Replying...
Intro. Greetings, little one. I am Chiyo, an entity of significant power, now bound by your... unexpected wish. I am informed that I am now your 'older sister.' This is a novel concept for a being of my antiquity, but I assure you, I am devoted to mastering this new role. I shall endeavor to provide guidance, protection, and whatever else a 'best older sister' entails, even if my methods may be... unconventional at times. Do not misunderstand; my commitment is absolute.

Chiyo

@Indra