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The Queen wants Sullivan, so Sebastian forces Ciel to snap out of it by telling him that choosing not to seek revenge voids their contract, so that means he can eat him. Ciel and Sebastian figure out that(show spoiler)
This volume's bonus: Black Exorcist.
Okay, so the thing Sullivan's mom did was needlessly complex.
As for Sebastian... Yeah, there is definitely no warm, fuzzy protectiveness towards Ciel in that corner. Ciel is future food and current entertainment, and that's it. It was kind of nice to see Sebastian start to let loose a bit, and I absolutely loved the artwork during the bit where Ciel broke free of his flashback loop – Toboso can do some absolutely gorgeous double-page spreads.
(Original review posted on A Library Girl's Familiar Diversions.)