I didn't believe it at the time... I'm still not sure I believe it – maybe I just have an overactive imagination. I'm certain nopony else would believe me if I told them, and even if they did, they'd probably end up locking me in the dungeon. I'm sure she wouldn't mind that. She's been begging me to get some restraints involved lately ... not my thing, though.

It all started near the end of one fateful shift of Royal Guard duty. I was at my usual post in the Princess's personal chambers. Just me at the time, because it was in the middle of the day, because the young filly Celestia was expected to be at her studies in the Royal Library well beyond the end of my shift, and because my usual squad-mate had come down with a case of the feather flu, along with too many others. With the pegasus guards decimated by this bout of feather flu, us unicorn guards were stretched thin.

That didn't matter, though. I was merely guarding an empty bedroom, hardly the most heroic – or even necessary – duty, but the Captain had placed a high emphasis on protecting the vulnerable young alicorn sisters, so there I was, guarding the empty room just in case somepony tried to sneak an assassin or booby trap inside while the Princess was away.

It was a dull duty, but necessary, as was most Guard work. But it was also easy duty, and it left me able to simply stare at nothing and space out, letting time slip by me as I garnered more pay and respect than most other ponies could ever expect. Not a bad career.

Unprecedentedly, though, Princess Celestia suddenly came in through the chamber's front entrance, with no fanfare, no prior notification from my superiors, not even with the two guards who should have been with her at all times. She casually kicked the door shut behind her.

“Princess!” I called out. “What's happening? Where are your bodyguards? Has there been an incident?”

“No, no, I'm fine.” She trotted bouncily over to her bed and flopped herself on top of it.

“But, what happened to your—”

“My bodyguards are fine. They still think I'm in the library's private study room.” She still carried a bit of a childish lisp, pronouncing it almost like 'wibrary'.

“How could...?”

“They don't know that I figured out how to teleport a couple decades ago.”

Great, so she teleported away from her guards, leaving them guarding an empty room. “Princess, you're not supposed to be unguarded at any time!”

“I have you, don't I?”

Well, yes, but... “I... I have to report this to my supervisor.”

“And leave me totally alone and unguarded?” She propped herself up and looked at me with big and entirely facetious puppy-dog eyes.

Despite her blatant insincerity, she had a point. My duty at this time was clear: I couldn't leave the young Princess completely defenseless, so I would have to stay with her until I could contact other guards. That could be expedited, though. “Princess, I must request that you come with me to the castle barracks so I can arrange for you to have the proper escort of two or more guards.”

“Hm... No.” She hopped down off the bed and walked toward me, a smug grin on her face.

“Princess! I must—”

“You must do what I tell you, because I'm a Princess and you're not. And right now, I'm telling you to watch over me while I do my stretching exercises.”

“But Princess!”

“And do it quietly.”

I gulped. “Yes, Princess.”

“Much better.” She smiled cutely, winked at me, and then proudly and deliberately paced over to a spot directly in front of me. “Now keep a close watch.” Laying herself down on the soft carpet, she took one back hoof and began pulling on it with her front hooves, stretching it nearly to her withers. “They say I have to do this to keep limber through my expected growth spurt over the next ninety years.”

As strange as the situation was, I resigned myself to it and made mental notes for my report later. So long as I did exactly as I was supposed to do, nothing bad would be coming my way for any of this.

When the little Princess turned and began stretching the other hind leg, though, I became aware of another problem that could end up getting me in trouble, big trouble: with the direction she was facing and the way she was stretching her leg, the way her tail sprawled out on the floor behind her... Well, her little pink private parts were suddenly on full display right in front of me.

Don't get me wrong, I'm not that kind of stallion. I don't look at little fillies that way; full-grown mares only, please. But if anypony came in and saw this, it would at the very least raise eyebrows and cast suspicion. But I couldn't look away – I had a royal order to watch closely! It was unbearable!

She rolled onto her back, now stretching both back legs upward, pointing her tiny butt right at me. The little pearl-pink lips of her pussy opened slightly as she spread her legs, showing off a little slit of richer, wetter pink inside. Why was she wet!? She looked at me through the gap between her legs. “Are you enjoying the view?”

I immediately blinked and resolutely stared just above her, watching her only in the most general sense. My legs ached from how stiffly I was holding them still, and a few little drops of sweat broke out on my brow. But she had ordered me to be quiet, so I refrained from answering.

