Estrus among us

"Ah'm comin' with you! She's MAH sister too!" yelled Apple Bloom. But Big Mac's mind was made up. He turned and faced her squarely.

"YOU. Are stayin' Right! Here! Little filly, and that's final!" Mac glared down at her and waited.

Apple Bloom cowered before his anger and stepped back. In her short life, she couldn't count on all her hooves the number of times Mac had ever gotten angry with her or raised his voice...she never wanted to see that again. But she was so worried about her sister she had to say something... "Mac...I..."

Granny spoke up. "He's right, baby...this is gonna be 'grown-up' stuff he's dealin' wif...yer too young to be involved yet." She looked up at her grandson. "Jus' make fer dang sure she's alright, an' hurry back an' tell us, y'hear?"

"Yes'm," replied Mac. He spared a moment to lightly run his hoof under Apple Bloom's chin, then set off for the Human's house. His face was a mask of determination and barely restrained fury.

Friend or no friend, if that creature has hurt her, he won't ever touch nopony again!

Pinkie's hooves had carried her out into the early morning, and as far as Ponyville Square, but now she was at a loss where to go next. She vaguely recalled hearing an earlier loud noise coming from somewhere in the direction of the Everfree, which was also close to Alex's house, so, having no better plan, she began trotting in that direction.

As she was going along, she looked up and spotted a red stallion far in the distance in front of her, coming from the opposite direction. "Big Mac!" she called out, as she quickened her pace. "Where you going?" as she caught up with him.

Mac looked down at her. Normally, the sight of any of his sister's friends would put a smile on his face, (especially the cute yellow one!) or at the very least lighten his mood...but not today. "I got some Family business to attend to, Pinkie...you might wanna stay out of it."

"But I am Family, silly!" replied Pinkie. "And my Pinkie-sense told me something is wrong today, and Gummy confirmed it! So I'm coming with you!"

Mac stared at her as they went along. "Gummy did wha...you know what? Never mind. Just...let me do the talkin' when we get there, okay? This might get...violent..."

Pinkie's eyes grew wide. "Violent? Where exactly are we going?"

Mac looked straight ahead. "To Alex's house. I'm thinkin' that's where we'll find AJ, and that's where I'm hopin' she's alright." He took a moment to look down at the pink mare, and the expression on his face made hers lose color. " 'Cause if'n she's not, an' he had somethin' to do with it, it ain't gonna be pretty..." Pinkie swallowed and shut her mouth, walking beside him silently until they reached the alien's home.

Once they were within a hundred yards of the home, they both stopped as they heard a familiar female voice cry out, "Don't! Stop!" They both looked at each other, knowing full well what they were hearing. Mac grit his teeth and started forward, but Pinkie ran in front of him and cut him off. "Mac! Please! I know how you feel about Fluttershy!" Mac startled and looked at her, and began to open his mouth, but she stopped him again. "We all do! But you never made a move on her, and she got tired of waiting! Please don't do or say anything you might regret!" She looked back at the house, then turned back to the angry stallion. "Let me handle this! Now we know Fluttershy is in there, so if Applejack is too, our search is over! Just...take a deep breath, and wait out here...okay?" Big Mac was still seething, but he slowly nodded and sat down. Pinkie sighed, smiled, then turned and approached the home.

Once she finally reached the front door, she stopped and tuned her ears for the sounds of any more...well...fucking going on. Satisfied it all seemed to be over, (for now, at least!) she raised her hoof and rapped smartly on the door. She heard scrambling, frantic voices, then finally heavy footsteps approaching. Once the door opened, she looked up and up to see Alex standing there wearing both a bathrobe and an odd expression on his face. "Oh. Hey, Pinkie. What brings you by so early?"

"Morning, Alex!" she replied brightly. "Mac and I were looking for Applejack!" She turned and waved at the stallion. "Hi, Mac!" who took that as his cue to come forward. She looked back up at Alex. "Have you seen her?"

Alex began to visibly sweat. "Umm...well, yes and no..."

