You really did turn out to be a better horse than a man. My instincts are never off, and I see thousands of potentials a year. There’s something about those who eventually join us that just stands out to me. The way their eyes linger on our prize stallions. The way they stand off to the side of the tour groups. Admiring our well-tended examples of horse flesh for a bit longer than everyone else. No kids, no family, just coming to see them by themselves. Why else would you be here if you didn’t want to be a horse? 

I knew the moment I saw you that you wanted to join our herd. Some men want to be mares, of course, and it’s hard to know without asking, at least, at first. But I have an eye for such things. Deep down, you wanted to be a breeding stud, whether you knew it or not. So I was able to prepare your drink in advance. You were sweating, thirsty, and the day was hot, after all. You couldn’t turn down a cold drink. It was intended to start the process, sinking into your blood to prepare you for the superficial changes. You didn’t know that, of course. But if I told you when I handed it to you, would you have refused? When I see you on the stands or with a mare, I’m sure of the answer. It doesn’t matter now, anyway. You did take the drink, and there’s no going back for you now. Not that you ever would! 

I’m sure you felt strange over those first few days. But I bet there was something almost natural about it, too. The way your skin tingled and itched. The extra energy. Hungrier than you’ve ever been. And, of course, the arousal. That’s the whole point, isn’t it? You wanted to be hung. There might have been other things to draw you to equine life. The peaceful life. The butt. The muscle. But deep down, it’s always the cock that takes priority. Whether you want to feel it dangling from your loins or embedded in your virgin mare cunt, it makes no difference to me. And that’s why it’s always among the first things we change. 

I would have loved to see your face that first time. Lust boiling in your blood. Your erection raging more intently than at any point in your life. I bet you needed to touch it, no matter how dark the skin grew. Surely, you came quickly that first time, spraying cum all over your groin and chest. But it wasn’t the last time that night, was it? Of course not. You had some real stamina already, didn’t you, boy? I bet it took three or four sessions to fully drain those balls. Even as they swelled with fresh semen. Even as your cock got longer each time, or the skin blackened with thick veins, fueling expanding erectile tissue. You just couldn’t help yourself, could you?

I bet it didn’t take long at all for it to noticeably change. Not with the way you were likely touching yourself! Thick as a beer can when it swelled, black mottled skin all over. Several inches long, long enough you couldn’t remember how it was to begin with. How thick your foreskin had become, pulled down whenever you grew erect, having turned silky black, too. How your cock head seemed to sink into it after each session. Only to rise once more as you marveled at it. You probably wanted to hide it away in shame after you were done, right? Or at least that’s what you told yourself. You couldn’t keep your mind off it, could you? The way I figure, you’d be sitting at your work desk and barely able to keep it under control until after your shift!

You had to know something was wrong. You’re not stupid. But that wasn’t enough to make you stop, was it? You were masturbating yourself into growing an animal’s cock, and all you could think of was the next time you got off! At that rate, it wasn’t going to stay human for long. Have you ever seen a horse’s cock before? Of course, you had. More than 18 inches, mottled pink and black. A flared, mushroom-shaped tip with a lumpy crown. Thicker at the head as the shaft tapered into a medial ring. Your fuzzy foreskin so big it could hide all that horse girth away. Thick, throbbing testicles so full of seed that you could barely get them in your underwear. And yet, you didn’t care. You loved it, really. Never wanted to go back. Even if you didn’t want to admit that to yourself just yet. 

Surely, you took all the time you could to admire your length before it swelled so large with blood you couldn’t think. Something that big needs more blood than the human body can allocate, after all. And all the better for you. No need for pesky thoughts to keep you from your pleasure! Control probably never returned until you were done making a mess each night. So pleasant and warm, I bet, spraying a stallion’s load onto your chest. You’d be embarrassed, I’d wager, having to clean up such a mess after every session. Not that it stopped you from going back to it the moment your balls recharged, you horny beast! 

And it didn’t end there, of course, not that you cared. Even as it strained your voice to talk normally. That high-pitched nasal quality you tried to play off as a cold. The added bulk under your clothes. Your hair getting longer and shaggy down your neck. A thickening treasure trail. Cravings for oats and sugar. Hell, I bet you stank! Not to someone like me, of course. But in an office where people weren’t used to horse sweat? You never could get the smell off your skin, no matter how much you showered!

