Just a quick oneshot I wrote a little while ago :)
Sebastian's POV
'The end has come, young master.' Stepping closer towards the helpless child, I removed my gloves from my bloodstained hands. Ciel's eyes narrowed and he turned away from me, picking up the eyepatch that had fallen off his face. The sight of him made me all warm and cosy inside, something that I wouldn't normally feel. Somehow, I felt as if he protected me in certain ways too. The way he would treat me as his dog, and the way I would treat him as mine. The way in which he would call my name.
'Sebastian.'
A small sigh escaped my lips, and I bent down to Ciel's height, dropping the bloodstained gloves on the ground. Staring into his deep eyes, the mark of the Faustian Contract on my hand burned more than ever, and Ciel's right eye began to bleed. I narrowed my eyes seeing him in such pain, and pressed a finger to his warm lips to stop him from crying out. A single tear ran down his ivory face, merging with the blood that stained his cheeks.
'Now.'
Ciel's POV
The older male grinned and widened his demonic purple eyes, breathing heavily as he did so. To think that my life had no purpose anymore was indeed a strange thought, but I had got my revenge at last. There was no need for my existence anymore, but I couldn't have done any of this without him. I wouldn't be where I am now.
Where would I be?
*three years prior to the story*
'Lizzie, I told you to let go of me!' Lizzie had got up to her antics as usual, decorating the manor with bows and all sorts of disgusting frilly things. Gross.
'But it looks so much prettier in pink, don't you think soo~?' Lizzie said, twirling round and round wearing the dress I had bought her for her 13th birthday. She came over and ruffled my hair, placing a pink flower in my breast pocket and grinning.
'Gah... Okay, I'll keep it up-'
'YAAAAAY!' She began to dance, spinning round with her hand in mine. I could see Sebastian smiling from the corner, playing a piano with one hand and attempting to push Grell away with the other. All was happy and peaceful.
*end of flashback*
How three years had passed so fast... but none of that mattered anymore. I would leave them behind on this wretched, evil planet, but they were just my pawns in the eternal game of life. That's right... In order to win, I had to play against the rules. Leave it all. Fight the world.
Sebastian bent down to my height, and rubbed the mark of the Faustian Contract that was placed on his hand. My eye began to twitch and bleed, and I narrowed my eyes in pain. Placing a finger to my lips, Sebastian wiped away the tears and blood that stained my cheeks.
'Now.'
'Master. You are a strong, young man with a strong, young soul. We may meet again in the afterlife, but for now, Ciel Phantomhive, I bid you farewell.
I win.
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Sebastian's POV
The soul was indeed an interesting thing. Buried deep within humans, the only way to retrieve a soul was to physically tear it out of them. We demons do not possess a soul, nor do we need our own, yet we require them to carry on our existence. It was indeed a long while ago since I last ate a humans soul. Removing the finger from the young boy's lips, I watched him fall back slightly. I supported his back with one hand and cupped his face with the other as his eyes closed gently, and slowly.
'Itadakimasu.'
I closed my eyes, leaning in closer to Ciel. His lips and mine connected, and the soul within him began to burn and glow. I deepened the kiss, sharing secrets as our lips glided against one another-
No! I jerked my mind free. Reaching past the kiss, I dove into his desire-possessed mind and pressed closer to get it out of him. He moaned slightly and parted his lips, giving me access to the spirit inside of him. Our bodies pressed even closer together, virtually crushing his body between mine and my hand. Seizing it with a firm grip at last, I tore it out of him and let go, devouring the young soul. His lifeless body fell to the ground like a feather. Death had come to him at last.
'Farewell, my young master.'

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SebaCiel Oneshot - Itadakimasu
Hayran KurguAt long last, Ciel had gotten his sweet, sweet revenge on those who killed his family. Now Sebastian demands his payment...