A/N: first story on this site, so yeah tell me if you like or not. Or if I made a mistake. Or just want to say something. Or any other reason. This is the introduction, so a test if people like it.

Disclaimer: I'm no male and I'm a teen from the lower lands aka the Netherlands so I don't own Percy Jackson and neither do I own Harry Potter. Now let me be sad that I don't.

A woman sat on the beach she was watching over the North Sea. She had beautiful brown hair and blue eyes that sparkle and change colour in the light. She was around the five months pregnant. She sat down on a rock, watching over the sea. She was waiting for her lover to come. She knew their time together would be short but she couldn't care less. The woman looked around her and when she didn't see anybody she pulled out a wooden stick and muttered something. A notebook and pencil appeared out of nowhere. She started writing.

Not a long time later a man walked out of the sea. "Sally, love."

"Poseidon," The woman, Sally, said and kissed him. When they parted she looked at him with a sad expression.

"What's wrong, my love?" The man, Poseidon, asked worried.

"I had a dream. I was told, in the dream, that our child will be the host of the essence of Selene. Our child will be Selene's successor, her chosen one. She's going to be in even more danger than being your child alone."

Poseidon looked worried, "I'll make sure the child won't die, I'll protect her with my powers."

Sally nodded, "I know you will, of course you do but the child will be powerful, more reasons for your brother's to kill."

"You know I won't let them do that," Poseidon reasoned. "I'm sorry, my love, I have to go. Zeus wants my audience." He gave her an apologetic smile.

"I know, go do your job, King of the Sea," She joked. He pecked her lips and with a flash Poseidon was gone.

She sighed and sat down on the rock again. She touched her stomach. "Hey there, dear child. You'll have a hard future. Three different worlds, two of them to be kept a secret, I'm sorry you have to live this life, I'm so sorry," She wiped away a tear. "You'll be a hero, my lovely child. And even if you fail, you'll always be my little hero." She knew it was going to be a dangerous time for her child, not alone in the world of her lover but also her world, where a dark wizard was on his way to kill. The one she knew too well, the one she hated with all her heart. But she also knew her child was going to become one of the biggest heroes ever lived. She just knew it, her child would be special. Selene's message only made it more visible.

She pulled out the wooden stick again and disappeared with a crack only to reappear in a small cabin not far away from the sea. She sat down at the table, parchment and a quill in front of her. She was planning to write a letter to her school friends. Even though they didn't had many classes together, they still became good friends. Sallina and Lily, always together, two of the smartest witches at school. She started writing her letter.

Dear Lily,

I miss you too, it's been so long since I've seen you. I heard you're pregnant, too. Even when we don't even know we do everything the same.

How is it in Godric's Hallow? It's horrible I can't visit you and James. With that excuse of a wizard walking around killing every decent person. If he finds out where I am I don't even want to know what he'll do. He knows he has a daughter, he knows my name. The thing he doesn't know is what I look like and I hope it'll stay that way. What would he do if he finds out I was in Ravenclaw instead of Slytherin. I'm almost sure he'd kill me, he's not really a loving person. I'll admit I'm scared.

My lover has a busy time, being called for his work every day. He works way too much but I can't do anything about it. I can't do anything about the rules of the higher power. He's glad he's having a child, too. A few months ago he was so excited when he felt the baby kick. It looked rather adorable.

I hope our children will be friends, once this is all over and Voldemort is gone I'll visit you so we talk together. I can't wait to see you and James again and hear everything you did and of course I'd love to see the Marauders too. Remus visited me a while ago, we had a fun time. Great stories which we didn't know about. I never laughed that hard in life.

I hope tp see you soon.

Your good friend,

Sallina

She walked towards a big cage and opened it, out of it came a big tawny owl. She put the letter in the owl's claws.

"Can you bring this to Lily, in Godric's Hallow?" She asked the owl and the owl hooted in response. She walked towards the window and opened it. The owl flew out, she stood there, looking out of the window until the owl was a little fleck in the sky. Then she yawned, put on some PJ's and went to sleep.