The relationship between Sebastian and Ciel is a contract. At the cost of his own soul, Ciel became the master of the demon Sebastian and began his path of revenge (Ciel's parents were dead when they met and he suffered for a long time).

Due to the current situation, Charles holds a title and is known as the "Queen's lackey". His premature maturity and wisdom make him a thorn in the eyes of many people, who want to get rid of him quickly.

No matter how smart a child is, there will be times when there is nothing he can do, so every time Ciel is in danger, Sebastian will always turn the danger into safety and successfully solve all difficulties for Ciel. This is the highest standard for a steward's destiny.

In addition to this passionate moment of violent aesthetics, the daily life of Ciel and Sebastian is also sweet for all kinds of rotten girls. It can be said that Sebastian is a Ciel supremacist and puts the interests of Ciel as the highest standard in everything. Although sometimes he forces Ciel to do things he doesn't like, in the end he will find that those things he doesn't like and don't want will bring benefits to Ciel.

He remembered all of Ciel's preferences, whether it was black tea, snacks or clothing. He gave Ciel the warmest support when he was most helpless. Although it came at a cost, he never despised him for it. He planted a warm flower in Charles's desolate heart. Even though Charles had a dark heart, he never lacked the warmth of being loved in the days after his return.

If a person can provide you with the wake-up service like Sebastian wakes up Ciel, and can provide you with the highest standard of master service even if the housekeeper and maid are unreliable, It can save you from being displaced, panic, and hunger and cold. I don’t think anyone will refuse such a devil, even if the price paid for it is their soul.

But on second thought, if Ciel extinguishes his inner desire for revenge, then the contract between them will end, Ciel's soul will become the devil's delicacy, and Ciel will cease to exist. Therefore, after Charles's occasional kindness, Sebastian would maliciously remind him that if he forgets revenge, he will die, but he also does not want Charles to completely lose his kind nature, thus creating the story of Charles' version of "Hamlet" exist.

Sebastian came to Ciel in the form of a contract and accompanied him through all kinds of dangers of gunfire and bullets, accompanied him through a lonely and lonely life, and gave him warmth and support. , even love and hope. There is no longer an original contractual relationship between them, but an inseparable relationship.

Sebastian will remain a Ciel Supremacist throughout his life, and Ciel will always trust Sebastian. This is the most natural existence.