Author's note: Thanks for all the great reviews! Unfortunately this is the last chapter but don't worry I'm already working on a sequel. So enjoy!

"Derek you haven't answered any of my phone c

alls!" Addison said as she approached him. He opened the door to his bmw and unbuckled Mallory from her car seat.

"Oh," she said as he held her to his side and closed the door.

"Not now Addison." He replied walking to the front door.

"Then when Derek, when?" she hissed catching up to him and facing him as he stopped walking.

"Maybe when I'm not carrying my nine-month-old daughter in my arms and we're not in public." He answered blowing completely past her. Addison sighed leaning against a pole and breathing hard.

"She seems…happier." Izzie whispered to George as they made their rounds. "Do you think that thing that happened with McDreamy was good?"

"Good, definitely good." He responded as Meredith gave a warm smile to a pregnant patient.

"Who's presenting?" Bailey asked as Meredith opened up the patient's chart. "Emily Ford, post op day two recovering from a surgery correcting TTTS Twin Twin Transfusion Syndrome."

"Good, now who is the surgeon on this case?" Bailey asked taking the chart from Meredith.

"Sorry Dr. Bailey, I was having some…car problems." She said as she entered the room glancing at Meredith.

"Grey you're on this case." Bailey assigned handing the chart back to her.

"So were there some complications with the surgery?" Emily asked trying to sit up in the bed.

"Easy there, it still appears that one of the twins is still not receiving as much blood as he should be, some I'm just gonna go in there a second time and correct it again." She smiled touching her shoulder gently.

"If you have any questions you can ask Dr. Grey." She said leaving the room. Izzie took note that her eyes were red and puffy, probably from crying.

"Awkward." Izzie murmured as the walked into the next room.

"You paged me." Meredith said approaching Addison.

"Yes I wanted to know if you scheduled the surgery?"

"I did, but I can't scrub in. My shift is over and I can't really afford to miss the time with Mallory." She explained softly.

"I remember that was one of the reasons Derek and I decided to not have kids, at first." She began, ignoring Meredith's body language when she tensed at the mention of his name.

"Derek didn't want children to interfere with his career, he was a hot shot doctor. He thought that kids would surely be a detour. So we put it off. Then, after I started to see all of my girlfriends gushing over what Tommy did that morning or what Samantha said I realized that I wanted that. I wanted to have a little boy with Derek's blue eyes and his amazing hair. So we started to try and after a few months I started to get worried. Derek suggested that we get tested just to soothe my fears. Then I discovered that I was the real problem and that Derek was completely fine. It hurt like hell, because I couldn't give Derek the one thing he really wanted. Sure it took some convincing but he opened up to the idea. I would catch him in Peds cooing at the babies and sometimes holding the ones without mothers. So when he learned that he wouldn't be able to have his own he grew distant. We both did. He spent more time at the hospital and I started spending more time with Mark. And I take it you know the rest from there." She finished putting her hands in her lab coat.

"Why," Meredith asked. "why are you telling me all of this?" Addison gave her a small smile.

"Derek isn't the kind of guy who just leaves his wife of eleven years without a really good reason. So all that time he was spending with me, he was trying to figure out how deep his feelings for you were. You've given him everything I possibly couldn't give him." She put a hand on Meredith's shoulder.

"Goodbye Meredith, take care of him." Addison walked off. She bumped into Cristina and asking her if she wanted to scrub in. She nodded eagerly but in a very un-Cristina like fashion looked to Meredith for the okay. She laughed brushing a tear away and nodded.

Meredith ran up the stairs and pushed her front door open. The sound of the television and her friend's chatter filled the room as she looked around for Derek.

"Hey Mer." Izzie said walking out of the living room.

"Hey, where's-"

"Derek's in the kitchen." She said nodding her head towards the door. Meredith smiled gratefully and pushed past the revolving door. George jumped up from the couch fighting for listening space with Izzie.

"Hi there." She said as she watched him prepare dinner. "Where's Mallory?" Derek smiled as she walked over to him looking inside the pot. He kissed her mouth quickly and stirred the pasta sauce.

"She's sleeping Izzie said she'd watch her for us tonight."

"Why?"

"We are celebrating." He explained.

"Celebrating? What are we celebrating?" He fished a black velvet box out of his pocket and put it down on the counter.

"Our engagement." He smiled slyly. Meredith, with trembling fingers, picked up the box and opened it to reveal a gorgeous 2.1-karat diamond ring. She snapped it shut quickly and slammed it down on the counter.

"What?" he asked turning to her.

"No. What is this?" she asked gesturing between the two of them. "Before you can call me your wife you need to tell me why you really didn't want to leave your other wife." She stood there with her arms crossed in front of her. There was no way she was going to let him get off this easily.

Derek sighed rubbing his temple. "I just couldn't leave. I was somewhat comfortable with our little arrangement. I knew that she couldn't possibly leave me or cheat on me again. But with you, we had always been unpredictable and like I told you before I was afraid that I would push you away. That I would make you run into the arms of another man." Meredith digested this all picking up the box and pushing it against his chest. He looked at her with alarm.

"If you're gonna propose to me do it right." She said. Derek let out an uneasy laugh and dropped onto one knee.

"Meredith Grey, love of my life and mother of my children will you marry me?" he asked already slipping the ring onto her finger. Meredith smiled joining him on the floor.

"Yes." She said as she wrapped her arms around his neck bringing her mouth to his and kissing him soundly. "But, if you ever cheat on me I'll kick your ass." Meredith said kissing him again.

"That won't be a problem."

"Wait you said 'mother of your children'? Is there something that I should know about but I don't?" Derek laughed again lifting them both up from the floor.

"No. But I was hoping we could work on that."

Fin.