I sat in Richard's office, nervously picking at something invisible on my left thumb. He had just briefed me on the TTTS case that had been admitted. The mother-to-be was having a hard time dealing with the complications of her unborn twins. As for me, I was having a hard time dealing with the fact that my two best friends had both decided they wanted to spend the rest of their lives married to me. I sighed, waiting for Richard to come back.

"Addie?" he had re-entered the room to find me now sucking on my sore thumb.

"Yes, sir?"

"Are you pregnant?"

"Yes, sir. Is that why you left so suddenly?"

"Er...umm."

"Richard, I'm a big girl now."

"I know, but it still seems like you should be begging me for a ride around the block in my old Corvette."

"The baby is Derek's, if that's what you're thinking about."

"Oh, good. Well, the mother of the twins is anxious for you to see her, so follow me."

Richard led me to the maternity floor of the hospital, and I spoke with the mother. The babies had an excellent chance of survival, and the mother's stats were perfect given her condition and the complications of her pregnancy. I turned to Richard and requested an intern for the case. I asked for Meredith Grey. A few days later, during my lunch break, I received a phone call from Katie.

"Dr. Shepherd?"

"Addison, Katie, call me Addison."

"Oh, right. Addison, you should call Dr. Sloan."

"Why? Is he okay? What's going on?" I was instantly concerned.

"Well, he sure misses you. He keeps saying he's going to book a flight to Seattle and that he's going to come out there and get you back."

"Oh, no. Please, Katie, don't let him come out here. Derek is actually speaking to me."

"I'm trying, but what did you do to him before you left? I've never seen him look worse."

"I've only been gone ten days."

"And I don't think he's eaten anything or slept since he took you to the airport. Seriously. What happened?"

"He asked me to marry him."

"What did you say?"

"I booked a flight to Seattle."

"Oh. That may be what's wrong with him. What does the other Dr. Shepherd have to say?"

"He wants to try and make things work."

"Uh-oh. What are you going to do?"

"I have no idea."

"I think you should pick Mark. He's sexy."

"Katie!"

"Well, he is. Call him, okay. He's freaking out."

"I will."

As soon as I hung up with Katie, I dialed Mark's number. He picked up on the first ring, yelling my name repeatedly before I'd even said hello. My voice suddenly disappeared, and I hung up. He called me straight back.

"What happened? Are you okay? How's the baby?"

"Mark, calm down. We're fine. I accidentally pushed the end call button."

"Oh. How is Derek?"

"He's great," I replied hesitantly.

"What are you not telling me?"

"Well, he wants me to move here and give us another try," I couldn't bring myself to lie to him about something so important.

"Are you going to?" his voice was high and squeaky.

"I don't know yet."

"Addison, I love you so much. Please come back to New York."

"Mark! Do not pressure me. This is going to be a hard enough decision as it is."

"I'm sorry. I know this is going to be hard. Just...be careful in Seattle and try to call me pretty often."

"I will."

"I love you and the baby. Will you pat him for me?" Mark had taken to patting my stomach once the bulge was showing under my shirt.

"There," I put my hand over the baby bump. "I just patted his backside."

"How do you know it's his backside. He's too little."

"I just know."

"Well, okay," he paused for a long while. "Addie?"

"Yeah?"

"I miss you."

"I miss you, too."

As I hung up, I realized I missed Mark more than I had missed Derek in the few months that he'd been gone. While the first nine years of our marriage had been wonderful, the last year and a half had been pretty tough. We both made huge mistakes. At times we were so busy we forgot to fight. The rest of the time, we fought. Then, we ignored each other. We'd been together since our first year of medical school. It was time for something different. I sincerely hoped he would be happy with Meredith. She seemed nice enough, smart. She obviously worshipped him. I flipped the phone open again.

"Addie?"

"I miss you."

"I miss you, too. We just went through this."

"Mark! I really miss you. I want to be with you. Forever."

"Oh. Are you...are you saying that..."

"Yes, I want to marry you."

I clicked the phone shut once more, grinning widely from ear-to-ear. Then, I realized I had to tell Derek my decision. I wanted more than just about anything to put it off for a while, but I couldn't do that to him again. I stood up to throw away the remains of my lunch, no longer hungry (only to have it confiscated and devoured by an intern named Alex Karev) and went in search of my husband.

A/N: Sequel, anyone? I'm only going to write it if I get enough reviews asking for it, so if anyone is interested in finding out what kind of daddy Mark would make, please review!