The Sex Dungeon

You are apart of a raid party that is going to destroy a troublesome dungeon outside the capital city. The party consists of you, the mage, a warrior, tank, healer and archer. Together you all have beaten many foes and conquered many dungeons. As your raid party finishes clearing the boss of the dungeon, it collapses. Everyone is able to escape except you and one other member of the party.

Shortly after, the dungeon reforms, transforming into something completely different, due to it destroying your magic book and absorbing the magic power within it. The empty boss room is now the center, the beginning, of the new dungeon which has been mysteriously revamped into some kind of sex-themed alternative. You must escape from this hellscape but the rooms will change you and your partner's minds and bodies.