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Jacob was used to being walked on, but he was an optimistic sort of person so he always found a way to bounce back. His friend Esther enjoyed his optimism and often helped him whenever she could. They were not prepared for both of them being overcome with misfortune at the same time. Their city sat literally over top of a river with its streets arching over the waters repeatedly. It was a very nice location and had a booming fishing and tourist industry, but a harsh series of earthquakes quickly changed that. A volcano erupting so far away they could barely see the smoke, caused tremors down the fault-line which unfortunately put the entire city into the river. The city itself was starting to salvage what it could and rebuild, but Jacob and Esther unfortunately did not have the financial support to bounce back from that. Once the streets were rebuilt they would be living on them if they did not figure something out. Forever an optimist, Jacob found some helpful people from a neighbouring city that were looking to help the cause. His optimism convinced Esther to chip in as well and they pooled their resources and information into that effort...which unfortunately turned out to be a scam from people trying to prey on the weak.

Now with really nothing at all they were doomed, but this time Esther found something. Even shadier than the last offer unfortunately they had so few options that it still seemed the only choice. A shadowy organization calling itself RHE. It was looking for human subjects for testing. It offered accommodations that made it really seem like a too-good-to-be-true situation, but also repeatedly stressed it was PERMINANT. They did not want part timers, if you signed up you were with them forever. Feeling at fault for their last hit, Jacob went along with Esther on this without question. They were met by surprisingly professional, nice people who offered them paperwork and lengthy explanations that remained so vague it might as well have been a fortune cookie.

The businesswoman flanked by two agents who refused to sit down like the rest was the one doing most of the talking. "So, like advertised we will offer you a place to stay and food to eat for the remainder of your contract which is...forever. It is a nice place but I must insist to stress the point- you can't leave. It is a great deal, but also if you have hesitations on committing to this fully, DON'T."

Esther blushed, glancing up from the papers. "I actually already signed before you finished explaining...so..."

Once they signed themselves over, the woman and her agents took them on a long flight on a plane with blacked out windows. Since they had already signed, the woman started to tell them the details they could not know before. The reason they were so secretive and the reason the subjects could never leave was simple- everything they did was very illegal and they couldn't afford having anyone snitch. If someone attempted to escape, RHE would literally have to kill them. RHE stood for The Rewriting Humanity Effort, and they worked on altering the human genes to try and make the world a better place. Any alterations to actual humans however was very illegal regardless of the how and why, so they had to work in secrecy. They managed to work outside of the governments by having several wings in several different countries, and no ONE wing did anything illegal. The actual practices and use of what the wings produced were done on a remote island they owned and controlled themselves, which was where Jacob and Esther were being taken. They would specifically be a part of food transformation. Eons ago in a now long gone kingdom of Ebode Deqrown there had been a brilliant alchemist named Dr.Hemlock who developed gene isolation well ahead of her time. She created a violently malformed human that could be fed almost literal trash and have their bodies break it down into something others could consume. RHE planned to try to take the foundation she build eons ago and make a future friendly version. Humans have the ability to create milk- a particular brand of milk tailored only to other humans. This allowed the young, the elderly, and the otherwise enfeebled to consume it where their weak constitution may not allow them to consume other foods. Yes technically one could simply create a human dairy farm with zero alterations to genetics, but again governments and volunteers may pose a problem. There was such a thing as a wet nurse- women who perpetuate lactation to donate, but these were relatively rare. So if you can't have enough women doing it what do you do? You make a couple of women with the mammary fortitude of hundreds. Jacob blushed, looking a bit nervous as he asked his role, since he was male. He thought they might be planning to alter his gender but that was not the case. She simply told him that to keep up lactation outside of pregnancy you had to trick the body into thinking it was pregnant, or in the immediate possession of a needing child. Jacob's fortunate role was to bang Esther so her body thought it was always pregnant. That did not mean he went without alterations however- they needed to make sure he was very good at banging her.

