Disclaimer: I don't own anything you recognize.

A/n: This is my rewrite of my first story, Blood is Thicker Than Water. I guess I should also label this as AU since Peter isn't in it and the events wont be exactly like the books. Please Read and Review.

Rating M: for sex, drug use and swear words.

Chapter 1: Enter His Other Half

A long sigh escaped his lips, he stared across the room but saw nothing. He wasn't alone in his family's living room, his best mate sat in the other sitting chair in the lavishly decorated room. Both teenage boys still wore their suits from the funerals. He sighed again, running his hand through his messy jet-black hair, his best friend looking up at him at his sudden movement. They gave each other a half smile; they both knew there was no point in pretending to be happy. Even though only one of them had buried his blood parents earlier this afternoon, his best friend considered them more his parents then his own parents. The doorbell rang.

"Not again." The one with messy jet-black hair muttered. He pushed himself up from his seat when the bell rang again. He glanced quickly at the other I-am-sorry gifts that littered the floor and table in the entry to the manor. He pulled open the door without glancing outside to see who was there, "Put it anywhere over there." Nobody walked over the threshold. He glanced around the door; it wasn't a deliveryman that stood on his doorstep.

A girl that looked about his age stood on the doorstep with a duffel bag at her feet. She had on a pair of tight skinny leg jeans with a red t-shirt and vest over that. Her jet-black hair went to her elbows with a middle layer of electric purple. She had on dark black eye liner, a diamond sparkled in her nose and she was playing with the ring in her lip.

"Yeah?' He asked annoyed. She rolled her eyes at him.

"C'mon James. Don't be like that." The girl said. James stared at her dumbstruck.

"I'm I suppose to know you?" James asked, not in any mood to play games.

She snorted, "Are you serious?" She asked, shifting from one foot to another, "It's me Riley." She continued when he didn't answer. His eyes widened in horror, as he looked backed over her. He began to notice almost all the same features he saw when he looked in the mirror.

"You've got to be kidding me!" He said in disbelief, "Now, you come? Well you're a little late." He spat.

"I know I missed the funeral but would you have wanted me there?" Riley asked, her voice rising to meet his.

"Right, like I don't want you here now." James said loudly as he tried to close the door in her face but she stuck her foot out and pushed the door open.

"James, I'm sorry I haven't been the perfect sister but this is my home too." Riley yelled, as she threw the door back open.

"No, it's not."

"Prongs, what's going on?" James's friend appeared next to him in the doorway. He was looking between a heavy breathing James and a flushed faced Riley, "Who are you?" He asked Riley.

"You can't tell." She said.

"Oh, I can tell but I can't believe it." He said.

"Jacklynn Riley Potter." Riley said, "But if you ever call me Jacklynn, you wont be able to prove you're a man." She added with a playful smirk on her lips.

"The Potter charm, I see." He muttered, "Twins?" He asked, not believing his own eyes. He turned to James, "I can't believe you have never told me."

"This house is mine and Sirius's, not yours." James growled at Riley, ignoring Sirius, "Everything is ours; you don't deserve any of it." His words stung Riley.

"I loved them." Riley said quietly.

"Yeah, every time you needed bail money."

"Okay, shut it. Both of you." Sirius bellowed, "What the hell is going on?"

"James wont let me come home." Riley said as if it was plan as day.

"She left this home a long time ago. She left us all." James said; Riley rolled her eyes. Sirius stared at her as if expecting an explanation.

"One, I didn't leave them all." She said to Sirius, "I wasn't wanted."

"Bull…"

"Shut up." Sirius interrupted James.

"I wasn't the poster child that dad's campaign manager wanted." Riley said, "It didn't matter to me. I hated the life that dad was making us live. Always in the limelight, only a photo opts for good press. Mum was always upset. I couldn't do it. I was more than happy to leave. So I've traveled across Europe for the last six years; going to schools like Beuxbatons and Durmstrang during the year, working odd jobs during the summer and sometimes, in the last few years, getting a tutor instead of going to school." Riley said.

"Getting arrested. Calling only when you needed bail money. Making mum and dad miserable." James added in the same reminiscent voice as Riley. Riley wouldn't look James in the eye and Sirius assumed some of that was true.

"Their murder hurt me as much as it hurt you." Riley told him, "Everything is rightfully mine as it is yours and uhh…Sirius's."

Sirius could still see the anger boiling in James, "Prongs, you can't send her away." James gave Sirius a dirty look and Sirius knew he was being viewed as a traitor.

James swallowed hard, "Fine." He stepped aside; Riley cast Sirius a grateful look before as slung her duffel bag over her shoulder and stepped over the threshold.

"I don't want to see you, here or at school." James said to Riley's back as she stood in the entry of a home she hadn't been in for years.

Riley shrug, "Fine with me." She continued upstairs to either fix up her old room or make up one of the other rooms.

"I can't believe I listened to you." James told Sirius as the door shut behind them and they watched Riley take the stairs to a time.

