The Siren's Song

Bill Cipher was the most mysterious pirate that sailed the seas. No one know his past. No one knew where he came from, he had just arrived one day. He knew the sea better then any other pirate. Every nook, every crany. He knew it all. But yet he longed for something that had been taken from him.
Dipper was a siren. Not a normal one. He was an outcast at his home. An orphaned siren was about as good as a cup to the other sirens. Dipper only had one thing from his parents, a singing voice that could drive even a siren to insanity. Which is why he never sang around anyone. Never.