As time passed, Sirius and Severus worked together—more closely than either had ever expected. Trust, once a fragile necessity, grew into something unspoken yet undeniable. Their alliance, forged in circumstance, became a bond neither had anticipated.
Severus had lived in isolation during his final year as headmaster of Hogwarts—alone, cut off, trapped in a world where every glance carried suspicion. Allies mistrusted him, colleagues remained distant, and enemies watched his every move. Hogwarts had become his prison, his grief a weight no one else could comprehend.
Then came the second chance—and with it, Sirius Black, the ever unpredictable force.
Sirius, with his effortless charm and fierce loyalty. Sirius, who could be both maddeningly reckless and unexpectedly perceptive. He had a way of making Severus feel—seen. For the first time in so long, Severus wasn't alone in his grief. Sirius was there, offering a warmth Severus hadn't realized he craved until it was there, undeniable. The understanding, the silent companionship, the shared moments where words were unnecessary—Sirius had become a lifeline.
It was that warmth, that unwavering presence, that slowly chipped away at the walls Severus had spent years fortifying. He was like a traveler dying of thirst, unaware of his own need until he stumbled upon an oasis—unexpected, impossible, yet vital.
Severus had always prided himself on his ability to keep his emotions in check. It was a necessity, a skill honed over years of betrayal and danger. But somewhere along the way, as he worked side by side with Sirius, something shifted.
It wasn't sudden. It was gradual, like the slow warming of a cold stone in the sun. Sirius Black—the impulsive, reckless man Severus had once considered nothing but an enemy—had become something more. A friend.
Sirius had a way of drawing people in, his easy confidence and charm effortless. He flirted without thinking, his presence magnetic. But Severus saw beyond the bravado, beyond the smirk. He saw Sirius in a way Sirius himself didn't seem to realize.
And Sirius, somehow, saw him too.
No one else could understand what haunted them both. Halloween, for instance—the shared weight of that day. No one else knew why it left them raw, why the grief lingered long after the world had moved on.
Then came the realization, creeping in like the tide—this connection between them had shifted. Sirius, with his careless smiles and quiet kindness, was no longer just a rival. He was a friend. And perhaps, something more.
Of all the people. Of all the people in the world to fall for, it had to be him—the man so unlike Severus, so free in ways Severus had never allowed himself to be. But as days passed, as their bond deepened, Severus couldn't ignore the truth.
And yet, he hid it.
He was good at that. Good at locking away what he couldn't control, good at burying emotions beneath layers of practiced indifference. It was a skill he had perfected. And besides, it wasn't as if Sirius felt the same.
So he remained silent, watching Sirius with a mix of longing and restraint, letting the moments slip by without daring to speak the words that would change everything.
But denial did nothing to quell the inevitable. Whether he admitted it or not, he had fallen for Sirius Black.
Sirius stood in the corner of the room, watching his friends laugh and joke, their faces glowing with carefree smiles despite the war raging outside. The scene should have been comforting, familiar, but it only served to highlight the distance he felt. They expected him to be the same—the same reckless, carefree Sirius they had known, without the shadows of Azkaban, before everything had changed.
They didn't know the nightmares that plagued him—the flashes of dementors that would claw at his mind in the dead of night. They couldn't know. No one could.
And he had to be strong, had to keep his facade intact for Regulus. His younger brother had already suffered plenty on his own, grappling with his choices and the weight of his family's expectations, walking a knife's edge every time he answered a summon. Sirius couldn't show weakness, not when Regulus was so broken.
But the more he watched Regulus, the more he realized just how much Severus had endured—how much he had contributed to the Order as a spy in his past life. Severus hadn't had anyone to lean on, any siblings to turn to, He had no one to guide him through the darkness, no one to show him how to walk the fine line like he did Regulus. No one respected his work; everyone watched him with suspicion, as though he was just another tool to be discarded when no longer needed. And Sirius knew the sting of that, knew how it felt to be treated like an outsider.
What struck him the most, though, was how much Severus had done for the cause—how much Severus had been through. He wasn't just a spy; he was a man shaped by isolation and suspicion, someone who had to navigate the world alone, without support. And yet, he still chose to come back, determined to change more lives for the better.
And when Severus wasn't throwing insults or delivering those cutting remarks with his dry wit, Sirius realized something else—Severus was funny. Darkly so, but funny. Clever, capable, and more human than anyone had given him credit for. He's more vulnerable than anyone Sirius knew under that cold indifference mask.
