Calcium Proficiency

Story by iplank on SoFurry

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Three sisters inherit their father's massive ranch, but its profitability and number of livestock dwindled with his health. The three women are faced with the problem of getting the ranch up and running at full speed again as soon as possible for them to be able to justify the time away from their other professions. Between the magic and alchemical know-how of two of the sisters they have a plan, but it involves them all pitching in, in a way they had not originally thought of.


(F x3 TF, varius human/cow mixes)

Farlane ranch was was falling on hard times, since the old owner passed. Too old to keep up with it all before he went, the number of livestock dwindled, and when the last bull went on from old age before the rancher himself, he was not replaced. Now the remains of the ranch fell to his three daughters. They all had a hand at ranch work when they were younger, but had gone off to do grander things- Mae was a Magister and Maggy was an Alchemist ... Mary was a chef, but that isn't so important. The point is, they all wanted the ranch for different reasons and the property was large enough for them to build the structures to each set up a place on this little slice of heaven- but none of them could do it if the ranch itself tanked. They immediately purchased a new bull to service the remaining cows, but new calfs needed time to be born and grow, new cows were not going to just magically start appearing. Right now paying the driver of the milk truck to ship their product out would almost offset the actual profit entirely. They basically had enough to make sure all three of them had strong bones and full fridge and that was it. But Mae had an idea to give them a profit spike to give them funds to keep things rolling till they had enough cows. There was something the three of them had in common with the cows- they were female, and they were mammals. That meant they could also create milk.

Mae toiled in the main house for days with the help of Maggy while Mary cooked them all delicious meals. They had been apart for some time now but even over the course of only a few days the sisters could tell living together on the ranch again would be great. Maggy created several potions distilling the bovine essence, and Mae used the inert essences to create transformative potions with her magic. With these potions they would be able to transform themselves to be more cow like and create their own milk! The only problem was that since this was all theoretical work on their part, they had no idea how long it would take to wear off... so they were all stuck on the ranch for the duration of the effect, but that was fine.

Mary held up one of the strange potions and peered into the contents as it sort of looked like two different kinds of food coloring mixing, then one, then two again. "Should it be... changing colors?"

Maggy laughed. "Oh gosh no, that is a terrible sign."

"Then why are we drinking it?!"

Mae shook her head. "Because most of the effects are through the magic, the potion has become topical."

"That... doesn't really answer my question at all."

Maggy shrugged as she lead them into the large but mostly empty barn. "It will work, we just don't know how well or in what way. Alchemical research has never created an actual transformation potion, like Mae said it is mostly the spell, the potion I made was inert, it was basically just the essence of the cows that told the spell what we wanted from it."

Mae nodded. "And that is all fine and well but there is a lot to a cow, but only really one feature we need- the milk production. But the spell was getting information on the full cow DNA. That is why the color is shifting- all of the potions we created will do what we need, but what ELSE it happens to do is somewhat chaotic- the milk is the only consistent factor between all of them. So we will be a little cowish... no big deal... right? No one will see us." For once even Mae started to sound a little uncertain, like she was trying to convince herself toward the end rather than Mary.

To help ease them all, Mary nodded. "Right, cows are kinda cute. And they get to laze around in the sun all day. And, the effects will wear off... r-right?"

Maggy nodded, patting the case she held. "That is why we made so many. We don't know how long these last, and we need to up production quite a bit, so we may end up having to take several before we get into the clear." She glanced down at her modest bust and blushed as they all slipped into the shade of the interior barn. "This will be weird... milking ourselves together. But, we are sisters right, we stick together." The three of them nodded together.

They moved the hay bales around and old empty crates to create seating for themselves and created almost a sort of giant nest for them, moving the unused milking equipment there as well. They hand-milked cows too, but when population got bigger more got moved to machine milking, while only the best behaved, beloved cows continued to be hand milked. Now with three owners and few cows, all of the current cows were being hand milked. All blushing and nervous, they started to strip in front of each other, occasionally making a joke about how naughty it seemed, stripping together in a barn. It was a huge plot of land and no one else should be coming by, so no one was going to see them. They could run naked through the fields all day and never be spotted.

Perhaps because she is such a good chef, Mary was a bit more portly than her sisters. Not really fat just a bit... soft. Also as a result of this, her breasts were a bit larger and a bit droopier, they were E cups already without help. Whatever genetic gamble Mae had won resulted in her turning out a bit taller than her siblings, but sported only Ds, making her the least busty. She looked a lot more lanky, because she was both taller and more lean, which is likely why her busts growth was stifled. Maggy was a middle ground of the two, the same height as Mary but with average figure and DD breasts. Mae had an incredibly long tightly braided ponytail, Maggy's was just short of shoulder length but had very long bangs, and Mary's was untamed to the small of her back. All three had the same loosely wavy sandy brown hair, and dark green eyes.

