Second person POV:
"Liar" is all you could say in responce to the reaper. He told his tale of you and him, still holding you close.
"how does that explain how I was raised by the L/N? I was born from those cruel people, who used me for one of their experiments. You are just saying that to stall time"
He then started to hum, hum a familiar tune, that's when your core memory unlocked, "that tune", you said out loud.
Sebastian and Ciel could see in your eyes that you remembered the tune the silver haired reaper sung.
You started to hum with the reaper, matching the notes and finally ended.
You stood there shocked and paranoid, processing everything, still unclear what to come of all of the new information.
"Wait...so how did I really end up at the L/N?" You questioned, turning to look at the reapers green eyes.
While looking upon him, you couldn't help but think about how you fell in love with this man, you tried to remember, but you can't. He is a stranger right now.
"Once you turned into a baby, I had to find you a suitable home..." he started, looking softly at your face, "I first thought, find you a loving home that will treat you kindly, but then I realised..." he stopped.
He started to laugh a little, almost histerical but he controlled himself. Then he continued.
"If I left you to a loving home, your wings will sure turn white and pure. And if that happened, you would go back to heaven, and I may never see you again".
Your eyes widen, feeling a sharp moth start to form in your stomach.
Sebastian raised his voice and butted in, "so you left her with a family who could keep her wings from becoming pure".
The laughing reaper then continued, "Indeed I did, and not just any cruel family, this one was perfect, a cult who wanted to find what leaks in the shadows. They believed that animals hold the key to their awnser, that animals see things that humans can not. So why not turn a human into one, and learn from them?".
Your mind was out of control, you started to feel anger and sadness at once. Your eyes started to water, and as you regained your strength, you uses your power to knock him backwards, making him tumble but not fall, you looked towards him, cold and dead.
"So you dumped me in a living hell just so my wings don't turn white??!!" You said, you started to laugh but not in a good way.
"Your laugh is just as beautiful as always" the reaper said, walking towards you, "now let's see them wings of yours"
You didnt move, you were curious to what he meant . He then uses the tip of his scythe and poked your neck with it, making a small amount of blood to leak out.
As he did so, your six wings came shooting out, painless and effortless.
Sebastian and ciel watched as the scene unfolded being mesmerised by learning you are a fallen angel all along, but the ship started to shake.
"Your wings..." the reaper spoke again, voice dull and disgusted, "they have... black feathers in odd spots".
He was right, your wings were grey, but some parts showed black feathers forming out.
"You have been with that demon for too long..." guessing by your wings slowly turning black, you guessed that being around the demon Sebastian has caused this.
Undertaker looked back to ciel and the laying demon, "you even make ciel miserable" you could see him clench his boney scythe.
"I'll just have you disappear" he said, ready to lundge at the demon.

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Tail Coat And A Tail (Sebastian X Reader)
Fanfiction(Sebastian X fem reader) 18+ You were experimented and became a freak to society of the Victorian London. You lived among the poor and helped protect the weak and cold, as you had no other purpose in life. You are a hero to poor, but a thief and an...