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He had always thought desire was a simple thing, the sort of thing that belonged to songs sung too loudly in taverns and knowing grins exchanged between knights after tournaments, a thing directed neatly and unquestioningly toward women because that was how the world had arranged itself around him since birth, because princes became kings and kings took queens and no one ever stopped to ask whether the heart had been consulted before the decision was made. For years Arthur never questioned it either, never examined the shape of his own feelings too closely, until Merlin began ruining every certainty he possessed simply by existing in his life with that infuriating combination of loyalty and insolence that made Arthur want to throw things at him almost as often as it made him want Merlin beside him.
At first, it was easy to dismiss the strange pull he felt toward Merlin, because Merlin was always there and because he occupied so much space in Arthur's thoughts that he could blame familiarity for anything. He could tell himself that the knot in his chest whenever Merlin was injured was concern, that the relief flooding through him whenever Merlin appeared unharmed was friendship, that the way his eyes searched every crowded room for Merlin before settling on anyone else was habit. Yet those explanations began to crack around the edges when he noticed how different it felt with everyone else, because Arthur cared for his knights and trusted them with his life, but he had never found himself staring at the curve of their smiles while pretending to listen to a council meeting, nor had he ever felt his pulse stumble because their hand brushed his while passing a goblet.
The realization did not arrive all at once but instead crept toward him like a storm gathering beyond the horizon, visible only when he finally turned and looked directly at it. The moment that shattered the last of his denial was embarrassingly small, because there was no battle and no grand declaration, only Merlin laughing at something Gwaine had said while the late afternoon sun caught in his dark hair. Suddenly Arthur was struck by the absurd thought that Merlin was beautiful—not handsome in the distant and detached way one might acknowledge another man's appearance, but beautiful in a way that made his chest ache. The horror that followed was immediate because once the thought existed, he could not force it back into silence. He could not pretend he had not felt it. He could not convince himself that men were not supposed to look at other men and think of beauty as though it were something sacred.
For weeks afterward he lived inside a war with himself, carrying out his duties while every certainty he had ever possessed seemed to be unravelling thread by thread, because he still desired women and yet that truth no longer felt complete. Every time Merlin stood too close or smiled at him with that maddening softness he reserved for moments when he thought no one was watching, another piece of Arthur's carefully constructed understanding collapsed, leaving him frightened in a way that battles never managed. Swords were simple. Dragons were simple. Enemies were simple. But the possibility that he wanted something he had never allowed himself to imagine felt vast enough to swallow him whole.
The worst part was Merlin himself, because he remained entirely unaware while Arthur became painfully conscious of everything: the warmth of Merlin's shoulder against his during long rides, the way his voice lowered when speaking only to Arthur, how naturally he reached for him whenever danger appeared, as though some part of him assumed they would always find each other no matter the chaos surrounding them. Every small gesture only deepened the misery because Arthur began to want impossible things, things that left him awake at night staring into darkness and wondering whether he was losing his mind, whether he had mistaken devotion for love, whether there was even a difference anymore.
Eventually the strain became unbearable, and like most disasters in Arthur's life it ended with Merlin cornering him and demanding answers he did not wish to give. Merlin knew him too well, and hiding anything from him had always been a hopeless endeavour. When Merlin finally asked why Arthur had been avoiding him, Arthur found himself unable to lie, unable to invent some convenient excuse. Instead the truth escaped in a rush so humiliating that he wanted the ground to open beneath him, his voice shaking as he confessed not only his confusion but the terrible, wonderful certainty at the centre of it—the certainty that somewhere along the way he had fallen hopelessly in love with Merlin.
The silence afterward felt endless, stretching so long that Arthur became convinced he had destroyed everything. He remembered thinking that this was the price of honesty, that he would lose Merlin now, that every laugh and every argument and every shared victory would become something awkward and broken because Arthur had wanted too much. Yet when he finally forced himself to look at him, expecting disgust or pity or at least surprise, what he found instead was an expression so unbearably tender that it nearly stopped his heart.
Then Merlin laughed, not cruelly but with the exhausted affection of a man who had spent years waiting for someone else to catch up. He stepped closer and told Arthur he was an idiot, which was admittedly not the response Arthur had envisioned, before admitting that he had loved Arthur for so long that he could barely remember a version of himself that did not. For one bewildered moment Arthur could only stare because the world had shifted beneath his feet again, except this time it was not collapsing but opening, revealing possibilities where he had only ever seen walls.
When Merlin kissed him, gentle and hesitant as though giving him every chance to change his mind, all the fear that had haunted Arthur for months seemed to loosen its grip at last. Nothing about it felt wrong or strange or unnatural despite everything he had told himself. Standing there with his hands tangled in Merlin's jacket and Merlin's forehead resting against his, Arthur realized that discovering he was not who he thought he was did not mean losing himself. He was still Arthur, still prince, still future king, still every flawed and stubborn thing he had always been. Only now there was one more truth woven through the rest of them, a truth that looked remarkably like Merlin smiling at him as though he were something worth choosing, and for the first time in an extraordinarily long while the future did not frighten him at all.