Mermaid infection

Things used to be simple between you and your friend, Aria. you Made Music, and she sung beautifully. But her Father, whom you never met, is the God of the seas himself, Posiedon. and he was not thrilled with her falling for a land dweller. but he knew how angry she would be if he got in the way. so he did something unexpected. with a classic case of the "screw it's", he cast a magical tsunami over the world, sinking everything, and turning everyone into merfolk of every species, including you.