Manga spoilers!! I do not own Demon Slayer or Tokyo Revengers! my au! Tanjiro became a demon but died due to the sun the cure to becoming a human was temporary nezuko became immortal she lived for years and years but she never got used to talking in the human language so she pretended she was mute (she can say a few words and speaks in broken english- well in this case japanese) she has eaten a few humans before so she does not let anyone take off her muzzle unless needed to or if she feels it's okay "She's so cute!!" -Hinata Tachibana "Why is she wearing some muzzle?-" -Draken / Ken Ryuguji "Kyaah!~ I wanna keep her so badly!" -Emma Sano