Hopefully, the Demon King in The Abyss is friendly enough, but if not, then Lance will have to take matters into his own hands and temporarily take over the Demon King's forces.
In a place of chaos and disorder, strength is respected.
As long as one is stronger than the Demon King and can crush the Demon King, one can become the new Demon King.
He wasn't particularly interested in being the Demon King; it would be best if he could cooperate with the Demon King, though in the end, it might still have to be settled by force.
Giving gifts or money would not only fail to win the Demon King's approval but might also lead the Demon King to think of one as weak and easy to bully.
Paradise.
It was an ancient city ruled by the succubi.
Named "Paradise," this city was indeed a paradise for most male members of the Demon Race and those of the opposite sex.