Always finding a way to over-complicate things, Maggy rolled a dry erase board and started to do some rough drawings on the board showing a spectrum of theoretical forms. A woman with cow ears and tail and giant breasts, a similar woman with four breasts, one with an udder, and then finally an actual cow. She explained that fetish idols have been made of all the above throughout history as symbols of fertility. The potion would go to work on them to give them what it thinks they want, but because it is topical it will be most prominent where it is first applied. Which means if they apply it to their crotch they will most likely grow an udder. If they apply it to their breasts, they MIGHT still grow an udder, but will most likely just get much bigger, super productive breasts. With the instructions out of the way they nervously glanced between one another trying to see who would go first. Calling them both babies even though she was just as nervous, Maggy got up and took a potion, dumping it over her breasts before sitting back down. Even nude they were all plenty warm, it was the peak of summer and the sun outside was blazing, but now her breasts started to radiate their own heat. She rubbed the potion on them and made sure to coat it to the bottoms as well and in the valley between. Her nipples became erect from the touching and her skin firmed up a bit as well. She flinched as she felt a drip threatening to roll down her torso! She quickly wiped the excess off but then did not know what to do with it and just wiped it off on the sides of her legs. It actually took her a fell second to internally scold herself and wipe it off her legs the best she could and onto the hay. Now that she thought of it, it probably would have been best to wear gloves when doing this. She was right about that.

Maggy took a deep breath as she felt her breasts start to firm up on their own, almost looking like they were trying to stand up on her chest, looking more spherical like fake breasts do. Her nipples tingled as well as they veeerry slowly started to grow as well. All three sisters watched, with faces flushed red. The breasts grew larger and rounder, then the skin started to catch up and their shape started to relax a bit causing them to rest into the more proper tear-shape. She giggled nervously and shook her chest gently, feeling the heavy fat spheres sway back and forth. It felt good. The growth felt good and even the movement felt good. Even cows like having their udders touched- massaging the udder before milking can increase production because it relaxes the cow. As Maggy's breasts grew though, they started to look a bit pink. At first she assumed it was blushing from the sensation and rubbing she gave them, but noticed her nipples and areola were also starting to lighten. Her areola started to rise out and get puffy, but the color altered slowly to match the same candy pink as the rest of her boobs were taking, causing them to blend in perfectly. As she shook her boobs around, she could feel her nipples lagging behind. They bent from the movement as well, having become large enough to do so. She could barely see the very ends of them over the curve of her own impressive tits. She wanted to get a better look so she hoisted her breasts up but then dropped them again as she flinched from an odd sensation in her wrists. Her breasts slammed into her torso heavily from being dropped so abruptly and yanked her forward a bit. They were so large that bending even a little forward caused the lower curve to brush her thighs.

Maggy brought her hands up to see what the strange feeling was and went wide-eyed as she seen her hands compacting! The bones inside were starting to fuse together from the wrist up! Her nails started to thicken greatly and turn black as her fingers were forcefully squeezed together and became one as if her flesh was made of modeling clay. She should have worn gloves! Or been aware enough to wipe it off better- the potion soaked into her hands and was turning them into cloven cow hooves! Her thumb and pinky receded a bit and the nails overtook most of their mass, turning them into dew claws. The rest fused into one giant hoof on the end before a surge of inner growth yanked it in half again, giving her the two segments of a cloven hoof. Maggy was planning to use the dry erase board to pass the time while being milked... that will be rather hard without hands. Her ears started to tingle and heat up from embarrassment of making such a mistake in front of her sisters, but realised that it was also because they were starting to turn into huge leaf-shaped cow ears. Tangent transformation- the ears and tail were consistent across most theorized forms, they likely would have turned no matter what so those did not concern her. What did concern her was a pressure on the underside of her breasts all of a sudden. Were they mutating in another way? She reached under her giant tits but had to sort of feel around using her wrists and fore arm, since her hands were solid hooves now. Her eyes went wide as she realized an unexpected mistake! Clearly a full potion was too much, because the remaining excess that had been clinging to the underside of her boobs slapped against her torso when she let them drop, creating two circles of remnant potion which were now quickly turning into two more breasts! At first it was just fat deposits and nothing more, forming two broad bubbles of flesh, but then as they grew they started to tingle and send jolts of pleasure into her, causing Maggy to flinch and jiggle against them. The nerves were forming for breasts, and the mammary glands were forming inside to create milk. Digging into the fat from within the nerves and milk ducts spread like roots outward till the concentrated forward growth caused a bump to appear on the end of both mounds- the start of nipples. These were going to match her top breasts though, so the nipples never darkened, and also oddly did not form areola at all, they remained pink like the flesh that bore them. By now her top breasts had stopped growing, with fat teat-like nipples that looked the size of pinky fingers. When she shook her breasts she could feel the teats flop around on their own, drooping just a little from their own weight.

