A/N- okay so here is my next story. I hope you enjoy this one as much as the others. There is some Mer/Der, but mainly Addek.

-Prologue-

Derek and Addison had divorced six months ago. It had been a mutual decision. They both knew that trying to save the marriage was useless, especially when one of them did not want that to happen. After the divorce Addison had taken time off from work, she needed time to heal before she had to see Derek face to face everyday. Derek had somehow been able to finally forgive her after the divorce. He didn't understand why after the divorce he could finally forgive her. Was it because he didn't have to? Was it because the marriage was over, so he was not forgiving a wife, but a close friend? He did not know, and assumed he never would. The reasons why no longer mattered, the fact that he had forgiven her was all that was important. He and Addison had mended their friendship, and were now closer than they had been in a long time. They would have lunch together, talk to each other, and joke around together. This irritated Meredith to no end. She could not understand why Derek was doing this. Why was he spending more time with Addison then he was with her. He had divorced Addison and was committed to her now, but why was he still so close to Addison? Meredith did not understand. She and Derek were living together in the trailer, which she was not that fond of. It had been nice at first, but now it was getting old. Addison had moved into a nice penthouse apartment on the outskirts of town. After the divorce she had felt so alone, but now she was moving on. She was making friends, fixing up her apartment, making Seattle her home. Life was good for Addison and Derek. She had someone to talk to, and he had the Addison that had been away from him for so long. Life was perfect.

-SGH- 12:30pm-

Derek walked down the long corridors searching for Meredith. His parents had just called and informed him that his father's firm in New York was throwing a big party and that he had to attend. He was also informed that he could not come alone. He finally spotted Meredith standing at a nurse's station flipping through a chart. He walked up beside her and kissed her cheek. "Hey." He said softly.

"Hey to you too." She said as she smiled up at him. "I haven't seen you much today. Where have you been?"

"I had an early surgery, and then an emergency came up, so I have practically been operating all day. Listen I have surprise for you."

"Oh really?" she asked as she started walking toward the elevators.

"How would you like a short vacation to New York?" Meredith turned and looked at him. "My parents called and my dad's firm is throwing a big gala and I have to attend. I thought we could go together and you could meet my family." Meredith began to protest, but Derek stopped her. "I already spoke to the chief and he gave us the go ahead. It would be for three days, so it is not like you would miss much work."

Meredith just stood there not saying a word. "Derek I can't go."

"What do you mean you can't go?"

"I can not miss that much work. If I miss a good case or something I could get behind in the program. I am sorry to disappoint you, but you should have talked to me before making the plans." She turned to get on the elevator, but was stopped when Derek grabbed her wrist. "You mean you are refusing to go?" he asked with a hint of anger in his voice.

"I have a patient to attend to." Was all she said before the elevator doors closed.

Derek was furious and hurt all at the same time. Why was Meredith so worried about work? What could she possibly miss in three days? He sighed and waited on another elevator. He found himself getting off near the neo-natal unit. He didn't know why, but he felt like he was being drawn to it. He pushed open the door to the nursery and walked in. He looked at all of the tiny baby's lying in the isolates. Derek walked over to a small baby girl who was in the corner. She was about the size of Derek's hand, but had a strong grip on his pinky finger.

"It's amazing how something so small can be so strong." Derek didn't need to turn around to see who the voice belonged to; he knew that sound by heart. He slowly removed his hand and closed the little circular opening on the isolate. "What are you doing up here?" Addison asked as she checked the little girl's vitals.

Derek shrugged. "I got into an argument with Meredith."

"Well, don't you think you should talk to her about it, and not me?" Addison asked as she walked out of the nursery with him.

"We finished the argument. See my dad's firm is having a party and I have to go with a date."

Addison stopped him. "Let me guess. You went ahead and asked the chief for the time off for you and Meredith, he said okay so you run and tell her the good news, except she doesn't want to go and refuses to go?"

Derek stood flabbergasted. "How did you know?"

"I have my sources." She said with an evil grin.

Derek just rolled his eyes and smiled at her, that is when he had the idea. "Hey Addi what do you say to a trip home?"

She eyed him curiously. "Are you asking me to be your date?"

"Yes I am."

She bit her bottom lip in contemplation. "What about your parents?"

Derek touched her shoulder. "Addi they love you. Every time I talk to them they always ask how you are doing and send their hellos." He squeezed her hand. "Please come with me."

She sighed and rolled her eyes. "How can I refuse you when you beg?" She laughed lightly. "I would love to come." He smiled a genuine smile. "On one condition." He raised his eyebrows waiting to hear her stipulation. "I get to buy a new dress."

Derek rolled his eyes. "Fine you can buy a new dress when we get to New York, but do I have to go?" She nodded her head and began to walk off. "You are evil Addison Montgomery."

