Estrus among us

A few weeks had gone by, and Twilight decided to make her way over to Sweet Apple Acres. She was still pondering the response she'd received from Princess Celestia the day after Alex had arrived, and it had been an eye-opener at best:

My Faithful Student,

Know that this is not the first time these beings have appeared on our world. Many times in the past, they have shown up, sometimes with disastrous results, especially if they come in groups. Individually, they are usually benign and cause no trouble.

My advice is to get to know this "Alex" as well as you can for the time being. Once our scientists figure which Earth he originated from (for there are many!) we may be able to send him back. This will not be an easy process. As for his rather...sensual...ability, I also advise you to learn all you can about it. As long as it and he are controlled, there should be no harm done.

Sincerely Yours,

Princess Celestia

P.S. Don't be afraid to do some "experiments" of your own. (wink!)

So, armed with this knowledge, she'd finally sought out the Human. She didn't have to look far. It was the middle of the Fall Harvest, and all the Apples were out in the fields. She followed the sounds of trees being bucked until she found Applejack, Big Mac, Apple Bloom, and Alex all among the trees. She stopped to watch him.

Even though it was early Fall, it was warm enough that he had taken off his shirt, and his muscles rippled as he went from tree to tree. He didn't kick the trees like the ponies did, but grasped them in both hands and gave each a violent shake, causing almost all the apples to fall. It was not quite as efficient as bucking, but to her eyes, it looked like he still got the job done. Any apples left he simply climbed the tree like the ape he resembled and picked them. Then, he would stack two baskets on top of another two, pick up all four with little effort, and take them over to the wagon for hauling back to the barn. Not even Big Mac could do that, as far as she knew!

As she watched, she heard Applejack call out, "Alright, that's enough fer now! Let's take a break!" Then she noticed Twilight and came over. "Hey, Twilight! What brings you out here today?"

Twilight was having a hard time taking her eyes off the human, who had sat down under a tree next to Big Mac and Apple Bloom and had poured some water over his head after taking a sip. The water made his muscles glisten in the dappled sunlight, and Twilight found herself short of breath.

"Twilight? Equestria to Twilight, you there, gal?" Applejack waved a hoof in front of her face.

Twilight jumped slightly and said, "Oh! Applejack! What did you say?"

Applejack looked at where she was staring and smirked. "You're like the third mare this week that's come around to stare at the human."

"I wasn't staring!"

Applejack sighed. "Sure, you weren't. What else brings you around?"

Twilight drew herself up proudly. "If you must know, there are several questions I have for him, questions best answered back in my laboratory. Strictly for science, of course!"

Applejack briefly pondered. Then she said, "Wahl, Ah guess Ah can free him up fer a few hours. Celestia knows he's taken a huge whoppin' outta the work, and we need him." She raised her voice. "Hey, Alex!"

Alex sat up. "Yes, Miss Applejack?"

"Git yer lazy plot over here! Twilight wants to talk to ya!"

Alex gathered up his shirt, gave a hoofbump to Big Mac and Apple Bloom, then came over. Before he made it to them, Twilight urgently whispered, "Doesn't he have an effect on them?"

"Nah," Applejack whispered back. "We found that out the first day. Nuthin' weird happens when he touches either of 'em."

"Fascinating..." whispered Twilight as he strode up to the mares.

"How can I help, Princess?" asked Alex as he shrugged back into his shirt. The wind shifted and blew his musk right across both mares' noses, making the hairs on the backs of their necks stand up. Twilight cleared her throat with some difficulty.

"I...I have some questions for you, and I'd like to do some non-invasive experiments to find out more about you if you'd be willing."

"As long as no probes are involved, no problem," he smiled.

She smiled back at him. "No probes, I promise."

"Then let's go. Lead the way, Your Highness!"

Applejack called after them, "Have him back afore suppertime, Twilight!"