Pinkie's face fell. "What is that supposed to mean?" she asked in a flat tone. Alex turned and looked back over his shoulder for a moment, then turned back to Pinkie, just as Mac was joining her.

"She is here, but...maybe...it's not a good idea to see her right now?"

Mac started forward. "Get out of my way, Alex! I need to see mah sister!" He pushed bodily past the Human and looked around. "Applejack! AJ! Come on out here!"

A timid voice called down from upstairs. "M...Mac? Ah...Ah'm here...but...Ah...don't want you to see me yet..."

Mac began to climb the stairs. "Why not? Is you hurt? Tell me what's wrong!!"

His sister peeked her head around the corner, making sure to keep the rest of her body behind the wall. "No, Macintosh! You stay downstairs, y'hear?" Ah'm fine, I just...don't want you to see me...just yet..." Mac stared up at her.

"Somethin' ain't right." He squinted up at her. "Why are you so...tall?" He took a few more steps closer. "An' why is your voice so...different?" A voice behind her spoke up.

"We might as well show them, Applejack. They all will find out soon enough anyway." An unexplainable sense of dread came over Mac as he heard the two mares start to descend the stairs, as his balls drew up, his eyes widened and he backed down the stairs. It was only hours later that he realized his hindbrain had immediately picked up on the fact he was hearing the steps of two-legged creatures, just seconds before he saw them.

"N...now Mac? Don't freak out...okay?" asked his sister. He heard her take a deep breath, then she stepped into view.

"MAC!! Ah told you not to freak out!!" screamed Applejack, as she stood between her brother and Alex.

"YOU!! YOU DID THIS TO MAH SISTER!!" bellowed Mac, as he tried to get at the alien.

Putting forth all his weight and strength, he lunged forward, trying to get past the mare, but she cried out, "NO, Mac!" caught him around his barrel, and lifted him off the floor!

Mac struggled in her grip, but it was like her arms were made of steel. "How...how are you...?" he began, but she simply carried him over to a couch and set him down. He gazed up at her in awe. She wasn't even breathing hard...

She sat down next to him, but he shuddered and moved away. Hurt, she said, "Look at me, Mac." But he put his head down and shook it.

"I...I cain't. It ain't natural!" He cast an unfriendly eye up at Alex, who had recovered from the near-assault and was talking to an awestruck Pinkie and a serene-looking (naked!) Fluttershy. "What did he do to you? To the both of you?!"

"We don't know. All we know is, after last's night's...err..."fun"...me an' her woke up like this."

Mac turned and looked at her briefly, then turned away again. "Granny's gonna pitch a fit..." he said under his breath.

Applejack started to put a hand on his knee, but then withdrew it at the last moment. "Do yah gotta tell her? Ah was hopin' Twilight could find a cure afore Ah had to let Granny an' the rest of the family know."

At this, he did look fully at her. "You mean Apple Bloom. They deserve to know, AJ, an' if'n yer still an Apple you'd understand that!"

Applejack scowled, then stood to her now full, imposing height. "Don't. You. EVER! Call mah Family ties inta question!!" She leaned down into his face. "Ah don't care whut Ah look like, nor how Ah've changed, Ah will ALWAYS be an APPLE! You hear me?!" Mac's eyes were as wide as dinner plates as he shrank back into the couch and nodded. She stood over him, her chest heaving, while the rest of the room had gone completely silent.

"Well!" Pinkie piped up. "Who's ready for breakfast?"

With that, a great deal of the tension was eased, as Alex and AJ chuckled, and made their way over to the dining table, while Pinkie set herself like a whirlwind in the kitchen. After about fifteen minutes, Mac sullenly got up and joined them, sitting as far away from the Human as he could, seated between his sister and (the still naked!) Fluttershy. In a flash, Pinkie spun plates full of scrambled eggs with cheese, toast, and buttermilk pancakes with butter and syrup down for every...creature...then after bringing the coffee pot over she plunked down next to Alex. "Dig in, everypony! I mean...creature!" said Pinkie.

