While Swinel began to grow his sty of pigs, across town another escaped animal was searching for humans to bring into his herd. The project had been so successful with the pigs, the scientists decided to expand their tests to other animals. Among them, was a herd of horses and donkeys.
The largest of them all was a massive black stallion with a long white blaze down his face. Equus watched Swinel sneak out of the facility. And he followed suit as soon as he got the chance. Now free, he went about searching for other life. Equus trotted through the wooded area behind the town, so as not to attract attention to himself.
Then, he caught the scent of other horses at a nearby farm, and decided to investigate. He went through the pasture, proudly looking at the mares who were running alongside the fence. They all wanted him. Equus threw his head back, and neighed an order to the mares. They all stopped running and proceeded to turn around and present themselves.
Equus pranced up to the bay mare first, and jumped onto her back. His massive equine prick penetrated the mare's folds, and Equus quickly started pumping. It took him all of five thrusts to get the male to cum. And as her pussy clenched around his cock, he came as well. Cum spilled out, and the other mares quickly ate the grass it fell on. Thus infecting themselves.
Satisfied at the moment, Equus now sought out human companionship. He turned his head towards the barn in the distance. He could vaguely smell humans. He jumped the fence, and slowly walked to the double doors. Inside, the two farm hands were busy. Not cleaning like they should be.
Mark and Jules had passed out in the tack room, having spent their afternoon fucking each other senseless. Equus saw the two sleeping humans, and immediately knew what to do.