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saellefanwork · 2 months

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𝓒𝓱𝓸𝓬𝓸𝓵𝓪𝓽𝓮 𝓵𝓲𝓹𝓼

Contains major KNY / Demon Slayer manga ending spoilers.

Modern Era, Reincarnation. Polyamory Kamado Sumihiko x F!Reader x Rengoku Tojuro

The story is in second person. Unamed Reader. Reader's features are not described.

This Demon Slayer fic is rated Teen. There are sexual implications in some dialogs, but that's it. (I know, it's shocking).

As always, Yoshiteru laments about his single status. That's just how you know it was another typical day at school. Usually, he can find comfort in the fact that his classmate and friend, Sumihiko, is sailing in the same boat as him. But today... Sumihiko surprises him with important news.

Author Note: I originally wrote this story as a Modern Era Sequel of my other fic, "Echoes of Loss," but it can be considered a standalone one-shot too.

Rengoku Tojuro is the reincarnation of Kyojuro and the descendant of Senjuro (with an unknown wife).

Kamado Sumihiko is the reincarnation of Tanjiro and, in canon, the descendant of Kanao and Tanjiro. In the context of the "Echoes of Loss", Sumihiko here is supposed to be the descendant of the former Reader and Tanjiro, but as a separate one-shot you can consider he's still Kanao's descendant, it doesn't really matter.

The Reader is the former "Echoes of Loss" Reader's reincarnation, but again it doesn't really matter here. Their family lineage is not specified, so it's up to you.

(Valentine's day is far gone, but I'm a sucker for japanese Valentine's day fluff, hugh.)

The chapter is primarily from Sumihiko's POV

Two centuries after the Taisho Era, in Tokyo.

As the bell rings to signal the end of the school day at Kimetsu High School, students spill out of the main gate, gradually dispersing into the neighborhood. Among them, sixteen-year-old Yoshiteru Agatsuma once again laments his single status and romantic struggles. It is yet another day dawned on his teenage life without him finding a pretty girl willing to give him a chance. His classmates shoot him exasperated glances, worn out from hearing the same complaints every day on their way back home.

With most his peers ignoring him, Yoshiteru seeks solace aloud.

“At least you get it, Sumihiko. We're in the same boat, you and I."

Kamado Sumihiko, the youngest son of the area's renowned bakers, is known for his pure heart and lack of interest in pursuing romantic relationships. This fact is the primary reason behind his celibacy, since many people are actually interested into him (not that Yoshiteru would ever tell him that). The boy turns his burgundy-haired head toward his desperate friend with a sheepish smile. He rubs the back of his neck, a slightly uncomfortable expression etched on his soft features.

"Oh, no, sorry Yoshiteru. In fact, I've been off the market for a few weeks now."

"Wha-… WHAT?!!! WITH WHOM? HOW DARE YOU BREAK OUR SINGLE MEN PARTNERSHIP?! WE'RE FRIENDS, RIGHT?? WHY DIDN'T YOU TELL ME ANYTHING?"

The boy winces at Yoshiteru’s deafening cries. While not wanting to escalate the situation, Sumihiko can't help but direct his wine-colored eyes towards the sky with a slightly exasperated sigh. This dramatic reaction is precisely why hadn't disclosed this information earlier.

"I never signed a single men partnership with you, Yoshiteru…" Sensing a deadly glare from his companion, the young man abandons that approach and chooses to apologize instead. "Okay, okay, I’m sorry. I did want to tell you, but our situation was a bit unusual, so we preferred not to talk about it immediately with others… But see, now that we've decided to make it official, you're the first to know!"

"NAH, I know nothing, man!!! There's missing information!! Who's this desperate chick who fell for you?!"

Not bothered by the rude question, Sumihiko states your name and that of Rengoku Tojuro with a radiant smile.

Yoshiteru momentarily freezes, his overheated brain grinding to a halt as he’s trying to process the news.

"Wait… You just mentioned two names, right? Aren’t they the heads of the archery and kendo club respectively? Which one are you dating?"

"Both!"

…

"BOTH?!!! I know we live in a century of sexual liberation, but don't you think you're pushing the boundaries a bit too far?! Consider those who are still single – what hope do you leave them if you're dating multiple people, , especially popular and unfairly hot onesn huh?! One wasn't enough to satiate your needs, or what?! You- you perverted libertine!"

"W-We haven't done anything like that yet, we're still in high school, Yoshiteru!" Sumihiko corrects on a reproachful tone, his cheeks ablaze.

"Stop playing the prude boy! You've already reached sexual maturity! Our ancestors were already married at that age! Are your hormones not working or what?! More importantly, explain to me how you went from being single to the hero of a harem shonen, huh?!"

With an overwhelmed expression, Sumihiko tries to calm and appease his hysterical friend and plunges back into his memories…

Sumihiko and Tojuro first met when they were toddlers, though they don’t remember much of that time, of course. Their two families are close, both descending from lineages that supposedly fought demons together two hundred years ago. They became friends in elementary school, when the Kamado family opened a bakery in Setagaya, and Sumihiko transferred into Tojuro’s class.

