This is just a short story, not sure if I'm going to continue at all. I didn't do much research (as usual) so I'm not sure if this is even a popular crossover (probably not, with my luck xD) so if you're interested, enjoy, if not, enjoy anyway!
This is basically just a fic about some Black Butler and Supernatural characters interacting, not much of a plot, but I hope y'all like it!
[Also this is my first story off this account, so I'm hoping to build a different, hopefully more sane fan base. I'll appreciate any feedback!]
"Sebastian!" Ciel's cry tore through the still air, ragged with distress. The butler's ears perked like a cat's and in an instant he was by his side, dark hair ruffled by his speedy arrival.
"Yes, young master?" Sebastian placed his gloved hand over his breast, smiling slightly at the sight of his young master's torment. This boy is the best contract I've ever made. Ciel was seated at his desk, and he glanced up at the butler with one uninterested eye, noticing his smile.
"What are you smiling at? I just needed you quickly, that's all." Ciel scoffed and turned to look out the big window behind his desk. He held up a letter. "It's from Queen Victoria. Read it, if you will."
"Yes, young master." Sebastian plucked the letter from Ciel's delicate fingers and slit it open, pulling out the thick letter inside.
"To the Head of Phantomhive Manor," Sebastian began in his honeyed voice, "The queen of England…" his voice trailed off.
Ciel looked up. "What is it?" he demanded, a spark in his blue eye.
Sebastian lowered the note onto the table. "The queen of England, young master…it appears she is dead. And her guards want you to find her assassin."
"Her guards? The queen of England's guards want me, top of the British underworld, to find her assassin? Why don't they do it themselves?"
"You are the queen's guard dog, young master. Perhaps they can't do as good a job as you ever did." Sebastian couldn't stop the smile from flitting across his face.
"Oh, shut up," Ciel stood up. "We're going into London to investigate. Tell the servants to entertain our guests when they arrive until we return. I'll be waiting outside."
"Of course, young master." In a flash, he was gone.
"Are you Ciel Phantomhive?" A rough voice suddenly came from behind Ciel, and he jumped and spun around.
"Who are you? How did you get in here?" Ciel immediately fired questions at him while trying to slow his wildly beating heart, taking in the man before him. He was dressed very informally, with a beige trench coat covering his body. He had dark hair and blue eyes, eerily similar to Ciel's own eyes.
"I am Castiel," the strange man said, "But you…you are only a child. Are you Ciel Phantomhive?"
"Sebastian!" Ciel called, backing away from the man, Castiel.
"I would advise you not to do that," Castiel stepped forward, and Ciel noticed a silver blade in his hand, previously hidden by the shadow of his coat.
It was then that Sebastian entered the room, glancing wide-eyed at Castiel. "You? What are you doing here?"
"You know this man?!" Ciel questioned him, "Who is he? Why is he here?"
"Calm yourself, young master, he is not someone you should fear. He did not come for you, if he did you'd already be dead." Sebastian comforted Ciel, and Castiel walked towards Sebastian.
"I know what you are, butler," he held the blade in a ready position, "and I should advise you I did not come alone. This will not end like last time."
Sebastian laughed. "Oh? Well, I should hope not, that ending was horribly boring. Now, if you'll excuse us, we have some business to attend to. You see, the queen has just been murdered."
"Your queen is fine," Castiel said, "Crowley's setting a trap for you. I wanted to get to you first. I brought friends this time."
"Why would Crowley want to trap me? And you don't have friends, Castiel." Sebastian moved slowly towards Ciel as he spoke, which worried the boy even more. He had never seen his butler so uneasy around a man; and as far as he could tell, this Castiel was no demon or reaper. So what was he? And why did he intimidate Sebastian so much?
Castiel moved closer to Sebastian, slowly positioning himself between the demon and the boy. "He's angry with your contract, Sebastian. You know how much he stresses the usual terms. And this—well, this is far from the usual terms."
"It was not under usual terms in which we made this contract, Castiel. The contract is fine; the boy knows all the terms and has agreed to them."
Ciel spoke up. "It's true, I have. Why don't you tell me just who you are and how you got into my house, Castiel?"
Cas turned to look at the boy. "I am an angel of the Lord, Phantomhive. I can smite you as easily as this demon here, who won't live long enough to worry about what Crowley would do to him."
"Who's Crowley?" Ciel was getting frustrated at his own lack of information.
