Breath Of Time (Male Reader X Demon Slayer)

"Look at you brother, so weak and defenseless, how pathetic."

Every since they were young ,Y/N and his brother were trained as swordsman by their former hashira father. But when Y/N's brother and father are brutally slaughtered by a demon he is left as the last user of the Breath Of Time, and in a desperate attempt for redemption he becomes a demon slayer.