A/N: Since it has been said (by William Peterson of all people), that Grissom lives his life in his mind, I thought it would be interesting to be inside his mind as he discovers Nick and Sara's new relationship.

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Grissom was in a foul mood. Last night everyone had doubled up on cases because both Nick and Sara had the night off. Not that he begrudged his people time off, they both needed it, they had worked too many nights in a row to not take time off. He just had the sheriff chewing on his ass because his team didn't respond as quickly as he wanted. Sheriff Mobley always put Grissom in a foul mood. It didn't matter how many times Grissom told Mobley that science took time, Mobley would always inevitably respond that time was not something they had in a case of such importance. That was the problem, in Vegas, too many high profile people were involved in things of ill repute. Sin City. It was aptly named. People flocked here and left their morals behind. It gave Grissom and his crew the opportunity to solve crimes that would baffle other forensic experts. They weren't the number two lab in the country for no reason. Still he was in a foul mood. He had hoped that the team would assemble early so he could give out assignments and go back and finish the paperwork the sheriff wanted.

Grissom was in the break room looking for coffee. As he took a sip he could tell that Greg was already at work, the coffee tasted good. Warrick sauntered in looking a bit subdued, perhaps with something on his mind. This wasn't unusual, Warrick tended to be a bit more tight lipped about his personal life than the rest of the team. Not that the rest were forthcoming about what they did after hours, but Warrick more than the rest seemed to guard his privacy.

Nick, Sara, and Catherine arrived in the break room about the same time. Catherine had a slightly amused look on her face and Grissom raised an eyebrow at her to see if he could read her expression. She shrugged her shoulders with a smug expression on her face that indicated that he was going to have to figure it out himself and it had nothing to do with her.

The group of CSIs chattered away about nothing in particular. Warrick and Catherine filled Nick and Sara in on what had transpired the night before.

Nick looked happy. Then he always was more outwardly cheery than the rest of them. Although his exterior might often belie something deeper going on. He was definitely one of the more sensitive ones on his team . He worked well with everyone on the team, but he and Grissom tended to butt heads at times. Nick might think that Grissom didn't think he was a good CSI, but in reality Grissom knew he could learn more and be better at his job. Grissom knew he had potential and he wanted to push him to achieve that potential.

Sara looked different. Grissom raised an eyebrow, studying her as he sipped his coffee. She took a seat next to Nick at the table in the middle of the break room. Hmm. There was something about her. He sipped his coffee again. The shirt. Grissom tried not to choke on his coffee. He narrowed his gaze at her without being too obvious. He could swear he saw Nick wear a shirt just like it a few days ago.

He glanced over at Nick. Nick kept glancing at Sara and smiling. Grissom looked at Warrick and Catherine. The two of them wore bemused grins on their faces as if they were privy to information that he didn't have. Catherine caught Grissom looking and smirked at him. Grissom gave her a half smile and glanced back at Nick and Sara. He caught Catherine smiling out of the corner of his eye. Hmm. There was definitely something going on. He just wasn't sure what that was yet.

Something about the way Sara kept looking at Nick triggered something in Grissom. The pieces of the puzzle seemed to suddenly fit together. Nick and Sara were together. He wasn't sure for how long, but they were definitely together. He took another look at the shirt Sara wore. A half smile crossed his face as he took another sip of his coffee. It was Nick's shirt. The top button was missing. Grissom remembered that Nick made a comment about it at a crime scene they were processing a few days ago, when he had seen Nick wear the shirt. Nick chuckled about poor workmanship because the shirt was new. As Grissom watched, Sara reached under the table and squeezed Nick's hand as the group shared a joke. Nick grinned at her and Grissom could see him squeeze her hand in return. He was glad. Sara and Nick deserved to have a life. They logged far too much overtime each month. It could be complicated though. He'd have to watch them closely and make sure they didn't act unprofessionally at work.

Grissom glanced over at Catherine before putting his coffee cup in the sink. She could tell that he had figured it out and raised both of her eyebrows at him with a conspiratorial smile on her face. He cocked his head slightly and shrugged his shoulders giving her a half smile. Years of being friends and working together had allowed them to communicate like that.

Grissom joined the group at the table and handed out assignments.