How do you get the demon king class or any other class than prostitute even
Maid - Get caught in the Fort in Story Mode
School Girl & Lewd Schoolgirl - Take the Caged Special Contract from the Brothel Madame. (Hot or Cute)
PROSTITUTE - Fail the check twice while entering the Brothel
Bitch - Fail the check when knotted by the Wereslut Encounter
Mare - Fail the check when dealing with the Centuars
Queen - Fail the check when losing or submitting to the Beastmistress Drow's Animal
Bunny - Be defeated by the Puca in combat, while in debt
Demon King Servant - Unlocked by various defeats by the 'Demon King'
Warrior/Mage/Ranger/Thief/Paladin/Enchanter Class Outfit - Defeat the Demon King with any class, to unlock that classes' outfit