kissing The Devil

How can an Angel like Lucy fall for the devil? How can a devil like Natsu have a soft spot for an angel like Lucy?
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Natsu Dragneel is the richest man in the world. He owns a company and is a rruthless, cold-hearted Mafia leader. Lucy Heartfilia has nothing to do with the mafia. But she does however work for Natsu. She is his personal assistant. Lucy doesn't have any interest in Natsu, or that's what she thinks. She thinks that because her mother told her. But in reality she falls deeper for him everyday that she sees him. She denies her love for him so much that she can't even see that she is in love with him. Natsu also starts falling for Lucy, but has no time to notice because he's always so busy. Natsu has to go on a business trip, and he starts miss lucy. And it doesn't help that Lucy has a dream about Natsu either.