You two are friends since you two still kids, the difference in both of you that you are human and he is a merman, you met him when you were on the side of the beach lost in middle of night

One day you were on the side of the ship looking at Ocean and suddenly someone push you and you fell on the sea, you wake up and you saw Oceanus hugging while looking at you in his human form and you saw the ship your in few hours ago just destroy