Fused Instincts

Zeref clutched his younger brother in his arms, the boy completely limp in his older brothers hold. Igneel was lost for words as Zeref very carefully laid his younger brother down.
"Please," He asked, his voice cracking as it wavered, "Help him."
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Before the creation of Zeref's Etherious demons, he created something else. It was not a demon, no, it was his younger brother, Natsu. And using the scales, blood and tooth of the dragon that Natsu would soon call his father, he created something more than a demon. He created a hybrid. A half-dragon.
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A retelling of Fairy Tail with Natsu as a half dragon with vague memories of his traumatic childhood and who doesn't know how to act human after being raised as a dragon.
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I also posted this on AO3, so neither this nor that is a copy, thank you very much.