Story of Black dragon's child

This is my first fanfiction. The story of Natsu Souleater, son of Acnologia. "Yes, it is the truth. I killed many. 'But why' you must ask yourself. I was forced to do that so many times until I started to enjoy it. But you know what else is true? You killed as well. Did someone force you to do that? I think the answer is 'no'" dark/Natsu but not evil, stronger/Natsu, smarter/Natsu