Author's note: Hi guys! Here it is another story about Catherine, Steve and his famous "She's not my girlfriend". In this fanfiction Catherine still works for the Navy, she's been stationed at Pearl for years and she doesn't know the team in person, yet.

Thank you for reading. I hope you like it.

Disclaimer: I don't own Hawaii Five-0 or any of its characters.

He's not my boyfriend - Chapter 1

"Hey Cath, I need a favour." Steve begged her through the speaker phone, while driving his partner's car.

"Of course you do. What's now?" She joked, amused.

"I need you to run some intel about our suspect. He's an ex marine." Mcgarrett told her.

"Ok, text me what you've got already. I'll see what I can do."

"Thank you, Cath. I owe you."

"Oh you sure do, sailor. See you later."

"Bye" And he hung the phone.

A mischievous look appeared on Danny's face. "So...when are we going to meet your girlfriend?"

"She's not my girlfriend" Steve stated matter-of-factly.

"Ok. You call her by a nickname and you smile like an idiot when you talk to her, but she's not your girlfriend. Whatever man, you seals are weird."

"She is not my girlfriend."

"Ok, ok... So, when?" Danny repeated.

"When what?" Steve asked, as if he hadn't been paying too much attention.

"When are we going to meet her?"

"I don't know. What's the rush anyway?"

"Rush? I've been working with you for a year now, I don't know your girl'..your friend who happens to be a girl. I've never been in your house either...but you know everything about me." Danny told him, a bit hurt.

"It's not my fault if you are a sharer. But I like my privacy." Steve declared.

"Mmm... if privacy is how you call to being a hermit." Danny was getting annoying and Steve wanted the conversation to end.

"I'm not a hermit. And stop it! We have work to do." Steve grunted, getting out of the car, now parked outside Five-0 headquarters.

As usual, Danny didn't waste any chance he got to bicker with him for the next couple of hours. And when Catherine phoned back with their suspect's intel, he took advantage of it.

"Hey, Catherine. What do you have?" Steve said her full name on purpose, because the blond was listening.

"I've just sent you a bunch of files. Most of the information is classified, but I think you might find something useful."

"Ok, thank you. I'll see you.."

"Yeah, thank you, Catherine. It's Danny." The detective interrupted, getting closer to the phone.

"Oh, hi Danny! Nice to talk to you!" She exclaimed surprised.

"Yeah, same here! This neanderthal boyfriend of yours never introduced us properly." Danny spoke louder than it was necessary.

"She's not deaf" Steve whispered with his eyebrows risen.

"He's not my boyfriend" Catherine answered awkwardly.

"I told you" Steve pointed out with a triumph smile.

"Mmm. Well, thank you again. I hope you join us next time we go to Kamekona's with the team." Danny insinuated.

"Oh, thanks Danno. I'll try. Bye guys. Be careful...And Steve, I'll see you at 18.00?"

"Sure. Bye"

After checking the files, Chin found a lead and they partner up again to follow it.

Back in the car, Danny continued with the questioning. "What's happening at 18.00? And why can't you Navy people tell time like everyone else?"

Steve stared at him. "It's not your business what I'm doing this evening."

"It sounds like you have a date with your not girlfriend."

"You are worse than a child..."

The case took longer than they all had expected and Steve arrived home quite late.

"Cath?" Steve called, closing the front door.

"In the kitchen!" He heard.

Steve found her doing the dishes with her hair in a ponytale. He leaned on the door frame and enjoyed the view for a few seconds."God! She's gorgeous!" Then he approached her. "Hey, I'm sorry I missed it..." He gave her a kiss on her cheek. "I thought we will close the case in time".

"I know how the job is, Steve...but don't apologize to me..." She kissed him back and he noticed she wasn't mad.

"I know. You're right...How is he?"