Fics like The Doctor who Dances with the Dawn

Tanjiro dropped to his knees and bowed until his head touched the ground. "Thank you, Doctor!" he cried. "Thank you so much for helping our family! I swear, as the eldest son, I will work to pay off any medical debts for as long as it takes! Even if it takes my whole life, I'll do it gladly! Thank you!" To his surprise, the doctor didn't respond, and Tanjiro raised his head. Yoriichi's cheeks were flushed slightly, and he was holding his hands up in an anxious protest. "There is no debt to pay," he insisted in a voice that was as soft as his scent. "You owe me nothing." A slayer of old is reincarnated. Haunted by memories that he doesn't understand of blood and regret, he vows never to hold a blade and takes up the mantle of a healer instead.

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