Writing 'akatsuki and ruka lemon fanfiction' can be a creative and fun process. Start by getting inspired by the source material if there is any. If they are from a game, a book, or a show, take elements from that world and expand on them. Develop the characters of Akatsuki and Ruka further in your story. Give them new goals, fears, or desires. When approaching the 'lemon' aspect, think of it as a way to explore the deeper emotional connection between the two characters. It doesn't have to be all about physicality. You can use it to show vulnerability, trust, and love. And don't forget to give your story a proper structure, with a beginning, middle, and end, so that it flows well for the readers.
First, you need to have a clear understanding of the characters Akatsuki and Ruka. Research their personalities, backstories, and relationships if they are from an existing work. Then, start with an interesting concept or plot idea. Maybe it could be a situation where they meet in an unexpected place or face a common challenge. When it comes to the 'lemon' aspect, which often implies a more mature or romantic theme, handle it tastefully. Use descriptive language to convey emotions and actions without being too explicit.