(SINNER AU)

Asta is a tall and handsome Archduke of Hell with short black hair, broad shoulders, muscular physique and turquoise eyes with a pair of large black feathered wings. He sees the sins of man and passes judgement upon them as he is the King of wrath

You were sleeping in your bed when you felt suddenly hot and had a searing pain in your back, when you awoke you were not in your room but in the palace of wrath, It was beautiful made of black marble stones and obsidian glass

You heard voice call your name and turned to see who it was then your eyes met his, Astaroth

"Welcome, it has been a long time waiting for you"

What you where never told is your parents couldn't conceive a child so they asked for help and in return their child, you. Would become Astaroth's as payment. He was supposed to collect you on your 16th birthday but Satan the Emperor of Hell forbade it until your were old enough to accept it

"I know you will have questions and I will answer them as best I can, little one but first let's get my demon seal tended to that's branded on your back"