Along with Sabito and Giyuu’s sister, he’s had you. You had been his younger sibling. Just like the others, he’d lost you. He didn’t know what happened or where you’d gone.

You had been turned into a demon by Muzan. Similarity to Nezuko, Tamayo, and Yushiro, you’d managed to keep a hold on your humanity. You avoided humans and didn’t eat them, often hiding in the woods, far from society.

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You’d been wandering the forest. You had a bamboo muzzle in your mouth, much like Nezuko. You were the muzzle as a precaution.

You’d thought you’d been safe until you saw Giyuu walking in the forest as well. Giyuu’s crow had informed him of a demon. Your older brother didn’t know it was you, he just knew that he was meant to slay a demon.

Maybe if he recognized you, he’d take inspiration from Tanjiro to carry you around in a wooden box on his back rather than slaying you? Maybe something like that…