"Crowley…he's the king of hell. And he's your butler's real boss." Castiel turned back to Sebastian. "Now, you cause a lot of trouble with your little rewritten contracts in the future, so I'm here to put a stop to it before it starts."
Ciel noticed two shadows on either side of the doorway behind Sebastian, and in the second his mind realized what they were he called out, "Sebastian!" but it was too late. Water leaped across the room and the butler growled in pain as it burned his skin. He tried to run to Ciel, but Castiel was suddenly in front of him.
Before Ciel could comprehend what was happening, the silver blade was in his beloved butler's heart and Sebastian was looking at him with shocked failure on his face. "S-Sebastian?" Ciel fell to his knees. He's not really dying, he's faking it, he's done it before, he can't be dead…he's all I've got left…
But somehow he knew this time was different. The two shadows that threw the water became men, standing in the light and looking down at him pityingly. Everything was happening in slow motion. Castiel ripped the blade from the demon's chest and Sebastian fell to the ground.
"Sebas-stian…" Ciel crawled to him, and the angel stepped away, towards the two other men. "You…you're gonna be ok, aren't you? You're not going to leave me?"
"Young master…" Sebastian's voice was weak. "Even I can't survive that. I…I'm sorry. I couldn't…fulfill…the contract."
"No…no!" Ciel took the patch off his eye. "Is it…is it still there?"
"It's fading…quickly. I'm sorry."
"Sebastian?" The butler's body was still, his red eyes dim. "No…you can't leave me…you promised you wouldn't leave me! Don't leave me alone!"
He was gone. Ciel couldn't stop the sobs from wracking his body, the tears from streaming down his face. He glared at the angel, Castiel, through his tears. "You took him from me! He was all I had and you took him!" Surprised by his own emotion, Ciel staggered to his feet.
I can't kill him. He's an angel. He killed Sebastian. I can't kill him. I have to go. He moved his feet, one at a time, slowly. The door. Get to the door, then run. Down the hall, down the stairs, find Mey-Rin, or Bardroy, someone.
His legs failed him and he fell to his knees again. "Sebastian…" he whispered. Castiel stepped forward, the other two men hanging back and looking confused.
"Cas, what's this kid's deal? Didn't we just save him from a contract?" The shorter of the two asked the angel.
"Sebastian was a freelancer, if you will," he spoke quietly to Dean, and Ciel listened without really hearing the words. "He negotiated his contracts differently. It's possible he never fulfilled this boy's contract. He never got Phantomhive's soul, and the boy never got whatever he was promised."
Castiel approached Ciel. "What were you promised, Phantomhive?"
Ciel looked up at him. "It doesn't matter now," he whispered, surprised he was able to get the words out. "He's gone. I'll never get it."
"What were you promised?" The angel repeated.
Ciel suddenly smiled. "H…haha….ha-ha-haaa!" He let out an uneven string of laughter, until he was laughing uncontrollably with tears running down his cheeks.
"I never…I never trusted anyone!" Ciel yelled. "I blocked everyone out, so I wouldn't have to deal with this! And now you've ruined it! He was the only one I trusted! I thought he was invincible! And you've ruined it!"
"Um…Cas…" the man spoke again, but the angel shushed him.
"Kill me!" Ciel screamed, laughing and crying. "I have nothing to live for anymore! You've ruined it all!"
"I'm not going to kill you, I came here to help you," Castiel spoke, reaching out a hand to the mess of a boy on the floor.
Surprisingly, Ciel took his hand, silencing his laughter, though the tears didn't stop. Cas pulled the young boy up, and Ciel suddenly used his momentum to fall onto the angel's blade, which he had been holding in his other hand.
"No!" The three men shouted in unison, rushing forward. Ciel fell back against the floor, laughing as the blood filled his lungs.
"You…never win…do you, angel?" Blood speckled his lips. "Well, I'm not guaranteed to go…to hell anymore…probably still will…" He laughed again.
"Cas, heal him!" the taller man said, but the angel shook his head. "I'm not healing someone who doesn't want to live, Sam."
Ciel looked up at him. "Th-thank you—" he coughed up more blood "—for ruining everything…and letting me die…no life…no family…no revenge for what…what they did to me…"
"Who are they? What did they do to you?" The shorter man asked.
"If you ask…you have to fix…" Ciel laughed. "You killed…the one who would…fix it for me…" he coughed again, his breathing punctuated by the blood gargling through his airways. "Now it's…your problem…" The three men stared down at the young boy, barely thirteen years old, laugh with his dying breath.