Author's Note: thanks for reading and reviewing guys. Yes yes yes, to everyone who asked, what you want will come. Yes, cryptic enough for you??

Katherine grinned at most of the doctors on her way to the cafeteria. She was going to be an intern in less than two weeks. In the meantime, she was going to eat some nasty cafeteria food. And she was looking forward to it.

"Kat?" Derek asked, appearing at her side.

"Der?" she asked, tilting her head to the side. He looked the same as he always did, blue eyes sparkling and curly black hair shining.

"What are you doing here? In Seattle?" he asked

"Being an intern," she answered, focusing on his shoes. She was waiting for him to ask her how old she was, but he didn't. She looked up to see him nodding.

"Right right," he said, "Evelin called and told me." Evelin was Kat and Addison's mother. Apparantly she had kept in touch more with Derek than her eldest daughter.

"So," she said, "What do I call you now? Brother, ex-brother?" she smiled at him, her perfect teeth flashing.

"Call me whatever you want," he said, grinning.

"Ha, I should call you father," Kat said, laughing out loud. "Remember how you considered becoming a minister because med school was too hard?" she covered her mouth when she realized he wasn't laughing with her.

"Sh….I only told you," he said, looking around frantically to see if anyone had heard.

"Ah. Well, Im still calling you father," Kat said, grinning evilly.

"Kat!"

She turned and walked away. "Oh, you love me," she shouted back to him.

-----------------------------------

"So, sister, whats going on?" Kat said, taking a seat beside Addison.

"Im avoiding people." Addison replied flatly.

"Ooh, sounds fun." Kat mocked. "Who's that?" she asked, turning her head to watch Alex Karev walk by. He was resolutely ignoring Addison, but he smiled warmly at Kat.

"Don't even think about it," Addison said, looking down. Kat turned and was surprised to see that Addisons face was a brilliant shade of scarlet.

"What in the –" Kat smiled. "You like him, don't you?"

"No," Addisons head snapped up. "He's just a manwhore, that's all. Addison was hoping to god her face wasn't as red as she thought it was. It was bad enough when even Mark noticed that she had a thing for Karev. But her baby sister was different.

"Really?" Kat said, fluffing her hair. "I like manwhores."

"Then you can have him," Addison said, jerking her head in Mark's general direction.

"Ooh, I think I will," Kat said, grinning. "Watch how I do," She stood and walked away from Mark to Derek's table, where he was sitting with Meredith and her friends. She kissed Derek on one cheek and Addison laughed. Meredith was turning red and Mark was watching. When Kat had bent to kiss Derek, her raven hair had caught the light, making Mark look her way.

"Hey father," she giggled. "Have a good day."

She turned and walked away, her hair swinging in time with her hips.

Meredith glared at Derek. "Father!?!?!"

Addison laughed and watched Mark follow her out. Her sister was the master. Now the master could help her with her problem. Alex…

--

Mark followed Kat out of the cafeteria and down the hall. She stopped at the nurses station to look at a chart. Mark stopped and pulled the chart out of her hand.

"Hello," he said, extending his hand. "Im Mark Sloan."

"Kat Montgomery," she said, shaking his hand.

"Montgomery?"

"Yes, Addison's sister," she explained. He smiled at her warmly and put an arm around her waist.

"May I treat you to lunch, Kat?" he asked

Kat smiled into his perfect face and nodded. He led her back into the cafeteria, and again, all eyes were on her.