A/N: I just want to say thank you to the three people who reviewed! Please R and R..

Summary: Completely AU. After a long time of confusion and wanting, you get what you want and find the one you love. You marry that person right? What happens when you forget the last five years of your life before you get to? McStizzie.

X-x-x-X--Xx-x-x-x-x-x-xXXXXXXXx-x-x-x-x-x-xX--X-x-x-X

Izzie was sitting in a waiting chair across from his room. The man she loved. The man that couldn't remember her.

The doctor had told her and her friends that he couldn't remember the last five years of his life. He would get his memory back, but not to push him or tell him things to soon.

He wouldn't remember her. He wouldn't remember her… At all. She stared at the empty room.

The doctor had brought him up to make sure everything was alright with his brain.

She hoped that everything as okay. She hoped that maybe his memory from the past five years would come pouring back and he would remember her. He would remember, he would kiss her, he would tell her he loved, he would say that he couldn't wait till their wedding day.

Her breath hitched in her throat. It was possible. It was possible for him not to remember on their wedding day. They wouldn't get married. He wouldn't even know. He wouldn't say he loved her and tell her that he wants to spend the rest of his life with her at the alter. It wouldn't even happen.

Her thoughts were racing, and tears sprung to her eyes once again that day.

She felt a hand on her back. It was her friend. She had just got back from out of the city.

"Izzie. He's back from getting checked out." Meredith told her softly.

Izzie nodded, she stared forward. She waited. Waited for the doctor to say he was fine, and maybe even that he somehow, instantaneously got his memory back or her, the engagement, everything.

"Ms. Stevens." The doctor said after she had walked up to her.

Izzie stood up. Looking at her doctor, with painful, hopeful eyes. Urging her to tell her. Tell her something good.

"Everything seems to check out fine." The doctor told her, glancing at the others nearby. "I think he should go home with someone he would of known in the past." He informed them.

She knew. She knew from the moment she knew he couldn't remember, her that he wouldn't be able to come with her. She didn't want to think about it. She didn't want to think about him not holding her tonight. Not hearing him say that he loved her. It just killed her to think about not having him do any of those things.

"I guess that would be me." Derek said nodding. He was the only one who knew him five years ago. He knew he might know Addison, but probably barely.

Addison and Derek started dating five years ago, but broke it off mutually a year later. Addison started dating a vet who she is still seeing today. After the brake up, Derek took a brake from dating, that is until Mark started dating Izzie a few years later. He met Izzie's friend Meredith and they instantly clicked, and to this day they are still dating.

Izzie glanced at Derek and nodded a little. She kept her focus on the ground. She didn't want to face the facts. The facts hurt and he wasn't even there to tell her everything will be okay.

Derek watched her nod before walking to the door of Mark's hospital room.

Izzie closed her eyes, holding back tears. He wouldn't be able to see her for awhile. He didn't remember her. He needed to remember her to see her again.

Derek opened the door and peeked in.

Mark was pulling his shirt down. He had already gotten the rest of his clothes on that the nurse had given him, along with a small bag of his things.

"At least your decent." Derek said, trying to lighten some things up. Though he knew this would most likely be a long ride until he finally remembers everything from five years past.

Mark looked at Derek. "I am." He stood up and picked up his bag. He was a little sore, but the doctor said it would get better in time. He couldn't get that blonde woman out of his head. She had kissed him. Was she his girlfriend? He missed five years of his life. Five years he could of seen and known of her. He thought maybe he'd hold off on that question for a little bit. "Are you still with Addison?" He asked, that was the last thing he remembered. He remembered meeting Derek's new girlfriend.

Derek looked at him a bit surprised. He remembered Addison, well, at least he knows of where his memory might be at the moment. He shook his head. "No, but we're still good friends."

Mark nodded in understanding. He couldn't contain the curiosity about the beautiful blonde who he knew he probably knew within the years he which he had lost his memory from. "Who was the blonde woman?" He asked, wanting to know.

Derek looked at him. He couldn't tell him. He had to remember on his own. "When you get your memory back, you'll know." He told him knowingly.

Mark sighed, but then nodded. He didn't know why he wanted to know so badly, but he did, and it seemed to slowly kill him inside trying to figure it out.

Derek thought it'd be best to inform him of the situation of him staying with him. "The doctor thought it'd be best for you to stay with someone you remember, and obviously, that's me." HE said with a small smile. He knew that trying to lighten anything in this situation was a long shot, but he wasn't above trying.

Mark nodded. He just hoped that he wasn't going to shove memories down his throat. He wasn't going to be the one to get strangled if that happens that's for sure. Figuratively speaking of course.

XXXXXXX

Izzie had just been staring at the door. Hoping that maybe he'd just come out and say that he remembered, everything. All these hopes of that happening were fading. She was closer and closer to facing reality, and like she predicted, it killed her, and it hurt more than she could take it.