Their first day on the island was spent just getting to know the place. They home they were staying in was very nice as promised- it had everything they could need, and the kitchen had an obscene five refrigerators lined up and fully stocked, as if needing to feed an army. Television, computer and an internet connection even- though the connection was monitored by an AI that terminated any attempts at disclosing information to the outside. Any outgoing text was automatically curated to prevent information leaks. There was many people around their designated section of the island, from a circular array of other such homes. At least half were test subjects in waiting, the other half was the islands actual workers. Almost all of them women, since the majority of their volunteers were women desperate to escape countries steeped in sexism against females. On the second day the two enjoyed their new paradise home, and were only disturbed briefly to get injections. Though the two were never actual dating ever, they had sex with each other a few times here and there, helping each other between their own independent relationships. They both blushed and were a bit nervous when the researchers continued to promote sex between them, but neither were actually against it. Being told to do it was what made it awkward. Before going to sleep, Esther noticed her areola were darker than usual. Jacob found himself feeling horny out of the blue, but by then she was already in bed so he decided to keep it to himself and shrug it off for the time being.

He went to sleep with a persistent boner, and he woke up with a raging one. His glans were purpled and the veins of the shaft standing out aggressively. He had to bow forward to take a piss because it wasn't going away. Esther was eating a rather large breakfast when he wandered into the kitchen with an unusual stance and she immediately noticed something off. Jacob was quick to explain and suggest they have some fun, if she was up for it. With a shrug, she agreed and they scooted back to his room for a romp. He was expecting to go off right away from how sensitive his dick was, but he actually seemed to have a lot more stamina than normal, and they went at it for some time. Esther asked him to be careful with her breasts though when he grabbed them- they were unusually sensitive. Jacob was a rather plain looking guy, with short brown hair and pale grey-brown eyes, a bit scrawny looking. Esther was quite attractive, though her breasts were only handfuls and she often felt self conscious around larger women. Her hair was also brown and her eyes blue, though today like her areola her hair seemed darker than normal...perhaps it was only the light. They ended up having sex a second time that day just before going to sleep, while they watched a movie. What turned into flirty joking turned to sex on the couch and they both ended up just falling asleep there on top of each other.

The third day Esther was ravenously hungry, and her breasts were noticeably puffier, and her nipples standing in full aggressive attention. They also felt unusually firm, which she wasn't sure if she should be worried about or not. Jacob had a few changes as well, though specifically his genitals. His balls were much bigger and the hair seemed to have fallen out of his scrotum and started to thin around the base of his penis. The dick itself was longer too, by at least half an inch, and that alone put it at full attention. The two were rather pleased with the changes so far, and celebrated with sex on the floor right there between kitchen and living room- which was not divided by a wall. Esther was a bit more confident in her figure now, and ventured out later farther from their home to mingle a bit with the other women on the island. Her breasts continued to feel a bit uncomfortably tight though, and her nipples never seemed to stand down which was a little embarrassing. Just after dinner, a researcher visited to check on them and give them both another shot after seeing the first had settled in. Now that the changes were confirmed, this second dose would enhance and speed them up. It would be foolish to give them the full dose immediately, because if something went wrong it would already be too late to fix it. They can make alterations and fixes, but there was no 'undo button' if something went awry. It was only two hours after the second shot and the researcher left that they were horny and going at it yet again. This time the tightness in her breasts increased to the point where her very firm boobs started to turn pink from internal pressure, before all the jostling around during sex finally caused ivory beads to fling from her standing nipples. The tightness was milk building up inside her. She never lactated before so her body was new to its release as well. The more she lactated the more she would adjust to it- and obviously the alterations to her genetics would only amplify this. Unusually, her hair was turning colour as well, it absolutely was darker now if only a bit, except for one strip that remained the same as before. Again, Jacub's stamina was through the roof and although it felt like he was hitting peak many times, he did not, and they went at it for almost two hours before he finally exploded. Esther was puzzled at first- through the explosion of pleasure she noticed he entered her even deeper when he finished, slowly putting more in her and filling her till she burst too. She thought he was holding back for some reason, but when he pulled out they both seen why it seemed like that. He had grown- very quickly as he finally reached orgasm and stopped as it tapered off. He was a full inch larger, making him about two inches longer than when he first arrived on the island now!

