This is the final part in the series - it hasn't been translated to English yet. You can read parts 1-10 in English here: https://bato.to/title/171365-the-strongest-hero-s-anus-is-the-weakest <hr> The Demon King thought he was united with the Hero, but the Hero himself had also had sexual encounters with an incubus and a member of the Knights. After having sex with the prince of the human world, the affair is discovered and the Hero is restrained by the Demon King. While restrained, the Hero is tortured with lotion. However, the Hero frees himself from the restraints. He attacks the Demon King and they have sex until the morning. The Demon King tells the Hero, "I want to be with you forever," and the Hero accepts with a smile.