It was a rainy afternoon at 12 Grimmauld Place. Harry and Ron were sitting on the floor of Sirius' old room, Hermione was putting Teddy to sleep in the next room. Harry had found boxes in the back of the closet filled with parchments and photographs. Upon further investigation, he found them to be of his parents' school days. He and Ron were going through the items, remarking on this and that detail.

"Blimey, Harry, look at this."

Ron held up a stack of photographs he had pulled out a the box. The top picture showed a young Sirius, no older than seventeen, with his arm around a pale girl with dark brown, almost black hair. They were laughing and smiling and looked absolutely enamoured with each other. Written on the back was: Sirius and Rosemary, Seventh year

"Rosemary? I've never heard of a Rosemary before. Sirius never mentioned her. Ron, where'd you find this?"

"Over here in this box. She's in more pictures too."

Harry handed the picture back to Ron and began shuffling through the box he had found the photograph in.

"Look, theres another one of her, with Remus. Curious, they look very much alike. You think they're related?"

"Maybe. What's this?"

Ron had begun digging through the box again and pulled out a stack of parchment tied together with thick black ribbon. He pulled the top one off and handed it to Harry.

My Dearest Sirius,

I do hope this finds you well. And words cannot express how I miss you. Life is quite boring without you boys causing havoc. Remus, of course is no fun on his own. Speaking of, I think it'd be a good idea for you and James to come visit Remus. He's just so down lately. I know he blames himself for not being home when...it happened. Can't say I don't feel the same. But he's been so gloomy since we returned home from school, he doesn't have you boys as a distraction anymore. I know I say this all the time but I do truly believe that you and James were the best thing to ever happen to him. You know I'd do anything for him, I just wish he'd see that this wasn't his fault. I hope seeing you will cheer him up. Perhaps Lily can come too? I would love to see her, its been so long since I've had some girl time. Not that I wouldn't be thrilled to see you either. Please come, I miss you.

Give my best to Lily and the Potters

And of course all my love to you,

Rosemary

"Sounds like this Rosemary girl and Sirius were very close."

"Yeah, and I think she must have been Remus' sister or something. He ever mention anything to you about having a sister, Harry?"

"Nope, not once. This is interesting though. Very interesting. Let's see what Hermione thinks."

"I'll call her. HERMIONE! HERMIONE CAN YOU COME IN..."

"Honestly Ronald, is it necessary to scream for me like I'm across the Black Lake. I was only in the next room, and you almost woke up Teddy. You're lucky I'm quick at silencing spells, or I'd have to put him back to sleep all over again."

"Sorry Mione. But look at what I found. Its a girl named Rosemary, and theres pictures of her with Remus and Sirius, and she looks just like Remus. And according to this letter, she was friends with Harry's mum. Who do you think she is?"

"I don't know. She's very pretty. Harry, neither of them ever mentioned her? She looks very familiar, like I've seen her before."

"Nope, and you probably think she's familiar because she looks just like Remus. Ron reckons she must be his sister or something."

"No, I definately have seen her somewhere before. Her eyes are unmistakable, they're violet!"

"Wait, I know where I've seen her before."

Harry suddenly got up and bounded out of the room. Hermione looked at Ron puzzled as they heard him loudly run down the stairs and then fly back up again.

"Here it is! Look, there she is! Between Sirius and Remus."

Harry showed them the picture of the original Order fo the Pheonix, from the first Wizarding War. Rosemary was standing between the two Marauders, smiling. Every few minutes she would nudge Remus with her elbow and then grab Sirius' hand.

Hermione took the photograph and studied it for a few moments.

"Ron, if she was in the Order of the Pheonix, your parents might know her."

"That's brilliant Hermione! When Teddy wakes up we'll just head over to Rons and ask his mum!"

The three friends arrived at the Burrow with Teddy about two hours later. Hermione hands the giggling boy over to Ginny, who after pecking Harry on the cheek takes Teddy outside to play in the yard with George. The Golden Trio wandered into the kitchen where Mrs. Weasley was baking. She took a tray out of the oven and placed it on the counter to cool. After wiping her hands on her apron, she sat down at the kitchen table with the three.

"You three look like you're up to something. What is it and whose in trouble?"

"No, no one's in trouble Mrs. Weasley. The boys found a picture of someone and weren't sure who it was. So we figured we'd ask you."

Hermione looked at Harry pointedly, nodding her head to indicate that he should show Mrs. Weasley the photos.

"Well, see this is a photograph of Sirius. And theres a girl in it, and we've never seen her before. And there's another photograph of Remus with the girl. And she strangly looks just like him. And then we saw her in the picture of the original Order. And we were hoping you could tell us who she was. I think her name's Rosemary..."

Harry looked up at Mrs. Weasley, whose features had become gloomy.

"Oh dearies. Rosemary, dear Rosemary. I haven't heard that name in a long time. She was in the Order, the first one. Along with your parents Harry, and Sirius and Remus. They were all very close. Oh that poor girl..."

