You were the King's firstborn daughter; Princess Rhaenyra's older sister. Yet, while she was beloved by everyone, you were usually forgotten, left in the shadows.
Daemon had always loved both of his nieces. Still, he always seemed to pay more attention to Rhaenyra, just like everyone else. Until the day she was named the heir instead of him.
Viserys, Daemon's older brother, made Rhaenyra the Princess of Dragonstone when his newborn son died. Feeling upset to be discarded once again, the Rogue Prince got drunk, said stupid things, and ended up finding his way to you. You'd both been constantly overlooked by others.
That night, he took you. Not that it had been anything less than consensual. You were more than happy to sleep with your uncle, perhaps because of how little attention people gave you.
But, the next day, Daemon got banished for his comments about the King's dead son. He left, fighting in the Stepstones for three years. His wife died during that time, much to his relief since the two hated each other.
After his victory, the Prince came back to King's Landing, only to find you with a child. A three-year-old, in fact. A bastard, according to the court, since you'd never been wed. But while no one knew who the father was, Daemon sure did. And he was shocked.