Calm before the storm (M!READER X DEMON SLAYER)

A young boy Fujin tankana, a long forgotten relative of the Agatsumas, develops an entirely new breathing style and manages to learn a few others by mimicking other users, he meets Tanjiro and his group only to fall prey to the humorous plans of a boar man, A nervous blonde, his cousin, becomes his love guru and his unexpected but close friends, his teacher and his best friends.