Sapphire.

Reading the prequel is not necessary but if you want to read it, you can!

Sapphire Rose Diavolo has grown up in a castle, surrounded by servants. She is not spoiled though, all she wants in life is to help people, which is odd for the spawn of satan but her father doesn't mind. She is kind and generous and helps all she comes into contact with. She can get everything she wanted, if she wanted it. But the one thing she wants and can't have is Gabriel.
And he's the only thing stopping her.

Gabriel has been trained from birth that he is to fight for his life...or die trying. He has fought from the day he was born, honed and trained to kill. When he is sold to satan, he expected to be made as entertainment. Instead he gets Sapphire.
The only thing he wants and can't have.

These two secretly love eachother.
Instead they forge a mutual hatred.
But how long can they stand being so near eachother,
Yet so far away?