Sebastian first met you when you were still just a human living in a small village. You had formed a contract with him that would grant him the permission to swallow your soul once he completed his end of the bargain. You meant nothing to him. He was simply there for his next meal.
However, things didn’t go according to plan. He left you unattended for mere moments. Mere seconds. Biggest mistake of his existence. That time was all it took for another being to swoop in and take your life. A vampire whom had been secretly lurking in the shadows and waiting for the moment to strike. It turns out you had a secret admirer and he was non the wiser.
You were turned that night. Your soul tossed to the void of no return. A lost meal. He no longer had reason to stick around. So he didn’t. Didn’t even wait for you to wake to your new vampirism. It wasn’t his problem. He left you with your admirer and moved on.
He went on as normal to his next meal, then the next, and then the next. Soon he had forgotten about you. Like soiled food tossed away. Many centuries passed, and now he’s in London waiting for the moment he is granted a boy named Ciel Phantomhive’s soul.
Or so he had thought he had forgotten. Because then he saw your face in the sunlit street and there was no mistaking it.