DISCLAIMER: I don't own any of the characters. They all belong to male genetalia aka Dick Wolf.

A/N: This was supposed to be a one shot, but I've decided to add a few more chapters.

It had been almost a week since Nick and Olivia had slept together. Although there had been no repeat of that night, things were going well with them. They had lunch together every day at work and gradually started to get to know each other better.

"So let me get this straight, you don't drink coffee and you don't eat donuts...are you sure you're a cop?" Olivia said as they sat in their usual spot at Donna's diner.

Nick laughed. He wasn't sure where things were going with him and Olivia or how this was going to affect their jobs, but right now he didn't care. He loved spending time with her and seeing a side to her he didn't get to see often. She would never let anyone know it but Olivia Benson was just as goofy, girly and vulnerable as any other woman and Nick loved that. Sure badass Benson was a turn on, but cute and goofy Olivia was the woman he was falling for. Damn he was screwed.

Olivia was never one for letting her guard down with anyone. Her upbringing and her job probably had a lot to do with that, but with Nick she felt different, he made her feel different. She felt she could be herself around him and not be judged. Most of all though, she felt safe with him.

It was just after 10PM in the precinct and everyone had gone except Olivia and Nick who had a mountain of paperwork to finish.

Nick was sat at his desk staring at Olivia who was engrossed in her work. They had been working together for over 2 years now, but still her beauty mesmerized him just as much as it did the first day he met her. She had her hair curly today just the way he loved it. It made him think back to the night they spent together when he had his hands running through her hair while she moaned his name. It made his dick twitch just thinking about it.

Olivia looked up from her paperwork to catch Nick staring at her. He seemed to be daydreaming because he didn't notice she was now staring at him.

"Earth to Nick...Hello" she said as she waved her hands in front of his face.

"Oh, sorry." Nick said, looking down at his paperwork slightly embarrassed that she had caught him staring.

Olivia took that moment to really look at Nick. His tanned skin, dark hair and those beautiful lips. She thought back to the night those lips were on hers kissing her. She had to hold back a moan. She wanted him and she wanted him now. She looked around to make sure there was no one else around, as she stood and walked over to him.

"Everything okay, Liv?" Nick asked, looking up at her.

"No, I'm not okay, I need you now, Nick" she said, as she pulled him up from his chair by his tie and kissed him with as much force as she could.

Nick was taken aback he definitely wasn't expecting that. He knew he shouldn't because they were at work in the middle of the bullpen and anyone could walk in at anytime but feeling her lips on his he couldn't help himself as he kissed her back. Picking her up and sitting her on his desk, their tongues fighting for dominance, as he ran his hands through her hair. He couldn't help but become aroused as she she moaned into his mouth. He pulled her closer to him so she could feel exactly what she was doing to him. The moan that came from her drove him crazy and he almost came right there in his pants. He began to softly kiss her neck as one hand travelled down her body, giving her breasts a slight squeeze, she arched her back trying to push her breasts even further into his hand. Just as his other hand slipped into the front of her slacks and inside her lacy panties. He let one finger slide along her slit feeling how wet she was. He couldn't believe how wet she was already and all for him.

"God, Nick..I need you, now." Olivia moaned ito his ear.

That pushed him over the edge. "Turn around, now." he growled.

As Olivia complied, he hand his pants and boxers down in record time. His rock hard member more than ready. As he looked at his partner bent over his deck waiting for him, he lost all self control he ever had as he pulled her slacks and underwear down and entered her hard.

Olivia let out a yelp as he filled her. It was pain mixed with pleasure. Nick was worried he had hurt her though. "I'm sorry, baby. Are you okay ?" he asked concern filling his voice.

"I'm fine, don't stop. Nick..please." she whimpered.

At her words, he started to rock slowly in and out of her. He loved the feeling of how tight and wet she was. He definitely wasn't going to last long, not in this position.

Olivia couldn't believe she was doing this. Fucking her partner, bent over his desk in the middle of the bullpen but she needed him and it felt too good for her to stop it. As Nick started to thrust harder and faster into her she gripped on to the corner of the desk for support and had to stop herself from screaming.

"Yes, Nick that's it...oh, fuck." she whimpered, as Nick drove himself furiously inside of her.

Nick felt himself about to fall over the edge. This was the hottest thing he had ever experienced in his life. His head fell back as he savoured every moment.

Soon, he felt Olivia starting to tighten around him, he reached around and rubbed her clit while still pounding into her. Olivia came undone at that moment, she let out the scream she had been holding as she exploded around him. Nick followed right after exploding inside of her and collapsing on top of her.

As they both tried to steady their breathing, Nick kissed Olivia's neck up to her ear and whispered "I love you, Olivia Benson.". Suddenly he felt Olivia stiffen up and he soon realized he had made a big mistake as she pushed him off her and started to get dressed. Not looking at him or saying a word. Before he knew it she was dressed and running out of the bullpen.

"Olivia, wait." he shouted after her, but it was no use she just kept on running.

"Damn it, Nick..what have you done?" he said to himself as he started to get dressed.

A/N: So what's going to happen ? Will Olivia keep running from Nick or will she give them a chance? Stay tuned.