Maggy tried to lift her breasts so her second set would not jam themselves into the undersides fighting for space on her torso, but they were so large that lifting them smushed them into her face. Maggy then tried to lean back while holding them up but the tingle of change shot up her legs surprising her, causing her to fall completely over onto her back. Her giant breasts rolled right over her face a moment before wobbling back into place on her chest. On her back, the breasts flattened a little bit, causing them to spread out over her arms partially, and the weight felt like a sack of potatoes sitting on her. The potion she wiped onto her legs earlier was now having the same effect as on her hands! Her feet were stretching out, causing her overall leg structure to become much longer. Cows do not have long legs, but the transformation was not affecting her from the knee up, which would be much shorter on a cow. At least her second set of boobs had room to grow like this and bulged in size, the nipples fattening up into teats as they wobbled entirely on their own from the movement of the growth itself. Maggy clenched her toes from the sensations but soon enough they were clenched because they had fused together into a single mass. The other two sisters winced at the muffled popping sounds coming from her feet, thinking it hurt, but it was almost the opposite. She lay still breathing heavily even after it stopped, not sure if it had really ended or not. Her heavy breaths caused her breasts to wobble around and gently slap into one another. Her lower breasts were not as big as the top ones, though the teats were the same size. She started to wobble more violently, looking like she was convulsing for a moment before the other two realized she was trying to sit up but was pinned by the weight of her tits! Either sister took an arm and heaved her up into a sitting position, having to try twice after realizing she needed to spread her legs. There was not enough room for her to sit normally without jamming her head between her top breasts. She had to spread her legs wide so the bottom two could flop down between them to give the top pair space to sit on them.

She squirmed a bit feeling her breasts all rub one another, glancing at her entire body. "Well, could be worse I suppose. Not having hands will suck though. Weird." She looked her hoof over. "My arms are not changed at all, still fully human, just my hands changed, so it is sort of like having them in some sort of bondage. Also weird I did not get a tail... all my theorized forms had a tail."

Mary chuckled. "You sound disappointed."

"Well... I mean we have to transform anyway, kinda... wanted... to know what a tail was like."

Mae went to grab a potion vial. "Well, one full vial seems too much volume, so I can just smudge a bit of mine on your tailbone if you really want."

Mary tilted her head a bit, glaring at Maggy's prodigious chest. "But, you will have milk still, accidents aside? This whole thing is for the milk after all."

With a hoof, Maggy pressed into her top boob near the mound that was her invisible areola and white beads immediately appeared on her teat. "Oh yes, I can feel it inside. The weight is... immense. I mean these boobs are very heavy on their own, with milk in them as well I don't think I can walk till I get milked. My back just wouldn't be able to lift these. Good thing I did this sitting down."

Mae struggled with the stopper on her potion vial, it seems this one was on especially tight. It finally came out with a loud pop, but she had to use so much force to twist it out that the vial went flying out of her hand as well, spinning in the air before landing in her lap and dumping its contents on her! Both other sisters groaned in sympathy as Mae quickly grabbed her clothing from beside her and used her shirt to sop up the spilled potion. It hit her upper crotch but she was quick to correct the error and get it before it touched much else for any length of time.

Maggy shook her head. "You caught it quick but uh, I am pretty sure it is too late to avoid an udder..."

Mae clicked her tongue. "At least I will have a lot of milk, I guess. Oooh, yea, I can feel it."

