#Red String of Fate | Explore Tumblr posts and blogs

minimomoe · 4 months ago

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How to Train your Demon

Pairing: trueform! Sukuna x Fem Reader

Summary: Life has all kinds of wins and losses. You don't know which category to put your new demon husband in though.

Tags: MDNI!, red string of fate trope, true form sukuna, librarian reader, soul mates, reincarnation, accidental summoning, love at first sight (but it's one-sided (until it's not)), Sukuna is demon, but he's v much in love, smut and stuff eventually i guess....

Part: I. II. III. IV. V. VI. VII. VIII. IX. X. XI.

Rule no. 5: Never leave him unattended

“Are you going to stay with us, To–”

“I am not helping you babysit your demon. I already deal with Megumi on my own,” Toji said. You rolled your eyes as you walked into the vast shopping mall. It was the morning time on a Sunday. Not too many people meandering about, but the ones who were looking found the trio (rightfully) strange. Sukuna stood behind you like a guard of sorts, and no matter how many times you told him that you were fine he was insistent on not standing too close.

“The market has changed,” he said gravely.

“It has quite a bit,” you responded. You tugged on his robe, wanting him to follow you into the closest store that you found. Sukuna squinted at the mannequins with no face posing with the latest season trends, tapping his fingernail on the lifeless body.

“Are they cursed?” “They’re not real.”

You carelessly turned your attention away from Sukuna. A new shimmery gold handbag grabbed your attention, and you wheeled it around in your hands trying to find the price tag. The scent of burnt plastic tickled your nose, and you were going to call Sukuna to follow you back when you realized that the smell was coming from him.

The mannequin that once was jumping in joy now bubbled and hissed in a molten puddle on the floor. You had no idea what happened but Sukuna stood over it with his arms tucked in his kimono.

“It was weak.”

“Don’t just stand there, move before an associate comes by,” Toji hissed. He grabbed your arm, pulling you out of your shock and in turn you grabbed Sukuna’s hand.

“I thought you were leaving?” You gasped.

“And leave with that lunatic?” Toji exasperated. “It’s almost time for school to start. I could buy Megumi some new clothes.”

You were going to ask about Megumi when Sukuna caught your attention again. People who worked in kiosks that usually have no shame when it comes to shoving a new product in passerbys, were distancing themselves from Sukuna. The only person brave enough was a jeweler who looked at Sukuna with bright eyes.

“Hey, why don’t you come over here so we can get you dripped out? Let’s see a smile, we can get you some grills.”

“N-no, we’re good,” you answered for him, tugging Sukuna away.

“It’s a shame. We got diamonds as big as he is!”

“Trust me, we don’t need them,” you waved. You were yanked back into place despite your attempt to move forward. Sukuna had stopped walking and was looking at the kiosk intently.

“You used to be adorned in jewels. Emeralds and rubies were your favorite.” He gazed back at you. “Did your preferences change?”

You had no idea why your heart fluttered at his words. Maybe it was the fact that those were still your favorite stones but you only wore them on special occasions. Maybe it was the sincerity in which he asked you. You shook your head, taking his hand in both of yours. “It’s still the same. I just don’t have the money to buy you a cuban, that’s all,” you laughed.

“Money should never be a barrier,” he insisted. He rummaged through his robes in search of something but with no avail. “But then again, if you want something, take it.”

“Slow down, big guy. I don’t need it that bad,” you stopped him. If he did to those workers anything like he did the mannequin you’d have a lot more trouble on your hands. The mailman was an easy mess to sweep away considering that he barely remembered anything, but there were cameras everywhere in the mall.

“Yeah, when you guys are done fucking disgusting in public we can go to another store,” Toji rolled his eyes.

Once again you three trailed into a new story with Sukuna under close surveillance. You were glad Toji decided to stick around so he could help you choose the clothes to put on Sukuna.

Some outfits the demon agreed with and you cheered happily. Others he turned his nose up at and Toji would mutter “what the fuck does he know” under his breath until you pinched him to keep quiet.

When you had a large pile of clothes in your arms, you directed Sukuna to a dressing room to try them on to ensure the sizing was correct. You sat on a couch next to Toji in the waiting area for Sukuna to flaunt his new clothes. You leaned back into the chair, letting out a deep sigh while looking up at the ceiling.

“Oh– how is Gumi by the way?”

“He’s fine,” Toji grunted. “Worried since he can’t take the dogs with him to school and is convinced that I don’t feed them on time, but fine.”

