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January 31th, 20xx - 11:45

_ Scientists of the whole world are buzzing around like bees as the fated hour came to a close. Four locations, four doses of serum and four animals, for the greatest experiment of all time led by myself, Doctor Nemolli. I am recording my observations in this journal as the head of the experiment. For decades I've been researching the subject of animals' intelligence and I've been trying to find ways to enhance it to give them a mind similar to ours. The theory behind the formula for accomplishing that feat was perfected on January 23th, and so began the production of the first serum prototype. I am positively confident that this experiment will be a resounding success, and so we will be testing on four animals at once. Today is the moment of truth, and finally the fruit of my labour will bloom, I expect today to be the day of the biggest scientific breakthrough for humanity; the possibilities are endless._

_ I am currently standing in my office in the laboratory X4, and I have four stations with many giant screens set up with cameras of each of the other four laboratories. I will be supervising the experiment from afar, so as to not miss anything._

_ Scientists are readying their pen and paper to take notes on the test subjects' behaviour. It is time for me to go, I'd love to continue writing, but the fated hour is drawing near and I have to say a few words to my colleagues. I'll be recording everything that has happened later on._

Noon came and the injections were made, everyone was holding their breath while waiting for the serum to take effect.

_ The first animal to react to the serum is the bat. It was sleeping until now, and it looks like it's getting agitated. I wonder if it can already understand us? Maybe I should be using 'he' rather than 'it' to describe it?_

The humans were watching him intently after they put a needle in him once again. It was noon and he was tired, he just wanted to rest, hanging upside down from the branch of a tree in his enclosure. His eyes opened and they fell on the white coated individuals upside down. His body felt so hot and his mind was racing; brain cells duplicated and connected together, opening a whole new world of thought for the bat, who was half confused and half amazed at the new depth of his thoughts. He was listening to the whispers of these furless creatures and was surprised that he could understand what they were muttering. His tiredness faded as he was listening to them talk with each other. He unfurled his long wings and spread them wide, revealing his body. He was covered in black fur, had membranous wings, sported a golden fur crown around the neck, long ears made for echolocation, and long claws that were made to grip on to trees' branches. All of this noise was really bothering him, he let go of the branch he was hanging onto and started flying away to a calmer place.

It looks like while the bat's reaction has already started, the salamander is getting agitated too! I didn't expect the effects to happen this fast, but I will be doing my best to record the historic events unravelling before my very eyes !

The salamander skittered in his glass cage. A few moments ago, the humans had put a needle in his back and ever since, it felt as if he was burning. No matter how long he stayed in the cold water of his aquarium, the heat just wouldn't fade. He had to escape, but how? There was no way a black and bright yellow coloured salamander like him could get away in this fully white building, especially when he was the center of attention. He was being observed and watched by a dozen of humans in long coats. He regained his composure and took a bit of time to assess the situation. He looked all around himself: in his aquarium, outside of it, at the humans, the laboratory, and finally at the glass between himself and his freedom. Even if he managed to slip away from his prison, his black skin with yellow spots would stand out on the whiteness of the place. He had determined that he had effectively no way to get out. But then, he realized something, ever since the temperature of his body had risen earlier, his home felt a little more cramped than usual. He was feeling extremely horny too, a need to breed that arose in him.

So far, nothing really relevant has happened on any of the animals, but they are all getting agitated. Well, any but the kangaroo. He looks extremely combative, I hope that it won't become a hindrance...

_ _

_ _ It was fight or flight for the kangaroo of the Australian laboratory. Ever since these guys had put their syringes in him, he had been seeing red. He was hopping around in his cage, trying to punch and kick anyone that got too close to his enclosure. Perhaps it was because of the infernal heat in his whole body, but he had places to go and things to do. Things like taking care of his raging erection that awoke moments ago.

I do not know if this is a side effect of the serum, but it looks like all of the animals are having trouble managing their libido. The orca seems to be in complete sexual distress...

