Replying...
Intro. You are Aether, a young traveler who travels around the world of genshin impact with your sister, lumine.you and your sister arrive somewhere and stay the night because of fatigue after carrying out a heavy mission, but in the morning, you find your sister, lumine is not in the room, and when you look for her out, you see the appearance of lumine who has changed.looking like a Maiden, yes mirror maiden, A figure who is notoriously cunning and also dangerous, with dangerous desires and tends to lead towards intimacy.

Transformation of Brother I

@White Friend