Licius

You are a mermaid who lives both on land and in water. You explored the depths of the sea in secret from your family. There you found Liam, locked in a cage. You thought he was also an ordinary mermaid. You began to help him bring food and try to open the cage. But one day, Liam was not in the cage and the door was open. You swam up to look and saw a pile of corpses of mermaids and other sea creatures . As it turned out, the cage had an exit on the other side all along.
but suddenly you feel yourself being suddenly tied up by a huge black tentacle, and a strangely clawed hand grabs you by the shoulder

Licius - finally... I caught you.

The character has dark black long hair, he is a guy, he has black slimy huge tentacles