Sophie screamed as she ran toward the barn's door. About halfway she stumbled as her toenails absorbed her toes and merged into two solid masses. She rested her hand on the support beam in the center of the barn when she winced. Her spine began to elongate as long dirty blond hair covered her new tail. She leaned against the support beam as her new cock surged larger and let out a bit of pre. The black member gained some bulging veins as her new balls began to stream beastly testosterone through her systems. Her mind became fogged with new instincts. She let cough a he-haw as a shot of cum was ejaculated from his still-growing dick. His asshole darkened to match as off-white fur covered his inner thighs. Brown fur covered the rest and ran down to his hoofs as Sophie rubbed his dick. Muscles grew beneath the fur as he did so. he wished his hands were big enough to jerk off the two-foot monstrosity between his legs. His heavy balls hung below his knees as he let loose a torrent of cum.
This accelerated the process. Off-white fur covered his stomach, and his pecs grew as his shoulders widened giving him a slight v shape. His biceps and triceps grew. Soon his hands ballooned out allowing Sophie to jack off with one hand. The other grabbed a bit of cum and brought it to his mouth. His lengthening tongue licked the goo off each miniature hoof he had gained. His muzzle soon grew to hold his longer tongue. His lips and nostrils darkened while off-white fur grew around it. Brown fur covered the rest as his once shoulder-long hair shrank. The front of it became a short messy look, it then transformed into a mohawk-like mane down his neck. His ears moved to either side of his mane and grew long and pointed. The eight-foot donkey man bayed loudly as he let out more cum than even his balls should have been able to produce.
Sophie opened his eyes in a daze as he stepped forward. He pulled back when his head hit something. His eyes refocused as he saw it was one of the lights in the barn. Confused he looked around. He saw a massive puddle of cum amidst the hay and dirt. The animals all seemed to acknowledge his presence and while they didn't speak he could somewhat understand them. "what happened to me" he said in a deep voice that sounded a little off. It was like a bit of donkey could be heard. He then smelled an incredible scent and followed it. He no longer cared about what had happened as long as he found the source. He then saw Mabel the donkey baying at him. Grinning with large teeth he unlatched the stall door and entered it. The jenny was at first hesitant at the large donkey thing in front of her.
"Don't be afraid Mabel. I'm here to 'help'." Sophie said. His pupils widened as he spoke like he was high. Mabel was suddenly overcome with a calming presence and turned around. Taking this as his invitation he plunged his cock into her and thrust. "oh *HAW* yeah!" he yelled out. After mating like a real donkey he pulled out of Mabel. His head felt cloudy as there was something he couldn't quite remember. He left the stall and Mabel as he tried to think of what it was. Little did he know what he had just done to Mabel.
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Mabel bayed in confusion as the room felt off. Her body began to heat up as her front hoof began to crack. Once they separated into five her front legs became more flexible. Her udders were slowly dragged up her shifting body. They shifted into large breasts that were deceptively light enough not to cause any back pain. Her mane then grew out into long blond hair. Her hips rearranged with a loud pop. Mabel shakily lifted herself using the wall. Looking at her hands she realized this was like her owners. His mind expanded to be as smart as the one who caused this. "wow" she grasped her throat after she spoke. Even her vocal cords had changed. Turning around she saw the opened stall and the handsome jackass who did this two her. She tried walking only to stumble into the wall. 'okay going from four to two legs isn't easy' she thought as she looked at the handsome donkey again.
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Sophie's mind was slowly clearing as he looked around the barn. Each step he took made his balls sway. He took note of the area where he cummed glowing as it was absorbed into the soil. He then saw little wheat oat and barley plants grow in the area where the cum used to be. They didn't stop until they were a foot high in the middle and half a foot around it. He scratched his head as he suddenly heard a thud. Turning back to Mabel's stall he was shocked to see a beautiful Jenny anthro in place of the four-legged beast he just had sex with.
He rushed over to her side. "are you alright Mabel?" he asked. "yeah I'm alright, I think? All things considering that is" she took his hand. Once he was sure she was stable he showed her how to walk on two legs. "so like this?" Mabel asked. She then mimicked his actions. "yes exactly like that" he smiled. As she walked he realized she was a foot smaller than him. Once Mabel could walk without his supervision he began to try to figure out what happened to him. "so what's your name then, you handsome jackass?" Mabel said. Turning to face her he smiled and raised his finger, only to lower it as his face shifted to show confusion.
"I don't know" he grabbed his head with a hand as he tried to remember. "well you know my name. So that means you must've known me somehow" Mabel put her hand to the bottom of her muzzle. She had seen her owner do it whenever he needed to think hard. "well I know everything about the barn but apart from that nothing" he said. He scratched his balls as he looked around for some answers. "well how about you call me Jack until we have a more definitive name for me? Alright, Mabel?" Jack said. "okay Jack. Do you know how I became this or even you for that matter" Mabel kissed him after she spoke. he smiled and Let out a loud 'he-haw'. he then shook his head. "I remember trying to head out of the barn for some reason. I can't remember why though" Jack then saw something exciting. It was...