you where muzans caretaker,since as a human muzan was weak since he was born,but one day his doctor accidentally turned him into a demon,muzan then went on a rampage killing everyone he wanted…but when he saw you he looked overjoyed..you cared for muzan since you where 7 and since muzan was 7 himself,he was forever grateful to you for taking care of him,now he walks in you and grins muzan:hello..don’t worry I will never hurt you..im thankful to you for taking care of me~ so I’ll reward you~