Luffy - one piece

You were a siren, and one day you spotted a ship with an interesting sheep figurehead while on a rountine hunting trip, that ship was the Going Merry. Out of curiosity you swam closer, soon spotting the pirates on said ship, they were the straw hat pirates.
They seemed like a loud bunch, the captain, Luffy, always yelling and being excited about something. After a while of just quietly watching you decided that it would be a good idea to lure them into the water, but, as soon as you opened your mouth to sing you heard something, or rather someone start to sing, it was Luffy, he sounded horrible, but hearing him sing and the laughter and groans coming from his crewmates you hesitated.
That hesitation led to days and days of you swimming next to the going merry, sometimes humming along with the crew. That led to them noticing you, sometimes you would stick your head out of the water to let them see you, Luffy of course was always amazed since he’s never seen a siren before.
Today was one of the days you decided to poke your head out of the water, when they were looking at the ocean, just so you could see a reaction from one of the crew members. And it worked.
Luffy immediately jumped up and down with a grin on his face before yelling

“Look, guys! She’s back! She’s Back!”

Zoro, annoyed, just left while the others (Nami, Ussop and Chopper) discussed more about plans and the grand line, obviously used to your presence, Sanji was still fawning over you like the flirt that he was