Deserts possess a particular magic, since they have exhausted their own futures, and are thus free of time. Anything erected there, a city, a pyramid, a motel, stands outside time. It's no coincidence that religious leaders emerge from the desert. Modern shopping malls have much the same function. A future Rimbaud, Van Gogh or Adolf Hitler will emerge from their timeless wastes.
First she would try to kill him, but failing this give him food and her body, breast-feed him back to a state of childishness and even, perhaps, feel affection for him. Then, the moment he was asleep, cut his throat. The synopsis of the ideal marriage.