Mark stared at Addison, his eyes expanded until they could hardly grow wider. His heart pounded his shaking chest, his hair rustling and messed-up. His mind became a tornado of questions, but on the outside, he was shaking and silent.

"What?" he choked, as if he had to hear it again.

"I'm pregnant."

Mark Sloan hadn't been expecting that. Of all things—of everything that could possibly happen, he hadn't expected Addison to be pregnant.

All he could do was stand there and splutter, disbelief shaking his whole mindset.

"You're not pregnant," he said, his voice broken and disgruntled.

Addison's face was frazzled, her soft eyes now hard with thought.

"This is…unbelievable!"

Addison still stood there, silent and unmoving, her red hair lying tangled and knotty around her thin head.

Of course, this should have been expected. After Mark and Addison had been…let's say, reunited, they should have known, after the countless encounters of sex. But it hadn't really been expected—or maybe even wanted, but they didn't consider that.

"I'm pregnant," she said, as if she hadn't said it twice before.

Mark just stood there, his pointy jaw opening and closing helplessly, gasping for air.

"Well, what do we do?" he squeaked.

"I don't know, Mark! It's not like I've ever been pregnant!"

"You sure?"

"Shut up, bastard."

"This will never work, Addison."

"Mark! We have to make it work! We may be the…oddest couple at Seattle Grey's, but we can make a baby work!"

"Addison…"

"Don't start with me, bitch!"

"Addison, what kind of mother would you make? No…even more—what kind of father would I make?"

"And now you're being all wise?"

"Do these odd emotions that just spring violently at me have something to do with the…pregnancy?"

"I don't know! I've never been pregnant, as I said!"

"ADDISON! WORK WITH ME! WORK WITH ME! I mean, what the hell could this baby offer? It's just the after-work of sex—probably drunk sex, no less. Why else wouldn't we have used protection?"

"I know, Mark…why didn't we use protection? Now I'm going to be fat…and lazy…and moody…and shit!—with you!"

"Man." Mark slunk into a chair, pushing hair from his face.

"Darn, Mark, we have to be together! Or we have to choose who gets the baby! As if that isn't obvious…"

"Addison, are you saying that this baby shouldn't have a mom 'n' dad?"

"Not with a bitchy dad like you."

"Why the hell have we been dating?"

"Well, I love you."

"WHAT THE HELL, ADDISON?"

"I don't know! It's sort of a…love-hate relationship? But now, having a freaking baby with you, I see who you really are. You've been cheating on me, haven't you?"

This only made Addison's face soar with unhappiness and confused expressions.

"Addison…"

"Fuck you! What are we going to do?"

"I'll leave." Mark's voice was small and fragile, his normally flirty or ravenous face set into a quiet, delicate expression, one that wasn't to be messed with—even more menacing than his "sex face."

"You'll leave?" Addison's heart thumped frantically in her chest, telling her that this was her man…her man! She shouldn't let him go! But it was a baby. She had to let Mark go. If Mark was a father, the child would be severely messed-up, clinically depressed or just…wrong. Addison, against her heart's will, nodded, tears choking her throat. Her mixed feelings for him, changing almost every second, made her just confused and feeling helpless. Just a minute ago, hadn't she been screaming curse words at him? But now—now?—she knew she loved him, in an odd way. She didn't know what she wanted to do…tears glazed her eyes, causing her to look away from Mark's crestfallen face. He hadn't expected her to agree.

"I guess I'll pack?"

Tears bounded across his words also.

"I guess you will," whispered Addison, a tear daintily poking its way down her cheek.

"I need to tell everybody I'm going," said Mark, slowly walking over to his bed, taking up his things.

"You do."

All Addison could do was agree with him, her usually strict or calm or…well, anything but this.

Anything but Mark leaving.