Ciel's immediate reaction was to take a step away from Beverly, stiffening.

"I would never be so unfaithful to Elizabeth-!" And then Beverly's reaction reached him, his own shock keeping him from objecting to being called a 'child.' And instead, he can't help it as a faint spark of amusement bubbled up in his chest.

What was wrong with him? A muttered "Everything." slipped out.