Jen began walking to school, on her way there she new she would pass by a road that had a horse stable a few miles out. She hoped that no one was taking a horse out for a ride. As she passed the road she glanced, and trotting down the road was a Clydesdale horse, without a rider. She felt herself drawn to the animal.
"OH GOD NO!" She screamed as her body jogged to the horse that waited patiently for her, it lay down as she approached its rear and she started humping. The bond was almost instant, she suddenly felt nearly 3000 pounds of flesh as if it were her own. The horses body started to change, it's gut bloated out of its sides as it's legs shrank in and disappeared along with it's tail. It's head morphed, eyes shrank away, hears and nose becoming indistinguishable, it's front legs shrank away. She tried to cry but all she could do was moan at the pleasure her new body parts were giving her as they formed. The horse's body became firm, a massive flaccid horse cock lay over her new beach ball sized balls. Jen let out a scream of horror and tried to pull away but her turning away took her entire 3000 lb. package with her rubbing it against the dirt road and sending waves of pleasure and shock through her. She instinctively jerked her manhood around toward the main road again and felt her cock harden.
"OH NO! NO! NO! NO! PLEASE! I CAN'T HANDLE THAT!" She screamed as her cock stiffened. It went from it's ridiculous five feet flaccid, expanding and stiffening, lurching itself up right, towering over the poor girl high into the air and finishing at a monstrous 18 feet tall. Unable to cope with it's size and weight, latched herself to her cock and started rubbing, kissing and licking her monster, and alien heat rose and she couldn't hold it any longer. Cumming out, her cock shot cum like an oil well, drenching the road around her and covering her in her own seed. Her transformation complete she lay against her new sex. crying at what she now possessed.