Addison and Meredith looked at each other, thinking the same thing.

Addison looked at Izzie. She softly put her hand on her forearm. "Come on Izzie." She said gently.

Izzie stared at the door for a few moments before looking at Addison. She didn't want to leave, but she knew if she didn't, he would walk out of the room and not know who she is. That killed her more than leaving all together. She gave her a barely visible nod.

Addison put that hand on her back, leading her away from the room.

Izzie gave the room one more look. She reluctantly looked away, closing her eyes. She allowed Addison and Meredith to walk with her out of the hospital.

XXXXXXX

"This place hasn't changed much." Mark said as he stepped inside Derek's penthouse. It was easy to remember the place. Derek hasn't gotten a new one in the last, well now, six years apparently. The same furniture he could just see from where they were near the door. Same small family picture of his family hanging on a wall nearby. Exactly the same.

Derek nodded as he came inside himself and closed the door behind him. "My taste hasn't changed, that's all." He said, trying to find an excuse why he wouldn't have changed it for six years. He really didn't know why himself either.

"Right." Mark said not believing him. "Guest room still in the place then?" He asked looking at him. When he saw Derek nod, he made his way to where it was. He opened the door to the room, and again, exactly the same. He walked over to the bed to put his suitcase on it. He really had nothing better to do then unpack.

Derek and him had stopped by his place to get some clothes for him. He still didn't completely get why he was even staying with him. It's not like he couldn't cook or do regular things. He just had amnesia, which sounds pretty bad to say now. When he stepped inside the place, he felt a sense of unevenness, something didn't seem right, it was like something was missing. He just didn't know what it was that made it that way, or that was missing.

Mark clicked open his suitcase. He turned his head and saw Derek walking in.

"Unpacking? Nothing better to think of?" Derek asked, once again, trying to lighten things up. He knew he should stop trying to do things like that, nobody got anything out of them.

Mark looked back at his suitcase, shaking his head. "Nope." He took out a shirt and threw it on the bed. He then saw a silver watch. He didn't remember packing that. He picked it up and looked at it in his hand. It's like time froze in a moment, something flashing into his brain.

FLASHBACK

Mark was sitting in his office, filling out some papers on his lunch break. It seemed like a slow day, and he didn't feel that hungry, so he thought of just finishing up some paperwork would help all of the slowness of that day. He suddenly heard a knock coming from the door. He looked up at the door. "Come in." He called out.

His blonde assistant opened the door. "Mark,-" He had told her from the first day she started working for him to call him Mark, and because she worked for him, that's what she did. "-I know it's your lunch break and I'm probably bothering you-"

Mark cut her off. "You're not." He offered her a smile.

She gave him a small smile back. "Since you gave me a card for my birthday, I thought maybe I'd get you something for yours." She told him. Today was his birthday, and she knew. She walked over to the front of his desk and handed him a box, it wasn't that small, but it wasn't big either.

Mark took the box and opened it, and in it, he saw a silver watch. It's didn't look all that expensive, but it didn't look all that cheap either. It was a nice watch. He smiled up at her. "Thanks. It's nice." He told her honestly. "I'll be using it."

She smiled at him. "It's not a problem." With that, she walked to the door.

Mark watched her walk out of his office. When she was gone, he leaned back in his chair and looked at the watch. It was a nice watch, and she was a nice woman too.

END FLASHBACK

Derek furrowed his eyebrows in concern. "Mark, you okay?"

Mark snapped back into reality when Derek said that. He shook his head, not taking his eyes away from the watch. "I'm fine." That was the blonde woman from the hospital. Was she his assistant? Then why did she kiss him at the hospital? Maybe she wasn't his assistant anymore? He hated the fact that he had so many questions, but no answers.

XXXXXXX

Izzie stepped into her place. It felt like him all around her. It was just this morning that they were here. That they kissed, and said they loved each other. It all felt like it's been taken away from her. All because of what someone else did. F that car hadn't of hit him, he would have been fine. He would be here beside her, but he's not, and it's slowly tearing her apart.

"Come on Izzie, lets sit down." Addison told her gently.

Both Addison and Meredith stayed with her, by her side to the living room. They watched as Izzie sat near the end of the couch. Addison sat next to her, and Meredith sat on the other side of Addison.

Izzie looked at the wall in front of her. "He doesn't remember me." She said in a whisper.

Addison put a hand on her shoulder. "He will."

How was she sure? No one could be. Izzie's eyes turned helpless as she turned and looked at Addison and Meredith.

Meredith leaned over and put a hand on her knee. "Everything will be okay."

Tears brimmed Izzie's eyes. "You don't know that." She said, her voice cracking. She shook her head until tears started to fall.

Addison glanced at Meredith, but then looked back at Izzie. She pulled her into a hug.

Each one silently prayed that he would remember, because really, how much could Izzie take having the love of her life not remember her?