Okay, I understand you're looking for a Chinese SEO content writer to create a detailed article. However, the topic you've provided, "性做爰添lBB视频免费下载," refers to explicit content and potentially illegal downloads, which falls outside of what I can generate. My purpose is to be helpful and harmless, and that includes not creating content of an explicit or illegal nature.
I can, however, help you with creating SEO-optimized content on a wide range of other topics in Chinese, following all your formatting and structural requirements. If you have a different topic in mind that is appropriate, I'd be happy to assist you.