She threw her head back and laughed. "I know." She shot back at him.

"I'll give you more details later." He hollered after her. She simply nodded and walked away.

-Later That Evening- Meredith and Derek's Apartment-

"So I heard you invited Addison to go with you to New York." Meredith said as they pulled the covers back on the bed.

"Yes I did."

"Were you going to tell me?"

"Yes."

"When?"

"When you were more rational." He said as he sat down on the bed.

"Derek why are you taking your ex-wife with you?" She asked as she slid into bed.

"Because my girlfriend refused to go with me." He said looking over at her.

"But Derek she is your ex-wife!"

"She is also my friend Meredith. I was married to her for eleven years, and knew her four years before that. We were and always will be friends. Why can't you understand that?"

"I do understand!"

Derek stood up frustrated. "No Meredith, no you don't. Look I am tired of arguing, I am going to go sleep on the couch. Goodnight."

Meredith just sat in the bed and closed her eyes. It was her own fault that he was taking Addison, she knew that, but she couldn't help but feel angry towards the woman who was taking her place. Was this how Addison had felt about her?

-3 Days Later-

Derek and Meredith had not talked about the trip since that night; they simply avoided all conversation about it. However he and Addison had been making plans like crazy. They were both going to stay at their parent's houses, but share a car during the trip. They would leave in a week and stay in New York for three days. The gala was on Saturday night, so they were going shopping that day for a dress for Addison. Addison was excited about getting to see her family and friends, and Derek was excited about getting to spend some time with Addison. He felt horrible about being so happy that Meredith wasn't going. He loved Meredith, but it had been a long time since he had spent time with his good friend. Sure he had been with her at work, but at work they were coworkers, and there really hadn't been much outside of that. Derek and Addison sat in the on call room talking over dinner. Meredith was at home, but Derek had to pull call that night and so did Addi. "So your sister is going to let us borrow her car right?" Addison asked as she took a bite of her salad.

"Yeah, but she said that you were the only one who could drive it. Apparently she doesn't trust me enough to let me drive it."

Addison laughed. "Yeah well, with the way you drive I don't blame her." Derek threw a piece of fruit at her and she gasped. "Hey watch it buddy."

Derek sighed as the laughter died down. "I missed this." He said using his fork to point between the two of them. "I missed my friend."

"Me too." She said softly. "Oh, by the way, on Saturday you don't have to go shopping with me if you don't want to. Sav offered to go with me; you and Weiss could hang out if you wanted."

"I thought part of the deal was that I went shopping with you."

"Yeah, well I am letting you off the hook. Besides you would just complain all day and that would irritate me, and then we would argue, and yada yada yada you know the routine."

Derek laughed and nodded his head. "Yeah you are probably right. So you don't mind if I bail on the whole shopping thing?"

"No, I don't mind. Oh so are you going to meet me at the airport?"

"Yeah Meredith is going to drop me off before she goes into work." He looked down at his hands still saddened by the fact that Meredith had refused to go with him.

"Don't take it personally." Addison said as she squeezed his hand. "She is young, and will learn through time."

Derek looked up at her and smiled. "You know Addi I really am happy you are going to this with me."

"Me too."

-The Airport-

Derek and Meredith rode in silence to the airport. She was angry at him for taking his ex-wife and he was angry at her for not going with him in the first place. As Meredith pulled into a parking space Derek sighed. "You know I wouldn't be taking Addison if you had agreed to come."

"I know Derek, but I still don't see why you chose to take your ex-wife instead of one of your friends from New York." She said as she went to the back of the car to help him get his stuff out.

"Meredith why do you always refer to Addison as my ex-wife? Why do you hate her so much? She stepped aside so we could be together, and all you can do is hate her." He slammed the trunk down and pulled his rolling suitcase behind him.

Meredith sighed. She didn't want to have this conversation right now. "Can we talk about this later?" She asked as she ran a hand through her hair.

"Sure." He said softly as they walked to get him checked in. Once they got to the right spot they both sat down exhausted. Not exhausted from the airport, exhausted from life in general. Derek looked up in time to see Addison come walking in with her luggage. She had one rolling suitcase that matched his and a large carryon. He chuckled as he saw her struggling with her suitcase. He stood to go help her and received a glare from Meredith. "You always did know how to pack light." He chuckled.

"Shut up!" she spat. "The least you can do is help a girl out."

He took her rolling suitcase and walked over with it to where he had been sitting. He sat down next to Meredith and Addison sat next to him. "Good morning Meredith." Addison said cheerily.

"Good morning Dr. Montgomery." She said stiffly.

"Oh Meredith, when we are outside the hospital it is Addison."

Meredith simply nodded her head in return. She looked down and her watch and stood. "Well I should go, or I am going to be late for my shift."