Twilight waved distractedly as she led the human away. They walked side by side, and she quietly observed him as they went. He was very tall, with a dark brown mane that only covered his head. She'd also noticed tufts of it on his chest and arms when he'd had his shirt off, and a naughty part of her wondered what it would be like to nuzzle it. Then she quickly clamped such indecent thoughts down. She is a scientist! There was no room in her schedule for lewdness, despite whatever her mentor might have been hinting at!

She was startled out of her internal monologue by the human asking her a question. "I'm sorry, what did you say?"

"I said, could you do me a favor?" He looked down at her as they walked.

"Certainly. What is it?"

"Could you...pick something up with your horn? I never get tired of seeing you unicorns do that!"

She smiled. "Technically, I'm an alicorn, but no problem." She looked around for a rock or a branch, then she got a wicked idea. "Stop," she told him. He did and waited. She concentrated, then fired up her horn, enveloping him in her magic. Just as she was about to lift him, it fizzled out! Startled, she tried again, pouring more magic into the effort. Again, the same as before. Panting, she stopped. "That's...strange. My magic doesn't appear to work on you. Something about you is canceling it out..."

He looked down at himself. "Is that unusual?"

Twilight's brow was deeply furrowed. Almost to herself, she said, "Yes...very..." Then her face brightened with an idea and she said, "Follow me." She turned and marched off, leaving Alex to catch up with her. They soon found themselves at Carousel Boutique. Twilight opened the door and was greeted by Rarity.

"Welcome to Carousel Boutique, where everything is chic, magnifique, and...oh, Twilight! What a pleasant surprise! What brings you..." Rarity's voice trailed off as the human followed her inside. "Twilight. What's he doing here?"

"I need to talk to you in private about him, Rarity. It's important."

"Certainly." She cast a wary eye at Alex. "Don't touch anything while we're gone, human!" There were several other customers, mostly mares, in the Boutique as well, and Rarity addressed them before she went with Twilight to the back room, "Please, continue shopping! If you see anything you like, don't hesitate to let me know, and don't worry about the alien. He's harmless!"

Alex found a corner and stood in it, trying to look inconspicuous. Despite Rarity's reassurances, however, two of the mares dropped their purchases and made an immediate beeline for the door, never looking back. The remaining customers whispered to each other, casting doubtful glances his way. After a time, one mare, with her friend behind her, approached him. Alex looked down. All the female ponies' heads only came to about waist-high on him (perfect blowjob height, a tiny, dirty voice inside him said), while the males were slightly higher. "Umm...can I help you?" he asked her.

"I just wanted to see you up close," she said. "I've never seen an alien before." She swallowed before adding, "My friends think you...eat...ponies. Is that true?"

He tried what he hoped was a reassuring smile. "No, it's not true. I would never hurt any of you. You're too cute."

The mare turned bright red and absently twirled a strand of her mane around one hoof. "You think we're...cute?"

Alex nodded and repeated himself, "And I would never hurt any of you."

She awkwardly disentangled her hoof from her mane and turned to her friend. "See, I told you, May!" Her friend looked unconvinced.

"That's just what a predator would say! C'mon, Cherri! We have to get away from him!"

Cherri made to follow her friend, but before she did, she leaned in close to Alex and took a huge whiff of his male sweat. "You smell nice..."

"Come on, Cherri!!" May yelled.

Cherri jumped and followed her friend, but not without a backward glance at the human as she left.

Meanwhile, Rarity had noticed her customers leaving and was beginning to get a bit anxious. "Can we hurry this up, Twilight? I hate to be rude, but it seems the human is having a negative effect on my shop."

Twilight frowned. "I'm sorry, Rarity, but this really is important. I need you to try and use your magic on him."

Rarity's eyebrow's shot up. "Whatever for?!"

"Because when I tried to earlier, my magic had no effect on him. I need to find out if it's just me, or if it's all Equestrian magic."

Rarity looked skeptical. "Your magic greatly outmatches mine, Twilight. If yours had no effect on him, I highly doubt mine will."

"All the same, if you don't mind."

