How does the author use foreshadowing in A Sport and a Pastime?

Above anything else, the narrator is fascinated by Dean's relationship with Anne-Marie. In some ways, he lives vicariously through Dean's sexual exploits. The relationship is fundamentally and irreparably unequal. Anne-Marie is, more or less, a normal girl. She wants a man who loves her, a happy family, and a comfortable income. Dean, on the other hand, who feels himself superior to such mundane ambitions, is interested purely in domination. He wants to make Anne-Marie completely his but he wants to give nothing of himself in return. Dean knows such an unequal relationship cannot last long and thus it is characterized, especially towards the end, with a sense of impending doom.