Author's Note: Sorry it took me so long to get this chapter up! I've been pretty busy and I had it started, but not finished. And then the other day, the ideas started flowing again so hopefully it won't take me so long to update next time. I think I'm having trouble keeping them in character, which is usually something I do well in fanfics, but I'll work on it! Read and review please!

Disclaimer: Unfortunately, I still don't own any part of Grey's Anatomy.

Addison woke up the next morning in unfamiliar surroundings. After a minute she realized where she was and remembered how she had acted the night before.

'Oh crap! I can't believe I let the interns see me that way yesterday.' She vowed not to let her guard down around them again; she didn't want to be seen as hurt and vulnerable, however true it might have been.

She groaned and got ready for her day at work. She wasn't due at the hospital until after the interns so she managed to avoid them at the house.

At the hospital she met Izzie at the nurses' station.

"Morning Dr. Shepherd," she greeted cheerfully.

"Hi Dr. Stevens." She hoped that Izzie wouldn't mention anything about the previous day. "Are you my intern today?"

"Yup." Izzie smiled. She was often assigned to Addison's cases because of her interest in neo-natal. Addison liked this arrangement; she thought Izzie showed promise in that area. Plus today it meant she might not have to face the other interns for a while. "I need your consult on a patient in room 3147. It's a high-risk pregnancy."

"Alright, let's go," Addison replied.

Once they reached the third floor they went into the patient's room.

"Erica Dane? Hi, I'm Dr. Shepherd and you've already met Dr. Stevens. She filled me in on your case and I don't want you to worry right now. I'm just going to do a quick exam and then we'll go from there."

"Okay." Mrs. Dane smiled. Her three-year-old daughter had been sitting on her lap. "Emma honey, can you go sit in that chair right there for a few minutes while the doctor looks at mommy?"

"Okay mommy." The little girl hopped off the bed, her blonde pigtails bouncing as she did so.

Izzie tried to keep Emma busy with her coloring book while Addison was doing the exam. When she finished, the little girl stood up and walked back over to her mom.

"Mommy, what did the doctor do? Did she look at my baby brother?"

Before Mrs. Dane could answer, Addison spoke. She knelt down to Emma's level. "I didn't look at your brother today, I was just giving mommy a checkup to make sure everything's good."

"Okay." Emma seemed happy with that answer. "Is my brother coming soon?"

"Not yet, but it won't be too long."

"Mommy I wanna be a doctor too!"

"I think we can make that happen." Addison smiled and then turned to Erica. "We have kid-sized scrubs and a fake stethoscope. I have to go check on another patient, but Izzie'll bring them up in a few minutes. And when she comes back she'll talk to you about the exam results."

"Thank you," Erica replied.

"Emma, Izzie's gonna come back and help make you a doctor. I'll see you later!"

"Yay! A doctor!" Emma squealed.

Addison and Izzie left the room.

"You're such a natural with kids Dr. Shepherd," Izzie commented and then paused. "Have you ever thought about having any of your own?" She pried, remembering the previous night.

"Um…I've thought about it, yes. Excuse me, I have to go check on a patient."

She walked off towards the elevator. When the doors opened she stepped in and sighed, not wanting to have been reminded of the situation she was in.

She heard someone clear their throat behind her.

"Derek! I didn't see you there," she said, surprised.

He didn't reply.

"Look Derek, I know I made a mistake, but I hate you being mad at me."

"I think I have a right to be mad Addison."

"You do, but-"

He cut her off, "No, we're not talking about this now."

The doors opened and he got off.

She leaned back, throwing her head against the wall. "How can we fix anything if he won't friggin' listen to me!" she angrily asked out loud.

She exited on the main floor and walked fast-paced until she saw a familiar face. She quickly glanced again and then once more to make sure she had seen correctly. It was Mark.

'What is he doing back here?'

In an attempt to avoid him she changed directions, but that caught his attention.

"Addison!" he called, following after her.

