Demon Slayer Upper Moons x Oc stories

Muzan x Loona - Backstory

(Author's note: I watched Season 3 of Kimetsu No Yaiba it made me cry that last episode but we now have a good backstory on Muzan Kibutsuji I loved it!)

Present:
Muzan grinned; he finally found a demon that could conquer the sun after years of looking and searching he didn't need the Blue Spider Lilly anymore, Muzan laughed as he then killed the maid before walking out so casually once outside he met up with his wife Loona Kibutsuji; recalling the events of their past life as humans.

Past:
Muzan was inside his house, looking outside to the other people that were enjoying the sun; unfortunately he had a disease that he couldn't go outside because of the sunlight only at night. He sighed as his doctor handed him his medicine "Tell me, what will happen if I don't drink this?" Muzan looked at the doctor as he replied "Well you won't be able to live past 20 if you don't." He sighed before drinking the medicine; meanwhile outside Loona noticed Muzan she felt pity toward him that he couldn't come outside, so she walked over as Muzan laid down on the futon looking at the others hating them and wanting to destroy everything before Loona spoke with his doctor then kneeling down "I heard what happened, I'm sorry you can't go outside like the rest of us." Muzan looked up at the beautiful woman as she then smiled "But to be honest, I don't like the outdoors either I hardly go outside myself." "Is that right, I suppose we have something in common." He smiled slightly before Loona set a basket of fruit down "I picked these myself, they were going to be for my family but I figured you would want them." She smiled as Muzan was surprised by her generosity; a beautiful woman just happened to have something in common with him, "Thank you, what is your name?" "It's Loona Wolfbane."

The following day, Loona visited Muzan; they'd talk about life, outside, and people in general she would cook something for him when she visited he loved it her company of course and her kindness. Soon Muzan realized that his body was changing after he killed the doctor; he was turning into a demon, when Loona visited him she didn't turn away instead she touch his hand and smiled "I don't care if you become a demon Muzan I won't judge you, I'm willing to help you find the Blue Spider Lilly your doctor spoke of." Muzan smiled sighing "You have been very kind to me Loona, thank you." They had to leave everything Muzan killed humans, Loona didn't mind it she was starting to fall for him as he would rearrange the house he killed the family in as his clothes were bloody sometimes he even thought how Loona would react, but it turned out her reaction was calm as she wiped Muzan's mouth "You always make a mess, don't you think you should do the killing outside instead." Those words made him chuckle everytime; until the royal guards came.

That night the general called out "You demon whose violating the peace in this city will be punished!" Muzan turned around bloodied "Oh? You mean me?" The archers released their bows as he smirked pushing the arrows back in one motion, but however one hit Loona as she let out a gasp looking down at the arrow that pierced through her chest. Muzan turned around quickly "Loona!" He rushed over to her as she collapsed due to the blood loss "Muzan..." She reached up touching his cheek as he then set her down looking at the royal guards in rage "You all will die here!" In one swift motion, the guards all dropped dead as Muzan held Loona in his arms "Muzan...I'm not ready to die, please make me a demon." "Are you crazy? We haven't even tried that, you could die." He held her as Loona touched his hand "We won't know unless we try." Muzan thought for a moment, then he gave his blood to Loona as her human form disappeared only to be replaced by a demon opening her eyes to him as Muzan sighed in relief and hugged her "My Loona, my precious Loona." Muzan got down on one knee and held out a ring as Loona gasped covering her mouth "Loona since we met, you always stuck by my side I want you to forever be by my side for eternity, so will you marry me?" "Yes, yes of course Muzan." He smiled slipping on the ring to Loona's finger then they shared a romantic kiss as the rain poured down; from that day she was known as Loona Kibutsuji taking his last name.

Present:
Muzan hung his hat up to see Loona reading a book "So anything yet honey?" "I finally found what we've been looking for, a demon conquered the sun." The book dropped on the floor as she looked at him "You mean, we don't need the Blue Spider Lilly anymore?" He nodded as Loona jumped in his arms and he spun her around as they chuckled "This, this is exciting news Muzan we'll be able to conquer the sun once we have that demon." She smiled as Muzan held her "You and me for eternity, as I promised now, once we have that demon we'll be able to do whatever we want." They kissed as the candles flickered in the soft wind, the ultimate power couple were going to conquer the sun together.