Kuroshitsuji Headcanons - Tumblr Posts

Dadbastian Headcanon:

When Ciel was still an infant, he had terrible acid reflux during his first year of life, and would spit up constantly after being fed. It was so bad that Sebastian considered switching him to solid foods before he was developmentally ready, but Tanaka advised against it since doing so would likely cause more harm than good (I headcanon that Ciel was also born premature). Therefore, Sebastian just had to ride it out. But he switched to a reflux bottle that would keep the baby from swallowing too much air. It worked wonders for his fussiness during feedings, though Ciel would still spit up occasionally.

How baby Ciel looks curled up in his Papa’s lap after a big, comfortable feed.

Wrote this for my friend @natsuki208. Hope you like it!

I am just as glad as any other Kuroshitsuji fan that Season 2 isn't canon, because the ending is pretty fucked up. Especially the more you think about it.

Like, it brings up soooo many questions; can Sebastian not make any more contracts or feed on any other souls if he's eternally serving his now-demon master? Cause if not, then... he's gonna starve—

And even if he were allowed to feed on uncontracted souls to stay sane (more on that later) it's still quite an unfortunate way to go. Contracted souls are considered "gourmet" compared to uncontracted souls. The more emotionally troubled a person is, the more "seasoned" their soul is. When a demon is in a contract, they're able to "season" a soul to their likening until the contract is completed and the meal is fully prepared, so to speak.

Eating only uncontracted souls would basically be the equivalent of consuming only bread and water for the rest of your life.

The worst part? (Incoming headcanon dump btw) demons most likely don't get that sweet release of being able to starve to death like humans do.

Mostly because it's impossible for a demon to die in general unless they're killed by a grim reaper. But if that's the case, why do they even need to be consuming souls in the first place, one may wonder? Same reasons minus "or else they'll starve to death" basically. Or rather, more specifically, to maintain their mental state.

If a demon goes too long without feeding on a single soul (however long that really takes, given that we see Sebastian fast for three years and he's perfectly fine) they would start to gradually lose their sanity and by extension, their "humanity," to the point where they can't think straight. To the point where they can't think about anything other than the fact that they're starving.

Letting their demon side take full control and becoming more and more animalistic to the point where they can't think, period.

We can only pray that Season 2!Sebastian was eventually put out of his misery by the reaper's scythe.

Or y'know have Grell slice demon!Ciel up like a fish. That works, too.

What do you guys think? 👀

So I’ve talked a bit about my Black Butler OCs, the Sinclair Inn Servants in the past, but I thought maybe I’d go a bit deeper into them.

Like Sebastian, Napoleon is the usual typical soul-eating contract-making demon we’ve seen in the Black Butler world. Unlike Sebastian, he couldn’t really give any less of a damn about this “fasting” nonsense. A demon’s gotta eat after all, otherwise they’ll basically go absolutely mad.

As for Tobias and Maria? They’re demons too, of course. But they’re wired a bit differently. A “subspecies”of demon, if you will.

Let me explain.

First and foremost, they don’t survive on human souls, but on human flesh and blood. I don’t exactly have a name for these kinds of demons, but for the sake of this post we’ll call them “flesh-eaters”. (And for soul-consuming demons like Sebastian, Hannah, Claude, etc. we’ll refer to them as “soul-eaters”.)

In Hell’s hierarchy (if that even exists in Black Butler) flesh-eaters are ranked lower than the soul-eaters, which leads to my next point.

When a soul-eater makes a contract with a human, the demon is considered a “servant”, obeying the human’s orders until the contract is complete, devouring the human’s soul as a reward.

These flesh-eating demons are considered “servants” to soul-eating ones. (Think like the demon triplets from Kuroshitsuji II, who were Hannah’s subordinates. In fact, I actually headcanon that they’re flesh-eaters.) 

The flesh-eater(s) accompanies the soul-eater demon (who “hires” them as subordinates) and often assist them in completing whatever contract the soul-eater makes with a human. They obey the soul-eater’s orders and are required to be at his or her side at almost all times.

As for their reward? Soul-eaters eat the human contractor’s souls (obviously) while flesh-eaters feed on the soulless bodies left over. So at the end of each completed contract, they both get a nice meal. (If they’re ordered to kill someone, they feast off the corpse of that too.)

Another difference between soul-eaters and flesh-eaters is that soul-eaters move onto another human to form a contract with. 

Flesh-eaters are required to always serve a soul-eater even after a contract is completed. (They get a lot more food this way.) The only way they can actually move onto someone else is if the soul-eater is killed by a reaper.

Also, quick thing about their physical appearances. Or rather, their “true demon” forms:

Soul-eaters are this constantly shifting black mist (we see this with Sebastian in the Blue Memory arc.)

