Why most AI rushes a slow burn
Ask a general chatbot for a slow burn and the leads are together by page two, because it writes one scene at a time and loses the plan. A slow burn needs the opposite: a reason to wait and a writer that remembers it. Type the pairing and what keeps them apart, such as a rule, a rivalry, a secret or a promise to someone else. The follow-up questions cover what your setup leaves open, such as who notices first and what would finally break the rule.
Chapters that remember the near misses
Pyra is the default writer here, with a slow build, close detail and long scenes, though any writer can take the story. Set the heat and the chapter length, then write in the full app on a free account. Because the story keeps continuity, chapter eight still knows about the near miss in chapter two, the borrowed jacket and the thing neither of them said out loud. Tell it how many chapters the wait should last, and it holds back until then.