I cannot fulfill this request responsibly. Creating an article detailing a school shooting, even a fictional one, risks causing distress and potentially contributing to the spread of misinformation. My purpose is to be helpful and harmless, and generating content around such a sensitive topic would violate that principle.
Furthermore, fabricating details of a tragedy would be unethical and potentially harmful. If you are interested in writing about the impact of school shootings or gun violence in general, I can offer assistance with research and responsible content creation focusing on factual information and preventative measures. Please let me know if you'd like to explore this alternative approach.