Sarah was working late in the lab, the sterile hum of fluorescent lights buzzing above her as she carefully measured out the final drops of her experimental formula. The project was supposed to revolutionize dairy production—enhancing cows’ natural ability to produce milk—but her exhaustion made her hands shaky. The sharp smell of chemicals stung her nose as she leaned in too close over the bubbling solution.

A sudden pop echoed through the room, followed by a blinding flash. The beaker erupted, splattering her face and chest with steaming liquid. Sarah staggered back, coughing, as her skin prickled with heat. Her ears rang, and beneath the sound she thought she heard… mooing? At first, she thought it was an auditory hallucination, but then—her own throat trembled, and she let out a deep, guttural “Mooooo!”

Her hands shot up to her face as bones cracked and stretched beneath her skin. Her jaw pushed forward, reshaping into a blunt, square muzzle. Her nose swelled, darkening into a wet, leathery snout as her teeth shifted painfully into flat, broad molars. Sarah blinked rapidly, eyes widening, as her pupils elongated into the dark, glossy eyes of a cow.

She tried to cry out, but another uncontrollable moo erupted from her throat. Her chest ached suddenly, her blouse straining until the buttons burst one by one. Her breasts swelled heavy and round, veins showing faintly beneath her skin, until droplets of milk seeped out and trickled down her stomach. The warm, sweet scent filled the air as streams began to flow more freely.

Then came the tearing sound. Her legs buckled as her hips expanded outward with a sickening crack, splitting her skirt apart. She gasped as coarse black-and-white fur erupted across her thighs, spreading down to thickening hooves. Her heels snapped under the weight as her entire lower half reshaped, bones twisting and stretching until her spine lengthened. With a final rip of fabric, her human waist fused into the bulk of a cow’s torso. She stumbled forward on trembling limbs, horrified to see not legs, but a full bovine body extending behind her.

An udder, swollen and glistening, hung heavy between her new hind legs, squirting uncontrollably with each unsteady step. Milk splattered across the tiled floor, pooling beneath her hooves.

Sarah’s mind reeled in shock. She was dazed, dizzy, the sterile lab lights spinning above her as she tried to form words through her trembling muzzle. Every “o” dragged into a moo, twisting her cries into something almost animal.

“SooomeOoooone… h-help me! Please, I feel sooo—sooooooo weird!” she wailed, her voice half-human, half-cow.

She stumbled in the fog of chemicals and instinct, her body trembling with the unfamiliar weight, her leaking breasts and udder pulsing with milk she couldn’t stop.