Rarity sighed. "Very well. Shall I try it now?"

Twilight shook her head. "No, meet me in my lab as soon as you're able. I'd like to do this under controlled conditions, where I can record the data."

Rarity turned and cast a baleful eye at the human, who was still in the corner, looking at her nearest dresses. At least he's keeping his hands to himself, she thought to herself. "Alright. Give me about an hour to close up, and I'll be there."

Twilight smiled. "Thank you! I'll see you soon. Alex! We're going!" She left the shop followed by the human and a huge sigh of relief from all the ponies still left in the boutique. As they walked, for his part, Alex was in a state of constant semi-arousal. All the naked female butts around him...it was like being at a beach in Europe. Everywhere he looked, he saw one perfect ass after another, so he soon learned to keep his gaze downward, if he didn't want to be sporting huge wood by the time they reached their destination.

As they made their way back to the Library with few incidents ( which mostly involved some mares cringing and running away in panic, others staring boldly at the human ) they were stopped by Rainbow Dash flying down to meet them. "Hey, guys! What's up?"

"Hello, Rainbow. We're on our way to my lab for some experiments," said Twilight. Rainbow startled when she heard this, and a wicked grin grew on her face when she looked at Alex.

"Sounds great! I'll join you two as soon as I can!" Before Twilight could stop her, she flew off. She flew straight to the local mechanic's shop and touched down. Barging in, she yelled, "Ratchet! I need you to make me a device, pronto!" The pegasus mechanic lifted the welder's helmet she was wearing and gave the excited Dash a skeptical look.

"What'd you have in mind?"

Quickly, Dash told her what she wanted. Ratchet shrugged. "That shouldn't be too hard. When do you need it?"

"Right now, if you can do it!"

Ratchet looked around her shop. "Give me a minute..." After rummaging for a few minutes, she found all the parts she needed. "Be about an hour," she said and got to work.

At the Library, Twilight called for Spike as soon as she and Alex arrived. "Spike! Spike! I need you!" The little dragon came running.

"Yes, Twilight? What is it?" He'd been doing the dishes, and still had on his apron and gloves.

"Alex and I will be down in the Lab for a few hours. Rainbow Dash and Rarity should be joining us shortly, as well. Don't come down, no matter what you hear, understand?"

Spike's eyebrows shot up. "But what if you need me?"

Twilight went up to him and nuzzled him gently. "You're my number one assistant. But the nature of my experiments will be very private, and I can't afford any distractions."

Spike smiled and gave a snappy salute. "You can count on me, Twilight!" He took off his apron and gloves, and set himself to watch by the front door. He gave a wave to the human as he passed him, who returned it. Alex had been watching this exchange with growing interest; it seems the pony and the dragon had a personal relationship, one he found himself envying.

The closest one he had to a friend so far was Big Mac, but even that was more of a business relationship. As he followed the purple pony down the stairs to the basement lab, he wondered if he'd ever been seen as more than an oddity.

When he reached the last step, he stopped and gasped. The laboratory was much bigger than he thought it would be, with gadgets and instruments he hadn't thought the ponies' technology was suited for. Twilight put on a lab coat, magicked up a pad and a pencil, and turned to him. "Please, have a seat on the table." She gestured to an oblong lab table set up near the back. Not without some wariness, he approached it and sat down. When Twilight tried to levitate electronic leads to attach him to several machines, her magic had the same effect as before, so she ended up having to attach them manually. This brought her in extremely close contact with the human, something she was not quite prepared for. By the time she'd gotten all the leads attached to him (his arms, his chest, and his head) she was feeling quite flustered and had to sit down for a moment. Alex noticed her condition.

"Are you alright?"

She nodded her head. "Yes, yes...just give me a moment," she said as she sat next to him with her gaze to the floor. In an effort to comfort her, and without thinking of the consequences, Alex reached out and stroked her mane, lightly touching her horn in the process. The contact to herself was immediate. A shock went through her body and she moaned. Alex drew his hand back as if burned.

