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

Tommy was just minding his own business when he discovered a magical portal. He stepped through and found himself in a strange world. He saw beautiful flowers and animals that he had never seen before. He also saw a castle that looked like it was out of a fairytale. Tommy decided to explore the castle and found a door that led to a secret room. In the secret room, he found a treasure chest with a treasure inside.