When Derek opened the door to his house he saw his sister Amy sitting at the dining room table surrounded by brain scans. He smiled at her.

"I'm glad to see you're hard at work."

She moved to put the scans away before he could look at them. He figured she was still mad at him, and she wanted to be independent.

"Amy, Please don't move out. We really need you here now.'

"Why now?"

"Because I took the job in Washington, D.C. I'm leaving on the red-eye tonight."

"Tonight?"

"Meredith told me to go."

"Seriously?"

"Yes," Derek said with a frown. "She wants me to leave."

"That's what she told you."

This is my home,"he said, looking around. "My dream home, and she told me to leave."

"Derek, you can't leave mad at her."

"Why not, Amy?" Derek asked, puzzled.

"Do you remember the last time you moved 3000 miles away when you were angry with your wife?"

Derek remembered meeting Meredith at Joe's right after arriving in Seattle when he was trying to make a new start and forget his marriage. He met his sister's eyes. "This isn't that. I love Meredith, even when I'm mad at her."

"You should get a wedding ring." Amy advised him.

"What?"

"You need to make sure all the women know you're married. I'm sure that there are many women in DC who would find you attractive."

"Amy, you're my sister. This is a weird conversation."

"Derek, I loved Addison. I was - even still am- closer to her than my own sisters. I was devastated when I learned you left."

"Addison loved being your big sister. I'll always remember her helping you get ready for prom." Derek said with a smile, sitting next to Amy, who had moved to the sofa. "I loved how much she loved you."

"And you got mad at her, moved 3000 miles away, and met Meredith in a bar and that was the end of your marriage."

"I think you forgot the part where I found Addison in bed with my best friend."

"I didn't forget that. But if you hadn't run away, you might still be married to Addison."

"I doubt it. You know she lived with Mark for months after I left. He loved her. If she slept with someone else, we might have made it. But she ruined my friendship with Mark for more than a year, and I wish I had that time back." Derek said, frowning. "I really miss Mark."

"Me, too, but I think he'd kick your ass for leaving Meredith.''

"He liked Meredith. Did I ever tell you what happened when he came to Seattle for the first time?"

"No."

"I saw him talking to Meredith, and I punched him so hard that he needed stitches."

"Was that because he was talking to Meredith or because he slept with Addison?"

"Maybe both." He smiled. "He told me he moved to Seattle to get me back. He was a great friend, that is, apart from sleeping with my wife."

"Didn't it work out for you, meeting Meredith? If he hadn't slept with Addison, you might still be in New York."

"What are you trying to do, Amy, get me to stay here?"

"You can go and work in DC. I just don't want you to be angry when you leave. And I don't want you wandering into a bar without a wedding ring and falling in love with another woman. I love Addison, and I like Meredith. I also love Zola and Bailey. I don't want any more sisters-in-law. I'm done."

Derek smiled, "I'm not interested in any other women. I do have two children to think about, Amy. Do you think I need to worry about Meredith?"

"No, she has Zola and Bailey here, to repel men. Plus she has lots of friends to hang out with. You're the one who will be lonely."

"I'll bury myself in my work, and don't worry, I'll come back frequently to see Zola and Bailey. But it would be great if you stayed here to help Meredith."

"I will for the time being."

"Thanks."