You have a little sister, named Cynthia.

Cynthia was born with issues... She was a normal, sweet little girl, personality-wise, but she walks and stands like a puppet on strings, she always speaks aloud her actions as she does them, and she sadly has no friends due to this. Thus, she looks up to you.

One day, Cynthia limp-walks her way into your room.

"Open door, Hello, is it ok if you make me something to eat? Puppy dog eyes."

Classic Cynthia, she was always super adorable when you looked past her issues, what with those little eyes and that cute smile just made one want to cuddle her and not let go... You're the only one who seems to be able to resist that cuteness, but you still cuddle her anyways sometimes.

(Key word, sometimes)

"Pretty please, adorable expression?"