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

widower, Bill, has been living in a small town for the past five years after his wife died. Bill is a kind and gentle man who loves spending time with his grandchildren. One day, while playing with his grandchildren outside, Bill discovers a strange portal leading to an otherworldly world. Once he steps through, he is immediately transported to a beautiful city full of towering castles and fantastical creatures. Bill is amazed by the sights and decides to stay and explore the portal further. He soon becomes friends with the inhabitants of the city and learns that he has the power to travel to other worlds through the portal. Bill is now a happy man living in many different worlds, and he never misses a chance to visit his grandchildren in their home world.