A Former Brave Resident in the Dungeon (Dungeon Kurashi no Moto Yuusha)
This seems to be an R-18 novel with a dungeon master twist. The protagonist lures the victim to the dungeon and humiliate them in order to generate negative emotions to power the dungeon core.
After killing the Demon Lord, Blum Dilmond was pursued by the kingdom and forced to leave the country. While spending days trying to avoid the assassins aiming at his neck, he suddenly came up with an idea. He could hide inside the dungeon that was once the Demon Lord’s hideout. If it’s there, then he could be safe.
Without hesitating Blum went into the dungeon, but then he met someone unexpected in the lower levels, one of his former companions with whom he fought side by side against the Demon Lord. Moreover, a maid, called Irene, who once served the Demon Lord is also there. And so since their interests happened to match, the three of them decided to cooperate together to rebuild the worn-out dungeon, working earnestly in order to turn it into their own safe paradise.
I honestly would like more R-18 novel licensed but I'm not sure JNC is the right publisher for this kind of thing.