What are the titles and subjects of the books Ender wrote. Why did he write each book?

The books Ender authored were called the Hive-Queen and the Hegemon. He wrote the Hive Queen in order to share the Bugger's history in the hopes that humans would learn to forgive knowing that they'd been forgiven. The Hegemon is Peter's story. Ender writes his brother's story because Peter had requested that "speak" for him.