Kuroshitsuji belongs to Yana Toboso, Harry Potter to JK Rowling.

This unlikely crossover idea and the words are mine though so please don't take them.

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Let's leave unsaid what's left unspoken

Prologue: Sorting

Harry, Hermione and Ron didn't expect the things that would happen that year in Hogwarts. They were currently sitting at their table, gossiping, when McGonagall came in with the current first-years for sorting. While Ron laughed at how young they looked, Hermione couldn't help noticing that one of the kids was dressed in weird clothes. If she had to guess, she'd have said Victorian, but she didn't really want to bet her head on that – she was never big on fashion. What she could bet on was that she was one of the very few students who listened to the Sorting Hat's song. At least at the Gryffindor table – she knew that the Ravenclaws always discussed the song the following week.

'I hope they hurry,' Ron groaned as the first girl's name, Isobel Arangel, was called out and a small, blond haired beauty stepped forward. The Hat didn't hesitate to put her in Slytherin and Hermione could hear the disappointment of some second years from her own house. She huffed with annoyance.

'Well, it's only 40 of them anyway,' Harry pointed out, playing with the fork absent mindedly, watching the second and then the third scared face. He knew that many of them really wanted to be in Griffindor to make friends with him and he saw how some glanced at his direction. Then he noticed the boy that captured Hermione's attention earlier. He was standing stiff though looking vaguely bored, a bit like Malfoy had, four years ago. He wore old styled clothes and had a cane a bit alike that of Malfoy's father. Harry narrowed his eyes at the slim figure.

'Now he looks like he's straight out of Malfoy Manor,' muttered Ron and he was right, except for the boy had ashen black hair. They couldn't really see his face, but that soon changed when "Ciel Phantomhive" was called out and the boy moved gracefully.

When he sat on the stool they saw his cold, blue eye looking emotionlessly at the gathered students. His other eye was covered by a black patch, which was probably the reason behind a wave of whispers.

})i({

Well, well… Earl Ciel Phantomhive… Our guest from the far past… the voice in his head must have been the Hat's. He rolled his eyes mentally.

Get on with it, he ordered harshly. Cackling laughter filled his ears.

Impatient, like a true nobleman. Would you be interested in knowing that your mother's family was in fact a witching family? She was a squib of course and I guess it was a mistake of the wizarding world back in your days that they didn't find out about you… the Hat didn't seem bothered by his attitude but Ciel decided to ignore it. Of course our headmaster did his best to get you all the way till now, so maybe that's why. Maybe it was your little pact with the Devil that clouded the senses of wizards. Or scared them so much… In any case, there's only one house I can put you into, with a soul as black as yours…

'Slytherin!' the Hat yelled and Ciel took it off. He didn't really care where he ended up. It's not like he planned to make friends in this school. He marched off to the table where students were clapping with considerable enthusiasm. He smirked: "a soul as black as yours" the Hat had said. He liked the sound of that, fancying himself the darkest of dark in that room full of kids and good wizards.

He sat down on the spare chair and carefully ignored clapping on his back, only replying with cold politeness to the congratulations. He looked up the table and his gaze met with an older boy with platinum blond hair and cold, grey eyes. The other one was watching him carefully, without much enthusiasm, but Ciel only gave him a brief look before returning to the table in front of him. He wanted out of that room.

Suddenly the noise died down and he looked up to see that the headmaster has gotten up from his place at the table. He half listened to the speech and the promise of something called Triwizarding Tournament and the visit from other schools.

Food appeared on the table and the boys and girls around him literally threw themselves on the plates. Well, some of them. The blond, little beauty across from him was eating more gracefully and so were many of the older students. Ciel sighed.

'Sebastian…' he muttered. By the few gasps he knew that his butler appeared behind him. Ok, so maybe he wasn't the darkest of the dark in that room…

'I'm terribly sorry, Young Master. I shall do my best to prepare an appropriate dinner tomorrow. For today, would you be willing to try some of the local specialties?' Without waiting for reply, he put some food on Ciel's plate, filled Ciel's goblet with something that everybody else was drinking and moved few steps behind the chair.

})i({

Dumbledore looked around the hall, at the cheerful students. He was somewhat disappointed that Ciel Phantomhive got sorted into Slytherin, but then – what else could be expected from a person who managed to sell their soul to the devil? And literally at that.

He sighed, noting that the spoiled Earl called up his butler after all, though he knew, deep down, that it was inevitable. The child was so used to the service that he was not going to go without it now, just to do a favour to the old man. It was good enough that Ciel agreed to come to the school even if he only did it under a multitude of conditions and after making sure that he'd gain the most out of that contract. Such a sly little beast! – maybe it was better that he wouldn't be affecting Harry Potter too much – Dumbledore needed his star pupil as clean and innocent as possible.

He caught McGonagall's disapproving look, but he knew that she knew – they needed all the power they could gather. He looked back at the boy, noticing the expression of distaste as he tried the pumpkin juice. The black butler said something, to which the young nobleman waved with his hand dismissively.

He looked around the hall again. Draco Malfoy was observing Phantomhive with carefully hidden curiosity, as were few other, older students at the Slytherin table and Dumbledore suddenly wished again that he ordered the Hat to place the Earl in a more neutral house. "What if he turns to the side of the Dark Lord?" – the question that Snape asked about one hundred times echoed in his head. "Then we'll deal with him," he had replied every single time, but he wasn't so sure on how they could deal with the boy and the demon. Oh well, they could deal with the boy… The students from other houses didn't seem to pay any attention to their extraordinary guest.

})i({

In fact, almost nobody paid attention to Ciel Phantomhive that first year. The boy avoided any big groups, except for his classes in which he was quiet and did not react to anything the teacher said unless they "addressed him properly". The Triwizarding Tournament took everybody's attention and the commotion around it and the guests from other schools quickly pushed Ciel Phantomhive's existence into the second plan, which the latter apparently enjoyed.

Snape reported no relations between the boy and the rest of the Slytherins. As part of their deal, Ciel had his own apartment for his and his butler's use and he was rarely seen outside of it unless during the classes. Draco Malfoy tried to approach him, but apparently failed in making Phantomhive into his ally.

And then the Dark Lord rose again. And Dumbledore allowed himself a small smile for getting Phantomhive's cooperation on time.