For the next few minutes, the only sounds were those of munching. All had almost finished eating, and Alex had just taken a hearty sip from his cup when Pinkie brightly asked, "So, Alex! How soon can I get you to stick your cock in my ass and make ME a Human?" Alex spit his coffee out and began choking, so she had to smack him on his back, as everyone else began talking at once.

"Are you crazy?" yelled Applejack.

"What's wrong with you?!" yelled Mac, as he stood and pushed his chair back.

"We don't know how they changed, Pinkie! It was an accident!" cried Alex, after he'd regained control of himself.

Fluttershy simply smiled.

Pinkie turned to each and addressed them calmly, one at a time. "I'm not crazy, there's nothing wrong with me, and I think it would be worth the try! I'd love to be a Human, at least for a little while!"

Applejack tried again. Taking a deep breath to settle herself, (and through clenched teeth) she growled. "Pinkie. We. Have. NO IDEA, if this change is permanent! We could be stuck like this...FOEVAH!"

But Pinkie just waved a hoof dismissively. "Pbbbt! You forget how much of a smarty-pants Twilight is! She'll have this thing figured out before lunch!" She then turned bedroom eyes up at Alex, leaned in close, and ran a hoof softly along his thigh. "So in the meantime, I have a great idea how your dick and my ass could get to know each other better for the next hour or so..."

Alex looked down at her and swallowed, and was just about to say something when suddenly they all heard a commotion outside one of the windows. Every creature shared a nervous look before Alex leapt to his feet and dashed to the door. Flinging it open, he barely saw a tail disappear from view as its owner bolted down the road and out of sight.

"Oh...crap..."

The mare ran as if The Dark Pony Himself was hot on her flank...she'd never been more terrified in her life!

Freaks! That house was full of...freaks!

Rose didn't stop until she'd made it to her home, crashed through the door, slammed it, bolted it, then dashed down into the underground shelter. After taking a few precious seconds for the facial software to recognize her and allow her entry, the mighty doors opened and she dove past them as they sealed with a >hisss!< behind her. She yawned to equalize the pressure in her inner ears, then quickly jumped into the decontamination shower and set it to full force. Once that was done, she ducked under the turbo wind jets, which dried her fur in moments. Going into the next room, she donned her best hazmat suit, then slammed her hoof down on the emergency alarm. Immediately, adamantium steel shutters crashed down over every upper window and door, each window sealed itself from the outside air, and several generators thrummed to life, powering up the air purifiers and purging her home of all airborne contaminants. She anxiously watched the readouts as they all slowly went from red to green: "Come on...come on!" she muttered, tapping her hoof. With a >ding!< all showed :CLEAR: so her next protocol was to warn her sisters in their homes, which she did by rushing past the security personnel to her main situation room, booting up the Cray supercomputer at the primary console and typing in the appropriate commands to the current R.O.S.E. satellites in geosynchronous orbit. As soon as their worried faces in their own hazmat suits appeared on the giant digital screens, she told them everything she'd seen while she'd been stalking the Human.

Everything.

Within a few hours, the entire Town was abuzz with the news: At least fifty more Humans had been seen at the first alien's home, and Ponyville was now facing a full-scale invasion! Worst of all, these new aliens had pony faces, so they were some unholy mix of the two races! Anypony and everypony that had had any contact with the Human could be a carrier!

Nopony was safe!!

...aaaand the entire Town was sooo used to the Flower Trio's constant panicking, that few paid much attention to their latest ravings. To be sure, the thought of more aliens was an interesting prospect, but few ponies outside of Rose's circle were upset about it. Some were even a bit turned on at the thought of having MORE Human dick to go around, especially from those who were still trying to figure out ways to get around Twilight and her skanky friends!

Among those mares that were excited at the news, Lyra was definitely one of them!