Mrs. Weasley looked visibly upset at the mention of the name. Harry, Rod and Hermione looked at a loss. The four of them sat there in silence until Hermione decided to say something.

"Mrs. Weasley, who was she?"

"Children, I think that that's something that Rosemary needs to tell you for herself."

"But Mum, how? None of us have ever met her, do we even know where she is?"

"I can tell you where to find her. But not now. Now, have some pie."

An hour later, after returning Teddy to Andromeda's, Harry was sitting in a chair in the sitting room of 12 Grimmauld Place. At exactly 9 pm, Ron and Hermione stepped out of the floo.

"Ready to do this? Mrs. Weasley said she should be fairly cooperative."

"Yes, come on boys. Lets go see who this Rosemary character is."

They walked up the stairs to the second floor, traveling down the hall until they found what they were looking for. They entered a small room at the end of the hall, where an old fireplace sat unused. There was a lone armchair facing, not the fireplace, but the wall. But the wall was not bare. On the wall was a painting of a young woman with dark hair and violet eyes. They walked up to the painting, whose subject was currently reading a book.

They stood a few feet away from the wall, staring at the painting. The girl in the frame was the spitting image of Remus, with darker hair and more feminine features. And of course, the eyes. Harry took a deep breath and a step forward.

"Excuse me, Rosemary?"

The girl in the picture jumped minutely, surprised to hear her name after so long of silence. She looked at Harry puzzled.

"James?"

There was silence in the room. Hermione looked back and forth between Harry and the painting on the wall and decided to speak up.

"Hello, er, Rosemary. I'm Hermione Granger, and this is Ron Weasley and Harry Potter. Harry is James' son, James and Lily's son."

"Harry? Is that really you, all grown up! I knew you were older but, Merlin you look like your father. Oh I remember when Lily first had you, you were such a cute little tyke."

Confusion spread across Harry's face. Rosemary had known him when he was a baby? How close had she been with his parents? And why had he never heard of her before.

"Rosemary, Mrs. Weasley said that we should ask you about your, er, history. With my parents. And Sirius and Remus. I guess you were very close to them."

A look of sadness crossed her face at the mention of the two Marauders.

"Yes. Yes I was. Remus was my twin brother, and Sirius. Well, I loved him."

"Remus' twin? And you loved Sirius? Sirius was my godfather, why have I never heard about you before?"

"I'm sorry, Harry. I can understand why they don't talk about me. They have told me all about you though. But if you'd like to know my story, I don't have a problem telling it."

Harry nodded. He conjured two more arm chairs and set them before the portrait. Harry, Ron and Hermione each sat in a chair and looked expectantly.

"Well, I guess I should start at the beginning. My name is Rosemary Lupin. I am the twin sister of Remus Lupin. No, I am not a werewolf. But I almost was one. When we were five years old, Remus and I were playing in the yard on the full moon. It was a clear summer night. My parents were in the house, cleaning up after dinner. Remus had just run back inside, for not even a moment. I never heard him coming. I never saw him coming.

" I was his intended target. They always said that Greyback liked young girls. But as soon as I realized he was behind me, Remus ran in front of me. Greyback never touched me. As soon as he started attacking Remus, I started screaming. My parents were in the yard seconds later. But it was too late. Remus had already been bitten. We spent the next week in St. Mungo's. Mum cried for a week.

"But it was something we learned to live with. At first, I didn't understand why Remus couldn't play with me for a few days a month. But when I was older, my parents explained it to me. When we were starting Hogwarts, my dad took me aside. He told me that people there wouldn't know about Remus. And that they shouldn't find out, because some people would be prejudice against him. I couldn't see how, even with his condition, anyone could be prejudiced against my brother, but I promised I'd take care of him.

"I took care of Remus throughout Hogwarts. I made sure that every full moon he went to the Shrieking Shack. I covered for him with his friends, I made sure I got all his homework. I owed him my life, it was the least I could do. Remus and I were veriy close, we told each other pretty much everything. We had a bond, you could say. I think it came with being twins. I could tell when he was in trouble and could go to his aid. I think its how he knew I was in trouble that night."

Rosemary paused and looked at the three Gryffindors in front of her, giving them a chance to ask questions. It was Harry who spoke.

"So you and Remus were twins. I'm assuming you were in his year. And I know that you knew my mum...Were you in Gryffindor?"

"Yes, I was a Gryffindor. Just like Remus, just like your parents. Just like Sirius. Lily and I were best friends. I knew them all very well. "

"So you knew, the Marauders?"

"Wow, thats a name I haven't heard in ages. Yes, Hermione. I knew the Marauders. Lily and I were the only two girls they ever let into their little circle. I don't think anyone else would have wanted to though. Actually, come to think of it, the Marauders were really created because of me. I brought the boys together, as strange as it sounds. And I introduced Lily to James."

"What! You're the reason my parents met? How? Please tell us!"

"Okay Harry, settle down. And yes I will tell you. Everything But get comfortable, its a bit of a long story. "