What some fans fail to understand is that Ciel is constantly wearing a mask.
People who have never met him cannot tell that he is a child because he purposefully crafts an image for himself. It is not his "true" self.
We very rarely see "true" emotions from Ciel, and usually only when he is at his limit. There are certain characters (Sieglinde, Finnian, Snake, for example) who he visibly shows sympathy to because, likely, they remind him of himself. Otherwise, he only displays a certain degree of compassion to Sebastian (in later chapters) as well as what seems to be genuine care: he is afraid to lose him.
Otherwise, Ciel masks. He masks as a happy student at Weston, an aloof and mature Earl in daily life, an uncaring person in the Atlantic arc, an unaffected individual in the Ripper and Circus eras, and now, with newer chapters out, he is back to his masking. All breakdowns are private, just for Sebastian's eyes.
Relying on his visual presentation alone to determine how "mature" and "suave" he is is a foolish act, given that he is within a Victorian society and has to rely on appearances to come off a certain way.
Ciel is a traumatized, angry, and very isolated child who acts mature to uphold his position and social status. There is much to say about how he does not view himself as a child on par with others and does not allow himself childish behaviors. This is not the same as a character being naturally "seductive" or "mature".
It is especially foolish to rely on how Ciel acts among strangers, especially adults, to determine how he "actually is" because he never allows the mask to fall in front of them.
He breaks this façade a few times in the manga, but only in front of Sebastian and only when they're alone and/or when Ciel is in so much distress he can no longer pretend.
Sebastian catches him off-guard. Perhaps Ciel feels more secure around him because Sebastian is an ageless demon and not an actual human adult man. His appearance might be misleading but he is not like those humans that hurt Ciel. Still, even that does not fully secure him: Ciel still has traumatic responses, albeit less intense, to Sebastian's closeness at times.
Ciel's response to seeing the workhouse the Circus troupe believed was still standing is a tragic moment, one of the first points of Ciel's breaking. This is a child who has already lost everything breaking down. He has just relived his trauma and not only could not (and would not) take up the role of a savior for other children, he also saw that everything connected to it was a sham.
When the mask falls, Ciel breaks down into aloofness and dissociation, like in the Circus Arc, or two other emotions: grippling fear or anger. The entirety of post-twin reveal scene is him breaking into anger when the mature mask drops.
Fear is especially prominent in the Green Witch Arc when he is so terrified not even Sebastian can touch him and he has to rely on Finny, much closer in age and "safer", to calm down.
It is fairly obvious that Yana Toboso falls into a decent number of typical anime/manga tropes with her characters, but Ciel's breaking of the "adult mask" is written consistently and relatively well. A rather daunting realization to see that there are still people convinced that Ciel is this mature, serious, uncaring person with a seductive personality.
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