All these weeks, she'd kept her distance from the Human, out of respect and love for her marefriend, and because of her behest. But now? The possibility of there being pony-Human hybrids meant one of two things: either another race had entered Equestria, orrrrr...(and this one was the scenario she was hoping for) this Human's magic had somehow found a way to temporarily alter pony DNA to resemble his! She ran upstairs to her shrine and tore through her books on known cases of Human magic and history until she found the example. She squeee'd and danced in place once she found it, holding the Book to her chest! It was true! Humans have done this before! Sadly, the effect lasted at best for only a day or two (according to her Book) but What. A. Day!

Then...she stopped...and stood completely still as her face fell. There was now only one problem.

Convincing Bonnie to let her try it.

Twilight was just leaving the Library, scrolls and various notes stuffed in saddlebags (as well as all her Number One Assistant could carry!) and on her way to Alex's house when there was a knock on the front door. Spike said, "I'll get it!" set his burden down and opened the door. There stood Lyra...and behind her was Bon Bon.

Lyra was holding a Book open to a certain page as she said, "Your Highness? I heard what was going on. I...we...are here to help."

Twilight's eyes grew wide. "You...know?! I couldn't find anything about ponies changing into Humans in any of my books! We were just on our way over to Alex's house to see what we could do on our own..."

Lyra smiled. "It's no wonder you didn't find anything, Princess." She turned the Book around and showed her the page she'd marked. Twilight's eyes grew wide as she read, then started to say something, but Lyra held up a hoof. She leaned in close and lowered her voice to a whisper. "It's ancient Magic and...well...considered...taboo." She looked around. "Maybe we should come in to discuss this?"

"First of all, I feel I must apologize, Lyra," said Twilight. They were all sitting around the dining room table sipping tea, while Spike bustled in and out of the kitchen serving them. "I should have gone to you at the very first when Alex showed up; I had no idea you had such a vast store of knowledge concerning Humans."

Lyra blushed and looked away. "Please don't worry about it, Your Highness." She gave a lopsided grin. "I know most ponies consider me a 'kook.' But, yes, on this subject, I am quite adept!" She spared a glance at her marefriend. "And this is an opportunity for which I have waited my entire life!" Then she leaned forward eagerly. "Now, bring me up to speed on everything that's happened with the Human since he got here! And don't spare any details!"

Twilight's face burned bright red as she stammered, "Uh...umm...every detail? Even...the...intimate...ones?"

Lyra's eyes glistened. "Especially the intimate ones!!"

Big Mac was in turmoil. Every part of him (well...almost every part!) was telling him this entire situation was unnatural, wasn't right, wasn't...moral. He'd stayed at the alien's home all this time only because of his sister, and only because he was worried about what else might happen to her if she left her alone with...him.

But then...then he'd catch himself giving brief glimpses at...Fluttershy...then quickly looking away! Why in tarnation does she have to walk around naked?! Then he stopped himself. Wait...I'm naked. That...that's how ponies are supposed to be, most of the time... He looked at her again. This time, she noticed, then smiled and waggled her fingers at him. He blushed bright red and looked away, trying to sort out his feelings. "How...how kin I be...attracted to her? She ain't a pony no more...is she?" he thought to himself. He put his head in his hooves to stop the spinning.

Outside, a small group of ponies (mostly mares) had gathered when word had spread that there were more tasty Humans to be had. At present, they were all relatively peaceful, but the mood was changing as time went by, and they still were being ignored. Alex stood by one of his front windows with the curtains drawn, peeking out at them, being careful not to let any of them see him, while Applejack and Pinkie stood beside him. He turned to the mares. "So...now what do we do?"

Applejack shrugged. "Ah guess we wait. If'n them ponies know about us, then fer sure Twilight has heard by now; she'll be on her way soon."

While Mac was sitting there with his head in his hooves, the picture of misery, he suddenly felt a weight press down next to him, and then something warm drape over his shoulders. He startled and looked up into the smiling face of...Fluttershy? Her eyes sparkled as she met his gaze, "Mac, you just look so unhappy. Is there...anything I can do to help?" He started to pull away but stopped himself. Her wing over his shoulder just felt SO. GOOD! he never wanted her to leave!

