Thanks for all the reviews you guys. I'm going to try and clarify all the relationships in this chapter. Hope you like it.
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"Derek, we need to talk."

Derek looks over at Meredith and can see the hurt in her eyes. Suddenly her pager goes off.

"That's Bailey. I've got to go."

"Mer, wait."

"We can talk later."

Without another word she walks off. Derek looks at Raven and then back at Rachel.

"So, we need to talk."

Raven turns to look at Mark.

"Can you watch her for me? Or at least take her to Addison?"

"But mommy! I want to stay with daddy."

"Well, you'll have to work that out with daddy."Rachel starts to pout, and gives Mark her puppy face that she knows he can't resist.

"I can watch her. If anything comes up I'll take her to Addie."

"Thank you."

"Bye mommy!"

"Be good."

"I will!"

She follows Derek into an on call room and he immediately starts pacing as best he can in the small room.

"How could you not tell me?"

"Derek."

"No. Why didn't you tell me?"

"I don't know. Ok. I don't know."

"Why now? After four years? What made you decide to tell me now?"

"She's sick. She has leukimia and she needs a bone marrow transplant."

"She has leukimia?"

"ALS. She was diagnosised a year a half ago. She just relapsed last month."

"You're not a match."

"No."

"And you're hoping I am."

"I don't want anything from you. I'm not asking you to be in her life, I'm not asking you for money. All I'm asking is for you to save her life. "

"If you let me be in her life."

"What?"

"I'll do the transplant, but I want to be in her life. I want her to know who I am."

"Why?"

"I'm her father."

"No Derek, you're not. You're the guy that got me pregnant. Nothing more."

She storms out of the oncall room slamming the door behind her.
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Meredith sees Raven walk out of the oncall room and takes the oppertunity to talk to Derek. When she walks in he's sitting on the bed with is head in his hands.

"Hey."

"I didn't know."

"What?"

"About Rachel. I didn't know. She never told me. Not until today at least."

"Oh."

Meredith sits down on the bed and lays her head on Derek's shoulder.

"It was four years ago. The night I caught Addison with Mark. I hadn't planned on sleeping with her. I hadn't even planned on staying. I was just going to tell her and leave."

"That Addison cheated on you." Meredith says this as more of a question than a statement.

"No. That Mark cheated on her."

"Why are you telling me this?"

"So you know I wasn't hiding anything else from you. I want us to be okay."

"We are okay Derek. Its not your fault she didn't tell you. I can't be mad at you for that."

"Ok."

"Why did she decide to tell you now?"

"Rachel has leukimia and she needs a bone marrow transplant. Raven's not a match."

"And she's hoping you are."

"Yeah."

"So, what are you going to do?"

"I don't know."

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Raven walks into Mark's office to find him lying on his couch and Rachel no where to be found.

"Where the hell is my daughter?'

"I got paged so I took her to Addison."

"Oh."

"It went that badly."

"Derek is an ass."

"What did he say?"

She sighs and sits down next to Mark on his couch.

"He wants to be in her life. And that will just complicate things. What am I supposed to tell her?"

"Is he going to do the transplant?"

"I don't know."

She looks down and tears start to form in her eyes.

"Hey, don't cry. He pulls her into his lap and wraps his arms around her. He'll do the transplant. He wouldn't be Derek if he said no."

"But what if he does. What if he says no? I can't lose her Mark. I can't lose her."

She buries her face into his chest and starts to cry.

"Ray, please don't cry. You know I don't know what to say when you cry. I can handle you mad and screaming, but crying as never been my thing."

This gets a laugh out of her and she looks up at him.

"What are we doing?"

"What do you mean?"

"I mean us, what are we doing?"

"We could be giving us another shot."

"How do I know I can trust you? How do I know you won't hurt me again?"

"You just have to trust me."

She sighs.

"I think I can do that."

Okay so I had some trouble with this chapter. I know it wasn't that great and kind of a fillter but I wanted to clarify everything and I had trouble making it flow. So I hope you like it. I promise the next chapter will have more of a plot to it. Please read and review.