I Voluntarily Fell into Being Your Plaything

In a world ruled by vampires, the entire world is divided into those ruled by vampire aristocrats and another type of ordinary humans who resist oppression and want to rise up. Those sealed by vampires will become vampire blood slaves. The blood slaves will maintain their own sanity but their bodies will be controlled by vampires and will have no freedom for life. Even as long as the vampire nobles think about some blood slaves, even their own sanity will cease to exist, completely becoming a puppet that can only be controlled. The cold and ruthless vampire king is obsessed with paranoia and hides his identity and becomes a blood slave. Sweet story. (The entire text is fictional)