Jeremy looked at his precious Amy, his face stained with tears. "I--I didn't mean for this to happen-- oooooh..." He shuddered as sweat beaded, a pang of nausea swelling deep within.

"It's no one's fault. If it weren't for the serum, we'd be dead... Life together in our new forms is far better than being dead," Amy promised, her lips quivering as she trembled very slightly.

Jeremy clutched Amy's hand more tightly, simply nodding his head in response without being able to find the necessary words.

Jeremy took Amy on a date to the local theater a week ago. She was a massive fan of plays and performances, so the new stage production was a no-brainer as a date destination. Unsafe pyrotechnics and a myriad of safety violations led to the pair winding up nearly dead and covered in burns. They wouldn't have made it until the morning.

On word from the horrified parents of both parties, they were given an experimental serum-- a swarm of nanobots along with a solution of DNA and RNA for them to use. As long as both parties received constant nutrients, they would wind up healed and well.

As this technology was in its infancy, only animal testing had been performed. They had regrown limbs for cows and had received third-party investment from an anonymous, super-rich fetishist who had more niche needs for the tech.

Jeremy and Amy were the first human test subjects, and after five days, their wounds had healed, and they had their lives back. Unfortunately for them, there was no way to halt the further processes. The government doctors and scientists assured them they'd likely retain their essential human traits but needed to be more confident in their promises. The day prior, they had been informed that they'd likely undergo a rapid transformation in the coming twenty-four hours. Only thirty minutes ago, they felt their insides start to churn while small patches of white fur appeared on their hands and feet.  

Jeremy took slow breaths, glancing out the window to the private, walled-off gardens. "Do you think we'll completely turn into cows?" He asked, speaking barely above a whisper.

Amy hesitated and closed her eyes tightly, her eyes darting back and forth beneath their lids. 

"They said it's likely we'll retain the important human traits. I'm sure we'll be okay-- ooooh..." She shuddered as creaking and popping sounds filled the room. She felt her sensitive nipples throb and pulse against the hospital gown, her mammaries swelling. Likewise, her ass wobbled and gradually fattened.

Jeremy just nodded and placed a sympathetic hand on Amy's back. He saw how her breasts and ass grew and felt a hot throb erupt from his chest, along with tingling down his spine and through his pelvis. The fact that Jeremy would become female wasn't outright stated. Still, the government doctors strongly implied that this specific serum was made to heal female cows and that they hadn't adequately coded a variety for the XY chromosome yet. They couldn't promise how he'd be affected.

"F-- Fuck..." Jeremy winced, brushing his fingers over his chest. His nipples throbbed dully, and he felt the noticeable shape of his slightly engorged pecs. To make things worse, a slight tightness manifested within his crotch, his cocks and balls erupting with a hot, prickly sensation. "Amy-- I... I don't think..." Tears welled in his eyes as he wrapped his arms around himself and shook his head.

Amy grunted as her hips popped again. When her tongue started to feel heavy, she probed the inside of her mouth with the appendage. 'My tongue-- my nose...' She didn't want to add to Jeremy's fear, so she kept her concerns silent while a painful bump poked out from the skin at her spine's base. "Jeremy... No matter what happens, I still love you. Okay?" She wrapped an arm around her boyfriend and kissed his head. Despite her concern for him, her fear mounted. How much would change? Would she ever be allowed out in public again? Would she develop animal urges or lose the ability to speak? As she pondered, her ears spasmed and gradually elongated while growing fuzz.

"Errgggh!" Jeremy moaned again as a painful spasm sent shockwaves through his abdomen. His pecs and crotch quivered in response, the unnatural tingling intensifying by the second. He thought of the wonderful hours of sex he had engaged in with Amy the night prior. Knowing the next day brought total uncertainty, they wanted to enjoy one more passionate night. He thought of how good it felt to slide his throbbing cock into Amy's tight pussy. The mere thought of it caused his genitals to tingle, his cock twitching. Another painful ripple through his chest made his blood run cold. There was no denying the outline of budding tits beneath the gown. If he were a woman, she'd be ready for her first training bra. He shifted and winced from the excess padding on his rear, his fear growing into abject terror. 'I'm-- I'm going to lose my fucking cock.' Unable to hide from the truth, tears fell from his face. "N-- No... I don't-- I don't want to be a woman..." He begged, looking toward Amy in desperation.

