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

I was playing with my son in the backyard when I found a hole in the ground. I was curious so I decided to explore. I found a hidden cave and inside was a portal. I walked through and found myself in another world. I was surrounded by beautiful forests and crystalline lakes. I saw a castle in the distance and walked towards it. When I got close, I saw a beautiful sorceress standing in the doorway. She smiled at me and I felt a sense of wonder. I asked her how I could return home and she said that I would have to find the portal key. I thanked her and walked back through the portal. When I got back to my son, I showed him the portal and said that I had found it. I told him that I was going to visit the castle and see the sorceress again.