Summary: Can you imagine how different things would be of Lily Evans née Potter had a sister who was also a witch? Now imagine Harry Potter having a twin sister, but they knew nothing about each other? Harry Potter was sent to live with Petunia and Vernon Dursley, but Corbett was sent to someone else, they were mean to her and abused her for ten years. Imagine Harry's and Corbett's surprise when they find out who they really are, and when they finally meet one another. Will the Boy Who Lived and the Girl Who Was Forgotten be able to kill Voldermort, or will he get the best of them?

Needless to say I OWN nothing of Harry Potter; all work goes to J.K Rowling. Some characters are OOC and yeah, enjoy!

Prologue:

October 31st 1981

"Aguamenti!" The dark haired witch hissed quietly. The spell she was trying earlier didn't quite work out, as it had set her skirt on fire.

"What are you trying to do now Claire?" A man asked gazing up from a book entitled 'Hunting Werewolves'.

She glanced at him and smiled slyly.

"Well Sev if you must know, I am practicing a new spell that I read about. It looks really cool, but I can't seem to get it right. Stop reading that book Sev, Remus is a werewolf you know, so I'm offended! " She said all in one breathe. It was amazing that her words didn't slur together.

"Oh Claire, love, give it a rest and come sit down with me." Severus Snape said smiling at his wife.

Sighing she set down her wand, and walked over to sit on his lap.

He set down the book and smirked at her. "You can't resist my good looks can you?"

She laughed, "Oh Sev, I love you so much, but you're not good looking."

He looked at her in mock offense. "I love you Clarissa Sophia Snape."

"I love you too Severus." She looked at him and smiled.

He scooped her up bridal style and marched to the bedroom.

They just got married the night before. It was a joyous occasion. It was held at Lily and James Potters' house in Godric Hollow.

It was a small ceremony really. Not that many people attended, hell not that many people knew about it. The only people who were there were Lily and James, their son Harry, and daughter Corbett, Albus Dumbledore (who performed the ceremony), Remus Lupin, Sirius Black, and Minerva McGonagall. It was a lovely occasion, and unknowingly the last they all would have together.

Flashback:

"Oh come off it Lily pad, I do not care for the last time." Claire said looking at herself in the mirror.

"Okay fine. If you want to get dressed in jeans and a plain white shirt, so mote it be. But I will fix your hair, and if it means twisting your arm to do it, I will." Lily threatened.

"Oh like hell you will Lily Pad." Claire said.

"Yep."

Before Claire could respond, Lily walked over to her sister and started tickling her.

"No, g-g get o-o-off. Help! This is- is- r- is- isn't fair! Help!" Claire screamed.

James, Remus, Sirius, and Minerva came running into the room, wands at the ready.

James and Remus were laughing at the scene before them. Lily was straddling Claire. Her arms were pinned on the ground, and she was squirming trying to get up.

"James. Remus, help, this isn't cool." Claire hissed still trying to get Lily off of her.

"I- I think, you should get off of Claire, least Severus think you are murdering his bride to be." Remus said in between fits of laughter.

"I only want to fix my baby sister's hair, since she insists on donning muggle clothing. Oh stop struggling chocolate Éclair." Lily said looking at the squirming ebony haired woman.

"Fine. Only if you promise to stop tickling me." Claire hissed breathlessly.

Lily got off of Claire, and fixed her hair, then went on to do her makeup.

"You only said hair, never said anything about makeup." Claire said panicking.

"Relax. You are driving me nuts." Remus said smirking at the display.

Claire turned and stuck her tongue out at Remus.

"Very mature." Sirius said laughing.

"Bite me Black." She retaliated.

"Would, but Snape has ya, but if the offer still stands." Sirius hinted.

"Ugh, you are such a dog." Claire said smiling.

"Don't forget it either, as long as you don't mind." Sirius said waggling his eyebrows.

"Would you like me to curse off your manhood?"Claire asked.

Remus, Lily, and Minerva both laughed as Sirius paled considerably.

"And do you Severus Tobias Snape Promise to love, hold, cherish and care for Claire as long as you both shall live?" Albus asked looking at the smiling groom.

"I do."

"And do you Clair

Clarissa Lilah Evans promise to love, hold, cherish, and care for Severus as long as you both shall live?"

"I do."

Albus raised his wand and began a simple bonding incantation. " I do hereby grant Claire and Severus, two lost souls who have found each other, a long and most deserving happiness, this incantation bonds you, not only as two people, but as one soul, one heart, one body, and one mind. I cannot think of any two people more deserving than the two of you. Now Severus, Claire, you are now husband and wife. Kiss your bride."

The room busted into applause.

"I would love to stay and celebrate, but I must go." Albus said, beaming at the two of them.

"Thank you for doing this Albus." Claire said hugging him.

