Addison hears the door slam shut downstairs and wakes with a start and jumps out of bed. She runs down the hall to the room Derek is sleeping in and walks in. She sees Derek has jumped up too.

"Derek I think someone is in the house."

"Don't panic Addie, just wait here and call 991."

"Derek, let's just stay in this room. I don't want you to get hurt. What if they have a gun? After what happened with your father. I can't lose you like that Derek."

"Addison, please try and stay calm."

They start to hear footsteps coming up the stairs and then they start to hear singing and the voice sounds familiar.

"Hang on Derek, I think it's Amelia. I don't know why she'd come here in the middle of the night, but I know that she had a key and maybe she was in New York and needed somewhere to stay."

Addison opens the door and heads out into the hallway and she sees Amelia heading towards them.

"Addie... Derek. I thought you guys were in Seattle. I'm sorry if I scared you right now. I used my key, I didn't think you'd be here. I was visiting some friends in the city and we got separated so I thought I'd just crash here."

"Oh it's so good to see you Amelia." Addison tells Amelia and pulls her into a hug. "You did give us a shock but then I heard you singing and I would recognise that voice anywhere."

"Yeah you're lucky. We were about to call the cops." Derek tells his sister. "Not that it's not good to see you Amy, but it is very late."

"Oh well I'm glad that didn't happen. So what are you doing here anyway? Last I heard you were in Seattle."

"Well we came back for a few days cause we wanted to sort the brownstone out cause we're going to sell it. I don't know if you heard but Derek and I got divorced and it was time to sort everything out so we can move on with our lives."

"Seriously.. Derek I know Addison can do a million times better than you but how could you let her slip away like that? I always thought that you two would make it. I love you so much Addie and you'll always be part of my family even if my stupid brother has made the biggest mistake of his life in letting you go."

"Wow thanks Amy.. nice to know I mean so much to you." Derek tells his sister sarcastically.

"You know I love you, Derek. No matter what but I love Addie more than anything and she deserves so much better than what you were giving her."

"Thanks Amelia, but please don't be too hard on Derek. We both made so many mistakes which led to our divorce and it's over now and we just have to make the best of it and move on with our lives."

"Ok I'll try not too be too hard on him, even though I think he's made the biggest mistake of his life. So anyway, I guess I'll find another one of your spare rooms if that's ok?"

"Yeah there's plenty of room available. Me and Derek are staying in 2 of the other bedrooms. So just find another one and make yourself at home."

"Ok I'll do that. I guess I'll see you both in the morning. Goodnight Addie. Goodnight Derek."

"Goodnight Amelia."

Addison and Derek watch Amelia walk off down the hall and then Derek turns to Addison.

"So it was just my little sister."

"Yeah.. even though she just almost gave us both a heart attack. It was still good to see her and I'm glad it was just Amelia. I don't want to think about what could have happened if it had actually been someone breaking in."

"It's ok, Addie. It was just Amy. We can calm down and try and go back to sleep now."

"I think I might need a drink to calm me down. I know it's late but I think we still have some decent scotch and other liquors downstairs if you want to join me for a drink."

"Yeah that sounds good I'll just put something on and then I'll come and join you." Derek tells her and Addison blushes as she notices that he just has his boxers on. She forces herself not to stare and turns her gaze away from him.

"Ok so I'll go and pour us both a drink and I'll see you in a minute." Addison tells him.

Addison goes downstairs and finds some glasses and grabs the bottle of scotch from the liquor cabinet and pours them both a good measure. A couple of minutes later and Derek joins her and she sees that he's put pyjamas on.

Addison hands him a glass and she watches as he takes a sip before taking a sip of her own glass.

"Hopefully this will help us sleep. This was always one of my favourite scotches."

"I know I got you it for you birthday last year."

"Yeah I remember. That was a good night."

"Probably one of the last ones we ever had together as a couple." Addison says sadly.

"I'm so sorry, Addie. If I could turn the clock back I'd never have been such an idiot."

"Derek, we can't turn back time. Just promise me you'll do better in future. I know the kind of man you can be, Derek and you really can be loving and all kinds of amazing. But you can also loose sight of it all and just become so focused on yourself and your work and become so selfish. So try not to be in the future. Even if it kills me to see you with Meredith, if she's really the one for you and you're happy then please don't mess it up."

"Addie, I promise I'll try to be better. To be the best I can be, rather than the worst. I can't promise that I'll always be perfect. No one is perfect, Addison. Look I don't know for sure if things will last with Meredith, I haven't really known her all that long. All I know is that when I was with you, I couldn't stop thinking about what I could have had with her. It was so easy and carefree before you turned up. But it was also built on a lie, she never really knew anything about me. Even after everything that happened she still doesn't really let me in, but she's young and maybe she needs more time. Sorry you probably don't want to hear about my relationship with Meredith."

"No it's ok. Maybe best you don't go on any further though. I think I've heard enough so you don't need to tell me anything more. I just want you to be happy, Derek. I don't need to hear all the details."

"Ok no more details. Let's just finish our drinks and try and get back to sleep."

Addison and Derek finish their drinks in silence and then head up the stairs and back to the rooms they were sleeping in earlier that night.

Ok so that was an idea I had on bringing Amelia into the story. Hope you like it and please review and let me know what you think.