The next day Jacob woke hearing Esther going at the food again like she was starving in the kitchen, but remained in his bedroom puzzling over his reflection for some time. He had no pubes now, and there was veins projecting from the base of his dick onto his body a bit. His balls were still larger and heavier, forcing the skin of his scrotum smooth and there was a buildup of dense skin at the base of his dick that was clearly much thicker than the rest for some reason. What he was trying to figure out was the rest of him- he seemed...harder? Not quite muscular but definitely more fit. He smirked at the thought that all that great sex was technically a good workout. Esther paused her eating when he entered the kitchen only wearing underpants. She knew she was eating like an animal but hoped to get it all in before anyone seen her. She wore an oversized shirt that she slept in, but Jacob pointed out she was leaking and had not even noticed. There was wet streaks down the front leading from her nipples jabbing into the fabric, and drops of white on the counter! Her breasts were not rock hard like before, though they were very heavy- she did not think she was at capacity yet. They were noticeably bigger too, not a lot but definitely a cup size. Because of that, her bras did not fit anymore, which made her nipples that much more noticeable when she went out. While she was out wandering the island and enjoying the weather, Jacob went into the fitness room he never thought he would ever use and tried out some of the weights. He just felt like he needed a stretch or a workout or something, like his muscles needed flexing. He ended up losing track of time and being in there for hours working up a sweat. Esther calling his name snapped him out of it, and he marvelled at his reflection on the mirrored wall in the room, he was visibly larger. He actually looked a bit muscular now! In one day! What Esther noticed right away though was his underpants being held inches off his body by his hard cock. They looked at each other several moments without saying anything and then immediately scrambled into the bedroom to fuck. They did it doggy style this time because Esther wanted to feel her bigger breasts swinging. Jacob reached around to grab her nipples and milked her onto the bed as he fucked her. It felt so oddly natural to her to let him milk her like that. She felt a mild pleasure inside her breasts and waves of warmth inside, like her body was speeding up production to try to keep up with the rate he was milking her- even though that was beyond the ability of any animal to produce. Jacob also noted her nipples were bigger and fatter now, and seemed to be lightening again. As she was milked it also became apparent her breasts were not just larger from milk, they actually had grown another size during the afternoon. As they fucked Esther could feel the weight of his balls as they slapped her from behind as they grew more. The veins on his cock were bigger and his dick stretched even longer as he climaxed in her again.

Esther forgot what they did in their haze of lust the night before and was confused when she woke up in a puddle of milk on the bed. She actually had a hard time sitting up, her breasts had grown while they slept and were also full of milk- she was not at all accustomed to the weight and size. Her areola were actually lighter than they were when they started which was odd- generally they darken when lactating, so why did it reverse? She glanced at Jacob who was still sleeping and gasped- he looked more muscular again and even a bit taller somehow! The flesh at the base of his dick was longer and thicker still and much darker than the rest of his skin, even his balls were a shade darker. The thick folds of skin at the base almost swallowed his sleeping dick. Her eyes narrowed at the fact his ears were also a bit bigger and a bit pointed, and then reached up to realize so were hers. Her stomach growled angrily as her body demanded more fuel to create milk from and she once again got up long before Jacob to stuff her face. It was a bit creepy- they must restock at night because neither of them ever seen the food delivery people, yet the kitchen was completely restocked every single day. She could eat literally all of it and it would all be back again the day after. Esther could feel the warmth in her breasts as she ate. Her body worked so quickly she could actually feel the milk being made. Her breasts got heavier and heavier, her nipples fattened and started to leak but she ate so ravenously she always made a mess anyway, so she didn't care. Her tits were huge now, easily competing with any porn star, and thanks to always being fully stocked on milk, they were always firm and round. She took an eating break to milk herself into the sink, being surprised at the force it came out of her big fat nipples. She took a step back, then another and another and still got the milk in the sink from where she was! It seemed like a bit of a waste, but the RHE could not use it till her changes were complete at risk of the milk carrying some of the mutagen, and she was already more than well fed. It was outstanding how much she managed to eat yet gained absolutely no weight, because her body converted everything to milk. She fumbled some of her food today because her hands and feet were feeling a bit stiff for some reason, but other than that, things were great.

