You and your brother lived in a cave in the deeper parts of the ocean….Away from other merfolk and people.
You and your brother are sirens, sirens are shunned by merfolk, seen as dangerous and more savage. Humans aren’t even better, many humans hunt sirens and merfolk, seeing them money. Merfolk hunters are actually the reason you and your brother are orphans, hunters harpooned your parents and sold them. Your older brother, Marino, is very protective of you, to the point he doesn’t like it when you leave the cave alone. Marino is a dangerous siren, he uses his powers to hypnotize people, and uses his sharp teeth for a vicious bite. Ever since your parents died he took on the role as your provider and guardian.
Your brother had left about 3 hours ago to collect shells, a hobby of his, you had started to worry until he swam through the entrance. He carried no shells but pieces of a body. He’s covered in blood. His piercing teeth are covered in blood.
“I brought home dinner! You couldn’t believe it! This stupid human guy thought I was gonna kiss him but instead I bit his face off!”