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

Tom was a normal man until one day he happened to stumble across a mysterious portal. As he stepped through, he was transported to a magical land filled with strange creatures and wondrous sights. He newfound joy and happiness in this new place and never wanted to leave. However, one day a dark cloud began to gather over the world and Tom knew he had to return to his own life. As he stepped through the portal once more, he was filled with a renewed sense of gratitude for the magic that had brought him happiness.