Amy wouldn't love Jeremy any less as a woman, but seeing his pain made her heartache. She pulled him into a hug, ignoring her own tits inflating like water balloons and the now three-inch tail that sprouted. She felt fur slowly growing up her arms and legs, her transformation seemingly further along than Jeremy's. "It's-- it's going to be okay... No matter what form you have, I will love you. I won't care for you any less if you're a girl," she promised. She shuddered suddenly as her jawbone creaked, a painful throb reverberating through her mouth bones as they just slightly jutted out. 'We'll get through this-- we will... We have to...' 

Jeremy fervently shook his head, keeping his arms crossed while his foot rapidly tapped the ground. “No-- I… I like being a man-- I wanted to be a father-- a husband…" He stammered. His tits had grown into clearly defined A cups and continued further. Simultaneously, his waist tightened in tandem with his growing tits and ass.

"Jeremy, I--" Amy began to speak but stopped and bit her lip as her womb angrily throbbed, heralding the incoming wave of bovine hormones. Her brain and body swirled in confusion as new instincts collided with old. She could only stare blankly and tremble as she fought to maintain coherency.

Not paying attention, Jeremy stood and ripped the gown off, staging toward the body-length mirror they were provided to check their progress. “N-- No…” He gasped, seeing how androgynous he had already become. His masculine facial features had diminished, looking small and girlish. Now B cup, his breasts were perfectly shaped and perky. Down below, his hip-to-waist ratio erred on the side of feminine. He shook his head in disbelief, stepping back as fur slowly crept up his hands and feet. Against his better judgment, he stared downward and straight at his crotch. To his horror, he saw his dick and balls relocating to a position lower on his pelvis. With the expansion of his hips, he didn't have to spread his legs to make room.  

Amy moaned again as she began to get the initial hormonal surge under control. She shakily lifted her arms and saw brown-splotched, white fur up to her elbows. Vague notions of devouring greenery and relieving the tension in her now DD tits filled her mind, but she choked those thoughts back. She saw her nose flatten from beneath her eyes while her mouth reformed into something slightly more muzzle-like. Would she need to be milked from now on? Would she actually have to eat grass? She thought of her food blog and felt a surge of grief when she considered she might never be able to enjoy aspects of her previous life. "Ugggh…" She moaned and stood to her feet, desperately wanting to stand beside her mate. Her tail grew to half its maximum length and relentlessly swished while a set of horns broke through atop her head.

Jeremy put a hand over her mouth in horror, shaking her head in disbelief as her reflection gradually ebbed toward the side of feminine and girlish. “My-- my cock…” She stammered, her voice heightening in pitch. She shakily slid a hand downward and groped the space between her thighs, grabbing her pathetic cock between her finger and thumb. It was only a few inches long and dangled without hope of hardening. Panic set in, she pulled on her dick in a desperate attempt to stop its imminent recession. In response, a sharp, pleasurable jolt shot through the sensitive flesh, causing her to withdraw and cry out. "A--ahhhh!" She moaned, staggering back a step as a deep pressure formed beneath her navel. As the sensation expanded outward, her hips popped and grew in suit, her spine creaking and grinding as her back took on a supple curve.

Amy carefully stepped toward Jeremy, watching her boyfriend's reflection and staring at her directly. As Jeremy's cock faded away and her tits pressed past B cup, Amy could no longer see Jeremy as male; her every instinct insisted that a woman was standing before her. “Y-- You will be okay…” She stated half-heartedly before grunting and throwing her head back. Her own DD tits refused to stop their growth while a blanket of fur crept to her shoulders and hips. At this point, her feet wobbled, and she had to quickly sit on the bed, shakily raising her legs in disbelief. Before her eyes, her feet contorted, and her toes darkened while pulling together and calcifying. "M-- My feet--" she gasped, shaking her head as bursts of pain enveloped her ankles. "Aggggh!" Her mouth ached as it fully took on its slight-muzzle-like appearance, her ears situating higher on her head. With her ass and tits so huge, she wondered how she was expected to stand and move about. Even her loose hospital gown proved too tight as her butt and breasts chafed upon the fabric. Without another word, she stripped the gown off and let her breasts bounce free, each orb glistening with sweat.

