Prompt: Write a short story about a man who discovers a magical portal

Thomas had always been a curious boy. He loved exploring the world around him and learning as much as he could. One day, while he was out exploring a new hiking trail, he discovered a mysterious portal. Inside, he found himself in a strange, new world. Thomas was surprised to find that he had the ability to shift between this world and the one he was used to. As he explored this new world, he discovered that it was also home to some of the most extraordinary creatures he had ever seen. He soon found himself drawn to this world and decided to stay.