DISCLAIMER: I do not own anything related to CSI:NY.

A/N: Another short Flack/Aiden fanfic by me. Got bored so I decided to write this up. Apologies if it's off.

He watched as she entered the break room. Her face was set straight, serious and very I-don't-give-a-damn. Her usually soft dark brown eyes had a steely glaze over them. Her hair was tied up in a high ponytail, very different when she let her hair loose. Her figure was being covered by a white lab coat which hid all her curves. At work, Aiden looked very different.

Flack longed to stare into her eyes. He longed to release that stupid elastic band which was holding her hair up in that ponytail and run his fingers through her hair. He longed to remove that lab coat and, well, his mind was already in the gutter when he thought about that.

He continued watching her. She was holding a paper in her hand; probably a lab test result or something. She was talking to Stella and showing the paper to her. Stella nodded a couple of times, took the paper from Aiden and walked out of the room.

Aiden sighed in what looked like relief and made herself a cup of coffee. Flack noticed that even when she was doing something so simple, she looked as if he could just take her right there and now. But no, Flack was a gentleman, and gentlemen don't go over to their girlfriends and fuck them right there, especially at their work place. He had to conceal a sly smile at the thought of him and Aiden getting their groove on in an interrogation room, especially if someone like Mac walked in on them.

Then Danny came and talked to Aiden. He said something which made her looked amused but annoyed at the same time. Then she smacked him on the arm and he pretended to wince in pain. After that she walked out of the room. Danny noticed Flack and walked over to him.

"You're terrible at hiding your feelings," said Danny.

"What?"

"It's obvious that you wanna do her."

"No I don't."

"Stubborn ass. Anyway, I have to go now. Mac and Hawkes have something in the morgue for me."

Flack watched as Danny walked off. Suddenly Aiden came back into the room, walked towards Flack and sat down next to him.

"I thought he'd never leave," Aiden muttered.

Before he could question her, she pushed him so that she was on top of him and kissed him. He responded and kissed her back willingly. He ran his fingers towards the elastic band which was holding her hair and removed it. He then ran his hands through it. He caught a whiff or her perfume which smelled like vanilla.

After a few minutes, Aiden climbed off him and stood up.

"I'm not complaining but… what was that for?" asked Flack.

"You stare too much."

Flack looked quizzically up at her.

"Please, Don," she said, adjusting her clothes. "You didn't think I noticed you staring at me? I could tell you were fantasizing."

"Pretty risky of you doing that here. Aren't you afraid of someone walking in on us? We could lose our badges if someone did."

Aiden shrugged. "C'mon, Don. Live a little. Besides, Mac and Stella are busy with the case. Didn't you see Stella take that paper from me?"

She grinned at him and Flack realized it. He grinned back at her.

"You naughty girl," he said.

"It's one of the many things you love about me," she said smugly. "I'll see you later tonight, Don. Who knows? Maybe tonight we might finish up what we started."

She winked at him, smiled and walked out of the break room. Flack smiled to himself.

"I saw that," said a familiar voice.

Flack turned and saw Danny standing against the door frame, grinning and adjusting his glasses.

"You two are terrible," said Danny.

"Shut up."

FIN