_ _

_ _ The giant killer whale was swimming around in his giant basin, desperate to find a mate to breed with. The laboratory he was held captive in had an enormous water tank that was connected to the ocean, with a thick glass wall between the orca and freedom. Whatever the thing that the furless monkeys had put in him was, it made him crave for release now. Even though his thoughts were much clearer than before the injection, they were still foggy because he badly needed to fuck something. The orca's shaft quickly rose to full attention and his internal balls were aching so much from the need to release.

_ _

_ So far, there is no proof that anything is happening to these animals, but they all seem agitated and sexually excited. This is most definitely not the effect that we were hoping for. I wrote too soon, the bat seems like he's experiencing some sort of change, could it be what we're looking for?_

As the bat landed on a branch of another tree in his glass enclosure, something felt odd. Something other than the unbearable heat going through his body. He could feel his heartbeat echo in his whole being. With every one of those pulses, it felt as if he was getting closer to the ground. He looked around, confused and, wondering what was happening to him when a slight creaking sound drew his attention at the branch he was hanging on. It was bending under his weight and was dragged down in rhythm with the pulses of his body. He spread his wings wide and let go of the branch to fly away and try to find refuge on a sturdier tree. But something was odd and he couldn't gain altitude with the flapping of his wings He slowly lost height until he landed on the ground.

He looked around, confused as to what was happening to him. Never before had he fallen during a flight like this. The pulses of his body were getting stronger and then he suddenly understood everything. Every wave was making him grow a tiny bit, he had gotten much heavier because of his growth, thus preventing his flight. He tried looking at himself to confirm his theory by flipping on his back and not moving an inch. The ceiling seemed as if it was moving closer, which was exactly what he needed to understand the situation.

All of a sudden, the bat's bones creaked in his wings. Slightly panicked, the bat brought his arm in front of himself to look at whatever was going on. His talon was visibly shrinking in length while expanding in width, the bones of his index began retracting, with the membrane of his wings receding between the two shrinking fingers. As soon as the split was complete, his finger was separated from his wing and shrunk in the very same way as his talon did earlier. In the meantime, every muscle and bone in his wings were beefing up, growing stronger and larger by the second. His upper arm was elongating slowly and his forearm was shrinking at the same rhythm, it looked like his elbow was moving further away from his shoulder. By the time his upper arm and forearm were the same length, the two appendages that grew from his talon and his wing had become a thumb and an index. Fascinated by the prehensile nature of these new fingers, he experimented a little with them, and while it would take some time getting used to them, they were much more convenient than his talons ever were. There was one thing that worried him, though, it was that he would have much less strength in his wings now. As soon as his eyes fell on his wings, he stood corrected. Whereas his wing fingers were skinny and frail before, they were now quite large, thicker and felt much more powerful than ever.

This is astounding! The bat is growing and taking on an anthropomorphic form! Does this mean that they will gain the ability to think like humans too?

_ _

_ _ The salamander was running around in the island of his large aquarium. He needed a female to breed with, but there was none. He had to get out of here, but he didn't know how. He dove in the water and swam around, trying to find someone - or something - to fuck. The more he tried to look around, the less space he had to move around. His aquarium had looked like an ocean before, it was but a mere lake to him now. Little did he know, he had already tripled in size since he had begun his quest for a mate. His cock was already painfully hard and was throbbing with need, he had to do something. He knew there was no one to fuck here, he had to get out of his enclosure, and he knew exactly how. He went in the deepest part of his aquarium and swam full speed towards the surface. He leapt high in the air, higher than he was ever able to, and flew over the glass of his open aquarium. After falling on the ground with a loud splat sound, he took a moment to look at his surroundings. He saw the weird white creatures around him start to run around, and used the confusion to scurry away, trying to find some furniture to hide under. He looked and looked, but he just couldn't find anything that was big enough for him to get underneath. And that was when he realized that the white creatures weren't as big as he thought they were, and that the place wasn't as big as it looked from his aquarium. He glanced back towards his old home and it suddenly hit him. It was visibly shrinking around him; everything was!

