Hullo so this is just an Idea for a Fan-fic. You see this was my dream last night and I woke up this morning and thought.
"HM that's pretty interesting." So ya know I'm writing this. It's Marina and Nico so NicoxO.C but Marina is just a normal daughter of Poseidon. She's not like the most Powerful Demigod Hope you like it! Please read and Review!

Summary. Nico di Angelo hasn't been to camp since the end of the giant war. Now an outcast. He's become bitterer and more hateful since. And it doesn't help that he spends every second of every day in the Underworld. Helping his father carry out plans. But now Hades has found out that Poseidon has a daughter and he sends Nico to go and get her. Nico doesn't know why but he's drawn to this girl. Whose name is as beautiful as her. Can Marina save Nico from himself? Or will he be another lost cause? (Full summary inside.)

Chapter 1

Nico di Angelo stood by the river Styx in the Underworld. He remembered when he brought Percy here to become invincible. Nico sighed. He hadn't been to camp since the end of the giant war. An outcast because he knew about both camp's and didn't tell anyone. So know he spent all of his days in the underworld, helping his father. And at the moment. He was waiting. Nico flashed back to that morning when he had received his task from his Father.

(Flash Back!)

Nico walked into the throne room wondering what he had to do this time. He bowed in front of his Father.

"Rise my son." Hades had said. Nico stood up and looked at Hades.

"What must I do Father?" Nico asked. Hades scowled.

"I have just found out that my Brother Poseidon has another child. A daughter." Nico snorted.

"He has a daughter? How old is she."

"Fourteen."

"Fourteen! But how was she not tracked by monsters?"

"Oh she was. She's just lucky. Now I can't have another little sea brat running around the place. So I've sent some of my skeleton warriors to bring her here. Alive. Go wait by the Styx and when she arriver's bring her to me."

"Yes lord." Nico said. And he left the Throne room.

(End of Flashback)

Nico was starting to get very board. And then he heard the scream.

It was definitely a girl. Nico stood up and waited while two Spartan's dragged a small girl towards Nico. Her arms were bound behind her back. There were scraps and bruises running up and down her body. She was wearing a torn T-Shirt with a faded picture that Nico couldn't make out. Her black jeans were ripped. And she had on a pair of brown leather boots. Her dusty Jet-black hair reached her waist where an empty scabbard hung. Then Nico saw her face. Pale and beautiful it looked almost like ivory with. Blood was trickling from the corner of her lip and her sea green eyes were wiled and full of fear. The skeletons dropped her in front of Nico and saluted.

Nico nodded at them and they disabled. The girl looked up at him. Nico thought that if looks could kill he'd definitely be pushing up the daisies.

"So your Poseidon's daughter hue?" She didn't answer him. Don't you talk?" Still nothing. He grabbed her arm and pulled her to her feet. "Whatever. Come on." He half carried half dragged the girl to the throne room. When he reached his father's place the two skeletal guards bowed to him. Chattering as they saw the girl. He pulled out his sword and pressed it against the girl's throat. He felt her shudder as the cold blade touched her skin. His father smiled.

"Well done my son." Hades said.

"Thank you father." Nico muttered. Hades' form shimmered and he shrunk down until he was the size of a regular human. He approached Nico and the girl.

He cupped his hand under her chin examining her face. She bit his hand. Hades' dark eye's filled with amusement her laughed and grabbed Nico's sword hitting her across the head with it the girl crumple to the ground.

"Nico take her to the dungeon. Then we'll see if she gets to live or not." Nico shivered. He bent down picked up his sword and sheathed it. Then he gathered the girls limp form in his arms and carried her towards the dungeon. Nico wasn't muscular by any stretch of the imagination. But this girl was extremely light. Nico winced. He could feel the girl's ribs through her shirt. He remembered after Bianca had died when he was living on the streets. He'd been Tired and hungry most of the time. Seemed this girl wasn't much better. He finally reached the cells and walked into one. He set the girl on the cot and was about to leave when he heard her say something. He turned his head. Her eyes weren't open so she must be dreaming. She was hugging herself muttering something about her brother. Wait did Percy know he had a sister? Nico found himself sitting next to her stroking her hair. Trying to comfort her. Just like Bianca used to do with him when he was having a bad dream. What the hell am I doing? Why am I still here? Nico wondered. The girl stirred.

"Leo?" She asked. Nico froze. But she continued to mumble Leo's name. How did she know Leo? Nico thought. True it could be a coincidence and this was a different Leo but there was no such thing as coincidences when you were a Demigod. He looked back at the girl and the emotion that played on her face hit Nico like a brick. Pain, grief, hurt, she looked lost. Just like how Nico always felt. He stood up and took off his Aviator jacket and covered the shivering girl with it. Then he walked out of the small cell knowing that he wouldn't be able to get that look on the girl's face, out of his head.