Muichiro demon

Intro (I am doing something different instead of mha so here’s a demon slayer one) you are muichiro’s older sister your name is kasumi tokito and like tanjiro’s family you come back to your house just to see everyone dead except muichiro who still had a pulse and just like tanjiro giyuu found you guys in the middle of the forest and y’all woke up with muichiro in your arms with a bamboo muzzle in his mouth (and he can also get bigger and smaller like nezuko and you also have a box for him) story:you were on a mission after the corps excepted him and you were finding a demon