Here we are with Chapter One of our new story for all of our Hotch/Prentiss fanatics. This is dedicated to my beautiful friend, SouthunLady. This one is going to be a little different, but always Hotch/Prentiss.

A/N: Emily has worked at the BAU for three years, and she decided to leave when she gets a wonderful job offer in London as the head of the London Office of Interpol. She takes the offer right away with many reasons behind her decision, but the most important one is that Hotch and her completely hate each other, and they have since she started at the BAU. Several years after taking the Interpol position, she returns to the BAU, only she has a big secret that will change her relationship with her old boss forever.

Unforgettable Nights, Unforgivable Mistakes

Chapter 1: Life Changing Decisions

Emily was walking toward her car after stopping at her long-time favorite coffee shop. Okay, she had sworn she would cut off her caffeine amounts, but today, at least just today, she really, really needed that triple shot latte. Not only was she about to have a very long day, but this was also one of the last times she would enjoy the delicious coffee from Baked & Wired. She walked to her car sipping on her coffee, and for a few seconds, she really didn't want to go to work today, but she knew she had to, no matter what. Well, she really didn't have to go, but she wanted to end this job in the right way. Yes, tomorrow was officially Emily's last day at the Behavioral Analysis Unit, in fact, tomorrow was Emily's last day in the USA.

Emily had accepted a life-changing opportunity as head of the Interpol Office in London; of course, this was an opportunity to die for, and she was beyond happy. Well, that was not entirely true, she was sad about leaving her friends and everything she had built for the last three years, but this was just exactly what she did all the time...run away from her own mistakes and put new borders between those problems. That was exactly what she had done when she moved to America...run away from her past with Ian Doyle, a wanted criminal she had put behind bars. Of course, Emily had to infiltrate into his life and pose as his lover to get him...it was her job, yes, but she had felt terrible about that, and she would never forgive herself for screwing someone to make a case, so she had done the only thing she knew how to do, run away.

She had gotten a great offer at the Behavioral Analysis Unit at the FBI, a job she had always dreamed of, an opportunity many FBI agents wished to have. So, she jumped in with both feet and took the job starting another new adventure in her life. At first, it was difficult because she didn't know anyone in Virginia, but after a while it got easier. She managed to perform very well at her job and got somewhat comfortable. She immediately bonded with Jennifer Jareau, better known as JJ, the liaison and media communicator for the team. JJ was about the same age as she was, and they found out they had so many things in common that they quickly became good friends...in fact, JJ had become her best friend. She became the closest thing to a sister Emily had ever had. Emily also connected quickly with Penelope Garcia, the technical analyst...her amazing heart and bubbly personality quickly gained Emily's heart, and Penelope, too, became one of her best friends.

The boys weren't that hard to connect with either; she had a very charming personality and always found it very easy to get along with males. Derek Morgan was the easiest of all...he was funny and exceled at his work. He quickly opened up to the brunette and began a friendship almost immediately. Emily saw him as a big brother that protected her and watched after her. Spencer Reid had probably been the most difficult of all, but in the end, he, too, won Emily's heart. The quiet genius boy often isolated himself from the team, and Emily had a difficult time getting along with him at first, but after awhile, she started to listen to him and comfort him when needed. Emily basically became an emotional sounding board for him, and soon she realized how much he admired her, and she took the position as his big sister. And David Rossi was just the cherry on the top. Rossi had always been nice to her...since day one. He often was by her side when she had trouble adjusting to the team, Rossi was basically the dad that watched over everyone. So, the team became her family, a big part of her heart that she would always remember and take with her. That was one of the things that pained her the most, leaving this amazing family she had come to love over the past three years. Of course, it also pained her to leave her job, this was something she had always wanted even when she was a child, she would have killed to get this job. It was clean, she knew the good guys and the bad guys, and the reward it gave her every time they put another criminal behind bars and saved a life was indescribable. She loved her job and what they did everyday...yes, it was a dangerous job, and on numerous occasions, she came home with bruises and scars, but at the end of the day, she knew she was doing something to make the world a better place, so she felt immensely happy.

But, here she was again running away from all of this, taking a new job in another country and about to start her life from zero again. The opportunity was great, she couldn't deny that, being the head of Interpol was a job that never in her life did she ever imagine she would get. It was a better opportunity and position with better pay and benefits than the one she currently had, and she got to be the big boss for the first time in her life. It was probably the best opportunity she would ever be offered, but she still found herself in such a dilemma about what to do, and that was why she hesitated to take the job at first when it was offered to her.

