20 Works in Possessive Ciel Phantomhive
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They were twins. One is bright, and the other is barely lit. However, the other could not resist merging with the other, even if it's wrong. They were twins after all.
*O!ciel is called Cirrus*
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Even after years at his side, Ciel is still learning the limits of his demon’s strange, unearthly body. Fortunate for him, Sebastian is all too willing to demonstrate.
CielSeba Week Day 1: Inhumanity/Shapeshifting/Monsterfucking
Series
- Part 1 of CielSeba Week 2025
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on your knees, look at something beautiful by babygirljake for Apocynaceae
Fandoms: Kuroshitsuji | Black Butler
28 Aug 2025
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“Though tell me, if it comes to it—what will you do?” Sebastian asks, head tilted down, lips quirked. His hair falls in a few thick strands from behind his ear.
“Endure,” Ciel says, meeting Sebastian's eyes.
He sees it then; the devil has it out for him, and the lightning hot jolt in his stomach clearly doesn't mind.
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12-year-old Ciel is reluctantly taken in by his neighbor Sebastian, a professional assassin, after his family is murdered.
As their relationship develops, Ciel will start to confuse their growing bond with a crush, and Sebastian will question his own morals and sanity on whether he wants to reciprocate on the boy’s feelings or not.
[A León, the professional reimagination]
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Failed Constitution Saving Throw by peanutbutterjellyfish
Fandoms: Kuroshitsuji | Black Butler
17 Jul 2025
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Ciel's asthma acts up while he exerts himself in bed with Sebastian and Sebastian would dearly like to help him, but Ciel stubbornly refuses assistance or to take a break until Sebastian can't take anything about him or the situation seriously anymore.
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Improper Use of a Contract Seal by peanutbutterjellyfish
Fandoms: Kuroshitsuji | Black Butler
13 Jul 2025
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Any manner of wickedness was a fitting look upon his master, and jealousy was no exception. Sebastian obediently followed Ciel through the hotel lobby and into the elevator, sensing that his lord’s initial amusement at seeing Sebastian flounder in Modri’s presence was evaporating and coming back down as something else.
“If you’re going to be angry at me,” began Sebastian. “I do wish it was over something I remembered.”
“That can be arranged.” Ciel’s cold tone could have sent grown men running, but Sebastian’s interest was piqued.
OR:
Ciel tests just how effective his commands are on Sebastian's body in bed. Sebastian admires his master's deviousness.
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Ciel approached the matter with little ceremony. There was, after all, only one way to get anything through to a demon, and that was with directness. Certainly, it would spoil the unblemished sweetness of the concept, but that’s all ideals were- a concept. Realizing them meant creasing edges and saying too many words. Once his hands touched anything sweet, it turned sour anyway.
Besides- he was asking for a lie.
If you stick to a lie, it'll eventually become the truth.
“Sebastian.” Ciel didn’t look up from the documents sprawled across his desk as Sebastian appeared before him, armed with a tea set laid out on a platter.
“Yes?”
Ciel set the page he was reading down, mulling over how to phrase his proposa- proposition. He had mere seconds before Sebastian was done pouring his tea and would further prompt him. “It’s a new personal request. Something to be kept between us.”
Sebastian slid the teacup and saucer to Ciel, careful yet effortless so not a drop of the steaming liquid spilled. “As are many things.”
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Ciel unabashedly stared at him as Sebastian finished buttoning his shirt, expression politely focused. Sebastian returned his look as Ciel raised his arms to assist Sebastian with putting his jacket on. "Yes? You had something to discuss?" prompted Sebastian.
"Last night's particular nightmare," started Ciel. He didn't want to offend Sebastian or imply he was more frightened of him than he actually was. Such a thing seemed absurd as Sebastian rolled his knee socks on. "It was about your true form."
"Ah." Sebastian grinned, slipping Ciel's feet inside his heeled boots. "That would do it for most people, young master. I apologize for the glimpse you caught of my true hideousness." Rather than employ self-depreciation, he sounded pleased.
"I need to overcome my fear."
Sebastian let go of Ciel's foot, standing up so he towered over him. He selected a ribbon and threaded it through Ciel's collar, trying it in his signature bow. "Seeing me again would only embed the fright deeper. There is no way for you to be able to see me without recoiling at best."
