Disclaimer: I do not own any Harry Potter Characters but I do own Annika.

Chapter 1

Annika Snape is not your everyday Snape. Of course her father is Severus Snape and she is in Slytherin but Snape's not her real dad. Annika is 15 years old and a 5th year at Hogwarts School of Witchcraft and Wizardry. She has black strait hair and green eyes. She has a lightening bolt-shaped scar on her arm. Yes, Annika is Harry Potter's twin sister.

When Voldemort attacked Harry's and Annika's parents gave their lives for their children. Voldemort couldn't kill Annika and Harry so they both have the scars. When Sirius found them he knew he would have to tell Dumbledore that Annika survived. When Dumbledore told him that it would be safer for them to split the twins up so Sirius asked if he could take Annika but Dumbledore denied him and sent her to a very reluctant Snape and Harry was never told he had a sister.

Annika's POV

Me living with Snape has been great he treats me like I was really his daughter. The past 5 years at Hogwarts has been really weird because Harry and I have all of our classes together. And of course I couldn't tell Harry that I was his sister.

I was sitting in Snape's living quarters and I was reading by the fire. I was rubbing my scar as it throbbed from the pain. The door opened and my father and the headmaster walked in. My dad saw me rubbing my scar and a look of concern crossed his face. "Annika are you alright?" he asked coming over.

"Yeah dad I'm fine it's just my scar. Harry's feeling it too I can tell."

"Yes Potter looked a little pained in my class."

"He and I both. Dumbledore how much longer do I have to sneak around and lie to my brother?" I asked putting my book down. My scar seared again and I winced.

"In time my child. Well I will go seeing as you two need to talk. Good night." And he left. My dad sat on the couch and waved me to come over. I got up and took a step before my scar exploded in pain. I fell to the ground and writhed on the floor.

"Annika!" In the distance I heard my father yell. I grabbed onto his robes and looked him in the eye.

"Go to Harry. See if he's alright." I moaned.

"I'm not leaving you."

"Dad it will stop if Harry's safe. Just go!" I said as another hot searing pain hit me. My father hesitated but left. I heard the door close and I heard someone step out of the fire.

"Annika!" the person yelled. I recognized the voice. It was Sirius.