"Hey Gris," Nick started. The older man turned to look at him. "How's it goin?"

"It's going great, Nick, thank you," He went back to preparing himself a cup of coffee.

"Seriously, you can talk to us." Warrick insisted.

"What are you guys talking about?"

"You just haven't been yourself." Sara pointed out, "And a sudden upbeat mood is usually a sign of depression."

"Well, I like that!" Grissom scoffed, "Someone's mad, they're depressed. Someone's sad, they're depressed. Someone's happy, they're depressed. Can't a person just be HAPPY?"

"You can't." Greg said bluntly. Grissom glared at him.

"So, you're really fine?"

"I am better than fine, Sara. I am great!" He exclaimed.

"Why?"

"I know why." A muffled giggle sounded from the back of the room and everyone turned to see Catherine sitting on the couch watching the scene unfold.

"Why?" Sara asked again, this time of Catherine.

"Our Dr. Gil Grissom. . ." she bit her tongue to stifle a laugh, "Has a girlfriend."

The CSIs immediately refocused their attentions on Grissom. A few jaws were open in shock, but one thing can be said of them all; they were speechless.

"Oh close your mouths." He scowled, "You're brats."

"Tell them about her." Catherine prodded, smirking.

"You've met her?" Nick asked.

Catherine shrugged, "Once or twice. She's a real joy. I like her."

Grissom shook his head, damn did Catherine like to see him twist in the wind. "Ok, she's really smart."

"What do you mean really smart? There are so many kinds of smart!"

"Ok, she's really book smart. She reads a lot, whenever she has time. She's great with kids."

"How old is she?" Warrick asked.

Grissom stopped to think for a minute. He could get his revenge while answering this question. Grissom opened his mouth to speak, noting the pointed look he was getting from Catherine, "Forty-nine." She coughed. "Ok, ok, she's fifty."

She stuck her tongue out at him. "Gil, you're so stupid, she's only thirty-nine!"

"Forty-one." He corrected her.

"She doesn't look a day over thirty." Catherine grumbled.

"She's got gorgeous blue eyes and she has a perfect figure. I'm with her because I enjoy her. Age has no bearing."

"Tell them what she's like in bed." Catherine grinned at the blush in Grissom's cheeks.

"Yeah!" Greg exclaimed, "How is she in bed?"

"She's an expert, she's really great at what she does." Grissom said embarassed, "But she likes to toot her own horn." He added. Catherine smiled.

"And I'm sure she has no complaints, either."

"Ok, ok, guys this is enough about my sex life. Let's get back to work." Grissom ordered pointedly.

"Tomorrow we can talk about Sara's sex life." Catherine laughed.

"Yeah right," Nick laughed, "What sex life?" He continued to laugh until Sara punched him in the shoulder, "Ow!"

Greg let the door close behind him. Catherine and Grissom stood alone in the breakroom. They remained silent for a long moment. It was Catherine who broke the silence, "You're going to get it for that fifty stuff!"

"You're a brat."

"Me?"

"Yes, you." He pulled her into an embrace. She giggled as his hands played across her ribs, expertly locating her ticklish spot. "All that stuff with telling them I had a girlfriend. I thought we weren't going to tell them."

"I didn't tell them it was ME," She pointed out.

"Think they'll put it together?"

"They will if you don't take your hand out of my pants." She smiled, "Not that I'm complaining. I'd love to rub it in Sara's face! I really REALLY would."

"I'm sure you would." He pulled her close again and leaned his head against hers, "I love you, I really do."

She smiled, "I'll never get tired of hearing that." She kissed him quickly, "I love you, too."

Grissom was sitting at his desk, filling in some paperwork. He looked up when his door was opened and Catherine sauntered into the office. She locked the door behind her.

"What are you doing?"

"Girlfriendly things." She winked.

He pushed his chair away from his desk. She climbed up on his hips and straddled his hips. He groaned as she brushed against his crotch. He gripped her thighs. She pushed at his hands, "House rules, no touching."

"It's my office," he ran his hands up her chest. She moaned and thrust her chest into his hands, "Office rules, my hands go anywhere they want."

"And mine?" Catherine's hands slid down his chest and started to undo his button, "Am I allowed to touch?"

"Anything you want."

She continued to free him from the confines of his pants. "Anything?" She slid her fingers around his erection.

He groaned, "Anything. . . Just don't stop!" She leaned down and took him into her mouth. "Oh God, Catherine!"

Catherine's tongue swirled around the head of his shaft. His hips bucked. Catherine continued to slowly circle his erection with her tongue. Catherine purred and Grissom's hip bucked against her mouth again. She arched her back with a moan, Grissom bit his lip to stop from crying out loud. "Catherine," he hissed, his eyes rolling back in his head.

She took him deeper into her mouth. She felt Grissom's throbbing erection expand in her mouth. She groaned as he bucked against her again, "I'm so close. . ."

She continued her exquisite torture as she felt him shudder underneath her. Unable to control himself anymore, his orgasm took over his body. His whole body trembled as he emptied into her mouth. "Catherine, I love you!"

"I love you, too." She leaned down and kissed him.

"Catherine," he held her hips tightly, "Don't move."

"Why?" She whispered, confused.

"Because, the wall of my office is glass and the blinds were NOT drawn,"

"What?" Her breath caught in her throat.

"Yes," He said slowly, "And we're not alone."

She looked over her shoulder tentatively. Standing in front of the window was Nick and Warrick stifling a laugh, Greg grinning broadly and Sara horrified.

"Think they've. . . put it together?" Catherine asked turning back to Grissom.

"Maybe."

She couldn’t stifle her smile and she laid her head down on his chest and started to laugh. Turning her head at an angle where she could look back at the kids and waved.

"Oh my god!" Greg finally exclaimed, "Grissom's cheating on his girlfriend with Catherine!"

Sara, Nick and Warrick glared at him and walked away, "What?" He demanded following after them, "What'd I say?"