You snorted. That does sound like the Megumi you know. He was the main reason why you ended up with Toji for a short while. He was so quiet yet inquisitive you immediately grew a soft spot for the kid. It just so happened that his very attractive father was into you. It didn’t last, your incompatibilities stacking up faster through the months, but you still cared for the little kid. You fondly smiled at memories with Megumi when Toji pulled you from your thoughts.

“Hey, are you really gonna stay with… him?”

You took a peek at Toji. His arms were crossed over his chest and he had his signature frown on his face, the one he got when he was trying to work out a problem.

“Sukuna?”

“No. The other demon you’re tethered to,” he deadpanned.

“Um… I don’t know. I really don’t know what to do in the long run,” you answered honestly.

“He can’t stay here. In our world, I mean. He has to go back,” Toji concluded.

You weren’t sold on the idea. Toji could feel your hesitance and attempted to talk some sense into you. “He has a natural form that has twice as many arms, eyes, and legs than needed. You didn’t see it, but he burnt that mannequin down with his hand,” he said raising his palm “Oh and let me guess, he probably doesn’t have a normal diet. You cannot expect me to believe that a burger will satiate him.”

Your silence was confirmation enough. Toji sighed and shook his head. “Send him back.”

“I can’t,” you admitted.

“Why not?”

“The book is technically lost,” you mumbled through your hand but Toji has impeccable hearing.

“You lost the book,” he repeated. “You lost the only thing that can send him to whatever hellhole he came from.”

“I didn’t lose it, thank you very much,” you snapped. “There was a mixup at the library and it was gone before Sukuna popped up. You can use his name every once in a while.”

“Do you know how to get it back?” Toji asked, ignoring your suggestion.

“Yeah, it’s supposed to be back at the library soon.” You twisted your hands together, biting your lip. “But Toji, he said that we are soulmates.”

“He’s a demon. They lie,” he said like it was the most obvious thing in the world. Perhaps it was. That would be the most logical thing to consider. “He could be using you to free him and then he can really start destroying shit.”

“You’re not wrong,” you mutter quietly. “I just don't feel that way. I think he’s telling the truth.”

Toji stared at you like you had grown four eyes and horns. “I can’t explain it, okay? If he really wanted to hurt me, he could’ve easily done so and found someone who’s much more willing. Even though he can’t stand you, he seems to be getting along with you for my sake. You can’t tell me that’s normal for demons, whatever that is.”

Toji returned to his usual thinking frown. You patted your knees and stood up abruptly.

“He’s been in there a long time, don’t you think? I wonder if he needs help,” you say, already drifting to his stall. Toji didn’t stop you from walking down the hall and you rapped the stall door.

“Sukuna? Are you okay in there?”

“It’s all children's clothing,” said his voice from within.

The door clicked open, a sliver of the inside appearing to you and you pushed it forward.

Inside you found Sukuna in a tangled mess of clothes. One t-shirt was far too small despite being the largest size you could find and his pants bulged uncomfortably from his thick muscles. The expression on his face was utterly annoyed. You stifled a laugh, not wanting to offend him.

“Okay, let’s try something else,” you offered. After struggling to remove the shirt for five minutes you managed to remove it from his body without tearing it, a feat you mentally patted yourself on the back for.

“I think we should stick with shirts with buttons,” you said, grabbing one of the white button down short sleeves. “But it just makes it a little harder since you have long nails.”

“Put it on for me,” he ordered.

You raised a brow. “‘Please’ would be nice to hear.”

“You expect me to beg?”

“Not beg. It’s called manners. I won’t do anything unless you ask nicely.”

An annoyed puff of air pushed through Sukuna’s nose. ‘Please’ was a desperate word. Sukuna was not desperate for anything. However, you were not changing your stance. You stared at him expectantly and another huff left him. Only you could bring him to his knees.

“You’re as stubborn as ever. Please put it on,” he said through clenched teeth.

You beamed, a reward that made the unbecoming plea worth it. “Of course I will.”

You filled the air with bubbly conversation. “I think these shirts suit you the most. I could buy it in a couple of different colors so you have something that matches the time when we go out. I know another place we can stop by and maybe they’ll have t-shirts in your size so that you can put on your clothes without assistance. What do you think?”

You faced the mirror to admire Sukuna. You wanted to step out of his way so that he could take in the shirt properly, but his hand slipped perfectly into the curve of your waist. He tilted his head, giving the shirt a quick glance before capturing your image. He leaned down and whispered in your ear.

“I believe you have great taste. I am forever in your care.”

Your heart pounded in your chest. Demons are meant to be smooth talkers, you reminded yourself. And this one wanted to talk you out of your clothes.