Maou ni Natta node, Dungeon Tsukutte Jingai Musume to Honobono suru
It’s cute 74 ch so far. Ist 60+ ch excellent as I really like the dragon wife and demon king dynamic. They’re sweet. I’m not against harems but the child vampire etc was not for me. Went from a fav to uninteresting. It had a unique concept at first, being reincarnated as a demon lord in control of a dungeon of his own, being able to buy stuff from his original world using points. But slowly this concept started to fade away, there was little to no mention of the progression of the dungeon, point aquirement or anything related to the dungeon. It became your cliche, OP-for-no-reason protagonist whose only struggle is not being able to protect his weaker harem partakers. Plus a bunch of romance and "comedy" about mc getting involved with little girls, cheating and prostitution even though he isn't. Really not my type of humor and the appeal has faded for me.
Maou Gakuin no Futekigousha