Izzie's POV

After nineteen hours of marriage, Alex and I had our first disagreement. Mark deserves to know about the baby and I have to tell him by myself. Alex didn't want me to do this, not yet and certainly not alone. After gently explaining to him that I felt I owed it to Mark to tell him myself, just like Kelly had owed it to him, he caved.

I stand in front of his room for what seems like hours, but is in fact only minutes. I finally find the courage to knock.

He looks like he has just woken up, his hair is a mess and his shirt is wrinkled somewhat. The moment I see him, I wish Alex had come with me. How am I supposed to do this? Just blurt it out or do I ease into it slowly? I guess I had better figure it out quickly. If I stand here too long without saying a word, who knows what he will think.

"Hey." He doesn't say anything, just moves aside to let me in. "We need to talk about something."

The corners of his mouth lift slightly, offering me a small smile I wasn't expecting. "Congratulations on the baby Izzie, you and Karev must be excited."

I'm stunned. "How did you know?" A knot forms in my stomach, whoever told him will have to deal with me and my surging hormones.

"Last night, Karev's ex showed up here in tears. She told me you were pregnant and she thought I should know about it." Heat rushes to my cheeks, that little bitch. "…and then I think she hit on me."

"I…I'm sorry, I wanted to tell you myself."

He shrugs. "It's okay, don't worry about it." He's taking this surprisingly well. I guess it is time to tell him the rest, the part Kelly does not know about.

I sigh. "There's more." He sits down on the edge of the bed and pats the spot next to him. I sit and take another deep breath. "Alex and I got married last night." He says nothing so I keep talking. "I want you to know, if you turn out to be the father…Alex and I both want you to be a big part of this baby's life. We would never try to take that away from you."

He actually laughs, I'm so worried about what he's gonna say next. "Izzie, I'm not the father." The calm tone of his voice has me freaking out a little. Aware of this, he starts to explain. "I had a vasectomy, a long time ago…after Addison." He didn't tell me the rest. He didn't need to. I already knew what he was talking about. Addison had an abortion before she left New York. "She said I wouldn't make a good father and I think she was right, so I went and had it done. No kid deserves a shitty father."

"I still want you to take a paternity test….just in case. It's not always effective and….."

He doesn't let me finish. "I have myself tested every year. I was tested right around the last time we had sex. I'll show it to you if you like and if it makes you feel better I'll take a paternity test when the baby is born, but I don't think it's really necessary."

"So there's no way….I mean you don't have any…" God, I sound like an idiot. I never thought I'd be standing in front of Mark Sloan, asking him about his sperm count.

"Swimmers?" He reaches out and takes my hand. "No, there is no way I'm the father." I let out a small sigh of relief; Alex is my baby's father. "You'll be a great mother Izzie. Karev is a lucky man and if he fucks it up…I'll kick his ass."

I smile, slip my hand out of his and rise from my seated position. "Thank you." I lean in and place a kiss to his forehead; he is a better man than he thinks.

I cross the room and open the door; I cannot wait to tell Alex.