You raced through the labyrinth wildly letting your instincts take hold over your rational thought. Each had a dirt floor and brick walls with torches lining them for light. Some areas of the areas were flooded and you found yourself trudging through water covering your talons. Once you got to the other side of a heavily flooded section like this you sighed having no success. You hadn’t a clue where you were or even if you were on the trail of a human, and you more or less just raced into darkness hoping to find a human just randomly cowering in fear.
The room you found was an four-way intersection, and two passages that traveled downwards and were completely flooded from floor to ceiling. You figured that it was about time for a break, so you and your brothers decided to sit down and take a drink of muddy water while you squatted down and push a few large logs of shit out of your tailhole. Not once did it occur to any of your feral minds what could’ve been in that water, and in fact you even laid down on your side and licked your puckered anus after you rubbed it against the wall of the labyrinth for a few seconds.
Your cocks remained unsheathed the entire time, but flopped over at half mast because of how tired you felt. After you finished cleaning your asshole your looked to your siblings and you heard their voices in your mind.
"Shall we continue the hunt for master?" The one on the left asked and the other added,"Or shall we rest here and bond as one?"
Your two heads looked to each other now and grinned mischievously, and they slowly approached one another until there was a heavy boom in down the only other hallway you haven’t explored yet. Curiosity lead you to peek around but nothing was there, then suddenly the water drained out from the room around you and the other two rooms because traversable. You tilted your head then stood up slowly, and you heard one of your brothers growl and poke his nose around in the mud then nudge you.
You didn’t mind that he was smearing mud all over your scales, and when you looked down you saw footprints that were unmistakable. The five toes, the long shape, and the noticeable heel in the indent in the mud below your feet,"H-Huuumannnn...." You purred to yourself grinning a wide sinister smile across your snout.
The tracks were fresh, and whatever it was couldn’t be less than a few minutes away from you and your brothers. Your cocks stiffened with excitement and you gave a small nod to your brothers, and started off down the unknown passageway. You might be feral but your heads knew their place attached to your body, and as one kept track of the footprint trail, the other checked the walls for human sized passages for any possible human cowards hiding from your presence.
Before long you came to a long passage, and in the distance as clear as day was a man scratching at the walls and trying to get away. The passage had collapsed ahead and had now become a dead end so he had nowhere to run. He appeared to be digging through the dirt as a last resort desperate attempt for escape. It hardly mattered in the long run whether he knew you were there or not for he was trapped between you and a wall of rubble.
You grinned and licked your lips before you and your brothers let out a dominant roar, and the air throughout the room vibrated as you announced your presence. The human spun around and saw you standing in front of him just a few yards away from him, and he fell over onto his rear in front of you. Your eyes locked for a moment and you drooled a bit as you saw him cower before your might and lifted your claw up over him.
"Wait! No-!" The man screamed but was cut off as you pinned him under your claw, his head between your toes as you brought your head closer and snarled at the man.
The man gagged and almost puked where he was, and afterwards he looked into your eyes and whimpered,"P-Please d-don’t...."
You emitted a low growl from your throat and squinted at this man, and this caused him to gulp. "D-D-Don’t you h-have any h-humanity l-left in you b-big guy?" The man asked, and your two other heads stretched down and glared at the man.
"Uh... g-guys...?" The man added nervously then he cleared his throat nervously and said,"L-Look I-I don’t know h-how to turn you back, b-but if you could c-collaborate with me I-I think we can... y-you know... escape? It’s just... I-I don’t w-want to end up a d-dirty horny b-beast..."
"So weak," one head commented and the other added,"Too many words, and he isn’t master..."
You then smiled and replied to your brothers,"Let’s fix him, like the dirty horny beast he shall be."
You then proceeded to slowly release your man from beneath your claw. Normally you would just tear his head off and devour it on the spot, but your master wants you to convert him not feast. For a moment the man looked up at you in relief and said,"W-Wait are yo-" The man was then cut off again by your claw as it came down upon his upper body and the man started to flail and struggle. This was when you saw the man's cock and your brothers moved closed to inspect.
"So small, how does one breed with this puny thing?" One asked.
Your other head licked the human's crotch and smiled and you felt his cock twitch as he replied,"It’s real though, sweaty, musky, hard, with a hint of excrement below his seed sacks."
"Master wants him fucked, so we shall breed, breed him, brothers spread his waist and make him wide for me." You exclaimed and immediately your siblings nodded and lightly bit down on the human's legs and pulled them open nice and wide as you lifted your claw. The human screamed and thrashed around, but he couldn’t do anything as your brothers pulled him close and wide for you. Then finally you pressed the tip of your cock up against the human’s ass, and just the feeling of the warm fleshy asscheeks around your head prompted your shaft to stiffen and you groaned as a small load squirted out from your reptilian phallus. The man was covered by both cum and precum, and your brothers released the man and chuckled as he scrambled away from you as fast as he could up the wall of rubble.
"Eugh! Get away from muuuagh!" The man gagged suddenly and a large forked tongue that look exactly like yours rolled out, along with a long slimy stream of drool down the tips of it.
The man was horrified, and he screamed and started shouting gibbering nonsense at you before he bit his tongue and crimson red scales started appearing on his hands and feet. You just laid down on your side in front of the man to block his escape, and you lifted your legs to display your cocks for him with a wide toothy grin on your snout. With just a single glance at your shaft and humongous scaled testicles the man’s own cock stiffened and he let out a muffled moan and orgasmed on the spot, spraying himself in the face with globs of his own seed.
"So small and weak..." One of your heads commented and the other added,"So cute, so horny..."
