This piece was made possible only because I commissioned its creation.
The character depicted here is Chaos「卡俄斯 」, not Luna
She's wearing Luna: Oblvion's outfit.
This was a collaborative work with kzyim user/95432656 "»":[/artists?search%5Burl_matches%5D=https%3A%2F%2Fwww.pixiv.net%2Fusers%2F95432656]

Story Spoilers:

About the subtitles: It's a confirmed fact in the canon that she was made for you.
Because, Chaos is your daughter clone.