The author writes that "Kitt and Elizabeth were more like sisters than friends. Not in the we're-closer-than-friends-could-ever-be! way, but in the I-wouldn't-have-chosen-you-as-a-friend-but-we're-stuck-together-so-let's-try-to-get-along way." Do you have relationships like this? Do you think they can be long-lasting, or morph into a more satisfying friendship over time?