A/N: Big thanks to LostForeverInHisEyes. I have altered the rating but will probably change it back if I need to. I will also be changing Deaks to Deeks. So any and all reviews are most welcome.

Cameron didn't sleep well but at least she slept. In her dreams she altered between dreaming about Callen and dreaming about the life she had created back at the house. As she dressed she built up the walls she would need to act like she didn't like Callen as much as she did. By the time she got to work she had decided she would be going out for a drink afterwards. Turning off the engine she pulled off her helmet and let her hair fall out over her shoulders. She schooled her face into what she hoped was a mask of indifference. She looked around and she saw the black Challenger and a silver 4x4 she didn't recognise. She climbed off her bike and walked into NCIS. Because she was walking with her head down she didn't see the figure standing in front of her until she collided with it figuring it was one of the team she muttered an apology and went around it without looking up. It wasn't until she recognised Callen's trainers that she actually took in her surroundings. She looked up and saw that he was smiling.

"Why are you so cheerful this morning?" she asked him, immediately suspicious. Callen wasn't known for smiling first thing in the morning.

"You should have seen Sam's face when he saw Nate. I mean I knew he was scared but I didn't realise how much. Maybe I shouldn't have teased him about it when he first told me." Cameron looked left and right and then asked,

"Where is Sam?" Callen pointed over her shoulder and she turned to look, there he was sitting at his desk as white as a ghost. She turned back towards Callen with a raised eyebrow, "What did you do to the Big Guy?" Callen shook his head,

"Not me. Nate. You do know its Halloween right?" Cameron let her head drop and groaned, "You ok?" he asked her.

"I hate Halloween." She muttered.

"Why?"

"I just do. Something to do with my very private fear." She lifted her head and looked at Callen, "So what has Nate dressed up as that would scare Sam?"

"Take a look." Callen replied pointing over her other shoulder this time. Giving him a suspicious look she turned around. In the two seconds that it took her to realise what she was looking at she lost all of her colour. Holding her hand out and trying to find Callen she waved her hand behind her without actually looking for him since she couldn't take her eyes off Nate. When she finally found Callen's arm she gripped it with her left hand and started to pull him towards her, when he was level with her she pulled him in front of her and then gripped both of his arms with her hands and she cowered behind him still unable to take her eyes off Nate.

Callen knew there was something wrong the second he saw her hand shoot out and start groping thin air, he wasn't ready for it when she found his arm and gripped it. When she pulled him in front of her, her grip on his arm was like a vice but when she added her other hand and she was cowering behind him he understood what her fear was. He could feel her warm breath as she literally breathed down his neck and she was that close he could feel her trembling. He looked down at her hands and they were white they were gripping him that hard. Privately she was hurting him but he would never admit it. Ever. He looked behind him but he couldn't see her and then her turned to Nate,

"Guess it's not that uncommon. Go change." Nate nodded and went to walk past her when Callen said, "Not that way! Go the long way I need to get her to sit down." Nate walked away and Callen shook his head, "He's gone. Come on lets get you into a seat." He whispered he started to move and she moved with him as he entered the bullpen he suddenly felt the blood rushing back into his hands. He looked around and saw her sitting in the corner with her knees pulled up and her head was in her hands as she hugged them. He stood and watched her for a little while. He frowned every time there was the slightest noise or she heard footsteps she would clench up more. Sam looked down at her and then looked at Callen,

"See! I told you!"

"Alright. You know I've come across this situation before." Sam looked at him,

"When have you come across a hysterical female?" Callen just looked at him and then he added, "When it comes to clowns?"

"Once but it was a long time ago. I'm trying to remember but I'm not really sure." Callen frowned and sat down behind his desk. A few minutes later Kensi and Deeks walked in,

"What's up with her?" Deeks asked pointing to Cameron in the corner.

"Clowns." Callen answered. Deeks kneeled down in front of her and touched her hand, what happened next no one was prepared for it. All they saw was Deeks touch her hand and in the next second he was flat on his back holding his left eye.

"What the Hell happened?" Callen asked as he approached Deeks.

"She hit me!" Deeks replied as he sat up.

"Well you shouldn't have touched her." Sam replied from his chair.