You had to know you were making it worse for yourself. Hell, I bet you didn’t even care, deep down. But surely it was getting inconvenient for you. Clothes that didn’t fit, no matter how many sizes up you bought. Or a lump above your ass that sometimes twitched at night. And the way your fingers seemed so stiff and unresponsive? It wouldn’t take long for it to become hard for you to masturbate. Losing your ability to type, to grip, to hold was surely daunting. But we both know that all you would really miss was the ability to masturbate such a magnificent horse cock!

The idea to come to us for help was surely always in the back of your mind. Maybe there was a worry you’d have to forsake your humanity to try. But let’s be honest. You were doing that anyway. So you took the time off work, drove here. It couldn’t have been easy with your fingers so stiff. But it was worth it for you in the end, wasn’t it? You don’t need fingers now! Or your car, but we put that to good use. Oh, you didn’t know you signed over all your assets as part of the deal we had you make? Not that you care now, you lucky stud! 

Still, you were given the offer to get out help to change back if you wanted it. We aren’t monsters, after all. Giving people what they’ve always wanted, whether they knew it or not, is our mission here. So we told you how it worked. Maybe we lied a little, at least by omission. It wasn’t an ‘accident’ you drank our potion, of course. But even if we told you that, would you really be mad? Hell, you wouldn’t even understand anymore, so long as we had a sugar cube to offer you!

You had probably figured it out by then, but the formula’s effects were triggered by ejaculation. The more you came, the more it flooded your system and caused you to change. And it came with frequent arousal, all part of our experiments to make our horses better breeders. It could be reversed if you didn’t masturbate for a while. Your DNA was in flux, after all, and without the infusion of more equine hormones, you would revert. We told you we would need to keep you here over the course of weeks or months to make sure your transition was safe. You protested, but I could hear the desperation in your voice. I knew the temptation would be worse with the smell of horses in your nostrils. But you’d be lying to yourself if that didn’t excite you, too!

Of course, we offered you some work to do around the farm. Take your mind off those urges, we told you. And you’d been bulking up nicely over the past few weeks. Arm muscles, leg muscles, and a sturdy gut. There was always labor to do on a farm, after all. Moving hay, shoveling manure, lifting equipment, and other simple tasks. You seemed a little hesitant when we told you not to spend too much time around the horses. Didn’t want to tempt you and all that. But you reluctantly agreed, and we put you to work. 

It was nice seeing how much you enjoyed it. Flexing when you thought we weren’t looking. Your hairy body slick with sweat after a long day. Challenging yourself to move faster and faster. You took such great pride in your work. It all added up, of course, the changes not yet stopping while you exercised your new prowess. It didn’t help your ego how much we teased you, of course. Rubbing your arms, teasing you to push yourself more, and remarking on how attractive your hairy body was. I could smell the horse sweat coming off you, though with all the horses around, it probably wasn’t as obvious for you. But the changes were slowly coming, and if you didn’t resist your budding urges, a horse’s body was going to be yours forever.

You smelled it before you saw it, of course. We tried to keep you away from one of them, but your nose was already much better. We kept a few around, of course, and it was amazing that it took you as long to find one as it did. Dummy mares set up for our stallions to blow off steam and for us to collect from them. Perfect for changing stallions to fuck away their humanity, something you found a little surprising. People did come to us for that reason, discovering the chance to be a horse and wanting to rut it all away. That spark in your eyes told me all I needed to know. Even if your mouth said no, your heart said yes to being a horse. And it would just be a matter of time. 

Of course, the smell of horse cum and mare pheromones was just too much for you to ignore. You’d been doing good that first week, not even masturbating as best I could tell. You still slept in a bed back then, and I know the smell of horse semen from miles away. But the moment you stumbled across the nearest dummy mare, you were rock hard. It seemed to take all you had to resist, and even then, your cock was likely to break out of your pants. So I made the offer. It wasn’t the first time I guided a horse cock to a target, of course. Hell, it wasn’t the first time that horses still thought themselves human before rutting in the stands. It could be a one-time thing, I’d assured you. Just to feel it once. It would set you back a little, of course. You’d change more. But if you were diligent, you could resist until the horse serum was out of your veins. That was technically true, but we both knew deep down that was never the fate for you. 

The scent of mare cunt and heat made your nostrils flare wider than they should have as you approached the dummy. You just couldn’t help yourself as you tried to get your cock inside, struggling with your size. You were a little embarrassed to ask me for help, of course. Having another man touch your cock was shameful, but I assured you I handled horses all the time. And it was easy for me to adjust the stand for you, to make it easier for your smaller body. In truth, your cock had changed so much that the grip against it was already perfect. The moment you slipped in, you were all animal in rut. I could see it in your eyes that all you cared about was the pleasure in your cock. The smell of mare in your nose, the warm grip, your balls slapping against the leather. It didn’t take you more than 30 seconds to cum, you poor pent-up stud!