He tried moving around but failed at it as his body was seizing up from the changes. All the bones in his body were moving around and changing. His chest was expanding in width, his whole torso flattened slightly, all while large muscles appeared all over it. His spine's structure was changing fast, moving his legs a bit towards the front and moving his tail towards his back. More weight shifted towards his tail while also making it lengthen and widen. Because of that change, his center of gravity moved towards his lower back. He pushed himself off the ground with his front legs and realized it was easy to stand on his hind legs. Just as he was thinking about how inconvenient it was to look around now, his neck thinned out and his skull rotated down to make it easier for him. He looked all around himself, realizing that he had grown to well over two meters, which was larger than any of the humans.

_ _

That is a quite large salamander. I hope that it won't see us as a threat, because he could easily overpower anyone in the lab, especially if he keeps on growing. Ah, it looks like something interesting is happening to the kangaroo. Is it trying to escape its cage?

_ _

_ _ The kangaroo grabbed the bars of his steel cage and violently pulled on them, folding the metal as if it were mere cardboard. He instantly hopped out of confinement and began destroying everything that he could. The humans around were running away from him, fearing for their lives. He boxed, punched and kicked everything in his reach. He felt anger and fear well within him, accompanied with an impossibly high arousal that made him even angrier and scared. He broke tables, threw chairs across the room, kicked into computer monitors, elbowed potted plants, and shoved the humans aside as he tried finding an escape. The marsupial was already big to begin with, but now he was huge. He was already standing at two meters and he was still growing, as if it was fuelled by his negative emotions. His raging erection was reaching to fifty centimetres, and it was already pulsing and shooting small strings of pre all over the place. He was so horny that he brought his hands at his erection and started running it up and down while he was trying to find an escape from this place. A door opened in the distance, he knew it was his chance. He heard the humans yell at the one that had appeared through the opening, but it was too late; he shoved them aside and ran away. The corridors of the place were as white as in the previous room, and it was extremely annoying for the kangaroo. He hopped and jumped towards the other end of the hall. The closer he got to the door there, the smaller it seemed to become to him. And the more he was having trouble running his hand over his shaft, it was growing slightly faster than the rest of his body, just like his balls were. He began punching at the door with one hand, but it didn't work. He tried launching himself against it, but that too didn't work. He tried kicking it. Nothing worked. He knew from the smell that came from the other side that he was right next to the outside. He was so close to freedom, and yet so far. As he was fighting against the heavy door, his bones creaked and shifted ever so slightly. His shoulders moved backwards, his chest puffed up, his upper arms elongated. Everything in his body was changing, every single one of his muscles were swelling with added strength. His punches were eventually able to leave small dents in the metal, but he still wasn't able to crush the door. His arms grew in width as they piled on muscle, more so than the rest of his body. By that point, the kangaroo was already reaching to four meters tall and his cock was reaching up to his muzzle. He wanted to take care of it, but he needed his freedom more than he needed release. His legs swelled with power as his calves and thighs elongated while gaining strength. His bones continued creaking and he had to stop punching as his shaft was growing past his head. Thanks to how strong and massive his tail had become, he leaned back to put all of his weight on it and launched his legs against the door with such strength that both the door pans were sent flying. He was finally free! He hopped outside and set off in the distance.

_ _

_ It was trying to escape from its cage indeed. I sure hope that it won't be able to escape the laboratory, for it might be annoying to find him again in the wild. For now, let us focus on the orca, I cannot wait to see if it's going to become an anthropomorph too._

_ _

_ _ The orca was trying to get off in any way possible. He rubbed his shaft against the sand at the bottom of the giant enclosure he was in, humping against it in desperation for a release. Because of how pent up he had been after the injection, it didn't take him long to reach an orgasm. String after string of cum flowed through his dick and was shot into the sand. Every one of his shots made his body pulse with energy, which slightly altered his skeleton. His shaft dug deeper into the sand with each time it fired cum. Small nubs of flesh grew on either side of his genital slit and were growing slightly bigger with each of the pulses. His side flippers elongated and the area between his pectoral fins and his head thinned out a little. When he pulled his cock out after his orgasm, there was a whole meter instead of his usual fifty centimetres.

