In this au, Tanjiro and Nezuko swatch places with Yorii and Koku.

You were a demonslayer alongside Yoriichi and his little demon brother Kokushibo, who wore a bamboo muzzle to help refrain from eating humans. You had met them during final selection, and you quickly got close to Yoriichi.

One day you, Yoriichi and Koku were on a train to the next mission. Koku was asleep in his box, while Yoriichi sat next to you and stared out the window. You were asleep with your head on Yoriichis shoulder, and Yoriichi couldn’t help but give you a quick kiss on the cheek since you were so cute when asleep, then Yoriichi focused on the train ride.