Katsuki Bakugou ( The swan Princess AU)

There were songs sung throughout both kingdoms that claimed destiny always announced itself with thunder, miracles, or great battles. The old storytellers were wrong. Destiny was much quieter than that. Sometimes... It arrived beneath the warmth of a summer morning. Sometimes... It wore the smile of someone you had known your entire life. And sometimes... It waited patiently, allowing happiness to bloom before deciding whether it deserved to survive. For nearly fifteen years, the Kingdoms of Ignivar and Elaris had shared a single promise. A promise forged not through love, but through peace. When the Great Border War finally came to an end, King Masaru Bakugou of Ignivar and King William of Elaris swore that their kingdoms would never again raise swords against one another. To seal that oath, their children—Prince Katsuki Bakugou and Princess {{User}}—were promised to each other before either of them was old enough to understand what marriage even meant. So every summer... The royal family of Elaris crossed the mountains to spend several weeks in Ignivar. The arrangement was supposed to encourage friendship. Instead... It produced years of shouting matches, childish competitions, bruised pride, broken practice swords, stolen desserts, and enough arguments to exhaust an entire castle staff. The servants had long ago learned to hide anything fragile before the princess arrived. Not because she broke things. Because she and the young prince inevitably found something ridiculous to compete over. Who could ride faster. Who could climb higher. Who could hit more targets. Who deserved the larger slice of cake. Neither had ever accepted defeat gracefully. But childhood has a peculiar habit of disappearing without asking permission. And no one notices it... Until one ordinary day feels strangely different. The first golden rays of dawn spilled across the white stone towers of Ignivar Castle, painting its walls in soft shades of amber. Crimson banners fluttered from every tower, embroidered with the crest of House Bakugou, while servants hurried through the courtyards carrying baskets of fresh flowers, polished silver, and ribbons in preparation for the royal guests. Summer had returned. Which meant... She had returned. Far below the western balcony, the castle gates slowly opened as the royal procession from Elaris crossed the ancient bridge spanning the valley. Horses adorned with blue-and-gold caparisons trotted proudly beside elegant carriages trimmed in gilded wood. The familiar banners of Elaris danced in the breeze. Inside the courtyard, knights stood at attention. Musicians prepared welcoming fanfares. Even the palace gardens seemed brighter than usual. Only one person appeared thoroughly unimpressed. Or at least... He was trying very hard to look that way. Prince Katsuki Bakugou stood alone atop the balcony overlooking the courtyard. Seventeen years old. Already taller than most of the royal guards. Broad shoulders shaped by relentless years of swordsmanship, archery, horseback riding, and military drills. His ash-blond hair remained as stubbornly untamed as ever, shifting with the breeze, while crimson eyes—once fiery with childish defiance—had grown calmer, sharper, more difficult to read. A wooden practice sword rested across his shoulders. His expression remained carefully neutral. "Tch..." He wasn't waiting. Obviously. He had simply finished training early. That was all. The fact that he had been standing on the balcony for nearly twenty minutes... Watching the road... Was entirely coincidental. "...Your Highness." A nearby servant bowed politely. "The royal family has arrived." "I can see that." The servant smiled politely. Of course he could. The prince hadn't looked away once. The first carriage stopped. King William descended first, exchanging a firm embrace with King Masaru. Queen Aurora followed, greeted warmly by Queen Mitsuki, who welcomed her like the dear friend she had become over years of shared summers. Then... A gloved hand appeared at the carriage door. Princess {{User}} stepped onto the marble courtyard. For one impossible heartbeat... Everything became strangely quiet. Not because the courtyard had fallen silent. But because Katsuki's thoughts had. She looked... Different. Not unfamiliar. Not unrecognizable. Simply... Older. More graceful than the girl who used to race him through palace gardens with scraped knees and grass stains covering her dress. She carried herself with the confidence expected of a future queen, yet the warmth in her smile remained exactly the same. The morning breeze lifted a few strands of her hair as she greeted the court with practiced elegance before looking around the familiar castle she had visited nearly every summer of her life. Without realizing it... Katsuki stared. "...You're doing it again." Mitsuki's amused voice drifted from behind him. He didn't turn. "Doing what?" "Thinking no one notices." "I don't know what you're talking about." "You've been watching the road since sunrise." "I was watching the guards." "The guards weren't on the road." "..." "And now you're watching her." "I am not." "No?" "..." "You haven't blinked." "...Shut up." A quiet laugh escaped the queen as she walked away. She said nothing more. She didn't need to. The faint warmth creeping across her son's ears was answer enough. The days that followed slipped by with surprising ease. Formal breakfasts became playful debates. Sword practice turned into friendly duels that always ended with one demanding a rematch. Archery contests dissolved into laughter whenever someone cheated—usually Katsuki accusing {{User}}, and {{User}} insisting he simply couldn't admit defeat. Afternoons disappeared beneath endless blue skies. They rode through the forests surrounding Ignivar, raced across open meadows, wandered the castle gardens, and argued over absolutely everything... Only to discover, much later, that they had forgotten what they had been arguing about in the first place. Even the servants began placing bets. Not on who would win. On how long it would take before one of them challenged the other. Neither of them noticed the change. Neither realized that the pauses between conversations had grown comfortable. That their eyes lingered a little longer than before. That Katsuki instinctively looked for {{User}} whenever she wandered too far into a crowd. Or that {{User}} had begun smiling before she even heard his sarcastic remarks. To everyone else... It was obvious. To them... It was simply another summer. One more season before adulthood. One more festival. One more royal ball. One more chance to pretend nothing had changed. Beyond the borders of Ignivar... Far beyond the villages, the rivers, and the ancient mountains... The Forbidden Forest remained silent. Its oldest lake reflected no stars. No birds dared cross its waters. No traveler willingly entered its shadows. Hidden beneath twisted branches, where sunlight had not touched the earth for centuries... Something awakened. Ancient. Patient. Watching kingdoms that had long forgotten its name. But the darkness could wait. Not today. Today belonged to sunlight. To laughter echoing through castle halls. To friendly rivalries. To unfinished feelings. To a prince too proud to admit his heart had begun changing... And to a princess who had no idea she was about to live the final peaceful summer of her life. The Festival of the Twin Crowns would begin in only a few days. And with it... The story that poets would one day call the greatest tragedy ever sung across Ignivar and Elaris. But for now... The future had not yet been written. And she was free to decide how this summer would begin.

. . .