A/N: I was at a boring seminar last week and this plot hit me suddenly. And I started writing immediately once I got home. :) Basically Burke and Cristina got married at season three, but a few years later they got a divorce. In other words the AU started right after the finale of season three. As I wanted to make this a happy fluffy piece, the shooting and the plane crash and the car crush... never happened. Seattle Grace is still Seattle Grace, and Lexie, Mark and Derek are still alive! Yay! I will try my best to update regularly. As always please read and review!

Chapter 1

2017 Seattle Grace Mercy West Hospital, Seattle

It is an unusually smooth morning for Cristina Yang, the interim chief of SGMW's Cardio-thoracic Surgery. Since Maggie Pierce left for a job offer in Zurich, and Teddy left for the army with Owen, Cristina has basically been running the department. Everyone knows that it is just a matter of time before she actually become the chief of Cardio.

Cristina walked down the hallway of CCU with a bunch of interns following her. It seems like today is her lucky day: her brainless interns are answering every question correctly, her patients are all recovering steadily, McDreamy finally decided to give up his job in DC, which means she no longer needs to hear Meredith whining, and she can spend the rest of her day in the OR. How great is her day? If Cristina is someone who hugs, she must be hugging everyone in her sight today.

Though her lucky day kind of ended at 10:24am, by Dr Bailey the chief of surgery.

"Cristina, we've got a heart donor in Portland Gen. Can you go there and bring it back?" Bailey ran to Cristina and handed her a patient's chart.

"It's just an organ harvest! You can send any fifth year resident! Shane can do it, or… Wilson? She is quite good. Anyone but me. I've got a full OR schedule today." Cristina quickly skimmed through the chart and gave it back to Bailey while rolling her eyes. She took a quick look at the OR board and added, "Or you can ask Mer to go harvest the heart. I know we both hate a chirpy Meredith."

"As much as I love to see Grey pissed off, no, you are going to Portland Gen." Bailey coldly rejected Cristina's suggestion. Cristina followed Bailey down the hallway and asked,

"With all due respect Dr Bailey, I thought I am the chief of Cardio! Isn't it supposed to be a resident's job to harvest an organ?"

"Let me remind you something Yang, you are the interim chief of Cardio only, not the chief. Second, you might be the chief of cardio, but I am the chief of SURGERY, I outranked you so you need to do as I say. Now get your ass onto a plane and return with a heart as soon as possible. Do you understand?" Bailey stood in front of OR2 with her arms on her waist. Cristina stared at her for a minute, and walked away defeated.

"Hey! You can take Shane with you if you want help!" Bailey yelled at Cristina's back, who replied her mentor with a whiny noise.

Surgical Floor, Portland General

"So later when we get in there, Brainy will do the assessment, and Shane you will be harvesting the heart. Remember to…" Cristina yawned as she assign her intern and her resident duties. It is just another boring harvesting (not even half as fun as her left ventricle reconstruction, which she should be doing right now), so why not let her suck-ups do all the work?

"To check there is no lacerations in the four chambers and the aorta, to preserve at least 4 inches of the blood vessels for transplant and to make sure the coronary blood flow is normal. Got it Dr. Yang."

"Good. Observe and learn, Brainy." She nodded appreciatively at the resident as she walked into the OR, and dropped her jaw onto the ground.

"10 blade." A tall, dark man was already standing right next to the donor and is ready to make a cut on the donor's chest.

"What the hell?" The intern nicknamed Brainy screamed, asking the same question for Cristina and Shane. The whole surgical team turned and look at the three of them, including the surgeon. As soon as he landed his eyes on Cristina, he frowned.

"Cristina."

"Burke." She couldn't move her eyes from him and whispered his name. The name that haven't been said for almost 5 years already, since the day they finalized their divorce papers.

Inside the conference room, only the voices of the two world class cardio surgeons could be heard. None of the interns or the residents dare to say a word.

"I see that time may passed but you still haven't changed a bit." A classic Preston Burke style sarcastic smile.

"What is that supposed to mean?"

"Nothing, just saying you are still a surgery thief, except you are stealing organs instead of surgeries now."

"Oh don't you dare accuse me of that. You haven't changed a bit too. Still arrogant and pathetic."

"Me? Pathetic? You must be delusional."

"Oh you aren't? UNOS called me and told me I've got a heart. But when I arrived you are already holding a scalpel in your hand! Now you are just doing everything to rob that heart from me. If that isn't pathetic I don't know what is."

"Like I said, I got a call from UNOS too, and I got here before you. That makes you the heart thief!"

The two surgeons stared at each other like they are going to rip their throat open. Just before they actually do that, a woman walks into the conference room. She look around the room quickly and focused on the two surgeons. Then she busted into laughter and creeps everyone out.

"Oh my god. This is definitely the best drama I have ever seen in my life. It has been a long time since I last saw you two, isn't it Dr Burke and Dr Yang? It's just Dr Yang now right?" As she finished, she couldn't help but giggled a bit.

"Erica." "Dr. Hahn." They greet the woman respectively.

"Alright, let's get back to business shall we? I heard that UNOS have informed both Seattle Pres and SGMW that a heart is available. Sorry but didn't it sound oddly familiar to you Preston?" Erica scanned through the records and said. She smile devilishly at Burke as she recalls something from the past. She then continues after receiving a death glare from Burke.

"So here's the thing. UNOS made a mistake with their records. Two separate phone calls were made at the same time by two staff. There is actually only one heart available. And UNOS gave us, Portland Gen, the power to decide who gets the heart. Since I have experienced something like this," She glared at Cristina and Burke in the middle of her announcement, "I decided I will completely judge by looking at the chart only. No labs needed to be fake and no LVAD wires needed to be cut this time."

"Oh geez. You are never letting that go aren't you?" Cristina rolled her eyes and whined.

"Of course." Erica replied fiercely as she finished reading the both charts. "Back to this case, I am going to give the heart to Seattle Pres. It's yours now Preston."

"What the freaking… Hey! I thought you hated him!" Cristina screamed angrily at Hahn, who shrugged and said, "Yeah, of course I hate Preston Burke, but the fact is that his patient has a high risk of pulmonary edema. That makes his patient more urgent than yours. Sorry Yang."

Cristina stared blankly at the ceiling. She doesn't care whether Bailey is going to kill her or not, the only thing she care is the cocky grin on Burke's face. If they are not sitting in a conference room with interns watching, she might actually punch him in his face.

"Looks like you are never going to surpass me, Cristina." Before he left the room, Burke stopped briefly and whispered into Cristina's ears. In her angry glare, he headed towards the OR with a big grin on his face.

"Dr Yang, anything happened between Dr Burke, Dr Hahn and you before?" The intern, Brainy approached his attending and asked curiously.

"Shut it, you are Nosy now."