Isekai Harem Dungeon Master: Ero Trap de Himekishi Party & Maou wo Yarimakuri!  

異世界ハーレムダンジョンマスター～エロトラップで姫騎士パーティー＆魔王をヤリまくり！～

The protagonist was invited into a realm inhabited solely by females, including a Demon Queen who appointed him as Dungeon Master. His mission was to attack a group of the strongest heroines in the world. Although initially intimidated by his adversaries' beauty and power, he became excited about the prospect of using perverted traps and his large penis to capture them one at a time until they surrendered. Furthermore, he aimed to defeat the Demon Queen herself by bringing her to her knees.