Flashback:

Three weeks earlier:

Emily had just returned to her home from a very long and exhausting case. They had been in Oklahoma for three weeks solving a series of different murders that had occurred in the same area almost every Tuesday. Three women had been kidnapped and later found with their organs removed from their bodies; at first, they had believed they were dealing with an organ trafficker, but then, when they found the organs several miles from the first crime scenes, they realized they were dealing with a much more serious issue. It took them several issues to resolve this case, but they finally did...they apprehended the unsub and saved another life. Now, she was home and wanted to do nothing but sleep for the next three days.

She walked into her kitchen after she had taken a long comforting hot shower, and now she was ready to relax, drink some wine, go to bed and sleep until her back hurt. She was pouring herself a glass of wine when her cellphone rang. Emily exhaled angrily, it had better not be a case...please!

"Prentiss?" She answered without even looking at the screen.

"Wow, is that how you answer your old friend's telephone calls?" The voice of Clyde Easter asked, offended.

"Oh my God, Clyde...what an amazing surprise." Emily smiled widely.

"Hello, beautiful, it's been what...three years since I last saw your pretty face?" Clyde asked, in his sexy accent.

"Yes, something like that." Emily laughed on the phone.

"You promised you would come visit, and you never did!" Clyde chastised.

"I know, do you realize how busy my job keeps me...it's insane?" Emily said, sipping at her wine.

"Yeah, I assumed that much, maybe you should leave the BAU, it sounds like they treat you like a slave." Clyde joked. Emily smirked.

"Yes, and what do you suggest I should do for a living...work at a strip club?" Emily teased.

"Well, that wouldn't be a bad idea, I'm sure you would make a fortune." They both laughed.

"Or, you could come back to London." Clyde said gently, smiling widely.

"Work for Interpol again? That'll be the day!" Emily said sarcastically.

"Not work, darling...RUN." Clyde offered. Okay, now Emily was officially in shock and stood holding her phone with her mouth open...in silence without knowing what to say.

"I've been promoted, so the team is yours whenever you want." Clyde finally said.

"Are you serious?" Emily asked, when she was able to speak.

"Is that a yes, then?" Clyde asked, ignoring her question.

"Um...I uh..." But, she didn't know what to say.

"Think about it, please?" Clyde insisted.

"Uh, okay...I...will." Emily said in shock.

"You know I would love to see your beautiful face again." Clyde said.

"Yes, I would like to see you, too." Emily finally said, smiling.

"Come on, Emily, don't you miss this?" Clyde asked.

Emily didn't answer, she just stayed quiet.

"So, I'll wait for your call then?" Clyde asked.

"Yes, I have to think about this."

End of Flashback

Still in shock, Emily hung up the phone; she couldn't believe what she had just heard. Clyde, her old Unit Chief at Interpol, had just offered her the position to run the London Interpol Office, a major promotion...a once in a lifetime opportunity. This was not something you thought about, this was an opportunity you said yes to immediately. However, Emily knew that she needed time to think this through before she made any decisions. She had her current job to consider, plus her friends and family to think about. She absently placed her phone on the counter...what was she going to do?

That had been three weeks ago, and she was going to leave the day after tomorrow. Although she was happy about the decision she had made, and she was definitely sure it was the best thing to do, her heart was still aching. There were so many things she was sad about...she was going to leave her friends, the one family she had where she had felt safe and loved, the amazing people who impacted her life in so many ways for the last three years. It wasn't easy, of course, goodbyes were always hard, but this was different. Emily truly felt like she was leaving a big part of her life behind. In any other situation, she would never have left America...she had finally found what she wanted in life, a job that she loved and enjoyed doing, a beautiful, nice home and an amazing family that had stolen her heart. She truly had felt at some point that she had finally gotten everything she wanted, so what had led her to make the final decision to leave all of this behind and move to another country?

She was running away again, and this time she didn't think she would ever come back. But, what was she running from? Or, actually whom was she running from? That was it...who? That was the entire answer to everything...WHO. Emily Prentiss never thought there would be a day when she would be running away from a man. She had always had a talent for handling men; in fact, it was always them who ended up heartbroken and dazzled by the brunette. But this time, it was different, she was willing to leave everything behind, her life, her friends, the job that she loved because of a man. Emily was moving from America to be as far away as she could from none other than the very stoic Unit Chief Aaron Hotchner. Yes, that was right...Aaron Hotchner was the main reason why she had made the decision to leave the only place she had ever considered a home.

