Even If the Demon King Switches Genders, He’s Still Out for Revenge, Duh

Warning: The demon king Kima, who was originally married off and became the male protagonist's main wife, became obsessed with women and died by the hero's sword. Transformed into a succubus, she abandoned her demon king dignity and submitted to the ignorant hero, attempting to infiltrate the enemy camp and steal the hero's woman... The obedient succubus, in the instant the hero turned away, stared fiercely at his back, thinking to herself, "The power will come, the harem can be rebuilt, and revenge will be taken." [Lan Yubian]