Set a few months after season 4. What happens when two people arrive at Seattle? What is wrong with one of Derek's sisters? MerDer and a few other pairings later on. Co-written with McRebound.

Author's note: this is mine and McRebound's first fanfic. We're good friends and we thought it might be easier writing our first fanfic together. We're from Australia so our english might seem weird, like our spelling. So review and tell us what you think.

Disclaimer: We don't own grey's anatomy.

Together, Hand in Hand

Chapter 1: The way things are

Everything is going so right. Meredith hasn't felt this happy since…since… well since she'd last been with Derek. Now they were back together again, everything was falling into place. Plans for the new house had been made and Meredith and Derek haven't had one row yet. It seems that fate was leading them this way, that this was how it was meant to be, happy.

Meredith rolled over in the small double bed in the trailer to face Derek, who was propped onto his elbow, watching Meredith sleep.

"Morning," Derek said. It was usually Meredith who watched Derek sleep.

"Morning," Meredith replied.

"Are you hungry? I can make some breakfast." Derek climbed out of bed and pulled on a pair of pants.

"Thanks." said Meredith.

Derek found a pan in one of the cupboards and pulled a pancake batter from the fridge. Meredith sat up with the quilt wrapped around her body, watching her once more boyfriend cook her breakfast.

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Meredith and Derek walked in through the doors of Seattle Grace. The rain outside ceased for nobody, as it poured down relentlessly. Cristina came up behind Meredith with a dripping umbrella.

Meredith spoke first, "How are you feeling?"

Cristina sighed and hitched her bag higher up her shoulder and said, "Hung over."

Meredith sympathized for her, even though it was entirely her fault for getting drunk in the first place. "Is it really that bad?" Meredith asked.

"Worse," said Cristina, "it feels as though I'm lying awake during craniotomy surgery with no anesthetic."

Meredith made a funny noise, as if to say, 'that would hurt' while Derek just laughed. Cristina went on, "I hope Bailey doesn't think I'm drunk still. Maybe I am still a little drunk."

With that, she stalked off in another direction. Derek said goodbye to Meredith as they both went their separate ways. Meredith entered the locker room and opened her locker. Izzie came in behind her and put her bag in her locker. Both she and Meredith took off their jackets and replaced them with clean scrubs.

"Hey" said Izzie, closing her locker.

"Hey," replied Meredith, "how are you and Alex getting along?"

Izzie deliberated over this question. "Well, we're taking things slow this time. We don't want to rush into anything just yet, you know, after what just happened to Rebecca. At the moment I'm just trying to be there for him."

Meredith nodded in reply.

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Meredith sat down at the lunch table with Cristina and Izzie.

"I should go to the morgue more often." Cristina stated. Meredith just looked at her.

"I haven't had one surgery today." Izzie said, "I've been stuck with the minor injuries."

"Yeah, well." Cristina added.

Derek came walking across the courtyard. He approached Meredith. "Hey," he said, "can I talk to you for a moment?"

Meredith replied, "Yeah, sure."

Derek took Meredith over to an empty table and sat down. "So, what do you say? Me and you, tonight, out for dinner somewhere?"

"Yeah, sounds good." said Meredith, "but where are we going to go?"

Derek smiled sneakily. "Oh, don't you worry, I have it all planned out!"

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Meredith was looking forward to her date with Derek all day. She wondered what would happen, what they would talk about, how many kids they're going to have. Sometimes she was caught smiling to nobody while she was meant to be seeing to a patient or catching upon some paperwork. Finally, the time came.

Meredith closed her locker door and Derek came out of nowhere and stood at the door. "Ready?"

Meredith turned around and Derek was leaning against the door frame, with his cute smile.

She started smiling again, "yeah."

They took the lift to the bottom floor and began walking to the exit. The rain was still pouring outside and it was dim.

Just as they were about to walk out, Richard called out to Derek, "Shepherd!"

Derek turned around to face Richard, "yes, Chief?"

"If you wouldn't mind, I need you in bright and early in the morning ok?"

"Sure." he said.

Derek turned back around to face Meredith and they were almost able to continue walking when the doors slid open. In walked a pretty girl of about nineteen years of age with blonde, shiny hair. Derek stared dumbstruck at her.

About ten seconds later, another massive surprise. Addison Montgomery walked through the door. She stopped and surveyed the scene. She smiled at the awkward situation.

"Sarah?" Derek asked.

"Derek?" questioned Meredith.

"Addison." said Sarah.

"Meredith." said Addison.

"What is going on?" Meredith asked very confusedly.

A/N: Who is Sarah and why is Addison back? Is she back for good? Please review.