Fantasy: the Demon Lord of the Four Realms, I Am the Leader of the Demon Lord

The prophecy says that the demons are just tools for the training of human warriors and will perish sooner or later. Why is Qin Tian also one of the kings and the demon king becomes a tool? Then I will be promoted to the Demon Emperor, Demon Emperor, Demon King. Of course, I can break the prophecy and enslave the protagonist. After all, the succubus of the demon clan cannot be resisted by ordinary people. Qin Tian, ​​who is a human being after all, understands that the inner demon is not an ordinary demon. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.