Help! I Think We Summoned A Demon King

[Warning: 18+ CONTENT AHEAD]Primordial Demon King of mischief, bored out of his mind, and unable to grow any further in strength on the highest plane of hell; decides to escape that place by initiating a summoning of his primordial soul into a different plane of existence.He burned his own immortal and primordial essence and body as fuel in order to ignite the summoning ritual he had spent epochs perfecting.However, the summoning ritual didn't go quite as planned, as his soul is caught up in a different summoning which pulls it into the body of a young man who was summoned with his group of classmates to a different world and in a different dimension to help vanquish the demon king that plagued that world.As luck would have it. The one thing the primordial demon king of mischief has been searching for; a means to become stronger than he ever was; he has found on this new world.Now, using his Authority-Level abilities... He will do whatever it takes to achieve his new goal. All the while living a life he has been deprived of for epochs, a life deserving of a true primordial demon king of mischief.He will extract your most deeply buried desires..._______________Authority Of Mischief.. Desire. ~~~~~~~~~~If only I could find a dck big enough to fill me up.~~~~~~~~~~_______________He will gladly fulfill your desires.... for just a little price, of course...________________Subject's Desire Has Been Met...Authority Of Mischief.... Fulfillment [Awakens...]Authority Of Mischief.. Fulfillment Resonates with Authority Of Mischief.... DesireAuthority Of Mischief..... Fulfillment is Reading Subject Of Desire...~~~~~~~~~~Replicating Most Potent Constitution Of Subject Of Desire...Successfully Replicated Divine Skill [ Infinite Penetration]...Now Generating Seed Of Subordination....Seed Of Subordination Successfully Deposited In Subject Of Desire...Time Of Germination For Seed Of Subordination [14DAYS: 10HR : 4MIN : 7SEC]~~~~~~~~~~_______________Now those who thought they have summoned a hero to save them; will themselves soon need saving from this hero.