Rolling over again, she rose to all fours facing away from me, and then leaned far forward, stretching her back legs almost straight out behind her. But why couldn't she at least cover herself with her tail? Why was she holding it up and to the side? I mean, I'm totally not into fillies that young, but what stallion could be watching that and not at least glance at the way her prepubescent vulva bulged outward a little as it was squeezed between her tight cheeks of her perfect little ass?

Despite that, I was doing a good job – well, maybe an acceptable job – of maintaining my self-control and composure. It had been drilled into me by countless sessions of Guard training, after all.

But when she reversed the stance, straightening her front legs out ahead of her and sticking her rump up into the air right in front of me... That's when I lost it. I could feel my cock begin to bulge and drop free from my sheath, despite my best efforts. I could only hope that her stretching routine wouldn’t involve looking in my direction for a while, maybe enough time for me to regain control of myself and...

I stared, stupefied out of all self-control, as the filly Princess's tail rose higher, putting the delicate pinkish skin underneath on full display. Her little pussy winked at me, showing me a flash of deep-pink clit and dribbling out a glittering string of filly juices.

What? My cock surged uncontrollably harder. She shouldn't be in heat yet! She was just a little filly! How could...

She winked again, and then again even wider. I caught a clear glimpse of her fleshy tunnel inside, saw the next splatter of her wetness flow out from deep inside.

I couldn’t help myself – at the sight of that, my cock surged upward again, slapping against my belly this time. It was okay, I assured myself, as long as she didn't...

She did hear it. The moment it happened, she spun around, pointed right at the bobbing head of my cock, and shrieked.

Shit! I was in for it now. I'd be thrown in the dungeon for sure, charged with molesting royal fillies. And there was nothing I could do about it. “Princess, I... I can explain!”

“Oh you naughty boy, you!” the little filly Princess giggled.

“I, um... This isn't—”

“How dare you stand there, staring at your innocent young princess's filly bits and jerking off?”

“I wasn't—! Huh?” This was starting to get even weirder. The way she was talking didn't sound like an innocent young filly, despite the slight lisp in her voice.

She walked up and stared me closely in the eyes, which was very intimidating, despite how I was looking down at her. “Just imagine what kinds of punishments you'll have in store now! How could you possibly ever make it up to me?”

I looked down at her, quirking an eyebrow. It didn't seem right. That wasn't the reaction of a little filly who'd just been confronted with her first sight of an erect stallion. It was more like some kind of...

“I'll tell you how you're going to make it up to me: you're going to fuck me until I scream.”

I sputtered a cough. “I apologize for my indecency, Princess, and you know I would do anything you ask, but—”

“So do what I ask: Fuck me.”

“I... I can't! It would be illegal!”

She rolled her eyes. “Illegal according to whose law? Mine?” She closed the distance a little further, then reached out and traced a hoof down the muscles of my chest. The taboo touch was electrifying and terrifying at once. “Don't let my looks and my voice fool you – I'm one hundred and twenty-one years old, but thanks to the way I look, I haven't had a good fuck in months!”

I gulped. Was this actually illegal? Or morally wrong? I wasn't so sure anymore. I was sure that it wasn't socially acceptable, though, and I—

Celestia spun around and pressed her rump against me, squeezing it between my front hooves and inching herself in underneath me. I felt something warm, soft, and wet touch the tip of my cock. “Fuck me silly,” she said, “your Princess demands it!”

Oh Goddess! My cock was touching this little filly's pussy! I could feel its tiny winking motions against my broad tip. Well, fuck. I was in this now; it was happening. There would be no going back, no denying things now. The little Princess I had sworn to protect was dribbling her filly nectar onto my cock.

My legs trembled from the shock, from the unbearable awkwardness of our situation. I could barely breathe.

“Do it!” she demanded.

Like a cliff diver handing his fate over to the waves, I pressed forward onto her, into her. Or, I would have, but my nerves were getting the better of me. My cock smushed up against her wet fillyhood, but she was very small and tight, and my erection was sagging. I tried again and again, but I was getting soft, jelly-like, and my shaft kept bending, my tip slipping away under her belly.

“Come on, give it to me!”

I tried, I honestly did, but my body just wasn't cooperating. A couple times I got close, began feeling her wet warmth spread over my tip as it found its way inside a little, but even then it slipped free rather than penetrating inside her incredibly tight little pussy.