"It was my pleasure dear. Now go celebrate with your family. This is a rare occasion in these times." Albus said, then took his leave.

Just then, Corbett started crying.

"I got her Lil." Claire said as Lily started to walk towards the crib.

Claire picked her up, but she cried even louder.

"I thought you had this Éclair." James said smirking.

Claire handed Corbett off to James.

Bad idea, seeing as how she screamed even louder.

They passed her around the room, tried giving her bottles, toys, anything. Nothing helped.

"What's wrong with her?" Minerva asked worried.

"Try giving her to Sev." Remus suggested.

Not seeing how that could hurt anything, Sirius gave her to Snape.

The moment she passed into his arms, she stopped.

"Look, she just wanted her uncle Sev." Lil said smirking.

"Why on Earth did you name her Corbett?" Sirius asked watching his god daughter getting rocked back and forth in the arms of his former enemy.

Minerva, Claire, and Lily rolled their eyes.

"As I have explained to everyone else. It was an original name, and not many people would willingly name their daughters that." Lily said with patience.

Severus chuckled. "I think it is a wonderful name. Even though it's more common for a muggle boy."

Claire walked over to the crib, and picked up a sleeping Harry. "I swear this kid could sleep through anything."

Lily and James chuckled. "Yes, he can. He reminds me of you Sev."

"Bring out the Fire whisky." Sirius said smiling at Severus and Claire.

"I never thought I would see the day that I would go to Severus's wedding, I would have never dreamed I would be calling you Severus." James said smiling.

"Things happen for a reason. People change, people grow up." Lily said smiling.

"Some people anyway." Claire said giving a pointed looked at Sirius.

"Remember Chocolate Éclair that offer still stands." Sirius said winking at her.

"Only if I get to join in." Remus said joking.

Snape growled. "My wife is off limits, touch her, and you will regret it highly."

The room filled with laughter.

James left the room to get some Fire whiskey.

"It's amazing how much Harry looks like James. And of course Corbett looks like you Lil, so stop looking at me like that." Minerva said smiling.

James came back with several glasses of fire whisky floating in front of him.

"I would like to propose a toast." James began. He raised the glass, and smiled while the other did the same.

"To family." He said looking at his brother and sister-in-law, holding his two children.

"To family." The room responded.

"I thought… you were…. going…. to keep them…. safe." Came they anguished whisper of Clarissa Snape.

She was sitting in Albus Dumbledore's office with tears streaking down her face.

"She and James put their faith in the wrong person," said Albus looking sadly at Claire. "Rather like you and Snape, I was hoping they would be safe." Came the grim words of the headmaster.

"What of little Corby and Harry?" Came Severus's quiet question.

"Harry lived, as did Corbett." Dumbledore said looking at Severus.

"Thank Salazar." Severus muttered quietly.

"Hagrid was able to get Harry out of the house before anyone could do anything."

"What about Corbett?" Claire asked worriedly. "You said they both were safe, but you said Hagrid was only able to get Harry out of the house."

"Ah, Corbett is missing." Albus said grimly.

"How, please Albus find my niece, I already lost Lil, I can't lose Corby as well." She said sadly.

"I will, I promise."

"Can we take Harry home?" Severus asked speaking again.

"I'm afraid that won't be possible." Albus said.

"Why the hell not, I am his aunt by blood, they are MY niece and nephew!" Claire stood up angry.

"Severus is still considered a death eater, even though we proved he wasn't. They can't stay with you." He said sadly.

"So where is Harry?" Severus asked and looked directly at Albus.

"I sent him to live with Petunia and Dursley with a note explaining it all."

"You sent Harry to live with HER! She is a horrible woman. I have seen how she lives Albus; she isn't fit to raise a witch or a wizard. She doesn't like our kind Albus, do you really think she will take care of Harry and Corbett, they are muggles, how in the hell could they possible keep them safe?" Snape fumed angrily.

"Harry will be safe; I can assure you of that." Albus said looking directly into Snape's eyes.

"I trust Tuney, I do not think she will let any harm come to either of them Sev." Claire said, taking his hand.

"I promise you I will find Corbett. Go home, I will send Fawkes your way the moment I get word" Albus said. With that he strolled into the fire place and left them alone.

Neither witch nor wizard left. Snape sank down onto a chair, and Claire sat on the floor by the chair. They sat in silence for a long time, waiting as the minutes passed into hours.

The sun shone into the office, yet the couple still did not move. Claire was asleep with her head in Snape's lap. He however was wide awake staring into the fireplace waiting. Wondering what had become of his little niece.

Finally after waiting for what seemed like an agonizing eternity, Dumbledore appeared.

Snape shook Claire awake. She sat up instantly.

"We found her." He spoke hoarsely.

"Where is she?" Claire asked.

"She is in London, with muggles. She was found on their doorstep and they took her in. She is safe; I also wrote them a note explaining everything."

