They say you cannot love two people equally at once,โ she said. โAnd perhaps for others that is so. But you and Willโyou are not like two ordinary people, two people who might have been jealous of each other, or who would have imagined my love for one of them diminished by my love of the other. You merged your souls when you were both children. I could not have loved Will so much if I had not loved you as well. And I could not love you as I do if I had not loved Will as I did.
Cassandra ClareI don't think I ever intended specifically to write for the young adult market. It's just that when the idea for City of Bones came to me, I knew the main characters were teenagers. In my mind they were just very clearly the ages they were, which turned out to mean it was a YA novel.
Cassandra Clare