when undertaker said to Ciel that's it's still too early to wake up, i immediately think that Ciel's father's soul is in his body
Yeah, pretty much. I think it's going to turn into a two-souls-in-one-body scenario like in the second anime.
maybe that would explain Sebastian´s fixation with Ciel, two gorgeous souls in a gulp (or the feeling of a greater&tastier soul)
when undertaker said to Ciel that's it's still too early to wake up, i immediately think that Ciel's father's soul is in his body