Dagney and Francisco
Dagny Taggart and Francisco d’Anconia (Atlas Shrugged)
“Francisco found it natural that the Taggart children should be chosen as his companions: they were the crown heirs of Taggart Transcontinental, as he was of d’Anconia Copper. “We are the only aristocracy left in the world—the aristocracy of money,” he said to Dagny once, when he was fourteen. “It’s the only real aristocracy, if people understood what it means, which they don’t.”
He called her “Slug”, and she was the only one who could get away with calling him “Frisco”.