Disclaimer/ Anything you recognise is owned by JKR. Only OC and part of the plot is mine

The night the Potters were killed by Lord Voldemort, Albus Dumbledore and Minerva McGonagall gave not one, but two children to the Dursleys. Young Harry Potter, the Dursleys nephew, and one-year-old Isobel. The Dursleys believed the girl to be the boys twin sister (being unaware of the circumstances of the Potters) as they shared black hair and green eyes. If they had looked closer however, they would have noticed that Isobel had no other traits of the Potters, and even her hair and eyes were different shades to Harry's. The Dursleys however were unobservant, so the two grew up believing themselves to be brother and sister. A strong compulsion charm also helped with the lie. On July 31, the children's eleventh birthday, Rubeus Hagrid came with Hogwarts letters for both of them, taking them both to Diagon Alley, Isobel buying herself an Ash wand with unicorn hair, 12 inches and a ginger tabby cat she named Amber. Come September 1, herself and Harry were brought to Kings Cross Station by the Dursleys and were left alone to find the way.

"Where do you suppose we go know?" Isobel asked her brother.

He shrugged, not having any idea. They wandered around looking for help, but it wasn't until a family of six rushed past them saying something about muggles that they knew what to do. They raced after the family. They watched as three of the children seemed to disappear through the barrier. They met Mrs Weasley who explained how to get through the barrier. Isobel watched as her brother ran towards the barrier, then disappeared. Taking a deep breath, she then did the same, and seconds later, she appeared on Platform 9 ¾ . Harry and Isobel made their way onto their train, meeting Ron, Neville and Hermione. The train ride took place, and Isobel rode in the boat with Ron and Harry, Seamus taking another. Hagrid lead them up to the castle doors and knocked on them three times. The door swung open at once. A tall, black-haired witch in emerald-green robes stood there. She had a very stern face, one that almost looked familiar.

They followed Professor McGonagall into the hall. She told them about the Houses then went to see if the school was ready for the students. Professor McGonagall's eyes lingered on Isobel, and her face changed to one of almost shock. Then it was gone, and so was she. Harry asked how they were sorted, and Ron answered with something about fighting a troll. Isobel wasn't really listening though, as her thoughts were on Professor McGonagall. Isobel was sure she knew the witch from somewhere, but she could not place it, for where on Earth would she know her from? She barely noticed when the ghosts came past, although she did shiver a little when one brushed past her. When Professor McGonagall returned, she ordered them into a line, following her into the Great Hall. She silently placed a four-legged stool in front of the first years. On top of the stool she put a pointed wizard's hat. This hat was patched and frayed and extremely dirty. Aunt Petunia wouldn't have let it in the house. Isobel vaguely wondered what that were going to do with it, when all of a sudden it burst into a song. When it finished, the first years seemed to breathe a sigh of relief. All they had to do was try the hat on. Professor McGonagall now stepped forward holding a long roll of parchment. She started calling names, and one by one students were placed in their houses. When Harry was called, whispers broke out over the hall. A little while passed before the Sorting Hat shouted out "GRYFFINDOR!" and Harry joined the Gryffindor table, Isobel clapping wildly. Then Professor McGonagall called

"Potter, Isobel!"

The hall grew silent as they watched her eagerly. Isobel gingerly stepped forward, glancing up at Professor McGonagall, who was giving her a strange look. Then the hat was draped over her eyes, and a little voice spoke in her ear.

"Hmm, interesting. Very interesting. A good mind, I see. Lots of courage as well. A desire to prove yourself, and… ah, yes, an unusual amount of kindness. The question is, where to put you?" The voice went silent for a little while. All the students and staff looked on quietly. Every now and then the voice would make a little noise – "Hmm", "Aha", 'No", but it didn't speak anymore. Three minutes passed. Then suddenly, the voice spoke up again. "For the first time, I do not know where to place you. Your qualities and traits accept all the houses, yet none accept you. I am not sure what to do." At this, Isobel grew very worried. What was going to happen? Were they going to expel her from Hogwarts before even the first day? The Hat began to quiver, then it grew very still. Too still.

Dumbledore POV

When Minerva calls out the young Potters name, I lean forward and watch the hat closely. I catch Minerva's eye, and see the worry in them. I give her a questioning look. She looks away, towards the girl on the seat, but I feel a buzzing in my mind. I have a strange feeling about this Albus. It's Minerva, talking to me through our minds. We have communicated like this for years, so it doesn't surprise me. How do you mean Min? I ask her. She does a sort of mental sigh. When I first saw Miss Potter, it seemed to trigger a memory, but I couldn't access it. The memory has been blocked. I try to keep my face neutral, in case anyone happens to be looking my way. No one knows of Minerva and I's relationship, and we hope to keep it that way for much longer. But her statement confuses me. Surely, she would know if her mind had been tampered with. I know she's too powerful not to. What do you think can go wrong? I ask her. She's only getting sorted. Minerva doesn't send me a message back; I only feel uncertainty in her. It's now that I realise a long time has passed since the hat was placed on Miss Potter's head. Around three minutes. Not uncommon, but I start to get the same feeling as Min. Something isn't right. Just then I feel an unfamiliar invasion in my mind. I am about to shut whoever it is out, but then I hear a voice. Professor Dumbledore, it is the Sorting Hat. This time I can't completely hide my shock, but I quickly recover. My apologies, I did not realise. What is it that you need? I glance at Miss Potter, and see the Hat is still on her head, however it has stopped moving. I'm not sure what's wrong, as the Hat has never spoken to me during the Sorting. For the first time, I cannot place this student, I hear the Hat tell me. I frown. Why not? I ask it. It's right, this have never happened. The child possesses a strong personality. Very unique, and unable to be restrained. Her traits accept all the houses, yet none of them accept her, for she possesses the traits of the others too strongly. Thoughts and ideas run through my mind as I realise what the Hat is asking. I am almost too stunned to respond. I decide that Minerva should be apart of this decision, so I open my conversation with the Hat to her. I quickly fill her in, then ask, Minerva, what shall we do? I see a small frown cross her face, unnoticeable to anyone but me, as I know her too well. I think there's only one thing we can do Albus. Place her in all four houses. I feel the Hat waiting for confirmation, but I don't answer straight away. By now, at least seven minutes have passed since the Hat was placed on Miss Potter's head. I turn over the idea in my head. Would it work, for her to be in all the houses? Where would she sleep, and who would she take classes with? Then I decided to do something I had never done before. I went into the girl's mind.

Isobel's POV

The Hat had been still for over five minutes now. I could faintly here students murmuring, but they were still waiting for me to be sorted. I didn't know what was taking the Hat so long, but I was starting to get impatient. How long could it take to decide to expel me for not fitting in? Then a new thought hit me. What if they were going to do something worse to me. Was there a prison for wizards? Could children be sent to it? Hundreds of dark thoughts circled through my mind, each one worse than the ones before it. Finally, I feel the Hat start to move again, but it still doesn't speak. I want to yell at it to hurry up, but I resist the urge. I start to feel a small buzzing in my head, but I ignore it. When the Hat speaks again, at least ten minutes have passed, I'm sure. However, the word it speaks is completely unexpected.

"GRAVLEPIN!"

Hey guys, this is my first story so please don't judge. Also sorry for the short chapter, but this story will be continued, and chapters will get longer. Thank you so much for reading