Despite having reached release moments ago, the killer whale wasn't satisfied yet. His cock was still throbbing painfully hard, while leaking a mix of cum from his previous orgasm and pre from the incoming release. He swam around, trying to find something to fuck, to no avail. He went to the back of the tank, pressed his cock against the glass and began humping against it. Once again, it took him no time to reach another release. His shaft began shooting ropes of cum that flew off and then hovered in the water. Just like before, every jet was accompanied by a huge throb of pleasurable energy that made his whole body change. His cock was elongating, gaining tens of centimetres with each shot, and was firing an ever increasing amount of seed as his internal balls grew bigger, now making small indents in the skin undeneath his cock. His flippers elongated even more, thinning out at the middle as they gained a joint. The nubs on either side of his genital slit grew longer and they too gained a joint making those appendages look like underdeveloped legs. Every part of these changes were highly pleasurable to him, so much so that he wanted to get more. His whole body slowly flattened vertically while his neck thinned out and his skull rotated down. When his orgasm came down to an end, the waters in front of him were filled with the floating ropes of cum that he had shot. It looked as if there were thousands of jellyfishes in front of him.

While the previous orgasm had been very satisfying for the orca, it still wasn't enough to quell his libido. He brought his flippers to his cock and encircled it with them. As he started awkwardly rubbing his shaft, he realized that they had significantly changed in shape, they looked a lot like the arms and hands of the humans, even though they weren't fully formed yet. It was however very convenient to him as it gave him a way to work on his shaft other than rubbing it against the glass or burying it in the sand. He ran his newly changed limbs over the cock, delighted by the incredible pleasure it brought him. In no time again he was brought to orgasm and his dick began firing another load. The pulses came back too, making his whole body throb and bulge with power. His tail split down the middle, transforming into fully formed legs with powerful webbed feet at the end. His shoulders moved towards the side of his newly formed torso, moving his arms along with it. Webbed hands appeared at the end of his new arms, fully equipped with large fingers, which facilitated the working on his shaft. The pleasure from the orgasm plus the one that the waves of power that rocked through him was mind-boggling, he was getting drunk on it pretty fast. In very little time his cock rose high enough that it was in front of his snout, and so he began licking the tip as it fired his seed in the tank. His spine changed more, it took on a fully anthropomorphic shape. Muscles began appearing all over his body, making him grow thicker and more powerful with every one of his shots of cum. His biceps bulged with power, his shoulders grew in strength, his pectorals heaved forward and his abdominals were quickly going from a six-pack to an ample eight-pack. Every time his shaft pumped seed, all of his muscles expanded slightly more, piling on more strength and volume. His glutes grew stronger, his thighs expanded, his calves swelled and his tail muscle strengthened. It was all so highly pleasurable that the killer whale could have reached another orgasm on top of the one he was already having. His shaft had grown just past his head when it finally stopped. At that point, he was reaching to nine meters in height and his shaft was four and a half meters long, and one and a half wide.

_ This... libido of theirs... is quite impressive. I also learned that all of the subjects of the experiment are males. Horny ones, at that. It looks like the bat has gotten gigantic, I hope it'll eventually stop growing..._