His heart beating like a rabbit, he blushed and said, "I...I always want...wanted to...tal...talk to you, Miss Fluttershy...but I...never could find...the nerve..." He sighed and continued. "But now? Now...you ain't even a pony no more...I don't know what to think..."

Fluttershy smiled, leaned in close (which made him blush even harder...as well as making something else harder! wink wink nudge nudge), and whispered, "...but do you still think I'm pretty?"

Mac's eyes grew wide, and without further hesitation, he blurted out, "Mah GAWD you ain't just pretty, you're BEAUTIFUL!"

Fluttershy smiled once more. "Good enough for me," then got to her feet and started for the stairs. She took a few steps then looked over her shoulder. "Coming?" Mac scrambled to his hooves and followed her bubble ass up the stairs, down the hallway, and into the bedroom. By the time they got there, he was as stiff as a flagpole, and wondering to himself how he got into this situation. Then, just before he climbed up on the bed, a thought occurred to him: this is the same bed his sister had sex in...and he almost shot his load right then and there!

"Sit up and face me..." whispered Fluttershy, as she fell to her knees in front of him. Mac sat up and spread his legs, his mottled cock standing tall and throbbing before her eager eyes. She gently grasped it with her Human hands, which caused a warmth to radiate from his cock to his balls and throughout his body, as he gasped and moaned from her mere contact. Fluttershy raised her eyebrows. "Just my touch felt that good?" He weakly nodded. "Interesting..." Keeping her eyes on his face, she slowly brought her mouth forward and licked the head, causing a spurt of precum to appear. She wrapped her lips around the head and suckled it up, then drew her head back, closed her eyes, and swallowed. "So good..." she moaned. "I need more of that!" Again, keeping her eyes on his face, she then took him all the way into her mouth, then swallowed his cock into her throat, and began bobbing her head up and down.

Mac leaned back on his hooves and moaned as she gripped his thighs and went to work, slurping and sucking his cock as her spit covered his shaft and dripped down over his balls. Once his cock was slick enough, she popped him out of her mouth (much to his brief disappointment!) and climbed on top of him as he lay back. "Wha...what are you...doing?" he moaned.

"That big cock is going in my Human ass, stud!" whispered the pink-maned girl, as she reached between her legs and lined him up with her asshole, then sighed as she say down. "Ahhhh... feels just as good as before..." as she began bouncing her ass up and down on his lap, impaling his cock inside her tight, warm anus over and over. Her tits jiggled in front of his face as she leaned over. "...suck on them..." she said, as he grabbed one in his hooves and brought it to his mouth. Her eyes rolled up in her head at the double pleasure of being ass-fucked and titty-sucked...she wouldn't last long at this rate.

And neither would he!

With a mutual cry, each came in torrents, he gushing loads of cum into her willing, hot ass, and she squirting pussycum all over his lap. This went on for several moments, as each jerked and spasmed, lost in each others' bodies. Fluttershy fell onto his chest, still squeezing his cock with her ass muscles as she caught her breath, milking the last of his seed out of him. Then she sat up and looked down at him. "How... how was that?"

Mac heaved in a breath, then finally managed to blurt out, "That? Was amazing, Miss Fluttershy!"

She smiled. "I think you can just call me Fluttershy from now on, Mac. After all, you did just fuck me in my ass; we are waaaay past being formal with each other now!"

Mac smiled back. "Alright, Fluttershy." Then he suddenly gripped her by her hips and started thrusting into her ass again, which made her cry out in surprise and delight. "Ready fer Round Two®?!" he growled.

"Hey! What's going on?!" called out Dash, as she flew down to meet Twilight, Spike, Lyra, and Bon Bon. "Where you guys going?"

Twilight frowned. "Were you "napping" again, Rainbow?" the air-quotes in her voice abundantly clear to everypony but the pegasus. "We have a mini-crisis on our hooves at Alex's house; we're on our way to take care of it, hopefully."