Sirius felt his chest tighten. He knew he shouldn't care, that it would lead nowhere. He knew that nothing would come of it. But still, he couldn't help himself. He couldn't help but care for Severus more and more, despite everything. It was something he couldn't shake, this strange pull he felt toward him, this unexpected connection that had started to grow.
It wasn't something he had asked for, something he had expected—but it was there, undeniable and unsettling.
Sirius's frustration had been building for weeks. The weight of his feelings for Severus had become unbearable. He had tried to ignore it, tried to bury it under the guise of moving forward, of being the person his friends expected him to be—the reckless, charming, flirtatious Sirius Black. So, he dated. He flirted with witches and wizards, tried to fill the emptiness with someone, anyone.
None of it worked. No one compared to Severus. And Severus, perhaps sensing the shift, pulled away. Their quiet late-night conversations stopped. The unspoken understanding between them faded into stiff exchanges about the Order, about the mission. Nothing personal. Nothing real.
The silence between them grew heavier, suffocating, and Sirius found himself adrift in a sea of confusion and longing. The more he tried to fill the void with others, the emptier he felt.
Then came the disaster of the evening. Another date, another attempt to forget Severus, and yet, in the middle of the conversation, Sirius found himself comparing the wizard across from him to Severus, again. It was no use. No one else could measure up.
That night, as the weight of his feelings crushed him once more, Sirius found himself standing outside Severus's door, knocking lightly. His heart was pounding, his mind racing.
Severus opened the door, his usual cold indifference written on his face. He wasn't surprised to see him, but he didn't invite him in, either.
"I—" Sirius hesitated, the words sticking in his throat. "I needed to talk."
Severus stood in the doorway, arms crossed, eyes calculating. "About what?" His voice was impassive, guarded.
Sirius stared at him, feeling that familiar pull deep in his chest. He was tired of pretending. Tired of denying what was so obvious to him. In that moment, everything he'd been holding back came rushing out in a wave.
"About how nothing is working," he said, his voice louder now, more desperate. "About how I can't stand these stupid dates anymore, how I keep comparing them to you and how they're nothing like you. About how I'm... falling for you, Severus. I have been for a long time, and I hate that I've had to hide it."
Severus's expression didn't change immediately, but there was a flicker—something—behind his eyes. Sirius couldn't tell if it was disbelief, confusion, or something more, but Severus remained silent for too long.
The tension between them crackled, suffocating the air.
Sirius let out a bitter laugh, stepping back. "It's ridiculous, isn't it? You've probably never thought of me that way. I've always been nothing but a nuisance, haven't I?"
Severus looked at him, his gaze steady but unreadable. His mouth twisted slightly in an expression that Sirius couldn't place.
Severus's gaze didn't waver. His mouth twitched in something almost like a smirk. "I didn't say that. You just never made it easy to feel otherwise."
Sirius's heart beat faster. "But I—" he began, but Severus held up a hand to stop him.
"You've made your choice long ago, Black," Severus said, almost as if to himself, his tone shifting. "And now you must live with it."
But despite his words, despite the indifference in his voice, there was something there—something in Severus's eyes that hinted at vulnerability, at the quiet longing he'd been hiding, too.
Sirius stepped forward, his heart in his throat, and said quietly, "I don't want to live with it anymore. We were given a second chance at everything, why not this too?"
After a long silence, Severus finally spoke, his voice steady but carrying an edge of something deeper—something he'd been fighting to keep hidden.
"Once you make this choice," he said, his gaze unwavering. "There's no turning back. And we will likely ruin each other."
The words landed heavily between them. It was both a warning but also a confession of vulnerability masked by his usual stoicism. Severus's eyes held something unreadable, but his stance—guarded, yet open—spoke volumes. The decision was laid bare, and Sirius felt the weight of it settle in his chest.
Sirius's breath caught for a moment. He wasn't sure if it was fear, desire, or both, but he knew one thing for sure—this was no casual decision. They were standing on the edge of something irreversible.
Sirius's heart raced, and despite the resolve he had tried to maintain, his voice trembled as he asked, "Are you saying you'll consider it?"
The words slipped out before he could stop them, his breath shaky, vulnerable in a way he hadn't allowed himself to be in years. He was standing on the edge, the weight of Severus's words pressing down on him, and yet he couldn't shake the desperate hope that had bloomed inside him.
Severus's gaze softened—ever so slightly—and for the briefest moment, the usual cold indifference flickered. He studied Sirius, as though weighing the consequences of this moment, of everything that had led them to this point.
