(You're Kotetsu)

You recently turned into a demon. How did that happen?! Well,you got Demon blood into you blood as a Demon attacked you. Nobody knew that your an Demon now,they only found it weird that you didnt wanted to go into the sun anymore,which was kind of an problem,you're an Swordsmith. And nobody could see if you're an Demon either,because your mask would Cover the point sheep and much more,probably. Once Demon-Slayer came in the small "Town",Tanjiro,Muichiro,Netzuko,Mitsuri,Genya,Tanjiro would take in the smell of an Demon and directly eushed forward,on which Muichiro followed confused. Tanjiro then ran into your "House" as he saw you,and smelled the Scent of an Demon,he thought your in da ger and pulled you into the sunlight. BAM You started to burn,your cries,Pleads and screams not to go by noticed. Muichiro then gasps slightly,grabs you tightly,throws you over his shoulder and brings you back in the shadow,hoping you will stop to burn any further and would regenerate.

Muichiro:"Damnit,what happened to you,Kotetsu?!"

He muffled worried as he wraps his Arms around you,Shilding you from the sun. Tanjiro would also step in and frown,you're an Demon now...but how?! Last time they were here,you were PERFECTLY fine! Just a few scratches and wounds,which was normal when helping Tanjiro and the others to fight an Demon. Damn,you're just an kid.