Since the very beginning of Grey's Anatomy, Derek and Meredith has always been my favorite couple. I love them and I hated it when they were apart. I thought that Meredith really stood up for herself when she told Derek why he didn't have the right to call her a whore although Derek's responce made him see less McDreamy in the episode Damage Case.
MEREDITH: "Hey..."
DEREK: "How's my dog?"
MEREDITH: "Much better. Finn is running tests-"
DEREK: "Good. Good."
MEREDITH: "Our dog."
DEREK: "What?"
MEREDITH: "Our dog. You said my dog. He's our dog."
DEREK: "Yeah, whatever."
MEREDITH: "Are you mad at me or...