The sandbox

Even if she would be more visible, she was not going to humiliate herself even more and socialize with a couple of children.

She parked herself in the corner of the pit and started drawing some figures to let people assume she was playing. In the background she could hear her sister answering her phone, but she failed to overhear the conversation. While "playing" she thought of many different things, but she tried to keep her mind away from the fact that she was naked and diapered in public. No matter her efforts, it was hard to forget her current state. Her diaper itched and her nipples got erect at every single breeze she felt. Just when she was thinking of a TV series she was watching, she felt a tap at her shoulder and gasped.

It was the woman that belonged to the children.
"Hey" she said in a childish voice. She brushed the edge of the pit and sat down next to Lauren. "Your sister had to leave in a hurry for some work business, so she asked me to look after you for today. Is that okay with you?"

Lauren did whatever she could to hide her shocked facial expression. How would an actual kid be okay with this? But at the same time this could be her chance. The woman did ask if Lauren was okay with it, maybe she could be brought back to her apartment? Or she could ask for some clothes.