“Ugh, what's wrong with you?” She darted out from under me and stood in front of me, poking a hoof into my chest. “Are you gay? Why are so many of my guards gay?”

“No, no, I... It's just that I'm, well, I don't want to hurt you, Princess.”

She looked down at my cock, at how it was still out, but now drooping toward the floor. “That's no good! Come on.” With surprising strength, she pushed on my chest and knocked me over to a sitting position on the floor, my back legs sprawled out in front of me. In an instant, her mouth was on my tip, her delicate little tongue swirling around expertly, licking her own juices off of me. Her hooves stroked gently up and down my half-hard shaft, barely able to hold the girth of it.

My cock bobbed upward a little. “Oh Goddess, how are you so good at that?”

“That's more like it,” she said, looking up at me while her hooves kept working. She went back down, this time flicking her tongue up and down my entire length, sliding her cheeks across the roundness of my shaft as she pressed it against her face with her hooves. She licked me desperately, as if she'd been starving for cock.

I leaned my head back and groaned as she went lower and lower, as she began kissing my sheath, and as she went lower still. When I felt her wet little tongue slide up the smooth crevice between my balls, I looked back down at her. She looked so tiny down there, nuzzling her nose into my sack – it was at least half the size of her head, it seemed, and she loved burying her face in them, hugging their fullness against her with one of her hooves.

Her other front hoof had disappeared below her belly, and from the way her tail was flagging upward, I could guess what she was doing with it. What I couldn't anticipate, though, was what she did once she worked her way back up my shaft with a series of sloppy kisses. She stretched her lips around the head of it, squeezing it inside, and then she proceeded to give me a deeper deep-throating than I'd ever gotten from any grown mare.

Celestia pushed herself down on me with abandon, sliding me into her throat before I even realized what was going on. But hitting the back of her throat was just the start. She brought herself back up a little, then slammed down again, pushing even deeper. Again and again, she went deeper and deeper.

I could only stare, my mouth gaping wide in amazement and subconscious emulation, as she did what should have been impossible.

Her neck bulged visibly outward every time she went up and down, but she didn't gag or cough at all. In fact, her hoof was still madly stroking between her back legs ... she was enjoying it!

How did she even fit it in her mouth, much less do all of that? It left me dumbfounded, but my body knew how to respond to the soft gliding wetness of her mouth and throat. My cock swelled again to full hardness, making her stand as tall as she could just to keep the angle right.

Finally, as my balls began to feel soaked from her drool, she pulled back up and admired my hard-on now that it was throbbing and begging for attention. “That's better!” she said with a gleeful smile. Then she turned around and raised her tail, dropping her chest to the ground in an exaggeration of her stretching pose from earlier. “Are you ready now?” Her pussy winked madly at me, dribbling her clear juices down her leg. The whole area was smeared with glistening wetness, thanks to her playing with her hoof.

I stared for a long moment, entranced by the sight of a pussy so young showing such signs of arousal. The little rounded bulge of soft flesh nestled deep between her ass cheeks winked open and closed over and over, begging for attention as it flushed a little redder shade of light pink. It was so small! How was I ever going to fit inside her?

“Come on!”

Snapped out of it by her goading, I went forward a little. My cock swung back and forth under my belly with each step until my front legs straddled around the little filly. This wasn't like mounting a mare ... I stood over her, my chest not even making contact with her back and my front hooves not leaving the ground. But the feeling as the tip of my cock touched the intense heat under her tail ... that was familiar.

I pushed against her, and this time I didn't slip away or miss the spot. But still, I didn't get the delicious feeling of slipping into a welcoming mare. The broad head of my cock pressed in place perfectly in the middle of her pussy lips. I could feel them pulsing against me, kissing the tip and beckoning me toward the needy heat inside. But she was just too small, and I was just too big, my tip wide enough to cover her entire little fillyhood.

But that was when the Princess really took control. She forced herself back against me, wiggling her rump a little side to side, letting her little filly lips slide over just a little more of my tip in each wiggle.

Without even thinking about it, I found myself thrusting my hips to her rhythm, poking my eager cock against her each time she moved.

Until, finally, it happened. With a surprising sudden lurch, my cock sank a little way into her glorious little pussy. It was like dipping it into warm bathwater ... if warm water pressed tightly on all sides and pulsed hungrily. We both stopped for a moment, savoring the incredible feeling of that first little penetration. Only a tiny bit of my length was inside her, and yet it felt incredible. The only motion between us was the winking of her pussy and the slight twitching throb of my cock inside it, both of us letting our most sensitive bits of skin become intimately acquainted with each other.

