My Life As Satan's Son

Before Lucas was born, his mother was terminally ill, dying from cancer. Her husband fought to keep the doctors on her case, ensuring that she would get better if they kept at it, they had to keep at it, right? But, his mother, Mary, was accepting her fate as it was delt. She was going to die, and nothing could save her, so she thought. On one calm night, a man entered their home, offering them the deal of a life time. He would cure Mary, worry free, but, she had to bare his son.

And that son, on his 18th birthday, would be taken back into hell, to train to be the man he should be.
The actual Prince of Darkness.
To be the future holder of the throne.
To be King Lucifer.