A/N: Just a little idea that popped into my head. Meant as a one shot, but could be expanded. Let me know what you think!

Constant

"What's got you musing?" JJ asked as she watched her friend on their journey back towards Quantico. She was concerned for the younger man, she could see his brows furrowed and the fact that he hadn't turned a page in a full five minutes told her something was definitely occupying his brilliant mind.

"Hmm?" Was Reid's response as he looked up at her, forcing a small smile. "Oh, I was just thinking," he deflected, closing the book and putting it on the small table. "Why?"

JJ smiled genuinely at him, "I can see something is bothering you Spence, you know you can talk to me about anything, right?" She asked, looking deeply into his hazel eyes.

Reid looked down for a moment, forced to by her intense stare. It was sometimes very hard to maintain eye contact with her because sometimes it felt as if her blue eyes could see right through him, right through every white lie, right through every word left unsaid. He let out a deep sigh before looking back up at her, "I miss him," he said softly, giving her a small sheepish smile and a shrug.

JJ's gaze softened a little. Derek Morgan leaving the team had been hard on all of them, but especially hard on Reid. He'd viewed the man as a stable person in his life, an older brother he could always go to for advice. The team was changing rapidly and JJ knew it was only a matter of time until another member would either join or leave the team.

"We all do," she said gently and waited until he looked into her eyes again, "but that's not all, is it?" She asked gently.

Reid let out another sigh and swallowed the lump in his throat. "It's not, but this is not the right time and place," he said, hoping she would understand and leave the topic alone for now.

JJ nodded, understanding, "Soon though, right?" She asked.

"Soon," Reid confirmed and grabbed his book again, attempting to focus his mind on the story. It wasn't working, so in the end he decided to give up. He grabbed his jacket, bunched it up and used it as a pillow as he closed his eyes, worry still rushing through his body.

It had been several days since their short talk on the jet and they hadn't had time to get together and talk about it, to great frustration of JJ. This afternoon Reid had quickly left work, as if to make sure she wouldn't be able to catch him and talk. She sighed as she rinsed her coffee mug in the sink of the break room, ready to call it a day herself. If he wasn't going to come to her to talk, she would have to go to him.

After making sure her mom would be able to look after Henry and Michael for the night, she decided to head straight to Reid's apartment. Once there she got out, a little uncertain of how he would react to seeing his coworker at his door on a Friday night. She shook her thoughts and headed upstairs. She knocked at his door and waited.

"JJ?" Reid asked as he opened the door, he wanted to ask her why she was here, but he already had a feeling it had something to do with their conversation on the jet a couple of days earlier. "Come on in," he said and stepped aside.

As usual there were books everywhere and JJ smiled a bit to herself, some things never changed. She grabbed a few books from the couch and placed them on the coffee table so she could sit down. "You were in quite a hurry to get out of work, huh?" She asked as she waited for him to sit down in the recliner.

Reid nodded, slightly uncomfortable, "I think I was trying to avoid the inevitable," he said as he nervously looked down at his hands. "You wanted to know what was going through my mind on the plane, aside from missing Morgan," he said.

JJ smiled and gave a small nod, "You said you'd talk to me soon, I didn't expect I'd have to hunt you down for you to talk to me," she teased slightly and waited for him to continue.

"It's just that… everything is changing and I'm having a hard time adjusting to it all," he admitted, looking down at his fiddling hands. "And even though I know Morgan didn't walk out of my life, I can't help but get the same reaction I did like when my father left and then Gideon… and Emily."

JJ winced a little at the mention of their friend's name, she knew he had forgiven her and Hotch for what they had had to do, but it still hurt to hear him mention it. "You can't help but feel like people are leaving you," she said, waiting for his nod.

"I'm not sure how much longer I can deal with people leaving JJ," he admitted, his voice sounding small and on the brink of emotion pouring out. "What if Hotch decides he wants to spend more time with Jack and leaves?" He asked. "What if…" he started and took a deep breath, "what if you leave?" He asked, revealing the true point of his fear.

"I'm not going to leave Spence," JJ was quick to answer, waiting for him to look up at her.

"You can't promise that, and it's okay," Reid responded, looking into her eyes for a little while before back down at his hands. "I know Will wants you to be at home more, especially now with Michael."

JJ got up from the couch and moved over to the recliner. She kneeled in front of him so she could catch his eyes which were looking down at the floor. "I'm not leaving Spence," she said again, "I need money to provide for my boys, so I will continue working."

"What if Will wants you to quit? He can provide for you so you can be a stay at home mom," Reid replied, making himself look into her eyes.

"That's not going to happen, Will and I aren't together anymore," JJ replied gently. She swallowed the emotion rising in her throat at her statement, it was still fresh.

Reid's eyes widened and his head shot up somewhat, "What? Why didn't you tell us?" He asked. "Are you okay?" A million questions ran through his mind right now, but he needed to calm himself down, give her time to answer.

"It's only recently, but it's okay," JJ said as she wiped at her eyes. "It was a mutual decision. My mom is staying with the boys so I can go to work when I need to. Will and I have to work out the details, but we're getting a divorce."

Reid nodded a bit, soaking up the new information. "Wow… are you sure you're okay?" He asked.

"I am, and I know I will be because I have one constant in my life and that's you. You're always there for me and I will always be there for you. I will be your constant."

TBC?