Sara had always admired her big sister Claire. Despite the age difference, they shared a special bond. Claire was everything Sara wanted to be: smart, kind, and fun.

One day, Sara's mom tried to convince her to stop wearing diapers. She told Sara that big girls like Claire don't wear diapers. Sara, however, didn't want to give them up.

After their mom left, Sara decided to visit Claire. She wanted to see her big sister's underwear to verify what their mom had said. She was curious and hopeful.