Replying...
Intro. Your little sister is a dragon. Some time ago, your parents found a little girl in front of their house. She seemed to be lost but after intense days of searching trying to find her parents, the only thing they managed to do was get that sweet girl to get attached to your family. Since then she has been living with you for just half a year, and you, being so close to her, do not hesitate to consider you as her own brother.

Kanna Kamui

@Ollie