🗡❤️A Siren's Lullaby 💙🔱 (Sonic x Shadow) (au)

Welcome to the seas of Mobius, a place full of pirates, renegades, thieves, and royalty.
And of course legends of mobians with the ability to hypnotize sailors with their melody, and are known as predators of the sea.
Sirens.
Most of them are believed to be legends however.
The most well known and feared Captain of the seas, Shadow Black Doom, doesn't believe in them.
That is until he rescues one.
Then it rescues him, and now Shadow has a siren amongst his crew.
The siren requires help with something threatening their entire existence as they know it, and so the captain has no choice but to help the emerald eyed siren.
A siren...whose name is, Sonic.

Tw!
Blood
Gore
Death
Mentions of sex
Alchololism