' deepest part of mah estrus…so it only made sense Ah'd get a foal outta it.”

Apple Bloom had known Applejack was her mother for years, and didn't really care. They acted like sisters in public, even if where she'd actually come from was fairly well-known in Ponyville. After all, it had always been fairly normal among earth ponies especially to have incestual relationships - given their powerful breeding instincts, the convenient closeness of their family members to cure their estruses or ruts with, and the fact their numbers were so limited at one point, encouraging their population increasing, no matter who bred with who - so it wasn't at all unusual to get a foal from their family either, and especially not during a filly's first, most intense heat. It was less common in modern times, given the abundance of ways to prevent an unexpected foal, but it still happened sometimes.

"Turns out Big Mac's sperm was th' one that impregnated me, accordin' to a paternity test we took, an’ probably on that first evenin' too. Unsurprisin', given how much he’d flooded mah womb compared to Braeburn’s li’l cumshots in there," Applejack said to her niece-daughter, giving her a hug and nuzzle. "As it turned out, Ah did get pregnant. Ah got you Apple Bloom, mah beautiful li'l filly." Apple Bloom smiled and kissed her mom back.

The other mares, as well as the fillies Sweetie Belle and Scootaloo, had known this for years, and were pretty nonchalant about it. The colts, however, were quite surprised at the revelation, especially Tender Taps, whose fillyfriend it was that he’d just learned that about. They all found the thought of incest, and foals being born from it, a little strange at first, but since incest and incest foals were generally accepted in most pony societies, they dismissed it as mostly-normal.

Rainbow had been rubbing herself, giving quiet little moans as she stimulated her needy pussy after such a sexy story about Applejack's first times. She was giving little whimpers of want as she rubbed her winking clit, her hoof slickly sliding over her slit, sending tingles through her body. Her unintentional show - and scent of arousal and estrus - didn't go unnoticed, especially not by the colts, their eyes locked onto that puffy, wet, deep-blue marehood being rubbed. "H-heh AJ? A little help?" Rainbow all but begged as she looked at Applejack, getting a knowing smile from the beckoned mare as she released Apple Bloom from the hug and went to her heat-buddy in her time of need.

"'Course, hun. Ah got ya. Ah’d never leave mah heat-buddy hangin’." Applejack said, approaching the deeply-needing, and blushing, mare with a sexy grin on her face.

Author's Note

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And thus concludes the first book of the series we're working on. Hope you liked it! More coming soon, hopefully!

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