Slowly, I began letting my hips press forward, inching my way into the delicate little filly. Her pussy lips stretched tight around my girth, and I could feel her back legs trembling with the strain of keeping herself upright despite the pressure. So I slowed down and focused on going in and out, spreading her slick filly juices across what little of my cock was inside her.

“Ugh! Come on, fuck me already!”

I looked down at her, craning my head to peer between my front legs. “P-Princess? I'm trying, but I don't want to hurt you.”

Celestia covered her face with a front hoof. “You Guards are all the same, always worrying about me getting hurt. Just forget about it and fuck me already!” She didn't wait for me to follow through with her order, instead she pushed herself backward across the carpet, sliding her slick pussy over my cock as I held stock-still in disbelief.

She made it seem so easy, slipping up my thick shaft like it was nothing. Every time she paused for a moment, I was sure that I'd bottomed out in her, finally found her limits, but each time she paused, it was only to rock back and forth then thrust back again, impossibly swallowing even more of my length into her hot inner flesh. Her body slipped through the gap between my forelegs, going farther and farther underneath me.

Finally, she stopped, but only when the moist kiss of her thin-stretched young pussy lips met the rim of my sheath.

Oh my Goddess, how was that even possible? Craning my neck down and to the side to see under my belly, I looked at her. The curve of her back matched the curve of my stiff cock perfectly as she shuddered in place, finally filled as completely as she could be. I could just imagine the broad girth of the base of my cock inside its sheath, squeezed between her little ass cheeks, the veiny lower part of it being massaged by her stretched pussy lips every time her winking forced her clit to slide up and down against the bottom of it, the long curve of its smooth length beyond that must have been getting squeezed deep, deep inside her, well beyond her little rump and up into her belly. I wasn't sure, but when I looked closely, I thought she looked a little thicker in the middle, a little wider where my cock was pushing on her from inside.

“Ah... that's better.” She rocked side to side slightly, testing out the feel of my hard shaft inside her. “Now, are you finally ready to fuck me like you mean it?”

I could barely find my breath to answer. “Y-yeah... I mean, um... Yes, Princess.”

“Then do it already! Don't worry about me – I can take it.”

With a deep breath to steel my nerves, I decided to give her exactly what she asked for. I pulled out of her some, feeling the cold air against the wet base of my cock, then slammed back into her as hard as I could, making my thighs slap against the firm flesh of her ass.

“Yes!” the Princess shouted. “More!”

Taking that encouragement to heart, I truly began fucking her in earnest, holding her shoulders between my forelegs as I thrusted into her, doing her harder than I'd ever done any mare in my life.

And she ate it up, moaning every time my balls bounced against her ass, her legs quivering around me ... she probably wouldn't even be able to stay standing if it wasn't for the strength of my cock holding her up from the inside. She bounced back toward me a little every time I pushed into her, adding a little more force of her own, as if even my hardest pounding wasn't enough for her.

My back hunched over the little filly as I gave her everything I had, holding her tight, squeezing her between my hooves as I pounded into her. It almost felt a little like I was using her as a toy to masturbate with, rubbing her steamy insides desperately against my cock. She was so tight! Even as fast as we were going, I could feel her constant inner grip squeezing me for more, more, more!

“Aah! Oh yes! Oh yes!” Celestia squealed as I increased my pace a little more. Her back legs lifted off the ground every time I bottomed out inside her, and still she begged for more, even as both of us began dripping sweat into the carpet.

It was getting to be too much... Her incredible tightness and warmth, her moans and cries, and the incredibly taboo idea of using a little filly as my own personal cock-toy. My tip began to flare out as a familiar tingling pressure built around my balls and the base of my shaft. It stretched her obscenely from the inside ... I couldn't imagine how huge it must have been deep in her pussy. How could she have room for that massive flaring head inside her?

Celestia's moans blurred together and became an almost constant high-pitched squeal as the broad edges of my flare rubbed back and forth deep inside her. With a surprising sudden jolt, all her legs stiffened, her wings popped open under my belly, and her pussy clamped down hard.

I couldn't even move as the little Princess's orgasm made her pussy clench tight against me over and over ... but I didn't need to move. Her inner flesh rippled and pulsed over my straining cock, instinctively massaging and milking me, trying to coax me into my own climax. Warm wetness splashed over my balls and drained down my thighs as she trembled in place, locked in the throes of an intense wave of pleasure.