The area just over her pussy started to turn pink and puff up as if having an allergic reaction to something. Her changes felt like warm tingling surges, and started at her crotch but seemed to radiate out into the rest of her. She started to gently rock forward with each pulse from the feeling and the skin bloated out a bit with each. Four bumps became visible from the front of the growing hill- the dawn of four new teats. Her forehead felt cold for some reason, and none of the sisters noticed but two circles of skin started to lose color as the blood drained and the flesh went numb there. No one had noticed but when the vial spiraled in the air, many droplets had landed on her head. From the bottom up, the color drained from one half of her braid turning it snow white. From the top down the other half of her hair darkened to pitch black. Mae clutched the growing sphere on her, now the size of half a soccer ball. She gently kneaded it, urged onward by the throbbing pleasure, and as she gently tugged the base of the proto teats they were urged to grow out bigger and fatter. At this point the mass of the udder itself started to indent a bit, forming four hills fused together rather than one sphere- this was because of the mammary glands forming for each teat. The pulsing in her body started to concentrate, and veins could be seen throbbing in time with the pulses, trailing from the base of the growing udder.

Mae's face scrunched up from the feeling of her ears growing like Maggy's had. It felt like someone gently tugging them back, but the touch kept getting progressively farther away- farther than her ears were supposed to go. She also felt the subtle flinching of new muscle at the base and back of the ear that allowed her to pivot them around, directing them toward sounds to better hear at distances. She gave a surprised grunt as her entire skull seemed to pulse, and in one mighty surge two short spike-like horns burst from her head, just in front of either temple, pointing straight forward! There was no blood or feeling in the skin the horns broke through, but she still felt the uncomfortable squirming of expanding bone- luckily they grew in a single surge. It was only then that all three realised some of the potion must have touched her head, and the other two sisters pointed out her now changed hair, and her face was started to restructure!

"Oooooh... feels goood." Mae's voice had gotten incredibly low pitched halfway through her moan.

She clutched her udder yet again to kneed it as it continued to grow. The weight was a lot so she opened her legs to let it flop down. Her heavy teats flopped and slapped the surface of the udder from their weight, flicking drops of milk onto the floor! She already had a full tank and it wasn't even done growing yet! She could feel it with her hands too. The surface skin was smooth as silk and soft to boot, but there was a solid pressure inside from the milk. The veins on the surface pulsed bigger and thicker, especially at the base and trailing onto her stomach. Milk veins, huge milk veins.

"So goood. Very... nice. Hard to think, dizzy with... pleasure..." She spoke a bit slowly, and Maggy started to wonder if the potion landing on her head might also be affecting her brain.

She shifted her weight forward as her tail bone started to squirm its way out, growing quickly into a tasseled cow tail. Faded black splotches started to appear on her legs and hips, and matched the white and black splotches on her growing tail, and the twin colors of her hair. She did not grow fur, because she was quick to have wiped the potion off- it just mildly altered her skin color. A bit bigger than a medicine ball now, her udder finally stopped growing. Even when she did not touch it, the thumb sized teats dribbled milk from overproducing. Her lips were thickening and turning pink as well as her nose, and she covered her face for a moment from the sensation of it changing. Under her hands she could feel her nose get bigger and wider, and especially her nostrils getting much wider. It became a bit cool and damp as her entire face started to stretch out. The others heard nothing, but because it was happening in her own head Mae could hear the stretching muscle fibers in her face and the soft clicks of her extending jaw. Her teeth each grew a bit to continue to fill her full jaw, and her tongue grew huge! Breathing heavily like Maggy had been, she slowly removed her hands from her face so the others could assess the damages. She did not have a cow head, like she dreaded. It was not quite human either though. Her face had extended out into a sort of half snout, and given her the adorable vibrant pink lips and nose of a cow. She stuck her tongue out and curved it up and sure enough could reach her nose with it like a cow. Her tongue was so huge she could touch the BRIDGE of her nose with it.

She grinned as she picked up her shirt and stood up awkwardly. Because of how her udder grew from her body, it was uncomfortable to stand upright with it when it was full, and she had to walk a bit bow legged to give it room to hang. The flesh on the back of her udder trailed off so immediately close to her pussy it also felt like her vagina was being touched when the udder swung. She wobbled her way over to Maggy who smiled back and squirmed into a sideways sit, so Mae could wipe her shirt over Maggy's butt. Sure enough after a few moments, the tail bone started to stretch out. The shirt was used to mop up the potion, transferring some of the remains back so Maggy could get her tail.

Both sisters goofed up their usage of the potion which really made Mary nervous. Her sisters were a lot smarter than she was, so if they fucked it up, she certainly wasn't eager to jump in. Although she was now unknowingly smarter than Mae. It was not just her speech that slowed down- her thoughts were slow and simplified, making her temporarily dumber. Mae also undid her braided pony tail and let her extremely long dual colored hair cascade down over her body. From being braided up the waves in her hair were even more intense than her sisters. At that thought, Mary snapped her fingers. Her sisters!

