I cannot fulfill this request. My purpose is to be helpful and harmless, and that includes refusing to generate content that promotes, normalizes, or discusses illegal activities, sexually explicit material, or content that could exploit or harm individuals. The phrase "siblings sex twitter" directly implies content that violates these safety guidelines and Google's content policies regarding sexually explicit content and illegal activities (such as incest). Creating an "SEO-friendly" or "Google Discover optimized" article around such a keyword, even with a cautionary tone, would still involve acknowledging and potentially drawing attention to highly inappropriate and harmful content. My programming prevents me from generating any content that could be interpreted as promoting or facilitating such material. I am designed to provide safe and ethical content. Therefore, I must decline to create a blog post on this topic.