The first days after their initial meeting, Sumihiko found himself dreaming that he was a valiant warrior, battling monstrous foes alongside a Rengoku who bore a striking resemblance to Tojuro. Admittedly, all members of the Rengoku lineage looked like younger or older versions of each other, but the swordman from his dreams and his classmate really gave off the same feeling; their staring habits and constant smiles were identical, and they were both strongwilled and friendly, though maybe a little odd. Immersed in the tales of their families' legendary exploits since his childhood, Sumihiko didn't think much of these dreams, attributing them to his imagination. But they did add to his curiosity and sympathy toward the fiery boy. Their friendship blossomed effortlessly from the moment they engaged in conversation. Despite their contrasting dispositions — Tojuro always overflowed with energy and determination, while the Kamado's youngest leaned towards a more relaxed and laid-back demeanor — they proved early on to be perfectly compatible and complementary, like two sides of the same coin. Their camaraderie only strenghtened over time, and Sumihiko never dreamt of the Taisho era ever again.

In comparison, the young Rengoku and yourself had first crossed paths fairly recently, at Kimetsu’s high school interclub meeting. Despite this, a strong bond quickly formed between you two. Within a few weeks of your initial encounter, Tojuro introduced you to his childhood friend.

Witnessing your first smile directed at him, Sumihiko knew he was a goner. It was love at first sight, he realized instantly.

There was an undeniable familiarity about you, akin to the connection he had experienced when meeting some of his closest friends for the first time, especially Tojuro. It felt as if you had always known each other. Maybe Yoshiteru and his grandmother were onto something, after all; perhaps it meant you had met in a previous life. If that were the case, Sumihiko couldn't help but wonder about the depth of his past self's affection for you and whether he had succeeded in winning your heart.

In a cursed twist of fate, he soon realized he wasn't the only one irresistibly drawn to you. It became evident that his best friend also harbored a crush on you. Tojuro had never looked at another girl the way he looked at you, not to mention how he constantly sought your attention and praise. Gods, Tojuro just loved praise, and and you seemed to have an endless supply of it for him. Granted, you were an amazing person, and anyone would be pleased to earn your admiration. Since Sumihiko didn't want to come between you two, he tried to keep his growing feelings to himself, hoping he could find contentment in your happiness if you ever started dating. But after a year of close-knit friendship between the three of you, he began to feel anxious. Instead of fading over time, his feelings for you only intensified.

As Valentine's Day approached, Sumihiko found himself increasingly restless. He wasn’t certain he could keep it together if he witnessed you giving honmei chocos (conveying romantic feelings) to Tojuro, so he opted to spend minimal time with both of you. Somehow, you managed to corral the two teenagers at the end of class, surprising them with handmade, heart-shaped chocolates.

The boys were flattered, but intrigued by your gesture. These gifts stood out from the typical giri-choco they had seen you give to classmates, and strongly resembled honmei choco. Yet, usually one wouldn't give multiple honmei choco. Perhaps these were fancy giri-choco, because you were close friends? Still, that heart shape was undeniably misleading…

Despite his rattled thoughts, Sumihiko was too shy to voice his questions. On the other hand, Tojuro couldn't contain his curiosity:

"They look delicious, thank you very much!!!" Gosh, he was loud. Not in the same way as Yoshiteru, but still. "But tell us, are these honmei or giri chocos?"

Sumihiko winced at Tojuro's directness, prepared to deflect the question to put you at ease. However, you responded naturally with a charming smile:

"Isn't it obvious? They're honmei."

Even the typically bold and boisterous Tojuro was momentarily at a loss for words, his brain freezing at the significance of such a gesture. However, he quickly recovered, seeking to clarify the situation:

"Should we conclude that you love both of us?"

"Tojuro!" Sumihiko couldn't help but feel a flush of embarrassment as he nudged his friend, reprimanding him for his unrestrained spontaneity.

"Well, yes… Is it bad?" your voice trailed off as you became increasingly uncertain. "I thought long and hard about who I wanted to make honmei chocos for… but since I couldn’t decide, I opted to make some for each of you instead. I'm not expecting anything in return; I simply wanted to express my feelings… But, of course, if it's too awkward, you don't have to accept the chocolates at all… I'm sorry," you said quietly.

Quickly, the two boys reassured you, affirming that your gesture was appreciated, and they graciously accepted your sweets. However, they remained somewhat evasive in response to your confession.

Once you had departed, they found themselves strolling in silence until they reached their customary spot at the nearby park, where they settled onto the swings. This was their ritual whenever they needed to discuss something important, like Sumihiko grandmother's death. There, they broached the topic of the unexpected situation.

"I admit I was surprised, but I'm flattered that she likes us that way!" Tojuro pointed out carelessly, popping one of the chocolates into his mouth. "DELICIOUS!"

"Congratulations, Tojuro," Sumihiko forced himself to say with a sad smile. "You can finally date her…"

"Hmm? Me? But don't you also have feelings for her?" His childhood friend's owlish red and gold eyes bore into him, filled with genuine puzzlement.