I bet you didn’t even mind your sweaty horse smell as you got down off the stand. You couldn’t have cared, struggling as your larger hips made it difficult to stand erect. At least with the way your belly barreled, you felt more confident going without shirts. It was a miracle you didn’t end up tearing the one you brought with you. Not that you needed it anymore! The way your ass was growing, I knew you’d be going without pants soon, but all I did was smile slyly. That embarrassment in your expression was entirely gone by now. You were grinning like a fool, an animal that had just experienced it all. And the first of many times, though I bet you were telling yourself never again. 

I wish I could have seen the expression on your face the first time you snuck out at night to use the stand. I didn’t bother to adjust the height again, of course, knowing you’d use it. You weren’t the first person who couldn’t resist after the first time, and I knew you wouldn’t be able to last one day. Maybe you thought going so soon wouldn’t affect you again. Maybe you didn’t care. I was watching, of course, out of sight and smell. You loved it, unable to keep a very convincing whinny from your voice as you did so. Thinking no one heard you…such a naive horse! But I still figured you’d make one of our best stallions, especially with how easily you gave in!

Such actions always have consequences, of course, even to your devolving mind. All you had to do was resist the stand. One time, just to try it. But no more. Yet, you liked those mare pheromones just a little too much, didn’t you? One whiff was all it took to lure you in. Each time, just for a few minutes of pleasure. And all that was left as you pulled out your dirty cock was guilt. Afterward, I’m sure you told yourself no more. That it was the last time. That you could resist. All lies you used to excuse your next slip-up, right there on the same stand the next night. Such a good, horny horse!

Night after night, you used the stand, not caring about the mess you made. Surely you knew we’d check the collection bag for your sperm, but not like you cared. Nor did you think we didn’t notice the steady influx of changes. Your ass was getting so fat that we had to loan you our biggest pants. With a notch in the back for your tail, of course. You could even swish it a little at the flies drawn to your sweat, though I’m willing to bet you didn’t notice. Nor were you aware how much more you smelled like a horse. Your odor was particularly randy and easily recognizable, but I think your larger nose didn’t really find anything wrong with the way you smelled. And that bulge in your pants you thought no one noticed? Even our prized stallions would be impressed! It was a wonder you could even think through all the blood it took to make it engorged!

Of course, we all noticed the intelligence slipping from your mind day by day. You didn’t need to think to work, after all. All that lifting and pulling went well beyond anything a human could manage. And you liked that, I think, even though you were becoming more and more like a horse. Any doubts you had were challenged by our praise, surely. We cheered you on as you pulled wagons, flung bales of hay feet into the air, or went all day with only a feed bag to keep you going. Pets on the nose, brushing your hair, and even little surgery treats were all you needed as a reward. You made such an obedient horse, even then, as if I needed any more proof that I made the right choice about you!

I think the moment you stopped trying to hide your activities, any hopes for humanity were washed away. All it took was some choice words about your impressive stallion rod to bring it to attention. With your faded intellect, it was probably hard to see why it was so wrong to rut out those frustrations. That’s what a prized stud did best, after all! You didn’t even stop to think before you hobbled over to the stand and dropped your pants. It was such a nice, warm place to stick your stallion hood, and even using it once or twice a day was barely enough to satisfy you!

Of course, so little of the body you brought here remained by that point. Your ass was so big you couldn’t wear pants anymore. Your anus was black and puckered, a perfect equine donut that your flowing tail couldn’t quite hide. With that impressive tackle, I’d swear you were a stallion from behind. Your skin was pretty dark by now, and those peppering patches of horse hide were getting closer and closer together. You were thankful for it, though, especially with how it helped against all those biting flies! 

It was a wonder you could stand on two legs anymore with how heavy your chest and belly were. But it was your feet, I think, that gave you the most trouble. Shoes were forfeit, and the ground ached against your bare soles for a couple of days. But there was no getting shoes over those swollen middle toes. We had something for you to use in the interim, a sort of slipper that stuck to the bottom of your forming hooves. You seemed thankful for them, not caring about the state of your feet. Anything to help you walk, I suppose. There were so many other things you wanted to focus on, like showing off for us, or using the breeding stands! 

Your face was coming along lovely, too, and I think you liked it each time you walked by a mirror. Lips puffy and rubbery. Teeth longer, flatter, and yellowed. Your nose flared with a bit of white fur that you loved having petted. You were still a man back then, I think. Or at least you were still bothering to trick yourself into thinking that. Hell, you loved the way your mane blew in the wind, and I could see those ears flicking with interest at all the sounds in the stables. With that, it was just a matter of time before you found something new to pique your interest! 