"Well she can't sit there all day." Deeks said looking at Cameron and then backing away some more. They all turned to stare at him,

"He is right Mr Callen. She could catch a cold." Hetty said from behind them all. Callen looked around,

"Well who's going to try and move her?" they all moved away from him and looked at him as if he was stupid but Sam just sat in his chair and laughed at him,

"I guess that means you G."

"I'd rather sit on a live grenade." Callen muttered as he perched himself on Sam's desk.

"You'll be fine she likes you." Callen rolled his eyes and then lowered himself so that he was sitting on his hunches. He carefully reached out with his hand, and ignoring the lightening, he said,

"Cameron? We need to get you off this floor. Can I come over?" he asked her. He could feel her relaxing and she slowly lifted her head and since the incident Callen could actually look at her. Her eyes were like saucers; he could just make out her pupils. Cameron was just looking at him her fear etched into her face. Taking her hand he pulled her up onto her feet. When she got to her feet she grabbed his hand as he led her towards the little couch that he had often fallen asleep on before he got his apartment, and she flopped down.

"How are you feeling?" he asked her. She moved her hand in a so-so manner. She shivered, "You cold?" she nodded. He stood up and then a blanket appeared out of nowhere. "Thank you Hetty." As he wrapped it around her shoulders Cameron smiled at Hetty and Hetty nodded her head ever so slightly. No one had realised that Nate had reappeared until he said,

"I have never heard or seen a reaction this severe before."

"I'm coulrophobic." Callen looked to everyone,

"Anyone know what she just said? Where's Eric?" he asked.

"She said I'm coulrophobic." Eric replied as he entered the bullpen. Then everyone turned to Nate,

"I've heard of that but I've never actually met anyone who suffered from it. She has a fear of clowns and Sam so do you to certain extent. But hers is obviously an extreme fear."

"Maybe she should go home Mr Callen. She is clearly going to be of no use to us today." Callen nodded and Cameron stood up and practically ran for the door.

"Guess she's in a hurry." Callen muttered, "I'll be back shortly." He ran after Cameron and found her leaning against his 4x4. He grinned and opened it. An hour later he was back at NCIS.

"Is she ok Mr Callen?" Hetty asked him.

"Yeah. She jumped out of the car and I followed her up and made sure she had locked her door etc. She's obviously jumpy." Hetty nodded and left.

"So do you remember who the other hysterical female from your past was?" Sam asked and Hetty stopped to hear his answer.

"Kind of." Callen replied.

Flashback:

Callen walked out of the wide doors and groaned, he hated Halloween; he would probably have to take his little sister trick or treating. He groaned again.

"What are you so happy about?" a voice asked from behind him. He smiled as he saw his only friend come outside. She was quite tall with long blonde hair.

"Cassie I'm just coming to realise that I may have to take my sister trick or treating. I just hope she doesn't expect me to wear tights, or leather, or anything other than what I'm wearing now." She smiled and linked her arm through his.

"Come on. Let's go home."

"What are you going to dress up as to take your brother trick or treating then?" Callen asked her.

"I don't do Halloween. I'm going home and then hiding in my room." Cassie replied. Callen gave her a funny look. "I have a fear of clowns. Evil things." she shuddered and quickened her step.

"Hold up Cass." She slowed down with a roll of her eyes.

"Hurry up Greg." She moaned.

"Why do you call me Greg?" he asked her. He had wanted to ask her that since she had started to call him it.

"Because G is a letter not a name. So I made one up. I could change it if you don't like it." Callen had the sudden mental image of her calling him something evil and then replied,

"No Greg is fine. Just don't expect to get a reaction every time." She nodded. They walked in a comfortable silence and as they neared her house she tensed.

"Great." She muttered. Callen frowned, standing in front of her house were three boys dressed as clowns. He could feel her starting to shake.

End flashback.

"She pretty much had the same reaction as Cameron. She didn't speak for about a week afterwards and she had trouble sleeping. When she did speak it was to be horrible to someone. So be prepared just in case Cameron is the same." Callen said as he finished his story. Hetty smiled and then carried on towards her office.

A/N 2: Sorry about the slow update. Had some Internet issues. Thought I would do it for Halloween. Made up the Callen back-story obviously. All reviews are most welcome.