Claire let out a breath and let the tears fall silently on her cheek.

Severus turned towards his wife and guided her into the fireplace. Never looking back as the tears fell from his eyes.

Chapter One:

Ten years later

Muggle London.

Corbett.

Corbett woke with a start wincing in pain. She had another nightmare; she remembered more of it this time.

There was green light, and a cruel voice laughing. This time she remembered the scream. It was a pleading scream. She always had that same dream.

Corbett quickly hopped out of bed, put on some clothes and scrambled to the kitchen. She had to have breakfast ready or they were going to be very angry. She always hated when they were angry. They would hit her hard and make her do more chores. That was something she wanted to avoid at all costs. She hated when they hit her, it was over the dumbest things too. Sometimes there was never really a reason why they did it. Corbett took out the skillet and started to cook.

Corbett looked nothing like her Aunt Sally, Uncle Greg, or Cousin Larry. To start it off they all had blond hair and blue eyes. They were all short and big boned, and she was tall and thin. Not thin enough to look like she was starving, but still pretty close. She had red curly frizzy hair and brown eyes. She also had a very peculiar lightning scar in the middle of her forehead and another one from the bottom of her left eye all the way to her cheek. They always called her a freak. Every time something weird happened around her, she would get blamed for it. For instance if a cup broke, she would get blamed for it. Not only that, but her chores would be doubled, and her Uncle would beat her. One day she was at school and Larry was picking on her, she got really angry and the next thing she knew, he was on the floor crying. Her uncle beat her for that, because Larry claimed she had hurt him. It wasn't her fault, he was picking on her, and she just wanted him to leave her alone.

"Mum, Corbett won't hurry up with breakfast!" Larry whined as loud as he could. Stomping into the kitchen huffing.

"It's almost ready Larry, calm down." She said quietly.

"Dad, Mum Corbett is being mean too, make her stop, it is my birthday you know." Larry whined again.

Sally and Greg walked into the kitchen. They were each carrying a handful of packages.

Sally was short, with thin blonde hair, and icy blue eyes. She was the type of woman who knew all the gossip, the kind who would sell out your secrets just to keep hers safe.

Greg was a short man with a very thick mustache. He too had blonde hair; his eyes however were a pale blue. He owned his own business; he was the type of guy who took more pleasure out of firing people than he did employing them. He was the type of scumbag who broke deals, and gave his workers very low pay. Suffice it to say people hated him.

"Corbett, you will stop being mean to your cousin, or you will regret it. Hurry up with breakfast as well; Larry's friends will be here soon." Greg hissed at Corbett.

They set the packages on the table and sat down in chairs. Greg sat by the table, Sally in front of the window.

Corbett bit her tongue and finished cooking breakfast. She set down the plates, careful as to not disturb the carefully wrapped packages.

Once they finished eating, Corbett collected the plates, and cleaned the kitchen. She listened to Larry open his presents and make comments on them.

"But Mum, why can't I get a new baseball bat. You know Corbett broke my last one." He whined.

Corbett's back was to them. She rolled her eyes at him. She did not break his Louisville slugger bat, he did, and he just loved blaming everything on her. It's because she wasn't the golden child. He was. What was she, a freak? Nothing more, nothing less.

"Oh all right dear, you can get a new bat." Sally finally caved in.

"Corbett you better keep your damn hands off of Larry's bat. If I find out that you touched it, the consequences will be dire." Greg hissed at her.

Fifteen minutes later, after Corbett finally finished cleaning the kitchen, she went into the living room.

Mike, Hans, and Larry were on the couch discussing the latest news about Mike Slemen.

"Oh look it's that freak, what in the hell is she doing here?" Mike whispered loudly.

Mike and Larry were sniggering quietly. Hans however was silent. He never laughed at her, nor did her ever make fun of her. But he never did anything to stop them either.

"Alright, let's go." Greg said finally appearing.

They all stood up to go. One by one they marched out the front door into the car. Greg was the last one to leave.

"Do NOT touch anything little girl, if I find out what you did, you will not like what happens. Do I make myself clear?" He hissed looking at her.

"Okay." She said back refusing to look in his eyes.

"Look at me!" Greg hissed. She refused.

He walked over to her lifted her chin and slapped her.

She hit the floor. Satisfied he walked out the door.

Corbett stayed there for a while before getting up and dragging her feet downstairs to her small little room.

Exhausted she slumped on the old mattress and slept.

Across the river in Little Whinging, a boy with bright green eyes awoke with a start to a throbbing pain in his head.

Hope you liked the first chapter/prologue. This is my first time writing a Harry Potter fan fiction. I'm not gonna lie, I am nervous about it. So please tell me what you think, leave a comment. Negative, or positive, I will take the criticism. Sorry for the lack of Harry in this chapter. I promise you shall see more of him in the next!