Sebastian's affection for cats runs so deep that he once kept thirteen cats hidden in his closet so Ciel would not find out. Sebastian loves cats because he compares them to the creatures he used to keep over the years, which were not as lovable.
I finished a Japanese black butler. It was like, horrifying. I really hate Undertaker because he nearly murdered Sebastian. And Ciel along with Grell and Ronald. And Undertaker is Ciel's grandfather, who tries to murder their relatives?