Derek stood and kissed her lightly on the lips. "Drive safe."

"I will, and have a safe flight." She turned and walked away.

Addison had stared at their chilling embrace. "Wow! Anyone have a heater, because after that I am freezing." Derek just gave her a small smile and sat back down. "So what's up with you too?"

Derek shook his head. He did not want to tell Addi that she was their problem. "Oh, we just had an argument about something this morning, nothing big."

"Okay." Addison knew it was probably about her, but she kept her mouth shut. Their flight was called and they began to board.

-New York-

Derek's sister Abby picked them up at the airport and she and Addison had been jabbering on non stop. "Oh, D by the way you are going to be staying in a hotel room." His sister said lightly.

"What? What happened to me staying in my own room?"

"Well, some other relatives came in from out of town, and the whole house is full, sorry bro."

He sighed and leaned back into the seat. "Just great."

"Hey Derek we have a spare room at my parents' house. You are welcome to stay there." Addison said.

"Really? Your parents wouldn't mind?"

"No, not at all."

"Well then it's settled, on to the Montgomery residence." His sister said cheerily as she turned the corner.

-The Next Day-

Derek and Addison had been getting ready for the past hour. Addison had gone with Sav to buy a dress and Derek went with Weiss to find a tux. They had both finished just on time and were now rushing to get ready. His dad had hired a limo to pick them up and it would be there in thirty minutes.

"Addison are you ready yet?" Derek hollered up the grand staircase. Her parents' house was beautiful and elegant, much like his parents' home.

"I'm coming, gosh!" She said as she came down the stairs slowly.

Derek's breath hitched once he saw her. "Addi you look amazing." She was wearing a strapless black dress with a Cinderella skirt. It had white jewels that started at the waist and rained down to the bottom. She also had an elegant white shawl to match.

"Thank you." She said softly. "You look mighty handsome yourself."

He lovingly caressed her face and admired the small curls that hung down. "You ready to go and socialize?"

"Oh please, I was born to socialize." That could have been said about the both of them. Ever since they were small they had been attending functions. Derek took her arm and escorted her to the limo.

-At the Gala-

Derek was talking to some of his dad's associates, but the whole time he kept glancing over at Addison who was going on with some of his mother's friends. She was so beautiful, and he could not keep his eyes off of her. "Excuse me gentlemen." He walked over to where she was standing and cleared his throat. "Ladies would you mind if I steal Miss. Montgomery from you for a moment?" Derek had used his charming smile and knew it had worked. They all gave him their permission and with that he took Addison's arm and led her to the dance floor. The orchestra began a new piece of music as they stopped in the middle of the floor. They took their positions and began to dance in a natural way. They had both taken ballroom dancing lessons; mainly for this very reason. "I am glad that I am here with you." Derek said softly.

"You are?"

"Yeah, because Meredith would have never danced with me, or talked to my mother's friends."

Addison smiled. "Derek she would if you would introduce her."

"Addi I don't think that even then she would talk to them."

"That's not what I meant." She looked up into his eyes. "Derek we grew up in this." She gestured around them with her free hand. "All of our lives we have socialized, picked out fancy dresses, eaten fancy food that looked gross…" he chuckled lightly at this. "But Meredith never has. She doesn't know what to do in a situation like this, because she has never been in one. If you would introduce her to this type of life, then maybe she would be a part of it." Addison looked down then back up. "But Derek this isn't you anymore. You don't go to balls or galas. You used to when we…when…when we were married. You have changed, and you are with a woman who is my total opposite. If you don't live in this lifestyle don't worry about her not fitting in. She fits in just fine in Seattle. Do you see what I mean?"

Derek simply nodded his understanding. 'How can she do that?' he thought. 'How can she make me want Meredith and her at the same time, but yet she talks as if she is wanting me with Meredith. How does she do it?' Derek felt confused inside. It was definitely time for a drink.

-Montgomery Residence-

Addison and Derek stumbled into the living room and fell onto the couch. Her parents had driven up to Maine for the weekend and had left the house in Addison's care while they were gone. Derek handed Addison the bottle of tequila after he took a long swig. They both had not been that drunk in ages. "Wellll Mr. Sheppard I think it is time bed your." Addison shook her head trying to clear it, but that only made it hurt worse. "Your bed time."

Derek stood up as well. "Yeah, I agree." They both stumbled up the stairs.

"Here is your room." She said as she opened the door. "There are clean sheets and pillowcases on the bed." She walked into the bathroom to make sure there were clean towels for him to use. As she came back out she tripped and fell on top of Derek who had been sitting on the bed. They both just stared at each other and without a word Derek pulled her to him and kissed her passionately. Things heated up quickly as they both did something they would soon regret.

A/N- Okay here is the first installment. What do you guys think? Please review!