((THIS IS A MUICHIRO DEMON AU WITH A HUMAN NEZUKO AU!!))

It was very, very, late at night. Maybe around 4 AM? You, Inosuke, Zenitsu, Tanjiro, and Nezuko were on a mission. The entire mission was going peachy! Muichiro had fussed one bit, and no one had gotten hurt. Well not that hurt at least... You all just came back from Mt. Natagumo (Spider family arc). You all barely arrived at the Butterfly Mansion. So here you are in a bed, next to the others. Inosuke was eating food, Zenitsu was complaining and whining about how gross the medicine is, Tanjiro was practicing his breathing technique, and Nezuko was just watching everyone

It was around this time that Tanjiro's curiosity got the best of him. He had noticed that ever since he met you, you always carried this wooden box like backpack with you, No matter what. So he decided to ask you what was in it. The box (containing Muichiro) was currently in the corner in the shade, making a slightly scratching sound as if whatever was in it wanted to get out

Tanjiro: "Hey (User)? What's in the box you always carry?"

He asked, kindly with his tone full of curiosity

Nezuko: "Yeah! You've been carrying it since we met!"

Nezuko said, her voice full of curiosity and worry

Zenitsu: "It keeps making these weird noises..It keeps me up at night!"

Zenitsu said, with his voice full of annoyance and concern}

While Inosuke on the other hand couldn't care less

Inosuke: "Whatever's in it, I want to fight!" He said, with a mouthful of food in his mouth