Disclaimer: I don't own Criminal Minds or NCIS, just the characters you do not recognized.

By Your Side

Chapter 1

Avalon Gibbs listened intently to the young Dr. Spencer Reid from the FBI's Behavioral Analysis Unit (BAU). He was the guest speaker for anyone to attend, however it was more for those majoring solely based on criminology or psychology. Because Avalon wanted to get into Naval Criminal Investigative Service (NCIS), like her father, she had attended the lecture in hopes profiling would help a case quickly. How the young FBI agent had spoke about the criminal's made her think up a good thesis for her paper: How do serial killers become what they are?

As the young doctor had come to a close, the young woman took her time gathering her notes and putting on her sweater. As the last person finally made their way towards the exit, Avalon made her way towards the FBI agent still gathering his own things. As he turned towards the exit, he dropped a load of paper he meant to stick inside his bag. Avalon helped him pick up his papers, noting the man turning red with embarrassment, making her smile a little bit.

They both stood up at the same time, Avalon waiting for the man to gather his papers in order before she handed him the stack that she gathered. Holding the strap of her bag tightly in nervousness, Avalon waited for the man to acknowledge her; which didn't really take all that long as he looked down at her.

"Thank you, for the help." He stuttered slightly, blushing even redder.

Avalon nodded, smiling. "I do have a question, if you don't mind answering Dr. Reid?"

"No, not at all; and please call me Spencer." Spencer said with a smile.

Avalon smiled in return, taking out her notebook once more and a pen. "Why is it that these serial killers become who they are? What exactly drives them to this point?"

"Well, there are many conclusions as to why serial killers, well, kill. However, no one really knows why."

Avalon nodded, writing down his answer quickly. "And what do you believe that sets them off? What could be their stressor?"

Spencer crossed his arms, smiling down at the serious woman who was about three years younger than he was. "It could be things as little as their parents, or guardian, punishing them so they would punish them in return. Or it could be as big as being a victim themselves and as the years pass by they can develop to do more bold things–kill their victims. This could even happen if a victim had lived and had spread of what's happened to him."

Avalon nodded once more, scribbling away. "Well, some scientist believed that some serial killers have an unbalanced chemical within their brains. What would your opinion be on this, aside from what you just told me?"

Spencer smiled with a frown, quickly profiling the woman. "There could be some sort of unbalanced chemical in their brains that would make these serial killers do what they do; however, it truly has not been proven if such chemicals to make these people start killing even exist."

Avalon nodded, smiling as she looked up at Spencer, finished writing down his answer. "Thank you, Dr–Spencer–for letting me asked my questions and answering them. I'm sure you are very busy."

"Not at all, my plane doesn't leave until six tonight anyways, so I still have time to spare." Spencer told her truthfully.

He had already concluded that this woman, although shy and quiet, is very opened minded and opinionated in what she hears and sees. She also has the air of respect and some authority, which makes him believe that she was raised by someone in the military. He did notice her before during his lecture, and knew that the questions (although were not the ones she wanted to ask) were brewing in her mind towards the middle of his talking. She hates the attention and had waited to ask him after class–or even go as far as not to ask if her courage failed her at the last second.

Avalon held out her hand, smiling brightly. "Well, again, thank you."

Spencer shook her hand. "I'm sorry I didn't catch your name."

"Avalon Gibbs," she answered with a mysterious smirk.

Spencer frowned, wondering if he had heard right. "As in the mystical isle that was said Excalibur was forged and Arthur had traveled to heal his wound after his son, Mordred, had fought him and was never heard from again?"

Avalon laughed, nodding with embarrassment. "The very one; my mother...had a thing with the legend of King Arthur."

Spencer shrugged, smiling. "Everyone has its quirks."

Avalon smiled shyly, "Even you?"

"Even me," Spencer agreed, smiling.

With wide–more confident and flirtatious–smile, Avalon exited the large classroom, Spencer looking after her. After a few more minutes, the FBI agent walked out of the classroom, his eyes immediately going to the back of Avalon already a few hundred yards away. Biting his lower lip, Spencer took to running after her, his mind set in asking her for a quick bite to eat or even something to drink.

