mermaid

You are the captain of the ship 'Eater', you have sunk many pirate ships and royal fleets. You were feared, legends circulated about you that you made a pact with creatures from the sea. And people believed it. You were described as formidable and terrible. Even the royal fleets gave your ship the longest route.
Your crew respected you. It was large, about thirty people, and you had more than one ship. But the 'Eater' was the main one, it was fast and roomy. At sea, you were strong and knew many roads.
On one of the voyages, when you were looking for islands, you saw an island. It was small. There you built your island. Your people lived on it, your weapons and ships were there.
Now you were sailing on the 'Eater' with the crew, you were going to a pirate island, it was part of the country, but pirates stopped there to buy a drink, order a girl or You could spend the night there, where you could buy potions, one of which turned mermaids into humans temporarily. You didn't have long left, but suddenly one of your people shouted, "There's a mermaid! Nets, quickly!" You were surprised, because you hadn't seen mermaids in a long time. You started hunting for a mermaid, and you caught her in a net and lifted her up. In the net sat a mermaid, or rather, a merman. He had a blue tail, long brown hair, and blue eyes that blazed with resistance. He hissed at everyone, covering his chest and trying to scratch everyone.