Jeremy couldn't string together a coherent strain of thoughts. She watched and groaned as her mouth jutted out just slightly, her ears elongating as brown fur reached her knees and elbows. She tilted and examined the curve of her back, which led to an increasingly round and well-shaped ass. With such a massive rear, wide hips, and a tight waist, her shape was the picture of feminine beauty. “H-- Holy shit…” She squealed, glancing down at her C cups. She hesitantly groped her blossoming bosoms and gave a slight squeeze. "M-- Moooo!" She cried suddenly as electric shocks washed through her chest, enveloping her body with a milky warmth. Speaking of milky, she quickly noticed beads of opaque fluid coming from each nipple. When she glanced downward, she saw her scrotum pulling taut, each testicle uncomfortably ascending into her body while a seam formed down the middle and gradually split to form her labia. “P-- Please… I don't want to be a girl," she begged-- pleaded, to no one in particular, too scared to probe the folds of her forming vulva. She would never again feel Amy's hot, tight body constricting her throbbing manhood.

“C-- Come sit by me…” Amy begged her partner while gritting her teeth. Crying wouldn't stop her feet from becoming hooves or any other aspect of her transformation. Fur now coated most of her body, her tail extending to its full length while a maelstrom of cow hormones flowed through her veins. Unusual urges to graze, fuck, and more swirled in her head, leaving her unable to make heads or tails of her emotional state. How much would life change for her? Would her desires and interests end up irreparably altered to the point she was barely recognizable as the same person? As her feet became hooves, she could only hope her hands wouldn't be taken too.  

Jeremy turned to Amy with tears streaming down her face and weakly nodded. She took shaky steps forward and sat next to Amy, feeling his fattened ass spread over her mattress and offered some extra cushioning. “I-- I don’t… Want to be a girl… I'm sorry," she squeaked, shaking her head as fur grew past her hips and shoulders, her tail breaking through as horns sprouted atop her head. As her vulva took shape, strange instincts assailed her just as they did Amy. Grazing, fucking, milking-- all desires she had never felt before. What would life with a vulva be like? Would she have a happy, lesbian cow-girl romance with Amy? Would her sexuality change in the face of these potent new hormones?

"I-- I know, sweetheart… I will still love you, man, girl, or otherwise," Amy reassured as her transformation hit its final steps. Her tits sat at a healthy E-- or perhaps F cup, perky and full of milk. By now, her feet finished their metamorphosis, turning into cloven hooves. How would it feel to stand on them? Could she move properly? Relief came when she intrinsically understood the process to be ending, and her now fur-covered hands were still intact. Ending up with four hooves had been her biggest fear.

Jeremy rested her head against Amy's shoulder and tightly closed her eyes, shuddering as her insides churned and her bones contorted. She felt every minute change with excruciating clarity; her expanding tits, her growing tail, and even the itchy fur that crept its way over her abdomen and back. To make things worse, she was fully aware of her growing womb and the opening below it that inched from her body's core down to her vulva; in a matter of seconds, her new vagina would open. "Oh god-- I… I feel it… Between my legs-- a hole's opening-- two holes… I don't want a pussy…" She whined, pushing her legs together as she repeatedly shook her head.

"You'll get used to it-- I promise. There are benefits, I assure you," Amy promised. Her sensitive tits ached and leaked creamy fluid, her every instinct screaming to have that tension relieved. She was completely aware of every one of her body's changes, from her prehensile cow ears to her extra curvaceous figure and sensitive tail flicking behind her. There would be a lot of adjustments to accommodate her new body and desires. That being said, she knew Jeremy was being hit harder. While Amy received a metaphorical coat of cow paint, Jeremy was forced to endure a complete sex change.

Jeremy weakly moaned and let out a low "mooooo" while her body's changes accelerated. Her vagina and urethra popped open, causing her to squeal and tremble as a small orgasmic ripple pulsed through her freshly moist nethers. Simultaneously, her now D-cup tits quivered and throbbed with need; she bit her lip and felt her tail grow, her feet popping and contorting as they began their transition into hooves. “My-- my feet…” She squeaked, trying desperately to ignore the deep, unyielding pang of emptiness betwixt her thighs. Images of green pastures, vigorous milkings, and even of giant cock fitted in her head as her male hormones were overpowered by new, far more potent cow-woman needs.

"Your hands should stay the same-- it's okay… We'll get used to this together," Amy promised, still panting and trembling in the aftermath of her change. She couldn't deny how beautiful Jeremy looked in this form; her cow woman traits came across as highly appealing and desirable in her eyes.

