A/N: Alright my darklings! Here is chapter 4! And you little horndogs, I know you're waiting anxiously for the big moment, and i can only assure you it's coming... as soon as I know you want it as bad as Cat and Sara do! :) Hahaha.
And I must say, I am personally rather pleased with this chapter, so I am interested to hear your thoughts on it :)

God damn, Nick, Sara thought. Damn him!

She was having a perfectly good time making Catherine squirm. Then he just had to go and call attention to the fact that her face was flushed, grinning like he'd just solved a fucking million dollar puzzle. And Catherine just had to use that sensual voice on her, making her blush to begin with. Damn Catherine Willows too, while I'm damning people… damn Nick for being a smart-ass, and damn Catherine for… having a sexy ass!

Sara continued to damn Catherine and her sexy ass as the woman bent over to pick up a shell casing from the pavement. Bent over at the waist. Sara was sure that just had to be to torment her. Who bends over like that to pick something off the ground? And is she even wearing pants? Or does she just spray-paint them on every morning? Sara wondered as she tore her eyes away. She focused her attention on loading the rest of the evidence into the boxes.

"Sara. Sara… Hey, Sara!" Catherine's exasperated voice finally registered in Sara's ears.

"What?" she snapped back.

"Uh, I said you're name like, a hundred times," Catherine quipped.

Well, maybe I could pay attention better if you weren't shoving your spray-painted ass in my face!

"Don't exaggerate, Catherine," Sara said flatly.

"Whatever. Are you ready to go, or should I grab my sleeping bag and set up camp for the night?"

Sara sent Catherine her squinty-eyed glare, then smirked.

"No, no. I'm ready. Besides, I think this is far too public an area for you and your 'nightly activities."

Catherine's eyes and mouth popped open simultaneously and then froze, her clear blue eyes following Sara as she stood.

"Close you're mouth, Catherine," Sara said, turning and walking towards the Denali to hide her growing smirk. "It's not attractive on you."

Sara stuffed her evidence in the trunk, then settled herself in the passenger seat, as a fuming Catherine took her place behind the wheel. They drove in silence a while, as Sara reveled in her victory over Catherine. She knew she shouldn't, but she couldn't resist prodding Catherine just a little more.

"You know, Cat, it's nothing to be ashamed of," she said in a mock-comforting tone. "Everybody does it." Her confidence began to fade as she saw the corners of Catherine's mouth curl slightly.

"Oh, really?" Catherine retorted, feigning shock. "Good to know. So, when's the last time you did it, Sidle?"

Sara's jaw hit the floor.

"At the lab?" she practically shouted, genuinely shocked.

As Catherine broke out into an all out grin, Sara knew; she definitely shouldn't have pushed her.

"Well, well," Catherine jeered. "I was speaking more generally. But since you brought it up…"

"That's your thing, Catherine," Sara cut her off, fully aware she was lying through her teeth.

"No need to get so defensive, Sara. 'Everybody does it," she mocked Sara's earlier jab.

"Yea, well, not all of us feel the need to fuck ourselves at work!" Sara snapped in embarrassment. She didn't like this game anymore.

"Fuck you, Sara. I was teasing," Catherine retorted, obviously getting annoyed herself, then muttering, "you have to make everything so fucking personal."

"Mind your own business, Catherine."

"Learn to knock, Sara!"

"Oh, so now it's my fault that you decided to stick your hand down your pants without locking the door?" Sara shouted.

"My hand was not down my pants!" Catherine defended herself.

"Might as well have been! What'd I miss that one by? Thirty seconds? Fifteen maybe?"

Is it wrong that this fight is completely turning me on? Sara wondered, beginning to notice a slight aching in her pants. Could she help it that an angry Catherine was also a very sexy Catherine? With her flushed cheeks, her heavy breathing as she tried to keep from losing her cool… Not so different from the way she looked when I busted her…

"Fuck you, Sara," Catherine spat.

"Fuck you, Catherine! Oh, my bad, you've got that one covered."

With that, Catherine slammed on the breaks, ignoring the screaming horns of the cars that swerved to dodge her. She turned, waving a very angry finger in Sara's face.

"I warned you not to mess with me, Sara," she said through gritted teeth, "I will get you back."

"And I told you: I. Can't. Wait," Sara said defiantly, getting right in Catherine's face. They engaged in several moments of a staring contest, before a particularly belligerent horn snapped them back to reality. Catherine put the car back in motion, as they made their way back to the lab in silence, the tension so thick you could cut it with a knife and smear it on toast.

I really need to learn to keep my big mouth shut.