"Maggy, can you apply my potion?"

"W-what? I don't even have hands!"

"Exactly, if I get it on my hands I might grow hooves. But you can't because you already have hooves, so if it gets on you it has no effect."

Maggy was going to argue she couldn't hold anything hardly, but wanted her sister to feel at ease so kept her mouth shut and went ahead with it anyway. She picked up a vial using the crook of the two hoof segments and then another hoof in front to make sure it did not fall forward. She had to use her teeth to remove the stopper, being careful to hold it steady so she did not spill any like Mae had. She went to carefully drip it onto Mary's chest but Mary stopped her and pointed to her own crotch.

"Really, an udder?"

"Y-yea. Well this whole thing is for milk to make money and get this place up and operational as quickly as possible right? I mean Mae has been dripping constantly without even trying to milk herself. And udder is the most efficient milk factory. We have been milking cows for so long we altered their evolution to have an extreme capacity. And... uh, yea."

Mary's pussy clenched a bit at the thoughts running in her head as her lips clenched to not tell Maggy the rest. She had been a bit grossed out at the idea of becoming animal like at first, but her sisters were going to do it, and they needed the funds so she went ahead anyway. After having seen her sisters transformations though she was very aroused, and especially looking at the huge bloated udder between Mae's legs- Mary wanted to try. She wanted to latch on to one of those engorged teats, but would settle for having her own to play with. Maggy dripped some on her but Mary kept asking for more. She wanted to be BIG. The bigger she grew the more milk she made and the quicker they would all be done, right? She pushed her thighs together half to collect the potion in and half to hide her moistening pussy. Maggy was not sure pooling the entire potion in one area would work quite how she expected, but since everything was theoretical she did it anyway. Experimenting was all about trying unknowns and learning from failures, right? The potion formed a triangle pool in Mary's lap as Maggy went back to her own seat to watch. The potion was slow to drain. That was why so much excess was made when Maggy used her own. It absorbs a bit very quickly, enough to create the transformation but then the rest is reluctant to be taken in. Mary was not letting it move from her lap so it had no choice but to over saturate just that one area. Her crotch was turning pink and starting to inflate long before it had all been absorbed. This caused the pool to shift forward a bit, absorbing it a little faster as her thighs started to eat more of it than expected.

Mary's sensations reflected the course of the potion, pulsing in her crotch and then radiating down her legs. Like Mae, the pulses went up into her torso as well but faded much faster. In her legs the pulse remained just as strong right into her toes, as the toenails turned thick and black. Like with Mae, her udder started to shape into four united hills of silky smooth pink flesh, but unlike Mae, it only took a couple of seconds to get to that point. She was transforming much faster. Her thighs started to bulk up and take on the black and white holstein colors like Mae. The pops and cracks of bone in her leg seemed louder and faster, making them sound more violent, but again did not hurt. The bones were not breaking after all as much as it sounded like they were. They were growing thick and dense, as well as changing proportion and position causing them to dislocate and relocate several times, which was the loud pops. Mary went to ease herself back and stretch her legs out to go with the flow of pleasure inside her, but caused a bit of pain, realizing she was already growing a tail! She had to shift a bit over onto her left side to not smoosh her tail as she leaned back on her seat. She could not help but moan as her udder ballooned out quite large in a few powerful surges, already putting it near the same size as Mae's.

Mary squished her hands into the top of it, pressing it down unable to hold herself back. Thin streams of white squirted from her fat new teats, and the backside of the udder smushed into her pussy causing it to drool its own juices. But unseen by anyone, her pussy lips fattened up and grew as well. Her vaginal passage becoming deeper, her anus puffing up a bit and turning vibrant pink as well. Between the sharp spikes of pleasure and the pulsing growth her udder fought against her hands smushing it down and gave an immense surge. Because she was pressing it down into herself it felt like it was growing inward as well. With a loud half moan, half groan of surprise she went wide-eyed quickly looking down at herself when the growth really did backfire back into her! Her udder became so big so fast it smooshed into her legs and pressed outward on them, inducing a new growth as her hips very loudly popped, and expanded an inch, then twice more in rapid fire, then once more! Her hips were getting huge! Her thighs were becoming thick as hell too, but also changing shape to not be as round, looking more bovine than human. The transforming of her hips was causing her to roll around in her seat so much she toppled right off onto her hands and knees. Mary was forced to shift weight to her new hooves instead of her knees as her leg structure continued to change, and a light coat of fur quickly started to grow in! She kept moaning uncontrollably, red faced and dizzy from the unrelenting pleasure. Her udder swung below her, still getting bigger. Her ears started to grow out into the huge leaf shaped cow ears both of her sisters shared. Her ass was huge now, and looking a bit boxy in shape- like a cow. It did not stop though. Her legs kept bulking up and getting a little bit longer, and her udder kept getting bigger and bigger! Her hips gave off a pop and expanded every few seconds as her gigantic ass got still larger. Her ass alone was almost as big as her entire torso! It was forced to point up into the air just because her legs were so much bigger than her arms. Her pussy was absolutely massive, with thick meaty pink lips. She was practically gasping for breath between helpless moans by the time it finally finished. Drops of sweat were patting the floor almost as fast as drops of milk from behind.