I was surprised it took you as long as it did to look for real mares. You weren’t the only one who came for our ‘help’, of course. Where did you think we were getting the mare pheromones to tease you with? They were all like you, once, either aware of the promise of equinehood or too tempted once they had started down that path. You admired the stallions, of course, those that snorted and flicked their heads at you as you passed. And our many broodmares, some already fat with foal. But there were several that had recently come to us. Many former men, too, made such eager breeding stock. Aching for horse cock in their blossoming cunts for the first time. Begging for the day when they were big enough to take it. We have toys for them, you see, once their cocks were spent and their mare cunts began winking with need. A prelude for the real thing. 

It was one such former man you took a liking to, if I recall. He was further along than you, only by a few days or so. You likely wanted to talk to him the moment you saw him, though his muzzle made it impossible for human words. Not that your voice was much more human by that point, but it didn’t matter. When I picked him out for our program, I had him pegged as a mare from the get-go. You’d be surprised how many men felt better as a mare, even with the allure of possessing a horse cock. Any previous hesitation over the loss of his sex was erased the moment we teased his new cunt with a horse-sized dildo. The look on his face was divine, and he didn’t even mind that the session caused his eyes to shift to equine rectangles! He would often swish his tail in agitation after that, clearly wanting more. Though he wasn’t big enough for one of our stallions, at least, not yet. 

It was his pheromones we used for the stand you loved it rut in, you know. Of course, even if your mind didn’t, your body did. Just looking at him got you all riled up, and you surely wanted to get into his stall and up close and personal with his blooming mare’s cunt. But you weren’t large enough, not yet. At least not until you fucked more of your humanity away on the breeding stands. 

If you weren’t aware of your goal before, you were now. The jump mares in the stables were far too large for the man who came to us weeks ago. But for the stallion he was becoming, they would suit that purpose. You were jealous of them, I think, the other males that used the jump mares with such skill and ease each day to get off. It was already so hard for you to use the shorter one without help. Your fingers were getting stiffer each day, and while we had tasks around the farm that didn’t require them, you couldn’t use the breeding stand without help. And you weren’t quite big enough to manage on real ones, at least, not yet. 

By that point, you had put your complete trust in me. Let my warm hands guide your cock into the stands when your fingers could no longer manage. You appreciated it, whickering your approval when you could no longer speak. Often, I would give you treats that you devoured readily. Rubbed your nose and mane before and after. I even cupped your balls from time to time, reminding you of your power. Your body shivered each time, and I knew that each session would produce a virile load worth thousands.

The changes came faster for you after that, though you were all in now. Your current state was not cut out for working, but you were well beyond that. Besides, we were now in the process of training you for your new breeding role, after all! Humping and humping that humanity away and looking ever more the handsome stallion. Your hide coming in, dappled and pristine as we brushed you regularly. Your mane running down your thick neck, it, too, was regularly brushed. You snorted the first few times it got into your eyes, though I think you got used to it soon after. And your massive tail now brushed over your ass, at full length now, while the rest of you slowly caught up. 

Of course, by now, you’d forgone modesty, not that you had much of a choice. You were well beyond the size for clothes already, not that your horsey hide needed them. You’d had a few accidents, of course, your tail raising and dropping a load of manure before you realized what you were doing. It must have been shameful the first few times, though you were rapidly outgrowing the outhouse. The other horses all did the same, after all, their waste somewhat curious with smells that had once eluded your human nose. And with all the water you needed to drink, there was little time to hide away as your dick came out to let loose a stream of piss. Soon, the smell stopped bothering you, and the look of embarrassment in your eyes stayed absent longer and longer until nothing remained to denote you’d done anything wrong. 

I couldn’t help but admire your progress over the next few days as the mare’s hindquarters served as your motivation. Your proportions were still off; human legs were not meant to carry a beast of your weight. Hooves were half-formed, and there were moments when you panicked at the loss of your digits. One of us was always there to convince you otherwise, that your hooves would help you mount mares. It was hard for you to rationalize at first, I think. Your mind was still in flux, knowing what it wanted but still feeling some guilt. Yet, as your belly barreled, your face pressed out, and your legs adjusted to allow you to better stand on your thickening hooves, such doubts began to fade. I bet it felt natural, didn’t it? Not that you had your voice anymore to protest otherwise! 

