A Lion Loyal to Wolves

Princess Ariella Fawn Baratheon is the eldest daughter of King Robert Baratheon and Cersei Lannister. So why does she not resemble her father in any way? When the royal family travel down to Winterfell, King Robert arranges a marriage for her and Lord Eddard Stark's son, Robb Stark.
They get along pretty well, until the news of their impending marriage reaches them. Both at first are upset about the marriage, and start to dislike each other. But over time they start to fall for one another.