She eventually relented and turned around to face him. "What, Mark? What are you doing here?" she asked, annoyed.

"Hey, relax. They called me in for a case. I was thinking maybe we could go out to dinner tonight."

"I don't think so." She spun back around and started to walk away.

"Why not?"

"It's too complicated. You and I are complicated. We have history and every time you come here, it just ends up causing some kind of problem."

"You know I'll always be here for you, even if we're just friends. Derek can't be mad at us just being friends. He can even come to dinner with us, but I doubt he'd want to," Mark reasoned.

"No, I can't. I just can't do this right now."

"I don't get you Addison! You follow Derek here after he practically ignored you in New York, you find out he has a girlfriend and still you stay with him, he still loves her and yet you're still with him. But back in New York, who did you run to when Derek was indifferent? Who was your shoulder to cry on after he came here? Who did you call when you found out about Meredith? Who was the one who was there for you two months ago after you and Derek had a big fight? Why do you always chase him and I'm always the one who has to pick up the pieces after he upsets you and still, you want to be with him and not me? When are you just going to give up?"

She stopped, and turned around, just looking at him and not knowing what to say. After a minute the anger hit her. "I'm not chasing him, Mark. He's my husband. He chose me. You mean nothing to me. I wish you would just leave me alone!"

"That's not what you said two months ago when we slept together!" he shouted.

"That was a mistake! A big mistake. And look where that got me- knocked up with your child and fighting with Derek again!"

"Wait…what did you say?" he asked, his mouth agape.

Addison's eyes widened as she realized what she had just said. She looked around to see if anyone had heard. 'Of course they heard,' she thought to herself. 'This is an open hallway and we were yelling.'

She walked back towards him to continue their conversation quietly.

"Okay, I haven't told anyone yet. Derek is the only one who knows I'm pregnant, and he knows it's not his. He's always wanted to be a father and it's killing him that I'm having another man's baby. It's killing me too, but I couldn't bring myself to end this pregnancy." She took a breath. "We've both wanted a child for so long and now that it's happening we're thrilled. Well…we were thrilled until we found out it wasn't his baby. I'm still happy to be having a child and I hope Derek and I can raise it as his…if he ever forgives me."

"Wow." He tried to take in everything he had just heard.

"Yea. Please don't say anything. I don't want anyone else to know yet."

He laughed. "I think they'll find out after you basically shouted it to the whole hospital."

"But there wasn't anyone around to hear it."

"Hold on," Mark suddenly seemed angry, "were you ever planning on telling me that I'm going to be a father?"

"I was, but just not yet." She sighed and shook her head. "I just didn't know what to say. And you know you shouldn't tell anyone before the third month."

"I'm not anyone Addie! I'm the father!"

"I wanted to talk to Derek about this before I told you, but he's not talking to me right now. So I was waiting-"

"Look, you're obviously still in love with Derek and who knows how he feels. You may not be tired of chasing him, but I'm tired of chasing you. I'm done." With that, he turned around and walked in the opposite direction.

Addison suddenly felt very alone. She hadn't really thought about relying on Mark, but somewhere in the back of her mind she knew he'd always be there, and now he wasn't.

'Oh well, hopefully this means he and Derek won't fight this time.' She thought, trying to make herself feel better.

She started to feel dizzy, but shrugged it off when her pager beeped.

'There's no time for me to feel sorry for myself. I'm Addison Forbes Montgomery Shepherd, well-respected neo-natal surgeon, and my patients need me.' That didn't make her feel any better either.

'Alright Addie,' she told herself, 'just put on a brave face, pretend like nothing happened, and no one will know the difference.'

She just hoped no one had heard her conversation with Mark because she didn't feel like answering their questions or being gossiped about.

Little did she know, one of the last people she would have wanted to tell, Meredith Grey, was in one of the nearby doorways and heard every word. She knew something was obviously going on between the Shepherds since Addison was staying at her house, but she had no idea how big it was.