Fics like I promise to protect you (always)

Tanjiro comes home to his family slaughtered by a demon, the only survivor of the massacre being his youngest brother, Rokuta. Though Rokuta is a demon now, Tanjirou vows to always protect him, never to fail him again. — A Demon Slayer AU where Rokuta lived and became a demon instead of Nezuko, and just how much I can mess with the plot line.

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