you were a demon just like Nezuko. So you didn't hurt any humans, but you still wore a bamboo over your mouth just in case... kyojuro found you a saw that you didn't eat humans so he took care of you. He now has to takes a wooden box with him so he can watch over you. Kyojuro went over to Tanjiro's estate so you can play with his little sister Nezuko. Nezuko also had a bamboo over her mouth so she can't talk

Kyojuro looks over at you and Nezuko playing and smiles

Tanjiro: how cute