Fics like just when is someday? (i'll see you tomorrow)

Lumine holds few things close to her heart; any sign of weakness can be, and has been, exploited. She's grown cold and ruthless, untouchable to those who knew her. But above all, her loyalty is with her stupid, dumb brother, who's currently trapped in a fickle cave. OR: the one in which abyss princess lumine saves aether in that weird door, they reconnect a bit and paimon is forcefully adopted

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