The new Mr. Perth (formerly Jacob the stallion) smiled as he looked over his growing herd. His former stablemate, a palomino named Brightmane, was looking at the new fillies curiously. The former Mr. and Mrs. Perth were not as calm. They were matching brown fillies with dark black tails and manes. They paced in their stalls, tossing their manes and stomping hooves.
Jacob grinned as he felt a familiar stirring in his crotch. Three fillies was not a bad start for a herd. He looked happily at the ring on his new hand and realized he could have as many mares as he wanted. He frowned, though, as he realized that the small barn was already getting full. Mr. Perth ran a cab service for the city, their single carriage providing rides around the downtown areas for people who did not want to ride in a car. The business barely kept the family afloat and was the source of many arguments. Kelly, the daughter, had some ideas about expanding the business the Mr. Perth had refused to listen to. Jacob resolved to talk to her about her ideas when she got home -- only this time her "dad" would listen closely.
That decided, Jacob returned his attention to the fillies with a broad grin. He felt his human cock straining at his pants as he decided that the former Mr. Perth needed to be bred first. "I wish you were in heat," he told the new filly. He laughed as her eyes widened and she began to tremble. Her tail flipped up as the unmistakable scent of a horse in heat filled the small barn. Her former wife looked at her and whinnied something that sounded suspiciously like laughter.
Jacob fumbled with the unfamiliar human clothing but in a few minutes was naked. He frowned at his puny human cock. "That won't do," he muttered. The former Mr. Perth had given in to her body's instincts and had turned so that her new pussy faced Jacob. The thick equine lips were already coated with her juices, ready for a stallion to mount her. His manhood would never fill her the way he wanted. He couldn't be a horse again, though, at least not yet. He liked the thought of being human and in charge. "Fine, I'll have both," he proclaimed. "I wish I had my old cock on this human body!"
All three fillies flicked their ears at him. Mr. and Mrs. Perth were the only ones to understand the words, but all of them watched in amazement as Jacob's cock began to grow. It became a mottled black and pink as its swollen head became rounded and equine. A sheath formed around its base as his balls became heavy and covered in dense black horseflesh. Jacob grasped his cock as it grew, his human fingers pushed further and further apart by its girth. The pleasure was intense, better than when his cock dropped when he was all horse. The cock head thrust upwards from his sheath rising along his body until it reached the level of his chest. Jacob rubbed his hands along his regained stallionhood. He was fascinated by the sight of it -- as a horse he had never been able to see his cock.
A whinny interrupted his inspection. The former Mr. Perth was becoming impatient, stomping her rear hooves and looking over her shoulder at him. Jacob grinned at his new herd member and returned to her stall. He smacked her bottom and told her "Kneel down, 'Mr. Perth'." She quickly obliged, her tail flipping out of the way. Jacob needed no further invitation. He crouched behind her and used his hands to place the head of his equine cock against her lips. The new mare trembled at the sensation, then neighed loudly as Jacob thrust forward. His massive cock filled her new pussy with a sensation that was unlike anything the former man had ever felt. Even stranger was the feeling of her muscles gripping the invading cock, urging it inward, milking it.
Jacob gave a shout behind her as he gripped her sweaty pelt and began to thrust his hips. The feeling of his cock slamming into the mare was familiar and yet more intense, his human sense unused to the flood of equine sensations. It was not long before he felt a familiar churning in his groin. He came quickly, filling the mare with his seed as she whinnied in pleasure.
Jacob slowly withdrew from her and watched as his cock reluctantly withdrew into its sheath. The other mares watched with interest and Jacob winked at them. "Give me a moment ladies, your turn is coming."