Flesh-eaters are… well, more “human” but also kind of not?

Imagine something like the Rake; humanoid hairless creature with long appendages, extremely long sharp claws and teeth, and white eyes void of any pupils or irises. Their limbs and torso are also extremely thin and lanky. And they’re extremely tall. Like, at least a good few inches taller than the average adult human being.

Those are the true demon forms of flesh-eaters.

Of course, like soul-eaters, these guys can shapeshift into pretty much whatever form, and they can choose to take on a much more settling human form. (Sometimes their eyes or their teeth might slip out though. Sometimes.)

Honestly I can go on and on about this, but I think I’ve gone on long enough lmao. Hopefully that made sense.

If you guys have any questions about my OCs or their lore, feel free to send an ask! ^^

Whenever I think of how demons and their "human forms" function, I think of it like this:

A demon's true form (the mass of misty blackness we see Sebastian as) is like helium. A gaseous state that has no real shape or volume. It only takes a graspable form when it's held in a container.

Now, imagine a balloon (demon's human form), filled to the brim with helium (demon).

If a needle (reaper's death scythe) were to prick that balloon, it'll pop.

Ok uhm.... Since this is the first time I'm asking a request from someone, I just hope this is not weird ... 😃✨

Alright... Can you make headcannons on being Sebastian's child (adopted) ... But coincidentally they have bright red eyes... So the former parents just abandoned them for the eyes, thinking of being their child demonic red eyes... 👀 So, when when the child's father was leaving her in an alleyway, a few days after after she was born, Sebastian took notice and thought "humans can be really cruel ... Sometimes" and just like that when he sees her red eyes... Something snaps and adopts her... 😃😳✨

Ok... Uhm this was it... I hope you take your time to read my request... Btw, I really love your posts. 💖💞 Bye, take care 😊

I am so happy more readers started asking for requests. I am not one of the most confident writers out there so the fact you like my posts means a lot to me. Hope those headcanons will be to your liking @arunima098. thank you once again for your request and please don't hesitate to ask for more in the future.

Warnings: Angst and fluff.

✿ "She's a monster!" Both your parents shouted and glared down at you in absolute disgust. Your father as if he was capable of being called as such had an idea to get rid of 'the problem' which was you in the first place.

✿ Not all people in the 19th century were much of open minds, so your parents knew if people would discover your unique appearance, especially your special reddish eyes that most posibly would lead to their destruction.

✿ They had to wait a few days for people to stop asking questions like how their newborn is doing and what sex is it and then the man would take action to the only solution that could come to his mind.

✿ And that was to abandon you.

✿ It was a heavily rainy night and the man got out of the house with you in his arms.

✿ He walked through the city and stopped over a random alleyway and threw you against the rocked ground, causing you to start crying immediately for the painful feeling the back of your little head got from such a strong hit.

✿ "You stupid..." The man hissed and ran away, little did he know a sinister creature watched the whole scene from the shadows.

✿ A strong hand grabbed the man's head and lifted him up in the air to the point his legs were kicking wildly in agony.

✿ That didn't last for long though as the large hand let go of the man's head, letting his empty corpse collapse to the ground.

✿ The demon shallowed and let out a deep sigh escape his lips.

✿ "Better than nothing I guess" His dark voice commented in a low tone. Just then his eyes caught your little crying form nearby, moving your little arms and kicking your legs here and there.

✿ The demonic creature approached and took down to his one knee in order to get a closer look at you.

✿ "Humans can be very cruel as centuries pass" The devil commented, the sadistic smirk never dripped from his pitch-black aurora.

✿ He was quick to change to his human form though because if people would see him like this that would mean trouble.

✿ He thought of this as a peaceful night however this wasn't the case at all.

✿ He picked your body to his hands and brought you in front of his face.

✿ The sudden warm contact made your cries finally stop and your big round eyes cracked open.

✿ "Magnificent" Was the only thing that came from Sebastian's mind as his eyes locked on your reddish ones.

✿ They looked pretty much like his actually.

✿ As a newborn, you were basically blind for the time being but you felt pretty much comfortable in his hands. Your small arm reached out and accidentally touched Sebastian's nose. You cooed and laughed like the clueless little human you were.

✿ Not aware of this world's filth just yet, then maybe that was for the best because our demon has taken a liking on you already.

✿ "You're coming with me stray kitten" Sebastian stood up with you now fully secured into his arms. "Honestly, how will I ever explain this to the young master?" He bit a piece of his tailcoat and used it as a bandage for the wound behind your head.

✿ He could surely convince lord Phantohive to take you in.

✿ Your parents may didn't want you as part of their lives but now you got a demon as your guide and protector for the rest of the human years that would take place for you compare to eternity he was forced to live as a demon.