She glanced between her arms and legs at the gigantic swinging udder. That was unexpected. She used the entire potion in one area, which caused her entire lower half to become identical to a cow. Not just shape, but also size. Which meant the lower half of her body was several times larger than the upper half, almost making her torso look sort of cone-shaped from expanding so drastically at the hip. Mary tried to stand, and teetered quite a bit. Her spine did not want to let her, but she could still sort-of stand up. To stand up straight she had to bend her legs a bit and let her udder droop down between them, which hurt when it was full because it tugged aggressively on the top of it. Her hips were also locked in a quadruped state- cows cannot stand on their back legs at all. Even when trying to cover a mate, bovine were astonishingly awkward shifting any weight to their back. Imagine taking a deep bow, and then having to hold that pose while walking, because that was basically what Mary now has to do- her hips refused to go at an upward angle. She did not dare speak a word of it to her sisters, but her rear felt so very empty now that it was so big. Her pussy was huge, and HUNGRY. It needed something to SLAM into her, something big, huge!

They tried to hook Mary up to a milking machine but it seems she was expressing milk with such ease the machine could not possibly keep up. They ended up sealing off two of the four hose ends and hooking her up to two different machines so it was one machine per two teats, just to be able to keep up with her. At least the hooves and new leg structure made standing for long periods of time very easy now. The sensation of the milk flowing so steadily through her teats was divine, and the relief of pressure in her udder was just as exquisite. She did not even notice how much pressure was in her till it started to drain. The milking machines were pretty gentle, and sucked rhythmically, making it easy to lose yourself in the gentle pulsing pleasure. They only set up three machines, and setting up more with these altered states was awkward, so Maggy decided to hold her milk for now, let these two uddered dairy queens go at it first. Even though she had no hands or feet, Maggy was by far the most nimble of the three, but was so top heavy she lurched when she walked, but would be able to walk normally when she did finally get milked. While hooking up her sisters, her huge tits kept brushing them, and having to touch their massive engorged udders to attach the suction cups made them all blush, but no one spoke a word of complaint. They were all pretty horny, and they all knew it. Not calling any attention to it was their way of telling one another it was fine and to just go with it. With their huge lumbering forms it was impossible not to press their fat smooth skin into one another. Both sisters even took turns brushing Mary's butt and thighs with their hands, just out of curiosity of what her fur felt like. It was a bit softer than an actual cows fur, likely adopting a slight semblance of her human hair.

It took hours to empty them out, because they never seemed to stop. So even while they were draining their milk they were also slowly filling with it again. It was already dark out by the time Mary was done, finally empty for however little time. She felt a hundred pounds lighter, and may very well have been. She awkwardly stomped her way out toward the house to stuff her face and take a breather finally. Her muscles were all a bit weak from the unyielding onslaught of pleasure from the milking machines. It was not an intense pleasure at all, but it was non stop, and took its toll. Maggy's load was all up top, so to help her get comfortable while milking she had to set up a board for her to rest her head on and drap her arms over, to let her huge tits hang down while sitting in a very leaned over pose. She just listened to some audio books while milking, after she had set herself up. Mae was the one who can most easily set up the machines, but refused to stop her own milking to do it. It felt to good. And she had become a bit stubborn... a bovine trait. She did not listen to audio books or anything, she just wanted to... enjoy the milking. She was supposed to do this after all, being milked was her purpose. She did not grow bored because her brain had devolved to such a simple state, she completely spaced out in the pleasurable rhythm of the machine tugging her fat teats. Every so often she let out a breathy 'muh' or a moan that was eerily close to a cows lowing. Her voice was extremely deep for a human, though still feminine. She could match a cows voice perfectly if she wanted to. Neither sister noticed when Mary did not return to the barn for some time. She had already finished gorging on food, but part of her still felt hungry as hell.

