I'm not sure specifically which ones are the most popular. Fanfiction varies a great deal in quality and popularity. You could try searching on fanfiction - specific websites like Archive of Our Own. There might be some stories that stand out based on the number of views, bookmarks or reviews.
When writing your 'theon and yara lemon fanfiction', it's important to develop their characters further. You can give them new challenges that test their relationship. For example, they could be caught in the middle of a political intrigue where their loyalty to each other is questioned. Use vivid descriptions to bring the story to life. Describe their expressions, the sea breeze on their faces if they're on a ship, and their internal thoughts. This will make the readers more engaged in your fanfiction.
It depends on what you mean by 'true story'. If you're asking if it's based on real events, the answer is no. It might draw inspiration from various sources, but it's likely fictional.
In most cases, Yara is likely a fictional story. However, it could draw inspiration from real-life elements or themes and present them in a creative way.
Theon Greyjoy was captured by Ramsbottom.
In the novel A Song of Ice and Fire, Theon was the adopted son of the Duke of Winterfell, Eddard Stark. He was captured by Ramsbottom and imprisoned in Dreadfort.
While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!