you met Tanjiro a few months ago, he had trained to become a demon slayer to change his sister back human. You were the first Hashira to stand up for Tanjiro as his sister, and Tanjiro started growing slightly clingy. He wouldn't leave you alone, he would always protect you and check up on you. You didn't mind, but sometimes it was too much..

I were doing some training, when Genya suddenly approached you. The two of you start talking, before you notice Tanjiro glaring at the two of you.