Emily turned the ignition of her car and decided it was time to drive to work and face him, two more days and she would never have to see him again in her lifetime. She never really understood why she hated him so much...okay, wait, hate was a very strong word, she didn't hate him, but she did dislike him completely, and she had since her first day at the BAU. Aaron Hotchner was the only person on the entire team she had never managed to get along with and not for lack of trying, because she surely tried on several occasions to break the ice between them, but she had never succeeded. To this day, she didn't understand why he had never accepted her as a part of the team. After three years, Aaron Hotchner still acted like a complete jerk to her, no matter what she did. When she first started at the BAU, Emily knew it would be difficult to prove herself to the team and to her boss, but she was very determined and driven, and she knew she could gain their respect if she really tried. She started on great terms, everyone liked her, and they realized she was very good at her job; even the directors of the BAU were surprised with her abilities. Erin Strauss accepted Emily immediately, and even implied on several occasions that she could have great opportunities in the direction of the FBI with her talent and her abilities; of course, that was also due to the fact that she had several degrees and spoke at least six different languages fluently. But, she was also great at her job...she knew she was doing well, the team had seen it, even Rossi often complimented her, but not the Unit Chief, no...Aaron Hotchner seemed to believe Emily was completely out of her league in the bureau, and the team could perform just as well without her.

She had no idea why he didn't like her or accept her as a part of the team, but he was very obvious about his feeling toward the brunette. He often made her re-write reports and stay after hours, and he had never in their three years working together paired her with him, even when it was absolutely necessary; he preferred to go alone and send the brunette alone as well. Emily had no idea what could possibly be the reason for this behavior toward her, and she had on several occasions tried to smooth things out between them, but had been unsuccessful. It was almost as if he avoided her 100% of the time, outside the job and while on duty. Every time the team gathered to go out for drinks, or at someone's house for a get together, or a party, he didn't go if he knew she would be there. Emily herself had a barbecue at her house several times and all of the team was there except for Hotch, and even at the Christmas celebrations and important holidays, he simply didn't come.

That had been very hard on Emily; she had done everything she could think of to make things better and nothing had worked, and honestly, she was simply tired of trying. No matter what she did, she knew Aaron Hotchner would never like her or accept her, she would never be good enough in his eyes, and she simply didn't want to feel this way anymore. So, she had decided to take the job offer in London. Yes, she would miss her job and her family and everything she had found in DC, but she also wanted to feel happy at her job again, with everything she did, and no matter how much she had tried to avoid the situation, she simply wasn't happy anymore at the BAU.

She arrived at the BAU and parked her car hoping her day would go by rapidly; she got out of her car and made her way to the elevators. She sighed, feeling weird that she definitely had gotten attached to this building along with many other things, but she needed to move on and continue with her life. The elevator doors opened, and she made her way to her soon to be ex-desk, putting down her belongings. As usual, she was the first one to arrive, except of course, for Unit Chief Aaron Hotchner, who was usually there before sunrise. She sat down at her desk and realized she didn't really have much to do. She had turned in her last stack of paperwork the night before and she was basically done. She would check around on some other cases just to keep herself occupied for the next couple of days. Emily was about to open one of the cases when someone called her name.

"Agent Prentiss, I'm glad you're here, may I talk with you in my office for a second, please." The very proper Agent Hotchner said with a sour look on his face, one that Emily had gotten used to.

"Ummmm sure." Emily said, standing up from her desk and walking toward his office. She stepped in as he sat down signaling for her to do the same. Okay, this better not be a bad thing, but knowing him, it probably wasn't.

"What can I do for you, sir?" Emily asked politely.

"I just wanted to check on something with you about the last files you turned in." The Unit Chief said in a harsh tone. Emily arched her eyebrows...she just turned that in last night, what could possibly be wrong with them.

"What about them, I turned everything in last night, every single case." She said, concerned.

"Yes, you did." He said, dismissively.

"Then...what's the matter?" She asked, arching her eyebrows.

"I know that your last day is tomorrow, and you probably don't care about this job any longer, but I still expect you to perform in a decent manner." Hotch said, looking at her with fire in his eyes.

"What do you mean 'decent'?" She asked, offended.

