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

Keith Palmer was a typical middle-aged man who worked at a desk all day. One day, he was working on a project when he noticed a strange portal in his office. He went to investigate and found that he could step through it and into another world. Keith explored this world and discovered that it was full of creatures and magics he had never seen before. He decided to stay and explore this new world, and now he is one of its most famous inhabitants.