"Hey! Wait up!" Toby was running after me, still trying to get his monster cock in his pants. I kept walking, but slowed down enough so he could catch me. "Is this shit for real, man?" He looked scared and excited.
I nodded. "Yep. You want more of a demonstration?"
He flushed. "Well, it's cool to be bigger, but this is hard to handle."
I grinned and moved close, almost touching him. His face was slightly pointed and the goatee on his chin helped me come up with an idea. I took his hand and walked over to the nearest door. It was the janitor's closet. I don't know how I knew what to do, but I concentrated hard before I opened the door. When I did, it swung out to reveal a large sunny pasture!
I pulled Toby through the doorway out into the bright daylight. "If I did this right, we're somewhere in Ancient Greece, like 500 years BC!"
"Huh?" He looked around. "This is the past?" A large herd of wild goats was grazing close by, and a few of them came over to investigate. They had never seen humans before.
"Well, for me it's the past. For you, it's the present and future." I grinned and pulled him into the middle of the herd. The goats would normally scatter, but I gave them strong interest in Toby.
The boy was surprised by the freindliness of the animals, but caught what I said. "My present and future? Wait a minute! You aren't gonna leave me here!?"
One of the bigger males butted him playfully, and he stumbled and sat down hard on the grass. It took a second for him to realize he was naked. Then the goats were all over him. He was confused, getting licked and rubbed against and lipped all over. I could see the coarse white fur sprouting from his skin, watch his shoulders drop and arms begin the change to forelegs. He stared at himself as he transformed, until he was a very mature male goat with a boy's head.
The demon in me was in control. I knelt in front of him, taking his human face in my hands and kissing him on the lips. He looked confused, still thinking this was a dream, or a hallucination.
"Now you can fuck all you want to, and you are the biggest male here. No humans will even set foot on this island for another 20 years, and by then you'll have died of old age. Goats don't live as long as humans."
"No!" Realization finally came to Toby. "Please! I don't wanna be a goat! I want to grow up, I want to have a car, get married, get a baaaaaaaaaahhhhh."
His pleas suddenly changed into a goat's bleating as I laughed and rubbed his throat. Then his face pushed out, his skull shrinking as his head changed to match the body. I could have given him goat's thoughts and removed all his human memories, but what was the fun of that?
I stood up and headed back for the door. Toby tried to follow, but a female presented herself to him and he found instincts taking over. He was a boy forced to act like a goat now, and it would take years before his intelligence finally faded into that of a beast, with him aware of the loss until only a goat remained.
I went back to the door and looked back to see Toby humping the female, but staring at me with pleading eyes. I laughed and shut the door. When I opened it again it was the Janitor's Closet.
One down and two to go.