There is something excessively creepy about Ciel and Sebastian's relationship (that something is called pedophilia). The fact that they're involved in some sort of Faustian contract does not make it any better.

[Look, you can argue all you want about how Ciel's elevated station in life means that he is unused to caring for himself at a very personal level (dressing, bathing, etc.) and THAT is why Sebastian is constantly portrayed as so very close to him, but I think we all know how the mangaka meant for this to appear. She's a yaoi artist on the side, guys. Let's not kid ourselves.]

But on the other hand, pretty Victorian fashion??