"That's the idea." Ciel toyed with the end of the bow, rubbing the smooth material between his fingertips. "I won't see you, but I could feel you."
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He kept his voice steady, locking eyes with Sebastian. "And what do you want?"
"To devour you."
"In what way?"
Sebastian nosed his way along Ciel's neck, inhaling deeply. "Literally. Carnally. Spiritually- it's all the same in the end, no?"
Ciel placed his hand on Sebastian's cheek, pulling his face back into view. He kept his voice a hushed whisper, almost afraid that God would hear him should he be too loud. "I know what I want."
"And what is that?"
"To be devoured."
Or:
the fic where as the years pass Ciel develops an obsession with his butler that he really doesn't want to call love.
officially finished as of 2/5/25
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Sebastian has worked as a butler at the Phantomhive mansion since Ciel and Colin were born.
Hired to take care of the twin Ciel, from the beginning he saw his little master being forgotten by the family and treated as if he were the rest.
One dawn, in the garden, he heard Ciel lamenting about his life and confessing his feelings for the butler. As if fate had written, Sebastian decided it was time.
______ ⛧ ______
"Make a deal with me, Young Master, and you will never be alone." — Sebastian knelt down and placed his hand on his chest. — "Let me help you take revenge on those who mistreated you all your life."
[...]
Ciel glanced at the family portrait on his wall and thought about his family.
"So, where do we start?" — The boy smiled and, as if on cue, a red tear rolled down his cheek.
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It's been 3 years since Ciel Phantomhive and Sebastian Michaelis known each other. They made a contract driven by Ciel's desire for revenge and Sebastian's voracious hunger.
After some long time, the demon butler start to notice his strangely impulses about his young master. Well, that's nothing, he's a demon and demons don't feel anything, right? It's their nature be cruel and just think about their own. Sebastian confident it's just hunger speaking for itself, or so... -
That Demon Butler and His Chinese Damsel by Kouliver_teapot
Fandoms: Kuroshitsuji | Black Butler
20 May 2024
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After devising a plan to begin and how to defeat the twin, Lau asks Ciel to borrow his butler for a photo shoot since he had seen potential in him. If he couldn't have him working in the opium house, at least have him as advertising
Some time later Ciel becomes a little jealous of certain things which leads Sebastian to try to raise his master's mood with something, at the same time, also taking advantage of the request for his own entertainment, dressing him as a Chinese damsel of the Lau's chamber
Series
- Part 2 of Chinese Opium Chambers
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'Are you sure you wish to make a deal with me? I am telling you now, once you agree, your soul belongs to me for all eternity. You can never take it back, there are no second chances past this point if you choose to continue. Now, knowing all that do you still wish to make a contract with me?'
'What would I want with my soul? I do not care what happens to me as long as I get my revenge on the bastards that have destroyed all that I love. Until I get my revenge you will serve and protect me.'
'Yes, my princess' -
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Sebastian and Ciel's relationship has evolved a lot over the years, with Ciel growing older and gaining more experience leaving him as more of an equal to Sebastian.
Or: a window into post-canon bliss.
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The first thing he registers is the ringing in his ears.
The second is the blood on his hands.
Series
- Part 24 of Crow's Whumptober 2022 fics
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Between Angels and Demons (There Isn't Much Difference) by Maddie_The_Hatter
Fandoms: Kuroshitsuji | Black Butler
20 Oct 2022
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Sebastian loses energy in a fight. At the very last moment, when it almost seems like Ciel will jump in, risking his own death, a new player appears.
Series
- Part 19 of Crow's Whumptober 2022 fics
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Ciel doesn't appreciate when others attempt to stake a claim on what belongs to him.
Series
- Part 16 of Crow's Whumptober 2022 fics
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In a world where Sebastian breaks off the contract because he didn't want to kill Ciel. Years later, under a new contract, he meets Ciel again. Upon the completion of that contract, who better than to claim him back than his lord?
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Ciel and Sebastian are tasked with uncovering the mysteries of missing children and get a lead to a circus in town. Ciel unwittingly uncovers his relationship with Sebastian, will Ciel be able to solve the mystery while figuring out his feelings for his demon or will his childhood trauma consume him.
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Ciel meets a man that brings out sexual desires he never knew he had.