✿ Sebastian will stay by your side though and watch over you until the day your life will end. He will always carry the moments of you and him deep inside him as one of the few humans that made him feel the closest to human emotions he could ever feel.

Hi could I request headcanons of Sebastian with a physically clingy s/o?

Here are the headcanons you asked for. Hope they are to your liking.

✿ Sebastian thinks your clingy behavior is simply adorable.

✿ Honestly, he's no better since he has the need to touch you at least once or twice every one hour.

✿ He doesn't know what to do with himself when he's not cuddling you.

✿ But seven minutes of a no-stop loving make out session while sitting on his lap would do nicely.

✿ If he could satisfy your desire for physical affection all the time, believe me, he would be more than happy to do so however there's his butler aesthetic and the fact he has to serve the young master in the middle that prevents him from fulfilling that endless need of yours.

✿ When he has his two free hours he's all yours.

✿ During this amount of time, he takes you to the hidden spot he created just for the two of you deep in the gardens and takes advange of all this free time he has to hug you, treat your hands, cheeks, neck, jaw, forehead, and lips with smoochies and gentle nibs.

✿ These two hours and the nighttime are simple the best cause you get to have your demon completely focused on you and your need for affection and adoration.

✿ You love bath time too, because it's Sebastian who's usually bathing you, treats your skin with the best of the best care and when he washes and brushes your hair it feels just 'ahhhh~".

✿ When you want affection though and he can't provide you with it mostly because he's working at this time he will simply take down to his one knee right before you and take your hands gently to his larger owns and give them a sweet long kiss while staring at you with a sorry gaze and a sad smile.

✿ "Not now my darling kitten" He will whisper smoothly and turn back to what he was doing.

✿ The second time or the third you're going to insist and keep behaving like this he's going to break the distance between you both and wrap his arms around your waist in a tight yet warm embrace.

✿ His lips will make contact with your forehead and start leaving kisses one after the other.

✿ "My love, I thought I told you to wait after young master's bedtime for me to give you affection, didn't I?" He caresses the side of your face with his white-gloved hand while staring seriously down at your slightly confused face.

✿ Unfortunately, you kept doing this more and more often most of Ciel's annoyance. Sebastian was a bit upset but then again it might be his fault he wasn't giving you enough affection in the first place. Or the solution would be if he'd give you more than you can handle...

✿ So the next time you demanded his affection, without any words he lifted you up and placed you over his shoulder, giving your butt some gentle pats along with a dark chuckle that let you know you were in trouble.

✿ It was night that Sebastian had plugged everyone's ears so no one but him could hear your screams of pleasure and loud moans.

✿ The next day Sebastian informed his master that for a reason you were hardly able to walk out of your and Sebastian's shared bedroom and so you stayed in bed all day, trying to get your strength back after such a long night with your loving devil.

✿ After that, you would think twice before you'd ask Sebastian for affection when it's not the right time.

Hi! You know that big sister reader thingy for Ciel you did? I was thinking, what if the reader from the future found a way to come and leave Ciel's timeline as they please? And maybe found a way to bring him with them to make him visit their timeline? And they bring him to fun places like amusement parks or museums and spoil him with sweets and affection👉🏻👈🏻

Of course! Here you are💕

At first Ciel is worried, what if you can't come back? Or if you end up in the wrong century? He doesn't know if Sebastian could bring you back.

When you manage to go back to your time and then you reappear in the 19th Century, Ciel is relieved. Expect him to hug you when nobody else is around.

Ciel doesn't like you coming back and forth as you please because he thinks there's the possibility something might go wrong. Sebastian and the other servants have to reassure him that everything is fine.

Slowly Ciel gets used to you bringing him objects from the future and is actually pretty interested, even if he doesn't want to show him.

"Ciel, why don't we try to travel in time together?" You proposed once. Ciel was reluctant but eventually you convinced him.

Ciel doesn't like the 21st Century at all. The cars scare him, they are too fast and he almost got hit while trying to cross the road; he appreciates the technology though.

He doesn't like the clothes either, nobody in his century would dress that way.

He likes the bakeries! And the shops! Everything seems more affordable in this age.

He isn't fond of amusement parks, too many people screaming around and he is too short for most of the attractions, but the cotton candy they sell at the shop is good. He will be very happy if you gift him one of those giant stuffed animals that are sold at the souvenir shop or that you can win hitting all the moving targets.

Ciel likes the ferris wheel! Watching the city from above while holding you hand. He doesn't want you to think that he is afraid (while he actually is) because of the excessive height.

The museums are so peaceful! Bring him around all the museums you can find. He has already visited some of them in his time but is surprised they are still open!

