My older brother caught a mermaid while out at sea. They kept him in a bathtub and gnawed on his flesh.
My brother treated me as a child bride. When he tried to take liberties with me, I fought back with all my might, but my parents beat me nearly to death.
As I lay dying, the mermaid saved me with his flesh. He said he'd seen me before and saved me once already. He'd saved me twice.
"I saved you, so you have to repay me."
"Fine. Everyone in the village will pay the price."