Then you smiled as the man's hands and feet turned into claws like yours, and he lost his footing along with his heels causing him to fall forward and roll into the base of your shafts, where your ballsack met your sheath. The man’s face and tongue hit one of the veins on your dick, and as soon as he recovered he recoiled but then moaned as his own cock twitched to life.
The human looked so cute as he tried to refuse his fate, and he stumbled around on his quadrupedal claws in the mud multiple times as the scales continued to spread across his body, removing all of his hair on contact and making spikes grow.
Your cock twitched now and you growled as your feral lusts started getting the better of you. Your brothers felt this drive as your cock twitched and each of them snarled, commenting things like,"So hard... so cute... must.... breed!"
Within seconds you slammed your claws down and stood back up and approached the puny half-human creature, who looked so scared and confused as he stared up at you. You could tell he wanted this, maybe not as much as you, but in the end you both knew what would happen. You stretched your long neck down and licked the man’s face, as he started developing a snout and horns. "Wha aur yu ssschayin?!" The man spat at you as his teeth grew larger, sharper, and his neck stretched out to almost serpentine proportions.
You nudged the man motioned towards the collapsed wall, and purred as you licked your lips. "Huh?” The man muttered and you nudged him again and he whimpered,"I-I canno pweathe ssthtooop, I do-" You growled at the man and smacked your head against his body from the side, and his body turned a hundred and eighty degrees towards the rubble of the cavern.
"Wha?! I-I ca-" The man shouted then you stuck out your tongue and licked the man’s ass and smiled as you tasted the sweaty musk between his cheeks. The man tried to protest, but his mouth by this point was unable to speak words so he just growled and yapped. His body started gaining mass just like yours did, muscles growing to peak perfect, and a small appendage poked out from just above his gaping ass.
"Do it, Do it, Do it..." The voices of your brothers and your master chanted in your mind, and echoed over one another as you got closer and closer to the man. You placed your claws upon the man’s ass as his puny tail wriggled its way into existence, and you pulled yourself up into the man’s body and thrusted forward with your massive cock into his rectum.
At first you weren’t getting any progress, but as the man grew out larger, wider, and stronger you managed yo shove the tip of your phallus into the man’s tight asshole. The man cried and screamed, at first struggling but then suddenly he growled and sprayed the ground with a hardy amount of seed from his growing balls and accepted his place below you.
Once he submitted to you, you lightly but down on the back of the man’s neck to keep a hold on him and you started bringing your rear forward and back into him in a primal thrusting motion. The man continued growing larger and larger, his tail growing out to the same proportions yours did and one of your brothers grabbed and held it up in the air to open up the man’s asscheeks as you plowed his dirty opening.
You growled and purred with your brothers as you felt yourself orgasm into the man’s tight ass, but your lusts were not quenched quite yet. You then watched as three additional heads sprouted up around the man’s central beastly one, two from his shoulders, and one just beside you on his back. With his heads came three new throbbing penises, that all stiffened and begged for release from the two beasts during their primal sharing of flesh.
The man’s body was now nearly as large as you, and he lifted your hind end up off of the ground with his strength. Then as you slapped the man’s ass with your balls and brothers' dicks something told you that it was time for the big release. That’s when you felt your new partner's ass clench tight and he and his siblings roared out in unison and filled the cave with their roars of bliss. Shortly after his climax came your own, and you felt the same glorious sensation as you did before, but stronger, fiercer, this sensation of course being the violent torrent of cum in your shaft. That’s when two beasts climaxed, filling the cave with sounds of love, sex, and brotherhood as their cocks sprayed out violent streams of cum that gathered around in front of the rubble and mixed together in one large sticky white in front of them.
You being the dominant beast smiled with pride at this as you accomplished part of your task for your master, and in the process gained a valuable partner. You felt spent nonetheless, drained of your vitality as your partner stood there and stared down at himself, eyes wide at what just happened. You then pulled out of your partner’s ass and he and his siblings let out a loud snarl once you did and all stared back at you with a submissive look on their faces.
Your brothers smiled at him, your right head chuckled as your left head stared at the large shaft on the beast that almost rivaled yours in length, almost. The central head of the beast whimpered and stared into your eyes and it seemed afraid of you in a way. You obviously seemed significantly larger than the other beast, not by overwhelming proportions but still considerably, and you slowly walked up to him and purred and you licked his face and chin clean of any cum on it from before.
This seemed to calm the beast down a bit, and with a simple nudge you were able to get him to follow you away from the puddle to a semi-dry area to lay down at the intersection you found before. The central head on the beast seemed completely bewildered as if he still had some humanity left in him, but as one of his brothers stretched out to clean his asshole, and another started sucking his own cock the central head moaned and started drooling over this like you did fucking him.
You walked over to your feral brother now and your heads started cleaning his front claws, removing any physical trade of semen as you looked into his eyes. You both stared at each other for a few moments, unable to speak without difficulty until you opened your mouth and said,"F-Frrrind h-hhhhuuuumaaaan, yyyyuuuuu!"
The hydra in his ecstasy nodded and licked your face, and you smiled and licked him back before you both started licking each other at the same time and were both caught up in a kiss. Afterwards you all felt tired so you and your new partner decided to rest for now before getting lost again in the labyrinth. Both of you panted and laid overtop of each other, taking turns and watching for humans with the same anticipation as before. Occasionally you found your brothers making out with his, sucking his cocks, and getting a nice taste of his ass. Vise versa also applied in this situation, you were both dirty sex beasts bound in a labyrinth and by your own affection. You ruled over him, but he would always have a special place in your heart as your first subordinate amongst your future clan of beasts as you followed your master.
Time passed, and eventually the two of you fell asleep, when you woke up...