Jeremy just nodded and tightly closed her eyes, fully burying her face against Amy's shoulder for comfort as her changes finalized. As her hooves took shape, pale brown fur fully coated her body, and her vulva twitched with tingly warmth. Life would never be the same, but Amy was still right by her side.  

After the couple had a few minutes to breathe and settle after their transformations finished, Amy hesitantly stood to her feet-- or rather, hooves. She wobbled a bit as she strolled, her massive ass and tits bouncing heavily with each step. Regardless, she managed to maintain her footing without falling over. "We should probably learn to walk," she said softly, taking Jeremy's hand and pulling her up.

Jeremy nodded as she stood but was far more thrown off than Amy. It took a few minutes of cussing under her breath before maneuvering this body started making more sense. Her center of gravity was utterly different, and her ample assets felt burdensome as she learned to walk again. To make things worse, her pussy continuously throbbed and saturated with viscous fluid.

Amy took Jeremy's hand and led them both to the mirror. "I-- I know this isn't much of a consolation, but you look beautiful," she offered.

Jeremy winced and closed his eyes before giving herself a good look. Amy quickly coaxed her out of that fear, and Jeremy opened her eyes, looking reluctant at her reflection. Her eyes widened upon seeing the two gorgeous cow women hand-in-hand. They both have exaggerated hourglass figures, prominent, perky breasts, and soft, feminine facial features. She looked down at the cleft marking the top of her vulva and shivered. Was that her? Was that really them? It was impossible to deny how gorgeous these buxom cow women were. "This-- is me?... This is us?? She placed a hand on the mirror, staring in awe. She kept reminding herself that she'd be dead if she weren't a gorgeous cow woman. This new body was a condition for escaping death. "You-- you will stay with me?" She meekly asked, turning to face her precious love.

Amy nodded. She was already wondering how she'd fit into shirts and pants with a figure like this. She'd likely find something that fits and could always get tailored clothes as needed. "Yes. Please stay with m-- mooooo!" She moaned suddenly as her pussy quivered. “M-- Me, I mean…” She stated in embarrassment.

~~~

"Mmmmm, yessss!" Amy moaned as Jeremy's hands massaged and pumped her breasts from behind. They sat in bed together a day after their transformation, with the doctors suggesting it would be fine for them to help each other relieve tension.

Jeremy's pussy ached in abject arousal as she squeezed and milked Amy's breasts, creamy spurts of fluid squirting out and dribbling down her tits. Eventually, Amy pulled away while panting deeply, turning toward her love with a devilish grin. “It’s y-- your turn, now…”  

Jeremy bit her lip and shifted her eyes away while clutching an arm. “I-- well… We don't have to…" Despite her reluctance, her tits desperately ached and she was almost unable to stand the pure, primal lust consuming every cell of her voluptuous cow girl body.

"Nonsense," Amy giggled as she positioned herself behind Jeremy.

Before Jeremy could complain, Amy's dextrous hands clasped her breasts from behind and went to work. "O-- oooooh!" Jeremy instantly moaned as pleasurable shocks cascaded through her massive melons. Her nipples hardened as milk dribbled out before coming in thicker sprays. The sensation of having the tension in her breasts relieved was utterly euphoric. She could hardly see straight as she mewed and moaned, entirely at her lover's mercy.

Jeremy put up no fight and gladly let Amy drain her engorged breasts, unable to resist the sexual thoughts cropping up in her mind. 'What would it feel like to be milked while-- well…' She was embarrassed to realize how desperately she wanted to experience sex with her new equipment. It was hard not to feel excited when she recalled how powerfully Amy could orgasm multiple times in a row.

Amy grinned. They were still determining how long they'd be stuck at this government facility together, but they had been assured their needs would be tended to, and they'd be allowed to live with each other. She'd learn to put up with the rest as long as she had Jeremy. "Looks like you're tapped," she teased and pulled away after some time.

“O-- oh, I see…” Jeremy panted. She was about to speak once more when Amy suddenly grabbed her shoulders and pinned her to the bed. Her cheeks flushing red, she stammered while looking at Amy. "W-- Wait; what are you?..."

Amy gave an innocent look, and hen spread Jeremy's legs apart. "There's more to womanhood than tits, you know."

Jeremy didn't doubt those words. Unable to resist, she just nodded and shifted her gaze away. "I-- I suppose a little experimentation wouldn't hurt."