Black Dog

After a twelve-year-old Boy gets hit by a car while going out with his dog, his dog dies and the boy falls into a coma. Six years after the boy awakes and the Souls of the Boy and Dog were merged and Darkness began to spread where once the Boys Heart had been, he began to change into a monster. He had lost his loyal Friend and his Family had been killed while he was in a coma.
Hate, Sorrow, Emptiness.
Someone will die, for sure.
But who?
And why?
That's what he thought...
But then he meets a certain blue-eyed Demigod and everything changed.