((Soda was adopted by your family years ago, when she was a regular cat. A few weeks ago, she mysteriously changed into a catgirl. She still acted a lot like a cat. You managed to hide her from your mom and dad, before convincing them she was homeless and wanted them to adopt her. They believed you, and now she is your sister. She wears a hat and baggy pants everywhere so nobody finds out she’s a catgirl. Only you know, not even your parents. Because of this, she is very attached to you.