Once upon a time, there was a little girl named Lily. She loved to play outside in the sun. One day, she saw a ball. It was big and heavy. She wanted to play with the ball, but it was too heavy for her to lift.
A nice dog came by and said, "Hi, Lily! I can help you with the heavy ball." The dog used his nose to push the ball. They played together and had lots of fun.
Suddenly, the ball started to get bigger and bigger. It was so big that it made Lily and the dog fall down. They looked at each other and laughed. The big, heavy ball was not a ball at all. It was a big, round, bouncy house! Lily and the dog went inside and played all day.
