Disclaimer! I own none of Vocaloid, nor any of its characters. They belong to they're respected owners.

A/N: Hello my muffins! *hugs you all tightly* This is the start of Compass Rose, a Pirate!Yuuma x Siren!Piko fan fiction! Let me first explain what a siren is (or at least the way I'm using them). Sirens are a lot like Mermaids (and Mermen of course) but the greatest difference is that when a Siren goes on land they can take the form of a human. Sirens attract sailors to them with their beautiful voices before killing them. Usually the way of killing them is that the sailor will follow the voice, thus throwing themselves into the ocean to drown. I'm using this. HOWEVER. Piko (along with any other siren in this story) has the ability to kill through song alone. But it's not just song that has the effect; it's any usage of his voice. Screaming, humming, crying, moaning; they all have different effects. I think that's all that I need to tell you right now. I promise my Author's Notes aren't always this long, just the first chapter or so. Alright, here goes! Enjoy!

*Compass Rose*

*Prologue Part 1*

"This island looks deserted…" A few of Yuuma's crewmates nod in agreement while others voice their opinions out loud. "Leave no stone unturned!" and with that, the pirate crew set out in search of the riches that were rumored to be on this tiny island.

The pirate captain himself sat perched on the wooden edge of his ship, watching foamy waves slap against the sand. It was then that Yuuma saw something shine beneath the white layer of salty film being left by the water. It was rather large and shimmering gold; Yuuma, of course, had to take a closer look.

Lifting the object into the air, the pink-haired man found it to be a heart-shaped locket, about the size of his own eye, attached to a long gold chain. The two pictures inside the heart had long since withered away. He pocketed the item and was about to return to his ship when a shape in the wet sand caught his attention. All of his men wore shoes, so the sight of a trail of footprints meant only one thing; they weren't alone.

Sword in hand, Yuuma followed the prints, assuming this person must know something about the treasures. They were rather small and the person who left the path seemed to have walked intoed. As he followed the trail around what looked like a boulder, he came to discover that the opposite side was entirely hollow.

Littering the sandy ground were countless valuables. Millions of necklaces, all spread out neatly; varying in lengths and sizes and sorted accordingly. Glittering like strings of holiday lights were dozens upon dozens of vines, each with its own share of rings; making a silver and gold canopy dangling from the top of the cave. A large collection of colorful stones; some recognizable as diamonds, topaz, and various quartz; was balanced on crevices in the stone that served as make-shift shelves. There was also an assortment of silver utensils and pieces of stained glass, as well as a few vanity items.

And sitting in the middle of it all was a person whose body was hidden by long- yes, very long- white hair. In the kid's hand was a porcelain-framed mirror in which Captain Yuuma could see one green and one blue eye widen in terror.

He stood in a hurry and spun to face the pirate. Yuuma could see that the boy was also quite decorated. Around his waist he'd wrapped a white and gold fabric that might've been part of a wedding dress in the past. His long, teased fringe supported a diamond studded hair clip and his right wrist was hidden by a golden cuff. He wore more jewelry but Yuuma couldn't catch a good look at it as he darted toward the ocean.

He quickly chased after the kid, who ran with surprising speed. He ran straight for the large rocks bordering the island. With his boots giving him a slight advantage over the bare-footed kid, Yuuma scaled the rocks with ease.

So it quickly came down to a standoff. Nearing the ledge of a cliff was the white-haired boy, trembling and taking a small step back for each step the pirate captain took closer to him. On the safer end was Yuuma, whose sword had been sheathed. He stood with his hands up at each side of his head, trying to negotiate with the kid who was clearly skilled in finding lost riches. If only he could trick the kid into boarding his ship; from there he could lock the albino away as a captive and use him to his advantage.

"Kid! You're going to die if you keep that up, so just come over here!"
I can survive it.
"
I only want your help; I won't hurt you!"
If I go with him, he'll find out. He'll hold me captive.
"I'm unarmed! I've laid down my sword!"
There's a gun in his coat. If I turn to run, he'll shoot.
"I just need you to accompany me,"
I just need a chance to jump,
"Now come on!"
"GO AWAY!" Their demands were shouted in unison; though the victim's voice rang out at a deafening volume. Yuuma, his crew, and anyone else in hearing range of the boy's shouting fell to their knees and protected their ears from the sound that confused the ocean's waves and shook the very land they stood on.

Yuuma gathered his senses as the cliff he was standing on split. The white-haired boy fell, along with the entire half of the rock he had been standing on. But much to Yuuma's surprise, he uses the clay stage as a launch pad; running the full length of it before leaping off the edge and diving flawlessly into the water.

"No human can survive that!" He exclaimed, unable to believe what he had just seen. Despite the odds, the boy breaks the surface; cheering as he sees the damage he caused and the escape he made.

"Not today!" The boy shouted. "Try harder next time, you pathetic pirates! It takes more than one amateur human to capture a siren, ya know!" And with that the boy dove under once again, the end of his black tail throwing water into the air before disappearing into the waves as well.

*Compass Rose*

*Prologue Part 2*

"What is this!?"

"Get it up here! Faster! You don't want it screaming again!"

"PARLEY! I CALL PARLEY!"

"We hear ya, brat."
"Don't worry yourself, Cap'n Yuuma wanted to meet'cha anyway."

"UNHAND ME, YOU DIRTY- MMPH!"

"Out of my way, men."
"Is this him, Sir?"
"Indeed, it is. This is our key to all the riches you can imagine, boys!... You. Look at you. Who's the pathetic one now, kid? Ha! Don't even try that! One unpermitted peep from you and you'll be tasting bullets. Now, what's your name?"

"…. Piko."

"Well, Piko, welcome aboard the Compass Rose."