[Crossover] I Transmigrated to a Parallel World and Became Wumian's Wife

[Updated daily at 6 p.m.] "You, human, no matter how many times you come back to life..." "I'll kill you every single time." "Ah, as expected, humanity's malice toward its own kind will never disappear..." "Sorry, Itadori, I came back to life again~" "Come play with you~" But to his surprise, he didn't see the skyscrapers of modern society. Just as he was about to step out of the shadows, "that lord" grabbed him. "Into the sunlight... Are you looking to die?" Muzan glared at the newly born demon before him, his cherry-blossom eyes wide. He had always been creating demons, searching for an omega (Ω) who could be his perfect match. As the Demon King (?), he naturally had alpha (α) blood to be proud of. Unfortunately, most of the demons he created were ordinary betas (β). So here's the question: between his beloved Rui and the newly born demon, who should he choose? "Honestly! This is no fun!" "Hmph. Don't forget, I gave you some of my blood." * When Muzan suddenly decided to let the little one fend for himself for a year, the one-year-old demon, Mahito, accidentally wandered into a certain mountain. When Muzan came back to look for him... The Hashira: (on alert) !? Don't go near him! Mahito naturally became everyone's darling. * Then, for a full ten years, the Demon King and little Mahito disappeared without a trace! * This story is also known as "I Got Snatched Up as a Wife Before I Could Find Itadori". ☆☆☆In this story, only demons have ABO traits!! Mahito's love (rival) interest (friend), Rui 1. An unhinged pairing! Mahito & Muzan! (aka MaMuzan) 2. I got the inspiration after seeing a video on Bilibili. 3. The author has only watched the Demon Slayer anime, but is caught up with the Jujutsu Kaisen manga, so Tanjiro probably won't appear. 4. Mahito won't become everyone's darling early on. He'll first appear as an adorable little Mahito! This part is just for Mahito fans, so if it's not your thing, feel free to read only the MaMuzan parts (mainly because I love Mahito so much!). Also, there'll be various transmigrations. The worlds confirmed so far are Demon Slayer, Bleach, and Sword Art Online (the rest aren't decided yet). Wherever he goes, Mahito will receive endless love. 5. A slice-of-life story. Theme: After being the top in that other story for so long, it's time to be pinned down by someone else.