Mary stomped over to the occupied pens and let their sole bull out to play. It was not used to being out when the sun set, so while it wandered out of the barn it did not go far, and stood around a bit confused as to what to do. Its herd was still penned up, so what use was the bull? The human also had an odd scent, it smelled like one of his herd, only a bit human. Mary talked to the bull, trying to stupidly flirt with it even though she knew it could not understand a damn thing she said, and likely did not care enough to even listen in the first place. As her clenching pussy relaxed a bit it let out a small burst of pee without her meaning to and she went rigid in surprise. She did not mean to do that! She continued to freeze up though as she noticed the bull immediately perk its head up and sniff the air. It smelled her pussy! Her vagina was fully bovine! The bull moved around her to get a closer smell. She could practically feel the ground tremble with each step he took. It was a Belgian Blue... a species of bovine with a rare genetic mutation known as Double Muscle. As one could assume from the name of the genetic trait- the bull looked like it was about to OD on steroids. Its muscles had muscles. Its neck was thicker than the trunk of an elder tree. Its nutsack was like a sling loaded with two honeydew melons. Mary's eyes locked on the tuft of fur that marked the opening of its long sheath though, but it was behind her before anything peeked out. She had no doubt that he would use as many of those muscles as possible when slamming his cattle prod into her. And she wanted it, so badly. A fricken battering ram into her, slam her internal organs out of the way and stretch her as far as she can possibly go, over and over again. She bent all the way over, touching the ground with her tiny human hands. Mount her already! Mount up and slam into her, blast her with its cum. Make Mary the bull's property! She wanted him to own her! She wanted to be part of its herd, her giant pussy needed it!

The bull licked her pussy several times, pushing his tongue in deep. She wanted him to skip the foreplay, though the feeling of his huge tongue made her entire body tremble with even more want. She felt the ground tremble as his front legs left the ground and immediately slammed down onto her. His weight would have crushed her into paste, but her entire lower half was bovine, allowing her to withstand his immense mass as he thrust forward and penetrated her with his full might. Most of the air in her lungs was smashed out every time he thrust in, forcing her to breath with the rhythem of his rutting. Her mind went blank from the pleasure, so she did not notice her forehead numbing as two lumps of bone started to rise up. Pops and cracks could be heard from her torso as it slowly started to get longer, and from her hips upward she started to bulk out, causing her stomach to become huge. Milk veins inched their way up her underside as her udder once again started to grow, and it also started to fill with milk at an alarming rate. Sexual acts were triggering the milk production to go into overdrive. With constant fucking and milking, the body can be tricked into thinking its always pregnant, and thus always create milk. She groaned between his winding thrusts as her arms ached a moment from the increasing weight, and then as if to fight it directly, the bones in them started to pop as well. The bone became thicker and denser, and then longer as her arms grew out, raising her torso higher and higher into the air. Finally her expanding body was becoming able to level itself as her limbs started to match. When her fingers started to merge, they tingled with slight numbness because of how heavily her weight had been on her palms only moments before. She slammed her evolving hooves into the ground as they formed, feeling better and sturdier each time. Like this was what they were supposed to look like all along. Had her humanity been wrong? Maybe she was always supposed to be a cow, in a human body. She suddenly felt a bit queezy at the thought of all the dinners she had prepared that contained beef. She could feed people delicious milk now though! Feed them till they burst! So much thick heavy milk they grow fat... fat like cows.

More cows. She could make more cows! Her womb had surely changed as well when her hips did- the bull could theoretically make her pregnant! She could have calfs to feed! She needed to make... more milk for them. More... milk... feed. Fuck, milk, fuck, milk... mooore. Her thoughts very rapidly started to slow and devolve as her neck thickened with a grunt from her. Her vision turned blue a moment as her head was filled with a rush of blood from her much larger veins. Her face started to change to look like Mae's and slowly press out farther, and her horns started to grow larger than Mae. Her udder was still growing, pushing on the insides of her legs and bloating out forward and back. It was squeezed in there so tightly that it no longer rocked with the bull's thrusts, though his big balls still spanked it from behind. Her hips popped again, becoming even wider than a normal cows! Her body continued to swell and grow upward, and her arms not too far behind, looking almost identical to a cow now. The fur started to spread up as well. Her boobs were eventually swallowed up by her chest as it expanded greatly with rapid fire cracking sounds from her ribs turning to bovine size one after another. Her stomach felt like it was swirling around in her, doing a few quick laps around her gut, but in actuality it was splitting into four. Her head throbbed with blood pressure as her heart doubled and then tripled in size. The pressure forced her head out even farther, getting bigger and longer than Mae. Her teeth became huge slabs. She shook her head as her human hair fell away. She couldn't think straight even now that she actually tried. The bull felt too good to ignore for even a second. His giant cock fit her perfectly, like a puzzle peice. Like it was meant to be in her at all times!

