Chapter 1

JJ sat her desk, quietly doing her work. Her office was messy, this was usual, but more so today. Things had been hectic in the BAU lately. Cases were becoming more bizarre and often, JJ felt like she couldn't catch a break. That's why her wonderful boss, Hotch, gave them the week to catch up on paperwork. Not only had she been very grateful, her team was as well. That was Monday when the good news arrived, now it was Friday, and things had only gotten crazier. JJ's whole life was about to change in a matter of two hours. Memories flashed to her tired mind.

Monday Afternoon

"Hello, this is Agent Jareau." JJ said picking up the phone.

"Hello, Agent. My name is Melissa Sanders. I'm with the Child Services Center in Pittsburhg. It's to my understanding you grew up here?" The kind lady inquired.

"Yes?" JJ said, confused by the situation.

"Well you should already know by now, but I was just calling to make plans to transfer Keslie Jareau to you?"

"Wait, what?" JJ blurted.

"Im sorry, you don't know?"

"Know what?" JJs heart dropped to the pit of her stomach.

"Im afraid your mother and step father have been murdered." Melissa said with a regretful tone.

"You must be mistaken." JJ said, but the tears were already trailing down her face. She knew the truth. And she knew this would happen one day, that day had come and gone, and she hadn't even known.

"Im afraid not. I can't believe you haven't been informed yet."

Just then Hotch knocked on her office door and entered when she gave the "okay". Two men followed behind.

"Hello, Agent Jareau?" The bigger of the two men inquired.

JJ stood and reached out her hand to politely shake his.

"Yes?"

"Im sorry, we have some bad news."

JJ shook away the thoughts. Her parents' murders were now her teams case, her private life and past was now on the line. While on top of that, her kid sister, Keslie, who's 15 years old, was now coming to share JJ's life. JJ was now the legal guardian of a child, well a teenager, which is a much different story. And she was terrified.

JJ knew her horrifying past was going to be brought to light. She knew that the baggage she and Keslie, and even her mom, had carried around for so long, was soon to be shared with her team. Her family. She didn't know which scared her more, sharing the traumatizing secrets, that she had buried away for so long, or now being responsible for a traumatized and unstable teenage girl.

JJ was once more ripped from her thoughts by a knock at her door. She quickly checked her watch and saw the time. The short two hours had passed, and now it was time for JJ to completely change her life, as well as Keslie's.

"Come in." JJ called out, stacking files and trying to make her office look at least slightly decent and presentable.

A kind lady, which she guessed to be Melissa Sanders, stood in the doorway, with a timid Keslie standing behind her. JJ and Keslie didn't know each other very well, considering the huge age gap, JJ was 15 when Keslie was born, so JJ only lived with her for the first few years if her life.

The pair walked in and greeted JJ. Keslie wrapped her arms around JJ's petite waist naturally. It was comforting to know, that even in the horrible state she was in, and they hadn't seen each other in years, they could still hold on to the hidden sister strength, and have a comfortable embrace. A wide grin crossed JJ's face and she too wrapped her arms around Keslie.

"It's been too long." JJ whispered in her ear.

"Well, I have all the paperwork right here, all I need is for you to sign a few things." Melissa interrupted after a few moments.

The two sisters broke off the embrace as JJ sorted out the legal matters.

After Melissa left, JJ got Keslie comfortable in one of the chairs across from her desk, they were going to have a lot of talking time, not only for the federal matters of finding the brutal murders, but also for the emotional feel they both needed. They needed to bond over their baggage and past trials, to become closer than JJ and Rosalyn ever were. It wouldn't be easy, but it would definitely be worth it. JJ loved Rosalyn more than anything in this world, she wasn't going to lose Keslie too.

"Let me introduce you to my team." JJ said, after a few seconds of awkward silence.

"Your team?"

"Yeah, there's 7 of us. We work in a special unit called the BAU." JJ smiled lightly.

"What does that stand for?"

"Behavior Analysis Unit. We are profilers. There's a team of us and we go all of the country profiling and taking down serial killers." JJ paused. She opened the door and led Keslie out of her office. "It's pretty cool huh?"

"Yeah." Keslie agreed and gave JJ a genuine smile.

JJ led Keslie out into the bull pen. Everyone was sitting around Reid and Morgan's desks'. Somebody must have said something funny because right before the two girls rolled up the team started casually laughing.

"Whats so funny?" JJ asked.

"Pretty boy has a date tonight." Morgan offered.

"Oooh. A date? With who?" JJ asked.

"It's really none of your guys' business." Reid retorted.

"We are going over the do's and dont's." Emily said.

"Like dont tell her what the square mile radius of Virginia is." Rossi chimed in.

"And do tell her you like her shoes." Emily advised.

"What if I don't though?"

"Doesn't matter. You'll tell her you do." Morgan said and patted Reid on the shoulder.

"That makes no sense." Reid muttered.

JJ took the brief pause to break the easy banter and introduce her new young charge.

"Everyone, this is my little sister Keslie." JJ said and moved her hand to Keslie. She put her hand on the small of her back and pushed her up right next to JJ.

"Hey kid. You look just like your sister." Morgan said with a smile.

The two girls met eyes and smiled.

"Keslie is going to be living with me now." JJ offered.

"Whys that?" Garcia asked.

Before JJ could answer Hotch pooped out from his office.

"Case on deck." Hotch said.

Well, let me know what you guys think. Your guys' reviews feed my muse and keep me updating, so - let me know if I should continue or not. This is definitely AU and is going to get super intense, angsty, suspenseful, yahta yahta, and all that great stuff. Hope you like it.

Thanks.