We had to help you to the stands multiple times a day after that. Each time you rutted them added more bulk, more muscle mass. More muzzle length and more equine hide. You would always need our help without hands, of course. But I doubt you cared by then! The warmth of gloved hands over your cock always got you all riled up as your flared, rubbery nostrils drank in that mare’s essence. You were coming along so well. Finding it so much easier to manage that muscled girth. You had to be over a thousand pounds now! Such a virile stud, so eager to eat and graze and add on that extra weight. Then a session to the breeding stands to rut more of the stallion into you. I knew there was a horny beast waiting under the surface, and I’m glad our serums were able to bring it out! 

I wasn’t there to help you the day you finally gave in. But I saw it all on camera. As much as you liked the breeding stands, nothing beats a willing mare’s warm cunt. He was waiting for you, his own changes having made him ready to take a stallion. Maybe a full beast would be too much for his first time. But you were big enough to take him on your own now. And he wanted it, raising his tail and pissing his need. How your lips flared and your nostrils took in his scent! It must have been driving you mad. He was so far gone and so desperate for the stallion you had become.

It took you some struggle to mount that first time. The way his tail was hitched left you little doubt as to his desires. You snorted, all beast in action as your smaller lips lapped at his cunt. Surely, it tasted divine, speaking of his need. But with how hard your cock was slapping against your belly, it surely hurt to hold back. By now, your hind legs were sturdy enough to hold your weight as you scrambled with your mostly fully formed hooves. Breathing in his need, your turgid horse cock careened off his rump a few times, inexperienced and smaller as you were. But you had been practising for this moment for some time now. And with careful determination, you eventually hit your goal. 

I can’t imagine what it must have been like to crawl up his back for the first time. Feeling his virgin cunt taking every inch of you. Gripping on for dear life as you found your posture. And then thrusting, thrusting, until all the world became pure bestial need. You had been waiting for this moment, I think, ever since your eyes first lingered on our stallions. And now it was here, fucking yourself away into an eager mare. Bodies frothy with sweat, the two of you fucked and bred like the beasts you were. Skulls compressing, minds flickering on the edge of humanity and reason. Yet, in the heat of passion, there was nothing worth retaining! 

You were growing all the while, of course, your mate expanding with you. Literally fucking the mare into him, like he still had any regrets! He’d wanted it this way and had his eyes on you this whole time. Now those eyes were fully equine, and the direct stimulation to his sex was enough to push him the rest of the way. I bet he was happy to have the last fringes of his humanity fucked away by a beast like you had become. Any doubts were washed away as you bred the humanity out of him, now her, and she trembled with her first equine orgasm from penile stimulation!

There wasn’t much left of you, either, not that you cared. While you would need a few more fucks to finish the changes, you were all stallion in mind as you bred. Trying to bite her shoulders, humping far faster than any human could manage. And you had no reason to hold back as your cock throbbed and blew your virile seed into her new womb. Falling out of her, the scent of your leaking semen was pleasant, and you drank it in as she happily swished her tail over her cunt lips. A happily bred mare. And you, a few fucks away from your body swelling the rest of the way into a horny stallion. No going back now for you. Not that you cared, you lucky stud!

Now we spread your time between the breeding stands and the mares, something you never seem to complain about. Of course, you preferred the mares, especially the first one you fucked. She was already impregnated with your foal, but that didn’t mean she wasn’t willing to present to you whenever you passed! But there were plenty of willing holes to satisfy your cock whenever it slid out of its sheath. Sometimes a curious stallion wanted to try your rod as well. You didn’t care, just like the animal you are. Each one like you, once. All had come here with equine aspirations, to fuck it all away for the bestial simplicity that came from life in the barn.

And now there’s little left of the human you were inside that horny stallion. A massive, sweaty beast to be guided to the breeding stands whenever your dick slides from your sheath and slaps against your belly. Maybe enough to remind you that you were human once. Perhaps even a little regret. Nothing that a sugar cube or a rub on the nose couldn’t erase. And then it was back to the breeding stands for you!

You really did turn out to be one of our best breeders. Such a horny horse. So compliant. So eager to please. You made a better horse than you ever could have as a man. A randy beast needing to empty those massive balls over and over. The moment I first gave you our potion, there was no going back from your equine fate. But even if I didn’t know you in your old life, I’m sure you’re happier now. You loved having your mane brushed. Loved gripping your sugary treats with your pliable lips. But most of all, you looked with excitement at each new recruit, be they eventually stallion or mare. Your cock hanging below your belly, slapping in anticipation for when they would join you, and be big enough to engulf your massive maleness in a warm hole…