A/N I've been meaning to write a crossover for these two beautiful series for a very long time and when Savvi-Sin came up with this idea I knew I had to write it. As it stands, this can be either a oneshot or the beginning of a longer story. If you like this idea, please let me know or I shall likely not continue it. This was written to give a little hope to the rather sad endings of both.

Spoilers for the end of Godchild volume 8 (and the whole series) and for the end of the Kuroshitsuji anime (episode 24)

Takes place perhaps a few months after the end of both series.

Kuroshitsuji (c) Yana Toboso and Count Cain/Godchild (c) Kaori Yuki

Lyrics at the start from the song 'Ishtar' by Girugamesh

-x-

The flower that blossomed was named the flower of love,

And will know loneliness upon the surface of the earth

It was clear that the person standing on the edge of London Bridge was going to jump. The dark waters of the Thames rushed past, ripples catching the silver moonlight. High above, the man stared down into the inky darkness with vacant eyes. One gloved hand was curled gently around a railing, while the other hung limply at his side. He was so alone on the bridge, so isolated, that it seemed as though the wind alone could cause him to fall. Yes, it was clear he was planning on leaving this world.

In the darkness behind the man, the demon scowled.

How pathetic. The man had been standing there for at least fifteen minutes and still hadn't stepped into the void. The demon had no patience for the fatalism of some humans but this indecisiveness irritated him even more. Humans were so weak, he reflected. He didn't know why he still haunted the streets of London when there was no longer anything tying him here, no longer anyone of interest. The demon's scowl deepened and he took a step forward, deciding to help the dithering man on his way. The hesitation was making him sick.

Because he had never hesitated. Not at the end. The rest of humanity were but pale shadows compared to the vibrancy of that soul.

The demon approached on silent feet, clearing the railings with ease and landing on the edge of the bridge. The man did not hear him and continued gazing downwards. From here, the demon could see that the eyes searching the waters as though searching for justification were deep brown, matching the ruffled chestnut hair that was blowing in the wind. The man's face was sharp and refined, a stark contrast to his tattered clothing. The threadbare jacket was spattered with old blood.

The demon smiled and spoke in a gentle voice.

"What are you waiting for?"

The man started, fingers tightening reflexively on the rail they had only been pretending to hold before. Other than this, the man's demeanour did not change. He lazily turned his eyes towards the speaker to see a tall, slender figure clad in black. With skin so pale it shone in the moonlight the demon watched the man with eyes that burned like embers.

"What is it to you?" the man said, voice void of emotion.

"Nothing at all," the demon replied, stepping forward with a predatory smile. "Unless you're too weak to jump. If that's the case, I can assist you."

The man gave a scornful laugh and turned back to the water.

"A god damn Samaritan, are you? Not today, thanks."

The demon stopped a pace away from the man and raised a thin eyebrow.

"Oh, so you are too weak."

The man snapped his head around to glare at the demon, cold fury blazing in his eyes. He let go of the railings and balled that hand into a fist. He opened his mouth as though about to defend himself but then closed it again with a sigh.

"What do you know about me?" he whispered, voice being snatched away by the wind. "And how the hell could you 'assist' me anyway? Give me a push, maybe?"

The demon chuckled, a low and dangerous sound.

"I can end it for you," it said in a silken voice. "The pain. The anger." He smiled and inclined his head slightly. "It's something I'd rather enjoy," he added.

The man laughed scornfully. "Don't think something like that is going to frighten me. Who the hell do you think you are?"

The demon parted pale lips to speak but then paused before smiling gently at himself. He had almost let slip the reply which came to him so naturally despite having only been part of his long life for a comparatively short time. That reply could not be used anymore. He didn't wish to say the words anyway. Not to this person. The man was grating on his nerves and was no longer an amusement.

"I'm a demon," he said, carefully not smiling, in the vague hope that this would push the man into finally making his mind up. There was something enjoyable about speaking so bluntly after years of constructing riddles and pleasantries.

To his surprise, the man laughed loudly and looked away.

"Funny," he said, "I don't think you're lying but you don't look demonic to me. I've seen people I knew to be men who looked far more evil..." He trailed off. "And those who earned the reputation undeservedly," he finished in a soft voice.

The demon waited. Perhaps this human was interesting after all. There was something in the man's voice that piqued the demon's curiosity, something raw and painful that reminded him of a human much younger. He wondered whether this person had a soul anywhere near as interesting, although didn't see this as being likely. For a few minutes, there was no sound other than the wailing of the night wind and the gentle noise of the water below. At length, the man spoke.

"I believe you. I'm ready to believe just about anything. And it doesn't matter to me if the whole of London is filled with demons since there's nothing left here for me now. Not in the whole damn world."

The demon remained silent.

"Hey," the man said thoughtfully, eyes staring down but not seeing anything before them. "If you're a demon...what kind of things can you do?"

"I cannot raise the dead," the demon said bluntly, causing the man to raise his eyes in surprise. "Which is what you were asking. You've lost someone dear to you, yes? It's written in every movement you make and every word that passes your lips."

The man nodded slowly. "Fine. But you know, if you can read people that well, you should take a look in a mirror. What kind of person does a demon hold dear?"

The demon's eyes widened, crimson orbs burning in the cold darkness. The man was watching him with impassive eyes. This was comforting, somehow. He felt foolish; hadn't he become a master of deception by now? Hadn't he learnt to hide any stray emotion that may affect him behind a benevolent and slightly smug smile?

Perhaps this emotion was more than a throwaway feeling that would fade with time. If only he could believe that wasn't true.

Smiling again now, the demon bowed slightly to the man.

"Touché," he said softly. "What is your name?"

"Cassian. And yours?"

The reply was instantaneous as if they had met at a party or ball. Their breath fogged in the cold air before them. The demon hesitated for a moment before replying.

"Sebastian," he said, pronouncing the name slowly as though it was something to be savoured. "It is a pleasure to make your acquaintance, Cassian."

Cassian shrugged and turned away again. "Yeah."

Sebastian tilted his elegant profile to one side, lips curving in a smile. Eyes latched on to the man before him, he smothered the sorrow he would forever deny feeling and was struck by an idea. He wondered if it was the best thing to do, if he was ready to involve himself in such a way again. Perhaps that was exactly what he needed. A distraction. A routine.

"Are you going to jump?" he asked suddenly, catching Cassian off guard.

"Polite, aren't you?" He said, running one hand through his already dishevelled hair. "Why? Do you want to give me a push?"

Sebastian chuckled.

"Not at all. I have a proposition for you."

"Fire away."

"I cannot raise the dead," he repeated, "But there is little else I cannot do. Surely there is something else you want to achieve in this world besides throwing yourself off of London Bridge?"

Cassian glanced up, his eyes darkening.

"Yeah," he said softly. "There is. I'd like to even the score. Too many people escaped the Tower of Babel. After what they did...after what we did..." He bit his lip for a moment. "After what they did to him," he finished quietly before raising his voice. "I'd take them down with me if I could. Do you mean you can help me with that?"

Sebastian smiled and extended a pale, unblemished hand towards Cassian.

"How attached are you to your soul?" he asked in a silken voice.

Cassian glanced at the water below him for a moment.

"Neither of us are likely to reach heaven," he murmured to himself. When he raised his eyes again they were determined and lacking the emptiness of before.

"I sold my soul years ago," he said, taking the hand before him without hesitation.

"A fitting turn of phrase. Now, Cassian," Sebastian gave a predatory smile. "Tell me everything."

-x-

A/N Wouldn't Sebastian and Cassian make a fantastic duo? Anyway, let me know your thoughts lovies.