"Sorry, I forgot!"

Twilight sat panting with her eyes closed, then whispered, "Do it again..."

"W...What?"

She opened her eyes and looked up at him. "Touch me again." Slowly, hesitantly, he reached for her horn. He stopped for a moment, swallowed, then grasped it, her eyes boring into his the entire time. "Sweet CELESTIA!" she screamed as the orgasm hit her more powerfully than before! She convulsed and spasmed while holding onto his arm, and when she could take no more she screamed, "Enough!" and he let her go.

The sight of the round-bottomed pony cumming to such a degree was not without its effect on the human. Alex was ramrod stiff but said nothing about it as he knelt on one knee next to the prone Twilight. As he gazed down on her with concern, she whispered, "Help me out of this coat."

He wasn't sure he'd heard her right, so he said, "What did you say?"

Instead of answering, she began to take off her lab coat. He saw what she was doing and reached to help. He was still on his knees helping her when she suddenly leaned forward and buried her face in his crotch, taking a deep sniff. "So male..." she whispered. If he wasn't stiff before, he certainly was now! She got to her hooves and stared at him like a predatory animal. "Take off your pants..."

"E...excuse me...?"

She walked past him to the steps of the laboratory, fired up her horn, and he heard a >click< as the door was locked. She turned back to him, growling. Alex had gotten to his feet, but that's all he had done. He was too much in shock to see the normally prim and proper Princess turned into...he didn't know what.

But she was done with waiting.

As he watched her, she walked slowly up to him and again buried her face in his crotch, nuzzling and licking him through the fabric. She traced the line of his cock with her tongue up and down, and back again, still growling. That did it!

He reached down and undid his fly, then grasped his waistband and slid down his pants, underwear and all, to his knees. His ten inches popped up and were throbbing before her, and she gasped when she saw it. Having had little direct experience with males (but having read extensively) she wasn't sure how to proceed, but she gave it her all. She slowly opened her mouth and stuck out her tongue, beginning at his balls, and gave them a lick. Instantly, her mouth was flooded with his pheromones, which only made her crave for more! Alex sighed and closed his eyes. He hadn't had this kind of female attention in months, ever since his last girlfriend, and even she hadn't been this eager. The pony's tongue covered every inch of his cock, getting it sopping wet and making it throb even harder. A drop of precum appeared at the head, and Twilight eagerly lapped it up. She then stood on her hind legs and braced her forehooves against his hips, then opened her mouth wide and engulfed him slowly to the base, sucking hard as she bobbed her head up...and down...up...and down.

Then she began to pick up the pace, going faster. He buried his hands in her silky mane and guided her as his moans mingled with hers. She continued to bob and suck, her eyes trained on his to watch his reaction. She smiled around his cock when she saw the pleasure on his face, pleasure she was giving him! The books were right! His hips started to buck and his balls drew up, signalling his end. "Twilight! I'm...cummming...!" The machines to which he was connected started to go haywire, buzzing and sparking, but Twilight was past caring. With one more thrust and a great cry, he pitched forward and shot his first load down her throat. She wrapped her hooves around his waist and held on for dear life. He bucked wildly with each burst, sending load after creamy load into her mouth and down her throat as she frantically swallowed each and every drop.

He sighed and leaned backwards onto the table, supporting himself on his hands, while Twilight continued to suck and lovingly lick him, making sure she got every last bit of cum. At last, she let him fall out of her mouth and said, "That...was...wonderful!" She looked over at her machines, and smiled. "It's going to take me months to process all the data." She got down on her hooves as he pulled up his pants. She smiled up at him. "I think I'm going to need you as a 'test subject' again soon..."

He smiled back at her. "Count on it!"

As Rainbow and Rarity finally made their way to the Library, a yellow pegasus, perched high on a cloud overhead, had watched Alex when he'd gone into the Library, and had watched him when he was at Sweet Apple Acres.

She watched, and bided her time...