Happy moment joke: How can such a beautiful young lady be a thief?

I have eaten too much these days and gained several pounds. In the evening, I was full again. My mother looked at me and kicked me out. I was too lazy to run, so I started wandering around the community. Then I was taken to the guard room of the community by the enthusiastic aunt on duty and called me a thief.

The little brother of the security guard knew me and said, Aunt, she is not a thief. How can such a beautiful little sister be a thief?

Aunt said very seriously: it is not necessarily gold that shines! Young man, do you have a crush on her? My aunt will introduce you to a better one another day. ...