Jacob was making a delivery to the farm when the change struck. He had found his body convulsiving and changing while going through a similar change to Jenny.
His hands and feet hardened into hooves while his legs and arms grew longer and more muscular. His torso had barrelled out and his pecs were lost, replaced by a horse ribcage and his backside had grown three times as large as it originally was. With his spine forcing him on all fours, her had to stand on his newly formed hooves and he continued to change.
His hair grew out slightly too as it took on the form of a short mane, while his teeth had hardened more and taken on the appearance of horse teeth.
A rather noticeable change was with Jacob's penis and balls. His testicles had certainly grown larger and he could feel their added weight as they hung below him. His penis had also began to grow much larger and thicker. It even took on an extremely pink hue as a secondary change had underwent by it. Due to horse anatomy, his penis went flaccid while it retracted into a sheath that originally was his foreskin, but with now more skin to make it a sheath.
With the final change being his body hair, it changed to take on a much smoother feeling and it matched to colour of his tanned skin. It made him look like he had regular human skin, but it felt like the fur of a horse.
While his mind wasn't affected, his increased testicle size meant that he was producing much more testosterone then a human mind could handle. This dampened his human mind slightly as an urge to mate over took his instincts and he wandered into the stables to look for one.
As Jacob walked in to the barn, he saw Carly and Jenny in there. Carly and Jenny looked over to see who had entered the barn and Jenny stood mortified at who entered.
"Well Jenny, it seems you have a guest here to meet you. I'll give you two some privacy." Carly said to Jenny as she locked the barn door, keeping the two human-horses inside.
Jacob trotted over, his penis erect out of its sheath, to Jenny. Jenny was moving back in fear until her large ass meet the side of the barn and she had no where else to run to. With no time being wasted any more, Jenny was pinned by Jacob ready to be mounted. Jenny could only cringe as new sensations overcame her and she neighed loudly.
It was so strange it being her first time. Her pussy was being ravaged by a large penis that make her feel weak in the knees. Each thrust made her hips gyrate and wet sticky noises were being made.
She could smell the musk wafting off Jacob, the salty smell of cum and sweat filled Jenny's nostrils. In her sanity, she would have hated to smell it, but as of now, she found herself lustily liking the smell. Her gyrations became more pronounced as she eagerly took in the mass human-horse cock that Jacob possessed.
Unknowingly sacrificing more of her human intellect to her human-horse instincts, her eyes dilated at a loss of individuality. She had sacrificed the worries of humanity to the simple lifestyle of a horse. She didn't care though, a horse shouldn't care.
It was about 10 minutes until the two of them were done and Carly re-entered the barn. She was greeted with both Jenny and Jacob eating away at at a bale of straw, which seemingly went against there human minds.
Carly, on further glance, had noticed there eyes looked more dilated, seemingly more animalistic and not human like.
"Hmm, seems Jenny and Jacob have lost there human intellect after that session of mating. Well, it just means I don't have to worry about dealing with two intelligent animals while I'm living my life and I can treat them like those humans treated us." Carly pondered
With this opportunity, Carly didn't know where to start with her new life. She could go into town and see how other horse-humans like her had changed. Maybe she could see if theres any lose human-hirses running around and then take them back to the stable. The ideas to live this life are endless.