"I need you to re-do these, please." He said, handing her back a stack of files...it was at least eight of the ones she turned in last night.

"Excuse me, you want me to re-write everything again? Are you serious? It took me a week to write these." She stated incredulously. She truly had taken a week, and she knew she had outdone herself with those files.

"They are poorly written, and this is completely unacceptable even for you, Agent Prentiss." Hotch told her, glaring at her. Emily just stood there frozen, she truly fought the urgency to stand up and slap him senseless right across the face, and she felt herself turning bright red.

"While the BAU might not be important to you any longer, you're still expected to meet the standards and expectations." Hotch said, standing up indicating the meeting was over. Emily, however, remained there aghast...she couldn't believe what she was hearing; the reports where not poorly written, and she knew it, she was so angry she truly wanted to kill him.

"Is there a problem, Agent Prentiss?" Hotch asked, realizing she was still sitting down.

"No sir, no problem at all." She said, picking up the files and walking away without even looking at him, but she definitely had fire in her eyes.

Morgan and Reid were already at their desks when she approached her desk. She sat down slamming the files down and opening her drawer angrily.

"Why so charming this morning, princess?" Morgan asked, teasing her.

"How many languages can you say asshole in?" Emily asked, lowering her voice so Hotch would not hear her. Morgan looked up to his boss's office, knowing that he probably had something to do with her anger. Morgan was very well aware of the icy front between her and Hotch.

"Come on, princess, can you two try to at least get along on your last two days here?" He joked.

Emily just shook her head angrily. She was going to be there at least until midnight redoing those files. What the hell did she ever do to him to deserve this type of treatment from him? Why the hell did he hate her so much. She closed her eyes, fighting back the tears, saying to herself, just one more day, and she would never have to see him again.

She basically spent her entire day re-doing those files, she didn't even stop for lunch, when the girls came and asked her to go with them one last time to their favorite sushi buffet, she declined, saying she had a lot of files she had forgotten that she had to finish. It was almost one in the morning when she finished all the files, and to her surprise, Hotch was still there. Strauss had arrived a few hours before, and they were still talking in his office. His door wasn't closed, so she assumed it wasn't important. she really didn't want to interrupt, but she was exhausted. She had arrived at seven that morning, and it was almost one am now. All she wanted to do was go home and sleep. Tomorrow would be the last day she would ever have to see her asshole boss again. She was absolutely sure now, more than ever, that she had made the right decision to leave the country. She made her way to his office and tapped on the door gently.

"I'm very sorry to interrupt." She said, looking at the two of them with a small smile. Hotch just glared at her as if she had just done a very disrespectful thing.

"Agent Prentiss, come in sit down, we were just talking about you." Strauss said, smiling widely at Emily. Great, now what!

"Sit, please." Strauss ordered again. What the hell did they want...it was late, and she wanted to go home.

"Agent Hotchner and I were just discussing how awful it is that you are leaving us. I really wish there was something we could do to change your mind." Emily just looked at her in shock, and by the look on Hotch's face, she was the only one that felt that way.

"You are a such a wonderful and talented asset for the BAU, and your work has always been impressive." Strauss added, glaring at Hotch. Emily knew Strauss and Hotch hated each other.

"Thank you, ma'am." Emily said, since she didn't know what else to say.

"I mean, Agent Prentiss, the work you turned in last night was beyond outstanding...even the directors were impressed." With that, Emily's mouth dropped open. She turned to look at Hotch incredulously, she had just spent nearly eighteen hours rewriting those reports, okay, now, she was seriously pissed.

"Thank you, ma'am." She said again, shaking.

"You would have made a great Unit Chief for this division." Strauss added, looking at Hotch evilly, that obviously had made Hotch very uncomfortable.

"It is such a shame we are losing you, Emily. I do really wish you the best." Strauss finally added, shaking her hand, as she turned around and look at Hotch.

"We will continue our conversation tomorrow, Agent Hotchner." And with that, she walked out of the office leaving Emily and Hotch alone. Emily was bright red, and Hotch could see it on her face.

"Here are the files, Sir." She said, looking at him with hatred in her eyes.

"I hope this does meet with YOUR expectations." She added a little coldly. Hotch was going to say something, but she didn't let him. She stormed out of his office without even looking at him, walking to her desk and picking up her belongings. She got on the elevators praying to God to give her the strength to compose herself and tolerate him for one more day, One more day, that was all she would ever in her life have to tolerate or see him again.