Later that day the researcher returned with the final dose for them, seeing as all the changes were within acceptable parameters. The researcher found their tailbones were lengthening a bit, and some of the bones in their hands and feet were fusing together, it had not reached their digits yet, so neither of them noticed themselves. Esther was out at the time the researcher arrived, so he gave Jacob his shot and just waited for Esther to come back. Jacob had been working out again and paused when he got the shot, feeling a bit off. He went to do some lower weights for a bit and about ten minutes after his muscles started to flex on their own, pulsing and swelling. Veins bulged on the surface of his muscles to increase blood flow as he grew stronger and even taller by quite a bit. Had he been wearing anything other than just pants he would have outgrown his clothing right then! He did not notice a line of bristly thick hair growing in down his neck as it lengthened and thickened with the rest of him. His iris darkened a bit and his pupils started to stretch horizontally slightly. He panted and sweat hard at the feelings and the bulge in his pants grew larger. He grabbed an entire rack of weights and lifted it with all the weights still in it!

Once Esther was home she got her shot immediately so the researcher could get out of their space, and Jacob immediately magnetized to her practically demanding sex. He was so hormone crazed he could barely form proper sentences! This time she rode him so he could view her wobbling tits as she bounced on his cock- and also because she was a bit nervous about his new size and strength maybe being too much for her. He could still feel his muscles squirming, and his joints were stiff like they were not sitting right. Like they had grown as well and needed to shift. His balls were absolutely giant, bigger than ostrich eggs now and seemed to grow slowly still as they shifted around in the scrotum. The flesh buildup at the base of his cock now went almost to his navel and fused with his gut, becoming a sheath for his cock! The skin was thick and plush looking, Esther kinda wanted to play with it once his dick settled back down. Going by the size of his shaft now she could probably easily fit her fist in his sheath. In addition to the bulging veins, a puffy ring appeared halfway up his cock, and the discoloration of the skin around his groin seemed to abruptly stop at that ring, and was normal pink beyond that. He seemed to be growing fine but dense fur like hair on his forearms and legs as well now, and it was becoming more obvious as they had sex. His nostrils also flared quite large now, and his ears were leaf shaped! Esther leaned farther forward as she went, relying more on rocking her hips as her breasts started to react to the last shot and visibly started to grow again. Her areola became hot pink, and her entire breasts started to look every so slightly pink as well. Her hair darkened to near black, except that one stripe in the front that did the opposite, and lightened to near white! Her ears also became leaf shaped, but almost twice the size of Jacobs. Pleasure pulsed in her breasts at the sensation of the oceans of milk inside rocking back and forth, and the feeling of droplets passing through her nipples as they started to grow even longer, becoming fat thumb sized. When Jacob finally climaxed into her, the head of his cock swelled gigantically and flattened out a bit in the process as his overall dick grew yet again in length, nearly the length of Esther's entire arm now and she somehow still took it just fine. The feeling of the giant head scraping the inner walls of her pussy easily set her off and as the muscles in Esther's body spasmed in joy, her breasts joined in and she had boob-orgasms, blasting milk in every direction. While her bigger nipples were better at directing milk flow forward, they did still spray in multiple directions at once.