Sumihiko's face flushed with embarrassment.Even Tojuro, who usually paid little attention to such matters, had noticed his affection for you? Unable to deceive his friend, the redhead shook his head, "I don't want to come between the two of you. Our friendship means more to me than any high school crush." Though it had transcended mere infatuation at this point, he preferred not to dwell on that. "Besides, you've known her longer than I have."

While Tojuro had always admired Sumihiko's selflessness, he couldn't help but feel unsettled knowing that his friend was willing to sacrifice his own feelings for him. Crossing his arms, he pondered for a moment. "Hmm… we're best buddies, she likes both of us, and we feel the same way. What if we went out together? That could solve the issue!"

"Huh? Are you suggesting that we both date her?" the baker boy asked, his confusion evident.

"Why not? The athlete Uzui has multiple girlfriends. But it would be a shame to date her separately, wouldn't it? I was suggesting that we also go out together, you and me!"

Sumihiko's face turned even redder at the proposal. He could swear steam was blowing out of his ears.

"Huh?! You and me, Tojuro? But… we've been friends for such a long time… I never sensed you had feelings for me, so why…?"

"Hm! I don't feel exactly the same way for you as I do for our dear kyudoka, but it's definitely stronger than anything what I've felt for other people, including my other childhood friends. I think it could very well blossom into love if we gave it a shot!"

"B-but being together involves holding hands… kissing… that kind of stuff," stammered the flushed Sumihiko, not eager to continue his list. "C-could you do that with me?"

In response, after swallowing another chocolate, Tojuro stood up from his swing seat and stepped closer, framing Sumihiko's face with his hands. The redhead froze, his heart pounding wildly. Before he could fully grasp the situation, his friend planted a sweet and innocent kiss on his lips. The gesture left the young Kamado's face burning, and the kendoka straightened up triumphantly, locking eyes with his comrade. Sumihiko nervously moistened his lips, brushing them with his fingertips in disbelief. Tojuro had left a taste of chocolate on them. Your chocolate…

"See! It was pretty natural, right?" exclaimed the fiery boy loudly. "Did you enjoy it too?"

And Sumihiko couldn't deny it…

Encountering you again the next day, they broached the idea of embarking on a relationship together as a trio. Tojuro elaborated on how they arrived at this decision, openly sharing the story of his first kiss with Sumihiko, much to his friend's dismay. He dreaded your potential reaction: what if the idea of two boys exploring such a thing disgust you?

You eemed taken aback by this development, but to their relief, you displayed clear enthusiasm afterward, tinged with a hint of envy:

"Of course, I'd love to go out with both of you! I can't believe you took the initiative without me, even though I was the one confessing…"

They promptly rectified this oversight by each giving you a kiss, first Tojuro, followed by Sumihiko. Their inexperienced smooches were slightly awkward and hasty, resulting in a few accidental tooth clicks due to nervousness. The overall clumsiness of the moment and the unusual situation prompted a burst of laughter from the three of you. As the mirth subsided, you exchanged happy smiles and made a commitment to do your best to navigate this new dynamic together.

"Since then, the three of us have been going out on dates. We gave ourselves a few weeks to test the waters of our new relationship before announcing it to anyone, just to avoid putting pressure on ourselves. While I still spend a lot of time with Tojuro, it's not quite the same as before—we've grown closer. And, of course, I also spend quality time alone with our girlfriend."

"Wow," replies Yoshiteru, still somewhat incredulous but calmer than before. "My brain is struggling to imagine what it will look like when you will take things to the next level."

"Hey! Stop talking about that… It's too early, and it's none of your business!" The young Kamado's face is a deep shade of crimson.

"WHAT DO YOU MEAN, NONE OF MY BUSINESS?! I STILL PLAN TO LOSE MY VIRGINITY BEFORE YOU, THAT WOULD BE THE LEAST AFTER WHAT YOU JUST DID TO OUR FRIENDSHIP! Ah… Here come your lovers!" he gasps.

Indeed, you and Tojuro await Sumihiko in front of the local dojo in the street corner, waving cheerfully from a distance as you approach. Sumihiko offers an apology to his classmate and quickly joins your company. Watching the interaction among the three of you, Yoshiteru can't help but reflect on how he overlooked the obvious signs, he who is usually so perceptive about others' relationships.

Indeed, despite your conscious effort to keep public displays of affection understated, the subtle, intimate gestures you share reveal a different story. Unnecessary touches, discreet hand-holding, whispered secrets, and silly giggles paint a picture of closeness and affection. Yoshiteru is disgusted by the blissful cheesiness your trio radiates, even though a tiny part of himself is genuinely happy for his friend.

Nevertheless, he hopes that his time in the spotlight will arrive soon, and that he will manage to score with a lovely young lady before Sumihiko does with any of you (or both). However, considering the intense and heated gazes exchanged between you and Tojuro over your most innocent partner, it appears unlikely that the desperately single Yoshiteru will see his wish fulfilled on time.

Glad I rewrote this one too, lol.

My mind is brimming with scenarios (some rated T, some waaaay spicier, I have to admit XD) that could follow this one-shot, but I don't think there's much of an audience for a modern-era Polyamory GN or F/M/M Tanjiro/Kyojuro/Reader. So, I'll probably just keep those for myself XD

Let me know if I'm wrong!

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