"She's your sister." Sirius said as he finally loosened the tie around his neck.

"Would you have done the same for Regulus?" James asked him.

"That's different." Sirius said quietly; James gave him an incredulous look.

----

Sirius was slowly following a speedy James through King's Cross; James was in a hurry to get back to his girlfriend, since he hadn't been able to see her for the last month since she went on holiday with her family. Sirius looked around the muggle crowd, not able to spot Riley; the trio had arrived at the together but quickly lost each other. James didn't wait for Sirius at the barrier but Sirius didn't mind, he particularly didn't want to be at the reunion of the couple after being apart for a month.

Sirius took refuge in one of the compartments in the middle of the train but wasn't alone for long. The door slide open just as Sirius was starting to drift off and a tall lanky sandy haired boy walked in, dragging his trunk behind him. Sirius snorted.

"Why didn't you just shrink it?" Sirius asked with his eyes shut and a smile on his lips.

"Because Padfoot, not all of us have birthdays as early as you." The boy said. Sirius's smile widened. After storing his trunk, the boy took a seat on the bench across from Sirius, "How was you summer?"

"Good. I got an inheritance from my uncle. I'll finally be able to move out of James's after this year. Oh and some real interesting shit hit the fan two weeks ago" Sirius said. "Yeah." The boy asked, cocking an eyebrow.

"Oh yeah." Sirius said, not bothering to elaborate, "How was your summer?" Sirius continued, disappointing his friend.

"Same old, same old."

The compartment door opened once again, James and his auburn haired girlfriend took up seats next to Sirius.

"Hello Evans." Sirius said to the girl, "How are you?"

"Good Sirius, thanks for asking." She said.

"Remus, mate, long time no see." James said to his friend across from him.

"How have you been?" Remus asked with concerned; the last time he had see James was two weeks ago at his parents' funeral. James shrugged, "Lily, I heard your family took a trip to France."

"Yeah, it was amazing." Lily said and continued into a description of all the landmarks that she and her family had traveled to.

Riley slowly made her way through the King's Cross, taking in all the different people. She discreetly leaned against the barrier between platforms nine and ten before being swallowed by it. Her eyes widened at the sight of the large scarlet train; she had forgotten how invigorating the feeling of anticipation at the sight of the large train was. She weaved her way through the crowd, recognizing a few matured faces that she had seen seven years ago on her first and only trip to Hogwarts.

Riley didn't realize how hard it would be to find a compartment. In her first year, no one knew each other (except for the older students, of course) and everyone was willing to meet new people and welcomed new comers into their compartments but it wasn't as easy to meet a bunch of seventeen years olds, especially ones so different from yourself. She was nearing he center of the train and growing bored with the search of finding a compartment empty enough for her to sit in and people she was actually willing to sit with; she had come across a couple of half empty compartments with Slytherins, she wasn't desperate enough to sit with them. Riley looked into one compartment and found it had plenty of room for but she wasn't sure was willing to sit with them either but Riley was too bored and tired to continue looking. She slid the door open.

The auburn haired girl that Riley hadn't seen before was just finishing her description about her trip the Louvre when Riley opened the compartment door. She looked up at Riley with a sweet smile; Riley figured that smile wouldn't last long as long as her brother's arm stayed around the girl's shoulders.

"Look everywhere else if full and I'm too tired to continue looking." Riley explained, "I don't want to be here as much as you want me here."

Remus looked to Sirius for answers as Riley made her way into the compartment; Sirius nodded answering Remus's silent question. She sat down next to Remus; as she sat down James got to his feet.

"Lily, we better get to the Prefect's compartment." James said looking at his watch, "You coming Remus?"

"Yeah, I guess I should." Remus got to his feet, as did the girl across from her.

Riley laid out on the now empty bench as the compartment door slid closed again. She closed her eyes as she snuggled into the cushions but had the prickly feeling that someone was watching her. She opened one eye and found herself looking to a pair of grey eyes.

"Yeah?" She asked as she closed her eye again.

"We are all alone in here." Sirius said.

Riley cocked an eyebrow, "Don't worry, I've never killed anyone." She said with a smirk and added, "Yet."

Sirius laughed, "Well, I just thought that we could entertain each other. It's a long ride, you know."

"I do know. I was here for my first year but that was about the time I was planning to leave home." Riley told him.

"You were here?" Sirius asked shocked, "I can't believe I don't remember you; you seem hardly unforgettable."

Riley was shocked to feel her face heat up at his comment, "Anyways, aren't you not allowed to talk to me?" Sirius snorted.

"I don't always listen to James." Riley gave him a legitimate smile, not a smirk that he had noticed she did a lot and found himself wondering how James could hate her so much, "Want to play Exploding Snap?" He asked her.

"Sure." She said sitting up.

A/n: So there is chapter one and the start of something between Sirius and Riley. Don't forget to Read and Review.