So I had this idea last night before I went to bed and it was the first thing I did this morning/noon when I woke up.

I'm actually planning three other ones but I felt like uploading this first.

I don't know in which direction this will go and therefore decided to take the M-rating.

I just wanted a roommate AU really really badly.

Disclaimer: I don't own the characters.

ENJOY!

"Hey O- Whoa, what's going on?"

As she walked into the apartment, the two people standing in the living room and screaming at each other abruptly stopped.

Her gaze wandered to the tall brunette. Her best friend looked exhausted. Her otherwise carefree spirit was nowhere to be found.

Clarke could feel the eyes of the dark haired, freckled man on her but she purposely avoided meeting them. It was better for them all if she acted as if he wasn't there.

"Clarke, I'm so glad you're here." her best friend said, throwing her arms around her.

"You call, I jump. But tell me, what's going on here?"

"That really is non of your business, Princess." his deep voice growled.

Okay, she had really tried to ignore him but goddamn this man was driving her crazy. Clarke loved her best friend more than anything else on this planet but she really loathed her brother.

Bellamy Blake was the bane of her existence since elementary school.

They hadn't seen each other in a couple of years because he'd moved after his partner had died. But now he was back. Clarke had avoided her best friend's apartment for the last three weeks because of him. It seemed that after all those years he still couldn't resist to pick a fight with her.

Clarke plastered a fake smile on her face and finally looked at him.

"Well, hello to you, too, asshole."

Her voice was laced with sarcasm and Bellamy had to suppress a grin. Only his sister's best friend, the infamous Clarke Griffin, could manage to sweetly smile at him and at the same time glare at him.

He hadn't seen her in years and she was still a pain in the ass.

But Bellamy had to admit that she was even more beautiful now than she was when they were teenagers. She'd matured very well. Bellamy quickly let his eyes wander up and down her body once, lingering a little on her chest and her hips. He unconsciously wet his lips and he quickly averted his eyes from her body. Instead he met her own, piercing blue eyes.

She had noticed him not so subtle checking her out and her eyebrows darted up.

But before she could say something he said,

"Come back later, Princess. Octavia and I have some things to figure out?"

"Since when do I give a shit about what you want, Bell?"

Suddenly everything was quiet. His sister's eyes were constantly flicking between the two. And even Clarke's expression was utterly shocked.

What had she done? Bellamy's eyes were almost popping out of his head.

The nickname had smoothly left her lips. She never called him Bell, never. It was too personal, too emotional – something she'd avoided for years.

She averted her eyes from him. Not able to bear his intense gaze any longer.

Instead she looked at Octavia who looked just as surprised. Before things could get more awkward, she asked,

"Well?"

"My brother is the pain in my ass. I spent the night at Lincoln's and when I came back he was totally panicking and freaking out. I told him that I can't really bring my boyfriend here when my brother is here."

"Makes sense but doesn't explain why I am here?"

"I thought that maybe... because Anya is gone and you need... you know-"

Clarke cut her stammering off with a wave of her hand.

When she realized what Octavia was implying she fiercely shook her head.

"Clarke, please." the other woman pleaded.

Bellamy's confusion grew with every second. He'd no idea what the two girls were talking about but the petite blonde in front of him looked horrified.

"No, O. No. There is no way in hell that this will ever happen." she said with a high-pitched voice that was very unlike her.

His sister tried her huge puppy eyes.

"Please Clarke, I'm going crazy and it would be perfect-"

"Perfect?" the blonde squeaked. "Perfect? Are you fucking kidding me? "

"Clarke..." his sister tried again.

Bellamy had enough and he raised his voice.

"Can someone please tell me what the fuck is going on?"

Clarke's eyes flickered in his direction before she looked away again.

"Bell, I love you but you really can't stay here any longer. And since you don't seem able to find an apartment by yourself, I thought I'd help you out. Anya, Clarke's roommate, moved out last weekend and Clarke cannot afford the apartment by herself..."

Clarke watched Bellamy's eyes widen as realization dawned him. He looked at her and she couldn't help it, she burst out into laughter. Bellamy glared at her.

She grinned and looked at her best friend again.

"Seriously Octavia, we'd kill each other before the week's over."

O shook her head.

"No, I think you'd make pretty good roommates? What do you think, Bell?"

Bellamy had been disturbingly quiet. When she met his gaze he finally spoke.

"Do you really think that Princess?"

"Yeah, don't you." Confusion was clear on her face.

"I don't know." he honestly answered.

He seriously had no idea what made him say his next words.

"But sounds like a challenge to me. Let's find out."

His sister looked hopeful at her friend.

Clarke – surprisingly – seemed to think about it.

It was quiet for a moment and Bellamy began to worry. It probably was a really bad idea.

When Clarke spoke, she surprised them all, even herself.

She thought it was a horrible idea. But Octavia was right. She could not afford the apartment by herself and she had no time to find another roommate. They could try it. Clarke spent most of her time at the hospital so they probably wouldn't see each other very often.

Her eyes met Bellamy's dark one's.

"Four weeks. If it doesn't work out, you have to find something else, okay?"

A soft smile played at his lips and he offered her his hand.

"Four weeks." he agreed and she took his hand.

Octavia squealed in excitement and threw her arms around them.

Clarke looked at him with a faked painful expression.

"Do you mind if we kill your sister first?"

Bellamy couldn't help but laugh.

"Hey!" Octavia yelled.

Clarke grinned at him and he thought that maybe, maybe they could work it out.

Thanks for reading!

Love,

Kat xx