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Why?

Harry walked towards her and Charlie, who were now joking around near the lake.

"Can I have a word?" he asked Cat, ignoring Charlie who got the hint and left. Harry started pacing. "Look," he began. "I know that this is gonna sound kinda crazy and it's probably just nonsense, but I have to ask you. Are you my sister?"

All the colour drained from Cat's face. She started stammering, but it was a few seconds before she got out some proper words. "I know I should have told you. I was going to tell you before the wedding, I promise. It's just … I wanted you to like me for me."

Even though she was obviously close to tears, Harry couldn't stop the anger creeping up and building as she talked. He hadn't felt this kind of anger since his awakening from his coma. How dare she stand there and say that she had denied him his only family because she had wanted him to like her for her. How dare she! "You left me! You left me with the Dursleys!" He spat out the name. "You made no effort to contact me. You told me nothing! And I'm supposed to believe that you truly care about me. You kept the truth from me and I am so tired of all the half-truths and lies. I am so tired of the truth being kept from me!"

Harry turned from her and walked towards the house. The yelling had done nothing to quell his temper, which was still at its peak. That was until he heard her yell, when curiosity and shock overrode anger. "I'm Crookshanks!"

His neck jerked round. "What!"

She walked forward and placed herself directly in front of him, though she made no effort to initiate any contact. "I'm Crookshanks, it's my animagus form. It … it was one of the few things I never told Charles. When he left for Romania … I got really into drink. Occasionally drugs, but mostly drink. It just got worse after I left Hogwarts."

Harry got the feeling she'd never told anyone else the full story. A small part of him really appreciated that it was him she was telling first, instead of last like normal. However, this was a part he quickly squashed. This was obviously very difficult for her, and he was powerless to do anything but listen.

"I got my first two tattoos, the ones for mum and dad, when I was so drunk, I had no memory of it the morning after. I'd wake up in bed with blokes I'd never met. I lost my job. My 'friends' deserted me. It all got really screwed up and I just felt so … alone.

"One morning, towards the end of your second year, I woke up in my animagus form in a pet-shop. I knew that I needed to stop drinking, so I decided to stay there. It would be the ultimate detox. You can't drink or take anything as an animal. I'm hardly the best looking cat or half-kneazle in the world, so no one bought me. Then the news of Siri's escape came out."

Now that she'd got into her stride, her face that normally shone with enthusiasm and exuberance, just like the twins, looked just plain exhausted. Harry was having immense difficulty remembering why he was still angry at her.

"I knew that he'd go for Peter first or he'd try to find you. Then you came to Diagon Alley. I watched you wonder round, and it was obvious who you were. I mean, look at that hair." Here she reached out and ruffled it affectionately. He couldn't stop himself from smiling. "But I couldn't work up the nerve to go and talk to you. Then you came into the shop with your friends. I came and watched you. I recognised Ron of course, but I didn't really know Hermione so I went and made friends.

"then Ron pulled Peter out of his pocket. It took a while for me to get over the shock, but when I did, of course, I attacked. Then Hermione bought me and I knew Sirius was going to Hogwarts. Not only were you there, but so was Peter.

"I knew Fred and George had the Marauders map, so I used to sneak looks at it till I found Siri one night. He was heading for the Whomping Willow and I met him there in human form." A small smile graced her features for the first time since he'd asked if she was his sister. This was obviously a very happy memory for her.

"I cast a spell to make him reveal himself and proved to him who I was. We went to the Shack and I caught him up on my life. Obviously I skipped out my years as a drunk. We'd meet up every night, just to talk." She sniffled. "I never told Remus I was there. I used to sit in on his lessons. I also used to watch you almost any time you flew. You are one of the best fliers I have ever seen, including Dad and Charles. And both of them could have gone professional.

"At the end of the year, I stayed on as a pet. It's not like I had any better offers. I never spoke to Charlie before the World Cup. But the main reason I stayed was to keep an eye on you. I'm sorry I never worked out about mad-Eye.

"During your fifth year, I mostly went to visit Siri and spied on those I believed to be Death Eater spies. I had to hear about his death from overhearing Dumbledore talking with you when you got back to school. I'd have probably destroyed his belongings too."

Now she was looking directly into his eyes and using them to beg for forgiveness. Forgiveness Harry felt himself giving. The smile fully broke out on his face a few seconds after she had enveloped him in a hug. When they broke apart, Harry could see the tears in his sister's eyes, and feel some welling up in his own eyes.

After a few moments of silence, where they just took each other in, Cat reached down and picked up a pebble which she deftly skimmed across the lake. "Will you give me away at my wedding?"

Harry picked up a stone and mimicked his sister's actions. "Of course."

Cat picked another stone up and got this one farther than either had managed before hand. "Do you want to tell everyone? Charlie already knows."

Now that he thought about it, Harry wasn't sure that he wanted everyone to know. He was only just getting used to the idea himself, and it could take some of the attention away from the wedding. However, he had to tell Ginny. They had promised. No more secrets.

"Not really. I'll have to tell Ginny though."

She nodded before turning to face him once more. "Now, I want to hear everything about those Dursleys. I'm afraid we're going to have to pay them a visit." Her mischevious grin was firmly back in place.

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A/N Sorry I took so long to update, I lost track of the date and didn't post this before I left for my hols. Also, I considering doing a oneshot about when Cat and Charlie met up again in Romania. I just want to get the general view on it. Please Review