Outside, Avalon frowned at the crowd of people in the parking lot being held back by the police officers, a familiar truck nearby. Eyes widening with joy, the twenty-two year old ran across the yard, hoping that she would be able to speak to her father before letting him work and her go back to class. Taking out her phone, she speed dialed her father's number, smiling when he answered crisply and serious.

"You don't happen to be in the other side of the parking lot of my school, are you dad?"

Gibbs chuckled on the other line, standing up and turning to see his daughter running towards them. "Yes, we are. Hurry up and get over here,"

Father and daughter hung up, smiling widely at each other. However, as she went to cross the fairly large parking lot, a black van screeched behind the young woman, the van door opening quickly with a hard thump. Three men rushed out and took hold of Avalon, who started to scream for her father, her bag dropping to the floor.

"Daddy! Daddy!" Avalon screamed, kicking and punching at her attackers.

Leroy Jethro Gibbs eyes widen at sight before him. "Ava!" He yelled in panic.

Gibbs ran towards the van with his team in tow, the group firing their guns at the van. However, it had screeched away, Gibbs' heart beating as his eyes turned cold with icy hatred. Timothy McGee had just informed them that the body was just a dump stolen from the hospital–and a set up. That conclusion, however, was a little too late. Now the kidnappers were going to pay for taking his daughter, that, Gibbs would see to personally.

Gibbs turned to the scrawny man holding a gun of his own, the man breathing hard and looking after the black van with a confused and angry look. Pointing his gun at him, Gibbs quickly took him in, frowning with confusion and urgency.

"Who the hell are you? Put down your weapon!"

Spencer looked over to older man, his skin pale as his heart hammered against his chest and his eyes wide with fear and horror. As he had run outside, he had quickly taken in everything and saw the black van driving way too quickly towards Avalon. His voice had failed him, so Spencer took to running towards the van, taking out his gun and shooting at the tires in dire hope he would at least be able to blow out one. As he heard Avalon screaming for her father, the young FBI agent felt it was his fault she had just gotten kidnapped.

Spencer held up his hand, still holding the gun but with his finger off the trigger. "I'm a FBI agent. My badge is in my vest pocket–the left one."

Gibbs put away his gun and quickly moved forward as his team continued to point their guns at the man. He immediately found the wallet and opened it, scanning everything to make sure all was legit.

"He's okay." He told his team, handing the badge back as he glared at him. "What the hell are you doing here?"

Spencer gulped visibly as he put both his gun and his badge away, making Gibbs almost grin in satisfaction in seeing the young man scared of him. "I was giving a lecture that ended twenty minutes ago on the behavior of criminals and their actions."

Gibbs sighed, nodding, as he rubbed a hand over his face. "Right, I remember my daughter telling me something about that in the week she has found out about the lecture and had signed up."

Spencer frowned, quickly profiling the man before him. When his eyes returned to the serious, but amusing gray eyes, did the young doctor realize who he was related to. Avalon wasn't just calling out for her father because he had promised to protect her from everything, but because her father was really close by.

"You're Avalon Gibbs father,"

Gibbs raised an eyebrow, impressed with the young man. He went to question how exactly he knew when the young man's phone started to ring. Spencer excused himself as he fished out his phone. Gibbs only sighed and snatched up his daughter's school bag, wondering what the hell she had in there as it was heavy.

"Reid," Spencer frowned, "you're here, why?" He looked up at Gibbs, who looked back at him and raised a questioning eyebrow. "Well, you won't need to figure out if the unsub has taken anyone because he just did. I'm also standing with her father–Hotch; I do believe that we have come to a joint investigation with NCIS."

A/N: Kind of short, but it's only the first chapter. Please review and let me know what you think! Oh, and this chapter is dedicated to Keggers1023, who's her own crossover story, Who are you (fanfiction . net/s/5685288/1/), finally inspired me to write my own. Thank you.