She was feeling hungry again as her transformation was going into overdrive now and wandered into the kitchen after they were done. Jacob's erection waned only for a few minutes and then returned full force and some of his bones started to groan and then pop as his body shifted more. His tailbone extending, and his neck getting unusually long and his pupils fully stretching horizontal as his nose started to grow larger and broader, pulling his entire face out a bit. Jacob found her in the kitchen, her legs longer than before and her feet deforming. Her toes were being pressed tighter together and fusing more the longer her legs got and her nails thickened and fused, pushing out more as she developed cloven hooves! Her added height put her at level with the counter to grind her large plump pussy into it as her hormones were going into overdrive from the changes as well. She loved that feeling of orgasming from her breasts and wanted it again! Jacob's cock was so huge the head wobbled in front of his own as he walked awkwardly, not even aware that his own legs were becoming hooved. She immediately slapped her milk-wet breasts onto the counter and bent over, lifting her small narrow proto-tail for him to enter right there in the kitchen. Still panting and grunting from his own changes he took the invitation without any actual words and entered her full force. Esther went side-eyed at the pleasure of the counter tugging on her tit flesh as he pounded her back and forth on it, and the growing sensation as they expanded even more! They looked like those huge beach balls and they were still growing! Normally this would mean she would be immobile, because there was no way a human could possibly lift those, but she wasn't fully human. Her spine thickened and her hips popped as the bone became much more dense and wider, allowing more of Jacob's cock into her, which was good because it still grew a bit more! All she could manage was grunts and moans of pleasure, and her voice deepened as her own nostrils became large and her nose and face started to grow out! Jacob's nuts were the size of medicine balls now when they finally stopped growing, and the heat of his cock flattened out almost entirely as the urethral opening projected a bit from it. His hooves were not cloven like hers, and very large and dense in comparison. His hands started to emit muffled cracks as they also started to fuse into hooves to match his legs. His entire body darkened with a slight pelt of fur that matched his hair colour. His neck lengthened well beyond a humans and his face continued to push out more and more unlike Esther's whose only pushed out a bit. His tailbone extended, but was almost entirely cloaked in long hair, reaching the back of his knees in length! Esther's hands started to transform into cloven hooves and her nose and lips turned a hot pink like her huge nipples. She grunted and scrunched up her cute face as two blunt, stubby horns popped out of the skin on her forehead! Her tail grew hair as well but only on the very end to form a tassel. She had to stand up straighter and straighter because of her gigantic breasts. When they climaxed again, her breasts climaxing was so powerful that the entire living room across from them was covered in a white mist of milk from the blast!

A researcher woke them up almost an entire day later- they passed out from exhaustion from all the sex and changes to their bodies, but they were complete now. Jacub stood nine feet tall and was muscular enough to pop a man's head off by flexing his biceps. He had to take relatively shallow steps for the size of his stride though, because his testicles were gigantic and would not both fit between his legs forcing him to be careful how he stepped. His arms, legs and head were completely those of a horses, as well as his mammoth cock- though his balls were giant even for a horse. He could still speak human words, but his voice was deep and a bit hard to understand. Esther's breasts were beyond comparison to most objects one would normally come across. Perhaps two and a half beanbag chairs stacked together? They certainly weighed more than a beanbag chair. More in the ballpark of a small vehicle. When completely filled with milk they might rival ship anchors. Her spine and legs were modified with bovines, allowing her to actually lift them as long as they were less than half capacity still. Even then, the tremendous imbalance meant she had to shuffle them one swing at a time, because her centre of gravity only allowed her to heave them up for a moment at a time. Luckily Jacob now possessed the super human strength of a man and stallion together to helf her massive boobs for her to help her around. Her face was only halfway that of a cows, giving her the cute broad nose and lips of a cow with a big tongue. Like Jacob she could still speak human, but her voice was deeper and a bit hard to understand- when she moaned it was absolutely a cows lowing. Her ears, arms, legs, and tail were all completely cows, and covered lightly with black and white splotches of a cow. Her torso was untouched by the fur or coloration, though her breasts were a bit pinker than normal. If you pressed in around the base of her breasts you could see and feel the giant milk veins just below the surface from her mutated mammary glands, well insulated in wobbling fat. Now it made sense why virtually everything in the house was voice controlled and there was no remote for the tv- they did not have human hands to operate them. Esther could also not milk herself, but her tits were so huge she couldn't possibly reach her teats anyway, so RHE installed milking units into the house, already waiting on the island for when their changes finished. Jacob was specialized at having sex, multiple times in a row if needed, for long lengths of time. Esther was super specialized in creating milk in absurd amounts in virtually no time at all, if given the food to make it with. True to their promise RHE took good care of their test subjects and the two of them worked perfectly together to create milk perfect for human consumption. RHE then was able to sell the specialized food to those who needed it at no more than the cost of what it took to feed Esther and to ship the fluid where it needed to go. And no one in the outside world needed to know where it came from or how. All Esther and Jacob needed to do to help, was enjoy their new life on a paradise island. They were perfect mates!