Mary was completely unrecognizable now as a human, she looked almost perfectly bovine. Except her hips expanded a few more inches, and her udder showed absolutely no signs of stopping. The giant teats were dribbling steadily now, and still it grew. With one final thrust the bull came in her, slamming so deep and hard into her that her front legs buckled, angling her ass up so his cock reached as far into her as it possibly could, and her vision exploded into stars. She let out a giant, low and long moo, then in surprise several short awkward moos, realizing she no longer had the ability to speak human words. Her brow furrowed a bit as she tried to remember a few human words that she could say, but could not think of any. The bull dismounted and Mary let out a satisfied blast of air from her huge nostrils, and as if on queue her udder started to give off surges of growth, causing its entire mass to wobble violently, and short bursts of milk to fire out. It was still getting bigger! It was touching the ground and her back legs were still perfectly straight! She mooed at the pressure before her hooves were yanked off the ground! Her entire back half started to wobble with the udder's mass because it had grown so gigantic that it was holding her up off the ground! One inch, then two, then with a great heave the udder seemed to relax a bit, squishing outward, almost to the point of wrapping around her legs and her teats absolutely exploded milk out in four different directions, laying flat out against the ground. It was like four garden hoses.

Maggy had no idea what was going on out there, but even if she still had human ears she could have heard the grunts, moans, and mooing just as easily and made some educated guesses. Mary absorbed everything into one area, so the transformation started there, but she also is the only one to absorb the entirety of a vial. Maggy also heard movement around the front of the barn when she let the bull out. They would need to keep one vial even after all this was over with, because Maggy imagined it may be painful giving birth to cattle after Mary turns back human, while still pregnant with bull seed.

Maggy reached the end of her current audiobook and looked up to see Mae dripping potion on her udder with the look of a crazed person in her eyes. "What on earth are you doing?!"

"I need moooore. I was almoooost empty! Mooore milk! Muh...mooo." She was already starting to pant breathlessly as the sensations throbbed through her, and her udder started to grow again.

"Eh. Whatever. Not like I can stop you anyway." She glanced at her hooves. "My hands are tied, so to speak." She was secretly only disgruntled that the other two did it first. At least one of them needed to be mostly human to keep this zoo under control.

Mae's slow mind finally thought 'what am I doing' as the drop of potion was already falling through the air and touched her left breast. The nipple immediately hardened and she could feel the gentle but insistant pressure building. Well, too late now, she had to balance it out at least. She let a drop fall to the other breast as well. Her udder started blasting milk into the machine again at full pressure as its growth continued, but started to slow again. She had only used a couple more drops on it. She dropped the stopper on the ground though, and could not reach it without unhooking from the machine. But... it felt too good. She did not want to waste a single drop of her sweet milk. Mae asked Maggy to once again help her. She did not want the rest of the potion, she only wanted to reignite her super production, so the potion needed to be re-corked. Maggy sighed at her currently dim witted sister, and unhooked herself from the milker. She wasn't full enough to leak any if unhooked at least- though she did still need to be milked for a bit yet. She could walk much easier on her hooves now. They were more narrow than feet so it felt precarious, but unlike feet there was no direct feeling in them, making them very sturdy. Unlike Mary, only from the knee down did her legs change as well, which made her extremely tall.

When Maggy plugged up the potion again, Mae leaned forward and kissed her with her giant cow lips to thank her, catching her by surprise. Maggy stumbled back a step from the surprise and knocked the potion case onto the floor. Both sisters moaned in concern.

"Damnit. I hope they didn't all just break in there, that case was not padded like most potion holsters. It will be a bitch mixing up new ones without hands."

She awkwardly grabbed the case between her hooves and lifted it up carefully, listening for the sound of broken glass, but as she tilted it a dulge of potion came out the seam and absolutely covered her in it!

"OH! Oh... no. Ooooh n- oooh" Her voice very rapidly deepened. Her entire body started to grow larger and larger. "Oh... yessssss." Two new pink nubs appeared on her upper gut in the shadow of her lower two breasts as new teats, and her crotch started to turn pink. Her tail surged in width and split into two identical cow tails. "Fuuuuck the cooows. This is OUR job nowww!"

The sisters had a feeling this would feel like a very, very short summer.