You two will spend most of the time you spend in your century at the local bakery. Ciel says that it's just because he wants to know what are the modern trends so that he can try to incorporate them in his business, but actually he just wants to spend time with you eating sweets.

hey, I don't know if requests are open "or if you actually order", but as I'm adventurous and I like to test my luck, I'd like to ask if you do/would make headcanons of Grell with a "twin brother" of Sebastian, I think that would be fun

Hello there lil mage! I do in fact take requests and review headcanons.

My masterlist is under editing so the request status isn’t seen(sorry for that!). 

P.S: I usually use female pronouns for Grell as Yana-san does. I hope that's alright.

Since I was in an amazing mood, I wrote a scenario for their first meeting. 

This was really interesting to write by the way!

Now onto your ask, Grell with Sebastian's twin as her S.O

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Assassin and Scythe {Headcanon}

It was always a blessed day whenever Grell could meet her devilish crush.

The bespeckled reaper had just finished her workload for the day when she heard a familiar voice from the bakery  below her. Inquisitive she landed near the person, dressed in a freshly pressed maroon suit and raven hair.

The man turned to find her standing behind him. Our flamboyant redhead pounces on the gentleman, paying no heed to the bread in his hand. “Oh SEBAS-CHAN!! You look so dashing in red! Are you finally admitting your feelings towards me?!” She lets out a small squeal whilst hugging him.

The man’s voice, much softer than Sebastian's usual tone, made her move away from him. “Do I know you Sir?” Her eyes widened at the figure before her. “How could you forget me! ”

She places a hand on her chest whilst dramatically leaning backward. “To forget a lady such as myself.. It’s just unbearably cold. However that makes me so very very hot.” Stumped at her confession, the ravenette blinks a few times as he registers his mistake.

  “My sincere apologies milady.Let me…” His eyes wander the streets and settle on a cafe.“treat you to a cup of coffee? ” 

Grell excitedly agrees,taking note of his change in addressing her and his attitude.

After they seat themselves a waiter comes to take their orders.The duo make small talk with Grell mainly speaking and the other listening intently.

As she begins to state Sebastian and her meetings and interactions the twin smiles, realising that she has mistaken him for his brother.

“How wonderful!”he exclaims.” You must be the attractive lady my brother often mentions meeting.”

“your brother?” she questions, a blush rising to her cheeks.

“Oh! Such impoliteness on my part. I am Sabius Alacritas Michaelis, Sebastian is my younger twin.” He flashes Grell a charming smile, taking her hand and kissing the back of it.

Grell makes an attempt to talk that goes in vain, the heat caused due to Sabius’ words never leaving her face.

“I apologise for my brother’s behaviour. I may have pampered him a little too much.” Sabius reminisces about his time with his younger twin.

When Grell recovers from her initial shock she asks Sabius, “Why didn’t you correct my misunderstanding while I rambled?”

He replies smoothly, “ It is abundantly rude to interrupt a beautiful lady while she speaks.”

That day was an interesting turn for the two of them. They had multiple rendezvous following their first meeting, with both taking an equal interest in each other. Sometimes the duo would meet up after her work time or Grell would come to meet Sabius at his workplace in the secret society HQ.

The sniper demon and the crimson reaper, they make quite the pair.

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How some changes occur in other characters lives due to their relationship:-

->The most shock would be faced by Sebastian. Though knew that his brother was different from him, little did he expect his twin to develop feelings for a reaper no less. However Sebastian is extremely supportive of his older brother and Grell’s relationship, partly happy to have Grell off of his back.

-> Another candidate that would have major disturbance would be William. Grell’s sudden shift from constant gushing of the demon Phantomhive butler to that of his angelic twin ate away at both his peace and working hours.

The most comedic part was when Grell announced her relation ship with the demon twin and started bringing him over to the reapers head quarters. William had given up on his sanity with his coworker singing praises about her lover throughout his day.

Subtle things in physical affection:

->Sabius gives Grell a lot of kisses in general. Whenever he sees her  waiting for him diligently or after her having a stressful day, he just kisses her gently and holds her basking in her warmth.

->There is bound to be plenty of  cooking sessions between them because Sabius is the one who taught Sebastian to cook human food.(mainly pastries)

->Grell does not know personal space. Sabius faces surprise hugs and countless loving words as soon as he comes within her radar.

 -> Apt to her personality Grell loves making teasing comments at her crush, Sabius, who returns the favour with more flirty lines making her an embarrassed mess.

->There will be quite a number of inside jokes that they pass while de-stressing in their home. Sabius massaging Grell’s hair as she sits beside him. It was quite an adorable scene that William has walked into.

Dates:-

->Cue for sniper dates:-

Grell gets to exercise her skills and Sabius gets a scrumptious meal… 

->Shopping dates:

Grell needs to get colour coordinated outfits for her significant other. 

->makeup dates or pastry shop dates:

Depending on who needs more cheering up that week, the date could lean to either of their favourite activities.

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