It wasn't like you were a creep or anything. Who would pass up a chance like this? A horse boarding area, completely empty and unguarded, and very dark at night… And it wasn't too far from where you lived…
You were trembling with fear as you hopped over the car gate. Your heart was totally gonna explode… You didn't think you were afraid of being caught, but it was just fairly scary overall. It was pitch black, and all you could hear and smell was horse. You'd been hard since you left home, thinking about what you were gonna do, and your cock only seemed to get more and more excited as you approached the stables.
You had been here several times before with a friend. He owned a horse here, an enormous boy named Gilly. Gilly's nuts were each the size of your head, and his huge ass jiggled as he trotted around… Seeing his balls swing around… His huge muscular body, his cute tail swishing every so often. His face nuzzling up against you…
You'd dirtied several cumrags getting off to fantasies of you and Gilly, most of them involving you becoming his permanent fuck slave. You were enamored with horses, you'd seen tons of porn of them online, read stories, dreamed of them… And now you were getting closer to Ginny's stable… It was a bit hard to pick it out among everything else (you had been too scared and maybe too stupid to bring a flashlight), but soon you were standing in front of him. His huge head peeked out over the gate to greet you, and you gave him some affectionate nuzzles. He had clearly been waiting for you to come suck his nuts.
You spent some time just nuzzling and kissing him, feeding him hay from the bucket near the gate. You loved the feel of his lips and tongue on your hand… On your mouth… Mmmgh… T-tastes weird…
He kept shoving his fat horse tongue down your throat, f-fuck. You choked on it several times but continued trying, jacking yourself off desperately through your shorts as you made out with Gilly. He tasted so strange, very earthy and planty, so warm and slick with gooey horse spit that you greedily swallowed, oh God I'm swallowing this horse's mouth ffuuuck… mmmmghh… 
You broke away finally as you needed air, almost on the verge of cumming. You didn't want to cum yet… You had only just got here, and you had resolved not to cum before Gilly does. You were gonna milk him dry, drink every last drop of his thick horse cream and then guzzle his piss and offer your ass as a toilet for him, just like a good horse cock slave, and… A-and…
C-calm down… You weren't even in the stable yet… You carefully undressed and set all your clothes inside your backpack, leaning it up against the hay bin. The night was fairly cold, and the wind suddenly blew across your fur, making you shiver. No one was around…? It didn't seem like it. Only the quiet rumbles of horses every now and then, the occasional passing of a car. The stable was surrounded by a huge hedge of bushes, so no cars would be able to see in from the street.
“Alright, boy, I'm coming in…” You whispered. You reached for the gate latch and unlocked it, flinching as you pulled it open with a terribly loud creak. You slipped inside as quickly as you could and spammed the gate shut rather loudly, hearing the noise echo throughout the stable. Fuck fuck fuck fuck…!
…
…
You couldn't hear anyone coming. And… People came here at night. You'd been here with your friend before, right as the sun set. Nothing unusual.
Gilly's pen was enormously warm and stank highly of animal. The ground was littered with straw and waste. The dirty smell and the dark shape of the stallion before you made you feel very dizzy, and your cock throbbed with excitement. You were here, you were really doing this! Go go go, what are you waiting for!?
...You wanted to choke on horse tongue again, so you went up and nuzzled his face some more. He pressed up against you too, and soon his lips were on yours and your throat was filled with slick fat horse tongue.
“Gggrk…” Slurp slurp slurp. “Mmmhhh, oooh…”
You could barely fit it all in your mouth. He kept licking the inside of your mouth and throat, torrents of horse saliva pooling up that you desperately swallowed, savoring the taste of the hay and… Whatever else he'd had to eat. You didn't want to think or feel anything but him, his entire body, you guzzling all his fluids and leaving him satisfied until the next night.
Eventually you managed to break away again, gasping for air and spitting out heavy globs of spit. Gilly whinnied a bit, almost as if to laugh, and nuzzled your side as you recovered. You'd seen videos of people making out with horses before, but gosh…
“W-well…” You gasped, petting the side of his face again. “I'm gonna go suck your meat dry, Gilly. Is that okay?”
