Demon Slayer: The Demon King Wants to Build A Harem

{A/N: First World: Demon Slayer X Naruto X Jujutsu Kaisen} {Second World: ????} Muzan Kibutsuji, after being killed by the Hashiras, reincarnated in the modern era and discovered that his entire life story, from birth to death, was part of an anime called "Demon Slayer." Surprisingly, he became an otaku. However, he dies again just as he was about to fap-fap to a hentai and is reincarnated moments before he killed the doctor who made him a demon—the only one who could have made him immune to the sun. This time, Muzan is determined to become immune to the sun, considering the hardships he faced without it. Despite his bloodthirstiness, he refuses to kill the only person who can grant him immunity. Even if Muzan becomes immune to the sun, the biggest plot twist is that the Demon King now wants to build a harem. {A/N: This fic will be filled with smut, and don't worry, the MC won't become a simp or anything, but will have a really big harem. Please leave a comment or two to motivate me! And the harem won't grow mindlessly, The harem members would have character development before they fall for muzan}