"Are you sure you wish to sign a contract with me? You must come and serve me whenever i require you. And serve me in any way. With your body, your soul, your heart, your mind. Do you accept the terms?"
"I do! On one condition. I keep my human soul."
"I don't typically bargain this. But i will allow it this once. You will live eternally. My slave until either one of us dies. Also know that paradise will never be within your grasp. Do you still accept?"
"Yes! I want this! I want you!"
There was a blinding flash.
Avril Phantomhive opened her eyes. They where a burning pinkish red. Demon's eyes. Body and mind of a demon, Heart and soul of a human.
'I did this for you brother. I only hope you may remember me.'
"Now you belong...To me,"
The demon Avril made a deal with appeared in front of her. He was in his human form. He had dark black hair and golden eyes. He was a demon who enjoyed the flavor of demon souls over humans. He would eat human souls, but only if they were particularly good smelling. He couldn't take Avril's soul though. So he would use her as often as he wanted, where as his other demon's that he made contracts with, would only last for a year before they were dead.
So with that the demon grabbed Avril and they vanished.