Clay grinned and squatted down to look into Adam's eyes. "What was the one animal you and I always envied? The one we wished we could trade places with just for an hour or two?"
Adam thought for only a moment and looked back with his own grin. "Shit! You can turn me into Old Man Simmon's Clydesdale? The stud?"
His friend chuckled and reached out to tousle Adam's hair. "Even better than that. A Clyde, but a young super stud, perfect in every way. Dude, I'm talking bloodline champion and horse cum factory all rolled into one."
That made Adam grin even more, but only for a moment. His face fell. "Dammit, Clay! You know it doesn't matter how great a horse is if he don't have papers. I'd be lucky to fuck a donkey to give someone a big mule."
"Have faith, buddy!" Clay stood and went back to the computer. The other kids were all staring at Adam with wide eyes, some whispering to each other. "This will do more than just make you look like a horse. When we're done you'll have a complete history, paperwork, vet records. Shit, I bet we'll even find old videos of you as a colt on Facebook."
That confused Adam. "Huh? No way that's possible. I mean getting turned into a horse is fucked up enough - but you'd have to change..." His eyes widened as the implications hit home.
"That's right!" Clay finished typing entries into his computer and raised a finger over the Enter key. "This will change everything - you'll be a born Clyde, and Adam the human will never have existed." He winked. "At least to everyone but you and me." Then he pressed the key.
There was pain unlike anything Adam had every experienced, pleasure greater than he had ever known. His body exploded, imploded. For a split second he seemed to be sucked into utter blackness that became blinding light a moment later. He screamed. He whinnied.
And then he was in the barn with Clay stroking his muzzle. The group of kids were looking up at him with half smiles, and also obvious disappointment. Some of them started to wander out, while a lanky black kid near the computer sighed and said "Well, it sure sounded like it would work. Maybe we can figure this thing out later."
A couple of the girls joined Clay petting Adam's massive, furred sides. They giggled as Adam's erect cock rose slightly with each heartbeat, producing a small spurt of thick yellow-white fluid. One of them said "He'd never be happy as a human anyway. Can you imagine what trouble constant cumming would be?" The other girl laughed. "Yeah, at least here he has a constant stream of girlfriends to fuck."
Adam felt dazed and confused, but also overwhelmingly content. It was nice to have the girls patting him, but Clay's warm hand on his muzzle was what truly made him happy. The teen's scent was ingrained, hard-wired into Adam's brain. It wasn't until the other kids started leaving that it occurred to him why he was so much bigger. He was a horse. A Clydesdale stallion with an enormous erect cock that never stopped dribbling. He was young, healthy, well cared for. That all came from his own rich scent which his brain deciphered easily. There were mares not far away, many in heat. His nose told him that too. Part of his mind was really happy with that, the part that knew he had been born in this barn, been raised by the human male now rubbing his chin, training, brushing, grain, pastures, saddles, wagons. The whole of his life from his first wobbly steps as a newborn foal three years ago to this moment as a powerful and magnificent stallion.
But there was another part of his mind that knew he had been a human teenager just a few minutes ago, and remembered growing up on a farm a couple of miles away. He knew the human as Clay, his best friend since elementary school. All of that life was in his head as well - birthday parties, and schools and chores and his human family, riding a bike, using his hands, planning his future.
Clay kept rubbing his chin and leaned close to whisper "I know it's weird. Just hang in until the others are all gone. This is so awesome!"
By all rights, Adam should be in total panic mode right now. But all it took was Clay's gently touch and the sound of his voice, and Adam felt completely content. He was a horse. That was OK, because Clay wanted him to be a horse.
The last of the other kids finally left the barn, and Clay patted the side of Adam's neck. "OK, buddy. Let's see how successful this was. I set the Chronivac to: