This is the beginning of something I have been thinking about for a while now…a 'what if…' situation if you will, and I just couldn't get it out of my head! I hope you will like this!

An Old Friend

"Boston PD needs our help," JJ announced as the BAU gathered in the conference room on a sunny Monday morning, everyone taking their seats around the round table. "Last night this man, identified as Curtis Pearce was found in a dumpster behind a local grocery store, stabbed to death. The Medical Examiner as well as the lead detectives on the case immediately linked his death to the death of two more people found in the last month; both Riley Grand and Tony Fulmer, who were also stabbed to death and found left in different dumpsters around the city," she explained brining up the photos of the other two men, the team browsing their files in order to see the after-death photos. "There haven't been any leads on the case. No DNA has been left behind and the kills are beginning to accelerate."

"Our unsub definitely has a type," Reid said as he scanned through all the information that they had. "All three men seem to be successful and pretty well off money wise, physically they're all well-built, dark hair."

"Could be an image the unsub wants to destroy," Morgan nodded along with the young genius. "He could see something in these men that he despises or may want for himself."

"The stab wounds all seem to be in relatively similar patterns," Emily said, looking at each picture in her file. "It's as if he's stabbing these men in exactly the same places."

"That's actually how the ME linked the first two murders," JJ replied, having spoken to the Detective on the case early that morning. "Apparently she noticed the location of all the wounds during the autopsy on Mr. Fulmer and referred back to her notes on Mr. Grand to confirm her suspicions," she explained. "When they found Curtis Pearce last night the locations of the stab wounds was the first thing she looked at."

"We're definitely looking at a serial and given the fact that the last two kills were only a week and a half apart it's likely our unsub will strike again soon," Hotch said, standing from his seat. "Emily I'd like you to work with the ME when we arrive in Boston. Are you up for that?"

"Of course," Emily nodded, knowing she needed to stay out of the field for her own health and safety.

"Great," Hotch nodded, with the hint of a smile. "Wheels up in 30."

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When they arrived in Boston, Hotch had immediately given out orders, the team all going their separate ways as Rossi and Morgan headed for the latest crime scene, Hotch and Reid went to BPD to meet the lead Detective on the case and JJ and Emily went down to the morgue to meet the Medical Examiner who was working the case as well as see the bodies for themselves.

"So apparently we're meeting the Chief Medical Examiner of Massachusetts," JJ told Emily as the elevator made its way down to the BPD basement. "From what I've heard she's highly respected and extremely professional. She's extremely precise and never guesses or risks losing any sort of evidence."

"Oh yeah?" Emily quirked an eyebrow, laughing. "And who told you all of this?"

"The Detective on the phone," JJ shrugged. "From my understanding this team has the highest rate of closed cases in Boston but they've been unable to find any clues or leads to help them with this case. It didn't exactly sound like they were thrilled to have to call us in."

"Well we'll have to change their minds about that then won't we?" Emily grinned; knowing their team usually won local law enforcement over in time. "So let's get to it," she said as the elevator opened, JJ allowing her to exit first as they both made their way down the hall. "Excuse me," the brunette knocked on the door as she and her wife let themselves into the morgue where a woman was working over a body. "We're Agents Prentiss and Jareau with the FBI's Behavioural Analysis Unit, we were called in to assist with the recent…"

"Emily!" The Medical Examiner interrupted, spinning around to face the two agents with a look of shock on her face. "Emily Prentiss?"

"Maura!" Emily's jaw fell open. "Oh my…what are you…I thought you were…you…you're the Chief Medical Examiner?"

"For about two years now," Maura replied, her eyes looking a little misty as she really took in Emily, her eyes eventually landing on her stomach. "I can't believe you're…BAU?" She shook her head in disbelief. "It has been so…wow…It is so good to see you," she continued to shake her head, looking like she wanted to hug the brunette before she remembered she was in her scrubs. "And just look at you!" She gestured towards the other woman's obvious baby bump.

"Me?" Emily replied, her eyes also glassy with tears, the pair obviously overwhelmed by their joy at seeing each other. "Look at you! You look great! How far along are you?"

"I'm sorry," JJ interrupted before Maura could answer. "I don't mean to be rude but you two know each other?" She asked, confused by both women's emotions and unable to remain silent any longer. "How do you two know each other?"

"Oh Jen, I'm so sorry," Emily only just seemed to remember that JJ was there with them. "This is Maura Isles," she introduced rather unnecessarily. "Maura and I went to boarding school together, gosh…lifetimes ago," she shook her head, still clearly shocked to see her old friend. "From ages oh…13-16…before I came back to the States. We were…well we were best friends but we haven't seen each other in years. Maura," she turned back to the Medical Examiner. "This is Jennifer Jareau. She's the Media Liaison with our team and also my wife," she grinned.

"Oh! Oh wow! It is so nice to meet you," Maura went to shake hands before once again remembering her gloves. "I'm sorry," she put her hands up. "But wow. Emily Prentiss married and having kids that's just…wow," she smiled, still shaking her head as if she couldn't quite believe it. "I'm just five months along though, to answer your previous question. What about you? You look a little further than that."

"That's because there's two in there!" Emily was beaming. I'm five months as well! Can you believe that? This is just to…I can't even believe you're here. Last we talked you were in San Francisco. I should have checked in with you more often," she was rambling now. "I have so many questions. How is Amelia? Are you married now? You're not back with what's her face are you?"

"No, no I'm definitely not," Maura quickly shook her head. "Amelia is wonderful. She's seven and just amazing and so excited to be a big sister," she continued, a big smile on her face. "I am married as well. Her name is Jane Rizzoli and she's a Detective here at BPD…the Detective on this case actually, so you should meet her when you go upstairs."

"That's great Maura," Emily replied as JJ stepped a little closer, giving her a look that said they needed to get back to work. "God I could spend forever catching up but we really should get into the case; our team is waiting for us."

"Oh…oh yes of course," Maura nodded, looking as if she had forgotten where they were. "I will show you what I've found," she led them back towards the body of their most recent victim. "Perhaps we will be able to catch up before this is all over?" She had to ask.

"Of course," Emily smiled. "I'd love that."

"Wonderful," Maura returned the brunette's smile. "Let's get started then."

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"Are you sure you won't come with me?" Emily asked JJ later that night, the couple in their hotel room. "I mean you need to eat."

"I will eat. I'll order room service," JJ replied, already changing into a pair of pajamas. "You and Maura obviously have a lot of catching up to do. You don't need you old wife hanging around."

"I always need you around," Emily replied, grabbing the blonde and pulling her in for a kiss. "And you're sure you're okay with me going?" She had to ask.

"Of course," JJ rolled her eyes. "I'm not some jealous wife Em. You and Maura are old friends. I get it," she shrugged. "Plus her and Jane seem happy together so I don't really think I have anything to worry about."

"That's true," Emily laughed. "Jane is…"

"Hot," JJ interrupted the brunette; laughing at the raised eyebrow Emily gave her. "She's definitely hot and Maura definitely has a type."

"What do you mean?" Emily asked, looking confused.

"I mean Maura obviously has a thing for strong, confident, dark haired women," JJ replied with a smirk. "I mean you and Jane may not look alike but there are similarities in your demeanor," she explained. "I mean you and Maura were obviously a thing."

"We weren't…" Emily started to argue but then shook her head, thinking better of it. "We were young," she went with instead. "Neither one of us really knew who we were, we really didn't have any family…we were best friends," she shrugged. "We were all each other had for a long time."

"And you were in love," JJ said, feeling like she was right.

"I'm not sure we really knew what love was back then," Emily sighed. "But we thought we were," she added. "We were just too young and confused to really know what to do with that. We ended up being better off as friends," she told her wife. "You know Maura was the only person outside of my parents I told about Alex," she confessed. "I didn't tell her until I had already decided to give Alex up and I didn't see her until after I had given birth, but she was the only person I ever talked to about Alex."

"Wow," JJ sat down beside her wife, taking her hand. "She must have been a pretty important part of your life then," she said. "How come you two lost touch?"

"I don't know really," Emily shook her head, thinking back to the last time she and Maura has spoken, not remembering any sort of argument or event that had caused them to stop speaking. "We were in different States, we both had different things going on and we just sort of lost touch. It wasn't like something happened that made us stop speaking or anything, it was just…I don't know," she shook her head again. "Maybe part of me needed to let her go in order to really let go of my past…I'm not really sure. I missed her though. I really missed her."

"I can tell," JJ nodded, running her hand over her wife's hair before leaning forward and placing a kiss on her temple. "This seems kind of like a second chance for you guys. You both seem to be in the same place now, so go," she gave the brunette an encouraging smile. "Go catch up. Go tell her about Alex and I don't know…invite her and Jane to visit us when they get the chance. Okay?"

"Okay," Emily smiled, pulling JJ in for one last kiss. "Thank you."

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Emily wasn't really sure why but she was nervous by the time she arrived at the Dirty Robber; the bar Maura had suggested they meet at. The brunette thought it seemed a little strange that two pregnant women would meet at a bar, but according to Maura it was close to BPD and the food, which she normally didn't really enjoy, seemed to be exactly what she had been craving through her pregnancy.

Walking into the bar, Emily had found Maura waiting for her, already seated at a booth with two glasses of water sitting in front of her.

"Hi," Maura had raised a hand to wave Emily over even though she was already on her way over. "I'm so glad we could do this," the honey-blonde smiled. "I ordered you a water. I wasn't really sure if you would want a soda or anything else but soda actually isn't…"

"Water is great Maura," Emily interrupted, knowing the Medical Examiner was rambling out of nerves. "Thank you," she smiled reassuringly. "Do you know what you're having?"

"I'm craving a burger…and fries," Maura replied, looking slightly guilty. "But don't tell Jane because I always give her a hard time about her eating habits and she is getting a kick out of my pregnancy cravings."

"You're secret's safe with me," Emily laughed. "Actually a burger sounds great, I think I'll have the same."

"I'll order at the bar that way we don't have to wait," Maura said, going to talk to the bartender a few moments before returning to the booth. "I still cannot get over the fact that you're here. After all this time, our work ends up bringing us back together. It seems a bit like a second chance."

"Jen said the same thing back at the hotel," Emily grinned. "I'm so sorry I lost touch though Maura. I'm not even sure how it happened it just…"

"I know," Maura nodded in understanding, reaching out and placing her hand over Emily's needing the contact. "Let's just try and move past that and just catch up again. So what's going on? Tell me about your life. You're having twins, do you and JJ have any other children?"

"We do actually," Emily nodded, feeling excited but slightly nervous to share her story with her old friend. "We have a two year old boy named Henry," she told her. "He's JJ's from a past…well a past fling I guess, but we've been together since before he was born and I absolutely adore him," she explained. "And we have…well…I have her with me Maura," she finally told her. "My daughter…Alex…my daughter that I gave up…she's living with me now."

"What?" Maura was shocked. "But how? Why? What happened? When did this happen?"

"Two years ago," Emily answered the easiest question first. "Her parents were killed by a serial killer and my team was called in on the case…my team who had no idea that I had a teenage daughter that I hadn't seen since the day she was born and I gave up for adoption," she continued. "Her parents left her to me in their will and suddenly my life had completely changed. She was 14 and scared and grieving but we managed to figure it out and Jennifer eventually joined our family and life has been pretty great to be honest."

"Wow that is…I can't believe that," Maura shook her head as if trying to wrap her mind around the whole thing. "Tell me about her. What's Alex like?"

"God Maura she's just…she's absolutely amazing," Emily was quick to reply. "She's sixteen now and she's so smart and ambitious. She plays soccer and she's a great singer as well and she's the best big sister," she explained, a smile on her face the whole time. "She's everything I ever imagined she would be and so much more. I never imagined I would ever get a chance to be in her life and I honestly hate the way it happened, but it has been amazing getting to know her."

"That's incredible Emily," Maura replied, seeing a happiness in her friend that had been missing in the years after giving her baby up for adoption. "I'm so happy to see that things have been going well for you. JJ seems wonderful as well."

"She's my soul mate," Emily replied with a shrug. "I don't know what I would do without her," she admitted. "But what about you? Jane seems great, although I'd love to hear how you two got together."

"I suppose she sort of took me in when Amelia and I first moved here," Maura told her, looking as if she was thinking back to that day. "At first we were just friends. Amelia was taken with her immediately and we all started spending quite a bit of time together," she explained. "Eventually we both realized that our feelings were more than just friendly and we've been together ever since. She has been absolutely amazing and Amelia and I have been so happy. We're all so thrilled to expand our family."

"Do you know what you're having?" Emily had to ask.

"It's a girl," Maura smiled. "Amelia really wanted a little brother, because Jane has two brothers, but she's pretty excited about a little sister now. What about you?"

"Two girls," Emily couldn't help but laugh at the way her and Maura's life seemed to be intersecting.

"Imagine that," Maura shook her head, in disbelief. "Both having girls and evidently due around the same time, although with multiples you're more likely to go into labour early."

"Yeah that's what I was told," Emily nodded. "But it is kind of miraculous isn't it? The way our lives have turned out," she clarified. "Would be a shame if we didn't get those little girls together at some point you know; or before that...I would love for you to meet Alex."

"And you have to see Amelia," Maura told her. "She has grown so much and I would love for her to know you," she added. "Obviously we have work to do now but perhaps we can arrange a meeting at a later date…when we don't have a serial killer to deal with?"

"Jen already suggested inviting you, Jane and Amelia to visit us in DC," Emily replied. "We'd love to have you for a weekend if you think you and Jane could get away."

"That would be great," Maura was quick to agree. "I'll talk it over with Jane but…" she was interrupted by the ringing of both her and Emily's cell phones. "Oh…oh no."

"Looks like we'll have to cut this short," Emily sounded disappointed. "Duty calls."

I have wanted to cross over my two story worlds for ages but I could never figure out a time to do it, but I figured why not use a one-shot to open it up! I will be revisiting this later and will likely have a corresponding chapter in my Rizzoli and Isles series. If you do not read my other series, I hope you're able to follow along…also now would be a great time to start reading it! J