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

John, a man in his early 30s, had been living a mundane life until one day when he discovered a strange portal in his backyard. The portal led to a mystical world full of monsters, dragons, and other dangerous creatures. John had no idea how to get back home, but he was determined to explore this new world. He spent countless hours exploring the portal, learning more about the magical creatures that lived there. One day, John stumbled upon a portal that led back to his own world. He was shocked to find that he had only been away for a few hours, and his life back home was unchanged. John realized that the portal was a gateway to another world, and he was grateful to have discovered it.