" When you spend weeks on end close to another person, so close that you know every hiccough, every smell and every scratch on the skin, you either come out of it hating each other or so deep in each other's gut that you can't find a way out. Klara and I were both. Our little love affair had turned into a Siamese-twin relationship. There wasn't any romance in it. There wasn't room enough between us for romance to occur. And yet I knew every inch of Klara, every pore, and every thought, far better than I'd known my own mother. And in the same way: from the womb out. I was surrounded by Klara "
― Frederik Pohl , Gateway (Heechee Saga, #1)