David and Ffion were rumored to be be a couple in the first two years of Oblivion's fame, but they were both carrying torches for other people. They were, however, the best of friends, and remain so.
Ffion was once Cressida Holdsworth's best friend but Cressida became her sworn enemy after Cressida started a relationship with Ffion's ex-lover for whom she was still carrying a torch.
Ffion and Lia become intimate friends, and, throughout the quartet, Ffion remains very close to the Piersons.
In the third volume, Living Timekeepers, it's revealed that Ffion and David's rapper friend, Sabre Tyson, are a couple. Ffion and Sabre collaborate on an off-Broadway musical called "Broken Birds" with David, Lia, Sphinx and Dane. It addresses the issue of marginalized children in the age of technology, environmental and food chain contaminants.
Sabre Tyson: Twin Flame
David Pierson: Kindred
Lia Bailey Pierson: Kindred
Ulysses Fearn Tyson: Son