He nuzzled you again, and you took that for the yes you needed. You slowly moved to his side, petting his rippling and twitching body. So big… You wondered what it was like being a horse. You'd definitely want a cute boy to slobber on and cum on all day. You had to do your best to provide that service for Gilly!
You knelt down and scooted underneath him, sitting directly under his massive belly. You were no doubt knee-deep in horse piss and shit… Just like a good slave should be. You secretly wished you'd be unable to leave here, that you'd be caught sucking Gilly's cock and forced to serve as a slave for the entire stable.
F-fuck… No cumming yet…
You tore your hand away from your cock and leaned up to grope your most favorite things: Gilly's massive balls, no doubt churning lots of horse cum for you to swallow. You nosed his sheathe and inhaled deeply as you gently squeezed his sack. I-it smelled like piss… It reeked of horse piss! You shoved your face as deep into his sheathe as you could, sniffing desperately. Please piss on me! Use me as a dirty pissrag, come on you stupid fucking horse fucking pee on me right- “Ahh… Aaaaah!”
Something slick poked out at you, and steamy hot liquid suddenly started gushing from it, soaking your face and upper body. You opened your mouth and greedily swallowed down as much of it as you could, sputtering at its disgusting bitter taste. Still, you were… You wanted to be a dedicated horse slave… And… Gulp gulp gulp… It d-didn’t taste all that bad, actually.
The stream seemed to never end. At this rate, you’d have no room for his cum. You backed away from his cock and let it all wash over you, splattering your face with dirty horse piss. It smelled pretty rank; he clearly need to hydrate, but you didn’t mind. If it came out of his cock, you wanted it. You lifted your arms as best as you could, wanting your whole body dirtied. It was so warm… M-maybe you could drink a bit more…
Gulp gulp gggglkkk- F-fuck… Gulp gulp gulp.
The vicious stream eventually died down, and you continued suckling on his cock, coaxing it further out of his sheathe. It was small at first, but steadily grew larger and larger, poking into your mouth rather desperately. You could barely see anything, only feeling his throbbing length sprout out, licking all along it and lapping up any last dribbles of piss you could get. Your stomach churned a bit from swallowing so much, but you wanted more… Ooh gosh, he was getting really big… You couldn’t even wrap your hands around it now. It kept growing and growing, fuck, it was so big, of course this horse would have the thickest fucking horse cock ever… You kept squeezing it and licking it… It tasted so good, so warm and musky, fuck…. Cum all over me, horse! Bathe me in your fresh horse cream! I wanna taste nothing but delicious musky horse nut for the rest of my l-life, shit…
You moaned around the tool in your mouth as you came hard, coating your crotch and belly with more warmth. The piss shower had really sent you over the edge, but now you were definitely in for it. Cumming before your horse master meant punishment! You'd have to bathe yourself in his hot horse jizz and offer your ass to him as apology. You shuddered at the thought of this enormous bitch-breaking horse cock taking your virginity. You knew better than to actually try it, but you wanted it so bad… How did mares even fit this thing inside them? So lucky… You might as well not even have a cock when compared to this thing.
You continued desperately sucking him off, trying to fit as much of him in your mouth as you could. You wanted to be a condom for this beautiful horse cock, filled to the brim with gallons of cum, cum cum cum cum cum….
It was getting harder to think, now. The complete lack of light and intense animal smell were sapping you of all common sense. All you could feel was your horse master. You started stroking his meat as you sucked on his tip, hoping that would coax your meal out more quickly. H-huh… You felt so submissive for some reason… B-but, this was what you wanted, and you also had to milk him extra hard as apology for cumming early… You worked his shaft harder. Surely it didn’t take too much for a horse to cum. You’d seen how easily they spurted before.