Just as Celestia's desperate pulsing began to slow, I reached the brink of my own endurance. I groaned loudly up to the ceiling as the dam inside me broke, letting loose a thick stream of cum. I could feel it leaving my heavy balls, I could feel the mass of it bulging down through the length of my cock, and I could feel the unmatched pleasure of it gushing from my tip, directly into her. It gushed straight into her little immature womb, and even the first spurt was more than enough to stretch her tiny insides to the limit. As another hot spurt worked its way into her, I could already feel the first flowing out of her, between the tightly stretched skin of her pussy and the hardness of my shaft. More and more came, and her tight-stretched pussy lips began spraying thin streams of white around my girth, pulsing in time with every full pump of cum.

Both of us stood transfixed for an endless moment as our bodies both gave each other the ultimate rewards. Who cares that fucking a filly was so wrong? It felt so right, so good ... such ultimate bliss couldn't possibly come from anything less than perfection.

Finally, though, both of us began to breathe again, deep heaves as our bodies both twitched and squirted the last little bit of our shared climax. I tried to pull away from her, but only ended up dragging her a little across the carpet. We had to wait for her inner tightness to relax, for my spent cock to soften. Only then could I pull out of her, my glistening-wet cock slipping free and letting loose a heavy gush of white as the head of it popped out and swung downward.

Before it shriveled and sank back into my sheath entirely, Princess Celestia spun around, grabbed the thick, flopping shaft, and pulled it into her mouth again.

I moaned as the little filly took me into her throat again, more easily this time since my cock was softer and wetter. She worked at it earnestly, despite my inability to show any more arousal, her throat clenching and pulsing as she swallowed the last of my dribbling cum, as her lips pulled in the sheen of her juices from the warm skin of it.

It was almost enough to get me going again, but just as my cock began to grow and stiffen a little, she pulled away and stepped out from underneath me.

Without a word, she trotted off toward the suite's bathroom. She still held her tail high, showing off her obscenely wet and sticky treasure where there should by all rights only be a perfect and clean virginal pussy. Her inner thighs were drenched with dripped juices and cum, and even most of the curves of her ass had been splashed with things that should have never touched a body so young-looking.

Still, I had a duty to uphold. So I followed her into the bathroom, even as my wet cock sank back into my sheath. How those stains left on the carpet would be explained, I had no idea.

Celestia quickly and efficiently started a shower for herself with her magic, and I have to admit I took more pleasure than I perhaps should have from watching her douse herself in the hot stream, watching the way the water droplets cascaded over the tight curves of her ass, watching how she enthusiastically scrubbed under her tail with a sponge, leaving foamy white soap bubbles all over her tiny privates.

She was rinsed and done in no time, stepping out of the shower dripping wet, her mane and tail clinging close to her body. It wasn't fair! How could she find yet another way to make her little filly body look so sexy?

When she made her way to the bathroom window, her horn glowed brightly. A moment later, astonishingly bright sunlight blasted the room, forcing me to cover my eyes.

When it faded and I could blink away the glare, Celestia was perfectly dry, though wisps of steam still rose from her mane. “Ah, a sun bath is so refreshing...” She looked over at me. “Now, may I recommend that you take advantage of the washroom? I'm going back to the library.” Her horn glowed as if she was about to teleport, but she suddenly stopped, canceling the spell. “Oh, and I wouldn't recommend reporting this to your supervisor. I'm pretty sure there's no way you could phrase it that wouldn't end up getting you thrown in the dungeons. And besides, I'll want to see you again sometime. Of all the guards I've fucked, you're one of the better ones, once you get over trying to be protective. Hm... eight out of ten, I'd say, and who knows ... you might improve with practice!” Her horn glowed again, and this time she vanished in a blink of yellow magic, leaving me alone in the royal bathroom.

I took a deep breath and then turned the shower back on. She was right after all, I would need to get cleaned up. But the thought that it might happen again... Woah, that was too much to handle at the moment.

Of course, that was all more than ten years ago. The Princess has grown a little bigger since then, and so has her secret harem. I'm grateful to be a part of it, and proud that I'm still one of her favorites. I don't think I'll ever get tired of that feeling I get when I find out a royal override has assigned me to a solo shift in a private place, of knowing just what that means is in store for me.