but not everything lasts forever (muitan angst) part one

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(don't come for me guys and this au muichiro and tanjirou knew each other and dated before the original time they met and also the legal age to get married back in the day was age 14 so-)

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Tanjirou’s POV

The excitement buzzing through me felt like lightning, coursing through every nerve, leaving me both exhilarated and terrified. Today was the day. I was going to propose to Muichiro, the love of my life. We'd been together for two beautiful years, filled with late-night talks under the stars, stolen kisses that felt like secrets shared with the moon, and moments of laughter that were so loud and heartfelt they probably startled the local wildlife.

Inosuke, my loud and wildly unpredictable friend, and Kouta, his surprisingly calm partner, were already engaged and had helped me brainstorm the perfect proposal plan. "You gotta do it with boom! and bam!" Inosuke had shouted, almost headbutting me with his enthusiasm. Kouta, always the voice of reason, had pulled him back and suggested, "Maybe keep it simple. Muichiro likes peace, doesn't he?" I nodded. Muichiro's serenity was what drew me to him; he was like the eye of the storm, and I wanted to anchor myself there forever.

Now here we were, sitting on a grassy ledge, the sky painted in hues of pink, orange, and gold as the sun dipped below the horizon. The view was breathtaking, but nothing compared to the boy sitting beside me. Muichiro’s long hair fluttered in the breeze, and he turned his silver eyes toward me, blinking slowly.

“Do you see us together in the future?” I asked, my voice trembling as I tried to keep calm.

He blinked, looking thoughtful, as he always did before answering anything. “Of course, Tanjirou. Why wouldn’t I?” His smile was subtle but radiant, the kind that sent warmth rushing to my chest. He was forgetful, so much so that he’d sometimes wander around looking for his own socks, but he never forgot me. It was that tiny detail that always made my heart clench in the best way.

“It’s just that…” I paused, my hands shaking as I reached into my pocket and knelt down. The sunlight glinted off the ring, making it sparkle like captured stardust. “Will you marry me?”

For a moment, time stopped. His eyes widened, a rare, raw emotion surfacing, and before I could process it, tears were rolling down his cheeks. “Yes, Tanjirou, of course.” The words were barely out of his mouth before I jumped up, pulling him into a crushing hug, tears streaming down both our faces as we laughed and cried all at once. He smelled of mist and rain, and I breathed him in, memorizing everything.

---

Nine Months Later

The day before our wedding, my heart couldn’t contain the joy. Everything had fallen perfectly into place: flowers, friends, and even the grumpy Kanao agreeing to help with last-minute arrangements. Muichiro had been my rock throughout the planning, organizing seating charts while sipping tea with that serene smile that made everything feel right.

He was on a mission, the last one before he’d come home to me as my groom. I stood in the kitchen, humming as I prepared his favorite treat—sweet dumplings. I could already picture his soft hum of approval when he took the first bite.

Then came the frantic tapping at the window. A crow, eyes wild with urgency, crashed into the glass. My heart seized as the bird screamed, “MUICHIRO HAS BEEN KILLED! MUICHIRO HAS BEEN KILLED!”

The world split open. I didn’t hear the plate shatter on the floor or the sound of my own gasp; I only felt the cold, sinking numbness spreading through my chest. My legs buckled, and I hit the floor, the room spinning as the crow’s message echoed in my mind. “No,” I whispered, over and over, willing it to be a mistake, a terrible misunderstanding.

---

They brought his body to the Butterfly Mansion. I forced myself to walk through the doors, clinging to the hope that it was a mistake, that I would find him sitting up, smirking and telling me it was just a joke.

But there he was, lying motionless, a serene smile still on his lips. His hand clutched the ring I’d given him. Even in death, he held onto me. My knees gave way, and sobs wracked my body until I couldn’t breathe.

The next day, our wedding day, became his funeral. My friends sat in stunned silence, eyes red-rimmed, while his fellow Hashira avoided meeting my gaze. I couldn’t look at the open grave. He was supposed to be at my side, not buried beneath earth and stone.

I spotted a figure slipping away from the crowd. The new Pillar, Tsukuyomi, stood by the river, feet dipped into the water. Her striking vitiligo marked her out, a patchwork of light and dark that seemed as fractured as my heart. I joined her, the silence between us heavy.

“I’m sorry for your loss,” she whispered, eyes fixed on the rippling water.

“Thank you,” I replied, my voice breaking.

She turned slightly, guilt clouding her eyes. “I’m sorry I couldn’t save him,” she said, a catch in her voice.

“What do you mean?” My breath caught, a sharp pain in my chest.

“There was a moment,” she admitted, voice shaking. “I hesitated. If I’d been faster, less afraid...”

“It’s not your fault,” I interrupted, my throat tight. “You did what you could.” But even as I spoke, a seed of blame sprouted in the hollow of my grief, wrapping its tendrils around my heart.

“He was a good man,” she said, turning away. “But not everything lasts forever. And sometimes, all it takes is one second...”

She walked away, leaving me staring at the river, her words cutting deeper than the cold water.

---

One Month Later

A month passed, but the raw wound refused to heal. Nezuko tried to comfort me, holding my hand and pressing her warm cheek to mine, but nothing could pierce the fog of despair. Kouta and Inosuke made clumsy attempts at humor, but their laughter felt hollow. Zenitsu cried with me as a form of comfort, but it just made me feel worse inside. Genya stayed away from me he was close with muichiro and being around me was too much of a heartbreak.

Every night, I replayed our moments together, every touch, every word. Why did it have to be him? Why couldn’t we have had our forever?

“WHY!” I screamed at the stars, my voice breaking, my tears mingling with the rain that seemed to mourn with me. I collapsed, the pain suffocating, a constant, aching reminder of what I’d lost.

I clutched the ring he held even in death, my last promise to him. It was never enough. It would never be enough.

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