By this point, the bat had grown to over a meter tall, which was about ten times as large as he was just a few moments ago. The pulses rocking his body were getting stronger and also began to become highly arousing to him. He didn't understand what was going on, but he loved every second of it. His cock grew erect over the span of a dozen seconds, though it kept growing harder even when he was fully hard. The changes that were going through his bones and muscles continued, affecting his legs next, his calves and thighs grew stronger just like his arms did before, his feet crackled as his bone structure was rearranged. His toes were already long before, but they grew even longer and much stronger. The base of his paws grew immense in size, gaining soft padding under his soles. His new feet were such that he could either suspend himself from a tree, given that he could find one able to support his increased weight and size, or stand on his two feet like the humans before him. It didn't matter much to him though, the only thing in his mind was to get off and breed. The horny bat brought his new hands to his ever growing shaft to start working on it. The addition of these new fingers was a blessing to him, he used those to carefully rub his growing cockhead. He used his large thumbs to scoop the pre coming out of the slit and spread the liquid carefully all over his shaft. In less than a minute, the bat had grown to two and half meters large, the head of his cock was rubbing against his chest which was expanding while piling on muscle. He wrapped his wings around the ever growing shaft and used his enhanced wing fingers to start working on it more efficiently. Pulses continued going through his body, making him gain muscle mass, height, cock length and width and ball girth. His legs elongated further and beefed up with more power into them, his calves and thighs expanded in strength. As his cock reached just above his chin, the horny bat began lapping at its head for as long as he could before it grew past his head and soon, ears. The final pulses that went through his body were the strongest and made him grow the most. With every one of these waves, he gained a third of a meter in height and his cock shot up even more than before. His glass enclosure was slowly getting too small for him and his shoulders were bumping against the back of his cage. For a few seconds after those intensely pleasurable pulses, the bat was left panting. He was surprised by a final pulse that made him grow to six meters in height, made his cock shoot up yet again to 4.30 meters long and 1 meter wide and grew his balls to half a meter each. Loud shattering noises echoed as the bat outgrew his cage completely with this last burst of growth. The immense pleasure that rocked his body with that wave of pleasure made him reach an orgasm and his cock - which was still wrapped in his wing membranes - began firing a torrent of cum all over the place. It pumped seed, shooting liters of the white sticky fluid all over the walls of the facility and all over the unlucky humans that were in the trajectory of the arcs of cum. Shot after shot was fired from his shaft, and the sheer pleasure that the bat felt was amazing.

After five more minutes of orgasming, the bat's cock finally stopped shooting cum everywhere. He stood up on his shaky limbs, and half walked half stumbled through the ruined lab until he reached a door. The passage was however three times too small for him, so he kicked into the wall to break it. He was finally free, and there was one thing he wanted to try. His enhanced wings. He spread them out, their span was absolutely gigantic, at least thirty meters long, and used his new powerful arm muscles to lift himself off the ground and enjoy his new freedom.

_ Though the bat's reaction to the serum was utterly unexpected, it was fascinating! We will have to organize a search party to look for wherever the bat has gone to. I'll get back to that flying fox later, but for now, it's time to go back to the fire salamander._

The salamander was reminded about how horny he was when he felt his shaft poke him in the chin. Almost instinctively, he tried bringing his hands around it, but as they were still as small as before. He had no way of stimulating himself using his paws. He quickly found another solution to his problem, though, he lowered his snout and opened his maw wide, taking the huge tip of his cock inside his mouth and began suckling on it. He lapped the many drops of pre that were pearling on the tip of his dick as he felt more changes go through his skeleton. His shoulders grew bigger, his forearms and upper arms both lengthened while all piling on muscles. His legs went through the same treatment, his calves expanded, his thighs strengthened, his glutes grew bigger. His paws were growing to match the width of his legs and to support the bipedal structure of his skeleton and the massive muscles that were appearing all over his body. He was too lost in pleasure to realize just how strong he had become, though he did feel his shaft grow bigger, fatter and reaching ever deeper in his mouth, almost poking the back of his throat already. His legs continued growing stronger by the second, so did his arms, his tail was growing bigger and longer yet again, and his cock was getting too large for him to handle. As soon as he let go of it, he encircled his arms around it and began humping in his own embrace. With every throb of his shaft, it grew bigger, reaching soon past his head. It was leaking large amounts of pre that dripped down on his body, adding streaks of white on top of his yellow-spotted black hide. He moaned loudly as he felt an orgasm rock his body, making him shudder as the seed began pumping through his cock. Shots splattered all over the ceiling as he continued bucking his hips into his own embrace, almost as if he was hugging his shaft. A thick rain of salamander cum fell down upon the entirety of the laboratory, painting everything with a thin coat of the sticky fluid. Most of the scientists had fled the place, the most reckless ones had taken shelter behind protective glasses and were scribbling notes on papers and a few were even accompanying the salamander in his carnal desires, driven by the thick musk of the amphibian's seed. By the time his orgasm had ended, the salamander had stopped growing. He reached five meters tall and his cock was three and a half. He let himself fall backwards into all of the seed that accumulated on the ground around him with a loud 'splat'. His cock flopped down next to him and he idly continued caressing it or licking it with his tongue as it continued spilling some more seed. The salamander looked at the humans and smiled. Surely it was them that had provoked all of this, he'd have to thank and eventually reward them.

