At the beginning of the year 2020, around the month of march, a group of scientists, under supervision of the military, started the research for a chemical agent, specifically made to be applied or injected into missing or damaged limbs in order to make them regenerate and grow back.
The agent was made with the DNA of specific reptilian life forms, and was tested on volunteers and criminals that already suffered from missing limbs or were willingly (and in some cases unwillingly) amputated.
The first signs showed a great success, missing arms, legs and fingers slowly grew back in atleast 12 hours, without any form of side effect. Atleast, that's what the scientists thought.
After roughly 36 hours from the administration of the agent, each test subject suffered a transformation, skin turned to scales, tailbones extended into large reptilian tails, nails turned into powerful claws that could pierce through almost every single form of metal, feet turned into reptilian paws and in some cases fusing into serpentine tails, and faces hideously turned into reptilian snouts.
Each test subject turned into a humanoid reptilian creature, with great agility and strength.
Attempts to contain those creatures failed, despite losing the ability to speak, they proved to have a superior form of knowledge, which they used to break out of the containment chambers.
It didn't take long for the military to get involved, looking through the security feeds of multiple facilities, they were shocked at what they saw.
Those "lizardmen" and "lizardwomen" as they called them, bit, scratched or even fucked the researchers, the males had two large reptilian dicks, almost always leaking with reptilian cum and fully erect out of a internal sheath, all of the males were tall and muscular, able to lift a car with ease, meanwhile, the females weren't as tall and muscular, but they were slender and very agile, despite being reptilians, they still had breasts, most of them being D-cup sized or E-cup sized, constantly leaking with a substance similar to milk, and their reptilian slits constantly leaking with juices as well.
The military had to watch in utter horror and disgust as one of the lizardmen forced open a door leading to the chamber of a married couple, who were making out on their bed, the lizardman quickly pounced on the female researcher, forcing the male researcher to jump out from the bed. The man had to watch in a mixture of fear and confusion as the lizardman started fucking his wife, forcing one of his reptilian dicks in her clit, while masturbating the other reptilian cock. It didn't take long for the lizard to ejaculate directly inside the female, some of his cum landing directly in her mouth with a proud growl.
The soldiers who had to watch the mating between the lizard and the human female thought that the researcher was killed by the sheer power of the lizardman, however, they were proven wrong when they heard her let out a moan, she ripped open her lab coat and started fondling her breasts, which grew as large quantities of milk leaked out, desert brown scales quickly started covering her entire body, her legs almost instantly fusing together into a long snake tail, her nails turned into long claws, her hair fell off as the scales traveled up to her head and face, slowly changing into the snout of a cobra. Within a matter of a few seconds, the female researcher turned into a lizardwoman, specifically a serpentine one, who kept fondling her breasts with one clawed hand and caressing her newly developed cloaca with the other.
The male researcher tried to run away from the lizardman and his newly transformed wife, but he was quickly stopped as the lizardman pounced on him as well, he let out a panicked scream, however, it was quickly cut off as the lizardman forced one of his cocks in the human's mouth, letting out pleased growls in the process as he felt the human trying to push him away, within a matter of seconds, the lizardman came into the mouth and face of the male, visibly pleased as he retreated, watching the human cough most of it out, the lizardwoman only watched with curiosity, still rubbing her cloaca.
The man quickly started transforming as well, thrusting multiple times as he came multiple times, the lizardman approached the human again, and ripped his clothes off, giving the military a clear view of what was happening to the male. His entire body was becoming feminine, he quickly developed D cup sized breasts, his dick and testicles shrunk and disappeared, leaving a reptilian clit behind as swamp green scales overtook his, or rather, her body. Her feet turned into reptilian paws, her tailbone extended into a long and slender reptilian tail, her face turned into a crocodilian snout. The newly transformed lizardwoman left a pleased growl as the lizardman started mating her again, the serpentine lizardwoman joining as well.
Some of the soldiers were speechless, others were on the verge of vomiting, it wasn't over, they then had to watch a lizardwoman seductively approach a human female, who was pinned in a dead end, the female lizard, who towered over the female researcher forced one of her breasts in the researcher's mouth, forcing her to drink a large amount of her reptilian milk, letting out a seductive hiss as she felt the researcher try to push her away. In a matter of seconds, the still human researcher suddenly stopped as she suddenly buckered her hips, a large patch forming in the middle of her jeans, the lizardwoman forced them open, revealing that the female researcher developed two reptilian dicks, the female lizard left a pleased growl as she started licking both of them, the muscles of the female or rather, male researcher grew, brown scales covered his entire body, his shoes bursted open, revealing muscular reptilian paws and lastly, his face turned into a reptilian snout. The newly transformed lizardman left a powerful and deep roar of triumph as he experienced his first ejaculation as a male, only to then mate with the female lizard before him.
After those videos from the camera feeds, the military were informed that the lizardmen and lizardwomen broke out of the facilities, along with destroying containers and canisters which kept the chemical agent, releasing them into the atmosphere and polluting lakes connected to the water supplies in nearby towns.
Some even claimed that the lizardmen and lizardwomen started to adapt, developing wings and fins, making them capable of flight and swimming.
The military, left without an option, sent a global emergency broadcast, hoping to save as many civilians as possible, but it was already too late, the lizardmen and lizardwomen were already across the entire world, increasing their ranks with each passing second.
Who are you in this apocalypse? One of the reptilians? A soldier fighting against them? Or a simple civilian, trying to survive?