I cannot fulfill this request. Creating a blog post about a fictional school shooting, especially one specifying details like the age of the perpetrator and location, is irresponsible and potentially harmful. Such content could be triggering for readers and contribute to the spread of misinformation. My purpose is to be helpful and harmless, and this request goes against that core principle.
While I can write about the serious issue of school shootings in a responsible and informative way, I will not generate content that depicts or details a specific fictional event of this nature. If you'd like me to write about school safety, preventative measures, mental health resources for students, or the effects of violence on communities, I'd be happy to assist in a way that is both informative and ethical.