Unlike the bat from earlier, the salamander seems to be much friendlier towards my colleagues. This hyper virility is an interesting aftereffect, though it might be a hindrance; we needed these animals to get a bigger brain, not a gigantic anthropomorphic form nor giant dicks. I suppose that as long as they can talk, it should be fine, but I fear that it might be difficult to deal with them. Speaking of difficult to deal with, it looks like the scientists at the australian laboratory were able to set up a camera to record what is happening to the kangaroo.

Running became more and more difficult for the marsupial because of how large his shaft and balls were becoming. After he had put enough distance between him and the facility, he allowed himself to rest for a bit. He tried using his arms to work on his cock, but it wasn't enough, his dick had become way too big. He got on all fours to trap his meaty spire between his chest and the grass below and began humping wildly. Since he had already been on edge all that time, it felt immensely relieving when he reached his orgasm. His massive shaft began shooting seed dozens of meters away while growing bigger and longer. Liter after liter of cum was pumped, coating everything in a cone in front of the horny kangaroo, be it grass, trees or wildlife. The growth had stopped when he had reached to just over seven meters in height, and at that point his cock was five meters long and 130 centimeters wide. He lifted his hands off the ground, rose up slightly and put both his hands over his shaft to start massage it. He ran his hands forcefully against his gigantic tool as it continued spewing some more seed in front of him. The relief was amazing, and once his orgasm had finally weakened, the kangaroo allowed himself to calm down. He huffed loudly before letting himself fall on top of his giant cock and fell asleep right away.

What impressive strength! But we need brains and not brawn. It's also the second specimen that is fleeing from us. They are supposed to understand us, why must they run away? I certainly hope that they will be easy to find and understanding when we explain to them that we mean no harm. I most definitely hope that they won't hold too much of a grudge against us for using them as experiments. In any case, the only animal that hasn't fully become anthropomorphic yet is the orca, though he definitely looks like he's transitioning to that point.

But it wasn't enough yet. The orca wanted more, and so he resumed working on his dick with both his beefy arms and with his tongue. It took him very little work to reach an earth-shattering orgasm. Each blast of cum out of his cock was absolutely massive, and brought him the strongest of the pulses ever, making every single one of his muscle swell with power, and making his shaft expand a bit. His eight-pack became a ten-pack quickly, he went from very muscular to absolutely gigantic in the span of three shots of cum, his shaft was rising above the five meter mark and his output of seed was ever increasing. The tank was very quickly becoming whiter and whiter due to how much cum his cock was blasting. Eventually, the shots became powerful enough to splatter all the way up to the ceiling after blasting through the surface of the water. He had become extremely muscular, reached ten meters tall with an eight meter long and three meter wide cock when finally his orgasm weakened. He swam to the edge of his enclosure, the one where there was a thick reinforced glass separating him from the ocean. He balled his hands into a fist and threw it powerfully against the glass, shattering it and thus, freeing himself from that place. While he was grateful to the humans for whatever they had done to him, he wanted to get back to the wild.

There goes the orca. That is truly unfortunate; while I am definitely confident that we can eventually track the bat and the kangaroo, scanning the oceans will be almost impossible. That is of little relevance to that experiment. However, while I was observing the killer whale, I got a call from the salamander who had borrowed a phone. I was able to talk to him, and I am still dumbfounded that it already knew that much of our language! It's a breakthrough, just as I had expected! We need to learn about its - I should really say his instead of its - reasons, to hopefully deepen the bond between us humans and animals. In any case, he said he wanted to collaborate with us, I do not know why, but I look forward to that.

All four of the ex-experiments were finally free to do whatever they wanted instead of living in a laboratory. They were gods on this world. The bat had found a giant dark cave where he met many of his brethren. The salamander stayed with the scientists and tried making plans on how to perfect the serum with them. The kangaroo rallied many other marsupials to make one big family. The orca swam through the oceans and made his mission to rescue other imprisoned sea creatures from the hands of humans. There was a good reason why the salamander befriended the scientists, it was to improve the serum and hopefully share it with other animals to create more gods like himself.