His cock kept growing and growing until it was fairly enormous, a huge rod of pure cock meat that was almost as big as you. You couldn't suck it anymore as it was too big for your mouth, but you didn't question this strange growth at all and continued blindly worshipping this glorious blessing of nature. And soon, your efforts were rewarded. Gilly whinnied as his monster cock gave a heavy throb and started gushing horse jizz, spraying your face and upper body with thick hot ropes of delicious horse chowder. It tasted so good, so salty and heavy, filling your body up just right. You pressed your mouth to his gaping urethra and swallowed as much of the steady stream as you could, smearing warm nut across your chest, reaching down to roughly finger yourself, imagining being tied down, your ass completely given to this horse, oh fuck… You wanted more of this, you wanted it on you and in you, fucking dirty horse slut, cum on your eager slave silly horse. I'm just a dirty condom for you to jizz in whenever you want, keep cumming ooh god… f-fuck this is so much… Ggggllllrk…
The stream never seemed to stop. Yes. This is what you wanted. A life of guzzling load after load from this beautiful creature's monstrous fucklog. Maybe it was so potent that you'd get pregnant. A breeding tool for this horse. You'd be strapped to one of those fake mares, your ass used over and over again by every horse in the stable. You wanted to know nothing but cum.
Cum cum cum cum cum. So much horse cum… Your belly felt so full. It was no doubt sloshing around inside with all the horse fluids you'd ingested. You were so glad you came here. You never wanted to leave. You'd always be by Gilly's side… Please keep cumming, Gilly. Give me everything you've got!
Eventually the stream did slow, and you moaned pathetically, gulping down whatever else you could get until it finally stopped. You sat there in a heavy daze, gasping for breath. You could still feel his huge dick throbbing before you. It was so massive. Did horses really get this big? It was almost as big as you… Maybe bigger… You couldn't see it, after all. But you gratefully pressed your face to its drooling tip, lapping up the last dregs of nut. This was your owner now. This cock owned you. All you wanted to know was this cock.
As you continued pathetically suckling and nuzzling your new owner, you felt a strange sense of foreboding as it continued to get bigger. At this rate, there wouldn't be much room for you down here. You'd be crushed by a hyper horse dick. ...Doesn't sound too bad… You wondered how many people had been crushed by Gilly's big dick. Maybe your friend knew all about it, and purposefully coaxed people here to play with him. You hoped that was the case. You'd never see him again, anyway, so it would be nice if he didn't miss you much. You hoped nobody would miss you much. Everyone would not their heads and agree that being a horse's condom was the best thing that happened to you.
Nuzzle, nuzzle… Such a strong, throbbing log of meat. You'd definitely have to work hard to keep it happy. And it was still hard! Guess it was about time to start working it again. But as you pressed your face to the tip once more, you didn't really feel anything. You leaned forward more, and suddenly things felt very very hot and slick. W-what was going on? You couldn't see anything… What happened to Gilly's dick?
You kept moving forward a bit and ran into a fleshy wall, making you realize that this was… You pressed your nose to the wall. It smelled heavily of horse cum and piss. Y-you were totally inside Gilly's cock! It had gotten so big that now you could fit inside it. Now you could serve him inside and out! You kept wriggling inside, feeling your entire body swallowed up by complete warmth. The cock itself seemed to throb hard, helping you along a bit. You couldn't hear anything but slight schlicking sounds as you moved forward, and all you felt was a very comfortable wet warmth. Pitch blackness, the scent of horse nut surrounding you as you wriggled further. Nagging thoughts of what the fuck are you doing faded further and further away, until you felt yourself arrive at a spacious place. You dove forward into a huge wet slop of cum, supported by some sort of plushy, stretchy sack. You were totally in his ballsack… Some sort of huge reservoir of horse baby juice. That wasn't how balls worked, right…? But once again, all your rational thoughts flew out the window as you sunk further into the warm cream, feeling nothing but pure warmth, hearing the comforting beat of Gilly's heart and the sloshing of his seed. Hmmmgh… This felt like some sort of goopy bath… So warm… So warm…
The further you sunk in, the less things started to feel.
Warm… Warm warm warm warm…
…
…

…..

“Huh…” The stablehand scrunched his nose at the sight of Gilly's stable. The horse was standing in an unusually large puddle of thick semen, casually slurping on water as his work was observed. “You, uh, had a little episode or something? Boy…”
Guess he had to clean it up. As he moved to grab Gilly's harness off the wall, he nearly tripped over some bag sitting next to the hay bin. What the hell was this?
…
It was just full of rather ugly and dirty clothes. Maybe it belonged to Boss… Well, no. These were too small. The bag was nice, though. He threw the clothes away and put the bag on, adjusting the straps for his back. Nice! This would probably help out a bit.
Alright, time to clean up.