"Cool!" replied Dash. "I'm always up for a good time! Let's go!"

Twilight sighed as they trotted along. "Rainbow, you don't even know...never mind...come on, we can probably use your help."

As they went, a strange scent caught her nose. "Wait...what's that smell?" asked Dash. She looked over at Lyra, then centered on her saddlebags. She flew closer as Lyra shied away. Dash sniffed again. "Is that...meat?!" She stayed in place as she hovered in the air above them. "Why do you guys have...meat?" Her eyes narrowed as she looked around at all of them. "And why are you taking it to Alex?" Then a huge grin slowly spread across her face. "You perverts! You were planning on having an orgy without ME?! I'm insulted!!"

"Rainbow!" cried Twilight. "It's not like that! This is for SCIENCE!"

Dash chuckled as she fluttered in midair. "Oh, sure! "Science!" making the air-quotes with her hooves. "Whatever you say, Twi!" She didn't stop laughing until they'd reached Alex's home.

Once they made it, Twilight gently but firmly said, "Excuse us, everypony!" and pushed her way through the herd to Alex's front door. After she knocked, Alex opened it a crack and peeked out. A look of relief passed his face as he swung the door open wide.

"You have no idea how happy I am to see you, Twilight!" exclaimed he, as he stood aside and let her troupe in. Alex gave a puzzled expression to Lyra and Bon Bon, waved to Spike, then fist-bumped Rainbow, who still had a smirk on her face. "What are you grinning about?"

She chuckled again. "Oh, you'll see!"

Twilight rounded on her. "Rainbow! Not! Helping!" then greeted Pinkie. She was just about to ask Alex where everypony else was when he held up a finger, indicating she should wait.

Dash settled herself down on a chair and looked around. "So! What's the big "emergency?" just as Applejack snuck out of the closet she'd ducked into, crept up behind Rainbow, then grabbed her around the shoulders!

"Gotcha!!" yelled AJ as Dash screamed and almost went through the ceiling! She flew behind Alex and with wide eyes, pointed a shaking hoof at Applejack.

"What! In the actual FUCK! Is THAT?!" But the blonde was laughing so hard she couldn't speak, so Twilight took over.

"That's the 'big emergency' we're here to solve," and here she looked at Lyra, "...but if our friend's Book is correct, it's a problem that will solve itself in a day or so."

Applejack wiped her eyes and sat down, growing suddenly serious. "Wait...you have...a cure?"

Lyra came forward. "We not only have a cure, we think we know HOW this happened." She turned awe-struck eyes up at the Human as she stepped closer. "You...you're a...' five-fingered' Human, correct?"

Alex looked down at his hands. "Mostly..." He held his hands up so she could see. "I used to have a sixth finger here, but it was removed soon after I was born."

"Oh wow..." she breathed, as her knees wobbled. "You are sooo...special...you have no idea what it means to me to be in your presence..."

"BUT," interjected Twilight, "...will his having had a sixth finger be an issue?"

Lyra's eyes darted briefly to the left, but she quickly said, "No! No, it won't be an issue at all!" Then she turned and looked at Applejack. "How...how does it feel to be...Human?"

Applejack took a moment, then said, "It was dang scary at first. Ah woke up feelin' normal, but then Ah looked down at mahself, and Ah lost it!" She smiled at the other Human. "Alex there helped me git through it, an' so did Fluttershy." Then her eyebrows raised. "Speakin' of which, where is Fluttershy? An' Big Mac, fer that matter? Ah ain't seen neither o' them fer the last hour..."

Alex looked at Pinkie, who grinned at Applejack. They all got the same idea at the same time, then turned towards the upstairs bedroom. Applejack got up and went to the foot of the stairs. "Big Mac! You git down here, Mister!"

An incredibly deep, masculine voice said, "I'll be right down..." Hearing that voice made every female in the room go wet, and their eyes widened as they heard heavy, two-legged steps descending the stairs.