His Butler, Obsession.
When Ciel is some how turned into a neko, Sebastian starts to act strange around his young lord. With Sebastian being more protective, more clingy and always blushing around his Bocchan, Ciel debates if he should revile his true feelings for the demon butler.
I don't own Black Butler/Kuroshituji, just the story.
Pairing: Neko!Ciel x Sebastian.
If you don't like yoai or Sebciel then don't read.