The way I see it, prophecy isn't a clean set of instructions; it's a messy, coercive force. It boxes characters in. Like, their choices are predetermined by some cosmic script, and the tension comes from watching them struggle against it. In 'The Song of Achilles,' you get this sense that the prophecy about Achilles’ glory and death is this unchangeable track, and Patroclus is just dragged along. The 'destiny' feels less romantic and more like a prison sentence they both have to serve. It makes the quiet, personal moments hit harder because they’re stolen from a predestined tragedy.
That struggle for agency within a fated bond is the real hook for me. It asks if love can even be authentic if it was foretold. Are they drawn to each other because of genuine feeling, or because some oracle said they had to be? That doubt can poison a relationship, which is a fascinating angle for darker, obsessive pairings. The prophecy becomes the ultimate third party, an invisible, jealous rival no one can escape.