Are You Gonna Be My Girl?

GC Set after S5 'Who Shot Sherlock?'. As soon as the words left his mouth Grissom knew that he shouldn't have said that. Now he was in deep trouble.

Chapter One: So 1,2,3 Take My Hand And Come With Me

Disclaimer: Let's see, I own my Muse, my imagination, my dreams, the fangirl in me and not a whole lot else. CBS I worship the ground you metaphorically walk on.

A/N:- Mainly set around this episode but it can really be set whenever there's been a Catherine/Ecklie moment. Yes it's out of OOC – blame my Muse.

Grissom walked down the corridor, trying to process everything he had seen and overheard to justify his argument. The smiles, the looks, even the intonation in her voice …. He couldn't get it out of his head.

"Catherine, have you got a minute?" Grissom asked, catching her coming out of the DNA lab.

"Sure. Nick's just wrapping the case." Catherine said. "What's up?"

Grissom motioned towards his office and shut the door. Catherine glanced at him curiously – he never ever shut his office door. She crossed her arms and leant against his bookcase, waiting for him to speak.

"Can I give you some advice from supervisor to supervisor?" Grissom asked, busying himself with tidying his collection of creatures on his shelf to avoid having to make eye contact with her.

"This ought to be good!" Catherine smirked.

"Just because you've been promoted doesn't mean you should feel the need to flirt with Ecklie to make sure you keep on his good side." He said matter-of-factly. "I never found the need."

Catherine's eyes widened in surprise. "I beg your pardon?" she exclaimed.

"I'm serious." Grissom said turning round to face her. "Flirting with the boss isn't you Catherine." He stated. "Which is a shame considering you worked under me for four years." He winked.

"Is this some kind of joke Grissom?" she questioned, hands on her hip.

He shook his head. "I'm just following the evidence and giving you some friendly advice."

"Wait a minute," she said, shaking her head. "You're accusing me of flirting with Ecklie?"

"Yup."

"And your reason for thinking this is …?" She questioned. She couldn't believe she was hearing this, especially from Grissom. What was the matter with him? It wasn't like him to throw accusations around like this.

"I heard the way you two were talking." Grissom said, waving his hands around, trying to justify his argument which he realised now was rather weak and consequently he was in very dangerous waters. Catherine already looked like she wanted to strangle him.

"Firstly I can't believe you think I would flirt with Ecklie." Catherine said, glaring at him. He was unbelievable sometimes. "Secondly I don't believe it's any of your business anyway. And thirdly ….. I still can't believe you think I would do something like that."

"I, just …"

"You think just because I used to be a stripper I use my sexuality to get what I want in life!" Catherine shot. She had got over her shock of hearing Grissom say that to her and now she was mad, real mad.

"No of course not." Grissom said, immediately wishing that he hadn't said anything.

"I can't believe you! I thought you knew me better than this!" Catherine exclaimed.

"I do … it's just the way you let him rest his arm lazily around the back of your chair ..." Grissom argued feebly.

"He wasn't doing anything wrong and it was such a small thing as well. He wasn't touching me…. Oh my God you were spying on me!"

"I was just passing. You were sitting so close together…"

Catherine raised her eyebrows. She allowed herself to fleetingly think some thoughts which she had banned herself from thinking ever again but she really did find jealous Grissom strangely attractive. "You and I sit close together all the time."

"Are you comparing our twenty years of friendship and closeness to what you and Ecklie have!" Grissom shot, wishing immediately that he could take it back.

"No, what we have is nothing like what Ecklie and I have because thus far, Ecklie has yet to ever accuse me of acting inappropriately with another colleague." Catherine said, thoroughly disgusted and spun around but in a matter of steps Gil was at the door blocking her way.

"I'm sorry. I was way out of line." He said humbly.

"Yes you were." Catherine told him and moved back into the room. "Still I suppose I can understand it. You wouldn't know real flirtation if it came and hit you in the face."

Grissom frowned. "What?" She spun round to face him, her long silky hair swaying as she moved. He loved it when she wore her hair down ….

Catherine rolled her shoulders back and pulled her blouse down and walked over to Grissom confidently. "If I was flirting with Ecklie it would go something like this …" A mischievous look crossed her face and alarm bells started going off in Gil's head but it was too late to get out. "So, Gil … I hear it's been a hard day …" She purred sweetly, her head tilted slightly to the side, her eyes travelling slowly up his body which made him feel like he wasn't wearing any clothes.

She could tell he was feeling uncomfortable and she hadn't even got started yet. She took a step forward and he moved back so she simply moved closer until he was backed up against the wall. "You really shouldn't work so hard." She said, her voice barely above a whisper whilst fiddling with his shirt collar before moving her hand slowly over his chest as if she were smoothing out the creases in his shirt. With one hand still resting on his chest the other moved upwards again and undid his top button. "You should take better care of yourself. Women really like that." She said, making eye contact, her tongue running across her bottom lip seductively.

Grissom knew what she was doing but he couldn't help falling under her spell all the same. Her eyes were sparkling; she was beautiful. "Catherine, what are you doing?" he gulped.

She always knew that men were putty in her hand but Catherine was surprised Grissom had fallen so quickly especially since he knew she was just doing it to prove a point. She closed the gap between them so her body was pressed right up against his. "Do you know what else women like?" she said softly, her breath tickling his ear. She felt a shudder run through her body. Aware that she was now crossing the line between flirting to tease him and flirting with him because it had always been an age-old fantasy of hers to do so, she softly nibbled on his ear.

"Catherine." Grissom mumbled but he made no effort to move away.

She could feel him smelling her hair and it took all the self control she could muster to keep up her act.

"Men who .." she started planting light kisses along his jawbone. " … take … control." She finished softly, gazing deeply into his eyes before brushing her lips against his, lightly at first to tease him, to give him a chance to push her away … but he didn't and she slowly made it less chaste.

When she finally pulled her lips away from his, he looked at her searchingly. Her eyes were clouded slightly and for the first time he saw the Catherine Willows who wasn't in control of her emotions. She was scared of what had just happened. But as soon as he observed it, she seemed to regain her confidence.

"And that is what would have happened if I was flirting with Ecklie." She said quietly, aware that they were still standing so close to each other.

Gil didn't say anything – he didn't know what to say and he wouldn't have been able to say it even if he did. They just stood there staring at each other, her hands still resting lightly on his chest for a long time.

Suddenly Grissom's office door flung open and Greg walked right in. Catherine quickly took a step back and dropped her hands which didn't go unnoticed by the younger CSI.

"Oh, I'm sorry." Greg said quickly.

"Knock next time Greg." Grissom told him sternly.

"I'm sorry. I can come back." He said, about to head back out.

"No it's okay. I was just leaving." Catherine said quickly and left without another look at Grissom.

Greg looked at his boss curiously. "What was going on? You never close your door."

"Nothing. It was nothing." Grissom said, clearing his throat and taking a seat at his desk.

"You and Catherine? Way to go boss…" Greg grinned.

"Greg." Grissom said seriously.

And Greg knew when to drop it and started going through his case findings.

A/N:- More to come soon. Reviews and comments make me happy.