"You're asking for something far more dangerous than you realize," Severus replied quietly, his voice a mixture of hesitation and something else, something that could almost be mistaken for fear. "Once this path is chosen, there's no walking away."
Sirius stepped closer, his pulse quickening, feeling the distance between them shrink as the air grew thick with unspoken words. "I'm not afraid of that," he said, his voice low, determined despite the uncertainty that gnawed at him. "I just... I need to know, Severus. I need to know if you're willing to walk this with me."
For a long moment, Severus didn't speak. He just stood there, silent, watching Sirius with that unreadable expression. But when he finally spoke, his voice was softer than Sirius had ever heard it. "You've always been reckless, Black. But I—" He paused, as though choosing his words carefully. "I am not a man who is easily loved. And I don't know how to love in return."
Sirius's heart sank, but there was something in Severus's eyes, a flicker of something vulnerable that made him hope.
"Yes," Severus finally said, his voice barely above a whisper, but the weight of it was undeniable. "We can try. But it won't be easy, and it won't be without consequences. And we do it by my rules, or not at all."
Sirius's heart skipped a beat. He stood there for a moment, feeling the air shift between them. His chest tightened, but he couldn't stop the small, relieved exhale that followed Severus's words. He had been prepared for a different response, one that would make him regret opening his heart to this possibility, but instead, Severus had said yes—the answer he had been yearning for without even fully realizing it.
For a brief second, Sirius found himself caught in the gravity of Severus's gaze, as though everything they had endured—every moment of mistrust, every battle between them—had led to this point. The weight of their shared history hung between them, unspoken but understood.
"Your rules?" he asked, a smirk tugging at his lips. "What do you mean by that? Should I be worried?"
Severus gave him a sharp look, the faintest glint of amusement playing on his lips, though it was still masked by that usual cold exterior. "It means I'm not some prize to be won, Black. And I don't share what's mine," he said, his voice lower now, filled with a quiet certainty. "And if you think this is just another one of your impulsive pursuits, then you are sorely mistaken."
Sirius, feeling the tension in his chest ease just slightly, couldn't help but chuckle softly. "I wouldn't dream of it," he said, his smile edged with a mix of relief and something deeper. "So, what happens now?"
Severus's expression softened ever so slightly, his guarded demeanor not fully breaking but shifting just enough to allow something vulnerable to show. "We start fresh, a second chance." he replied, his words deliberate, measured. "No games, no distractions. Just us. Whatever happens next, we figure it out together."
Sirius nodded, the weight of what Severus had said sinking in. He knew this wouldn't be easy—nothing between them ever had been. But for the first time, he felt the kind of certainty he had only ever imagined. A partnership, not a power struggle. Not a game. Not a fleeting moment of passion, but something real.
The war would go on, and the challenges they would face could tear them apart. But as long as they had each other, as long as they chose to be together, there was no fear, no doubt, no darkness that could break them.
And in that moment, with Severus standing there, their eyes locked, Sirius felt the storm inside him finally calm. He reached out, closing the remaining distance between them, and for the first time, there was no hesitation, no second-guessing.
Severus didn't pull away.
Sirius gently cupped his face, his thumb brushing across the sharp line of his jaw, and Severus's eyes fluttered closed at the touch, a slight shudder running through him.
"Together," Sirius whispered, the word a promise.
Severus opened his eyes and looked into Sirius's, his voice soft but unwavering. "Together."
And then, without another word, their lips met, sealing the unspoken vow, a bond forged in the midst of chaos, in the middle of a war that had claimed so much of their lives. In that moment, nothing else mattered. There were only the two of them, standing at the dawn of everything they had fought for, knowing that together, they could face whatever came next.
The battle was far from over, but as long as they remained beside each other, there was hope. And perhaps, that was all they needed.
When the war finally ended, they stood side by side—scarred, worn, but alive. The cost had been heavy, but far fewer lives were lost than in the previous timeline. It was a victory, yes, but it was one marked with quiet, bittersweet relief. The weight of all they had endured hung in the air, unspoken but deeply felt.
Sirius and Severus had survived. They had made it through the war, through the loss, the betrayals, and the endless battles. Now, with the fighting done, there was a strange stillness that settled over them. The world around them began to rebuild, pieces of the shattered order coming back together. But for the first time, Sirius realized that what mattered most was not the war or the battlefields. It was the quiet moments in between—the moments with Severus.
The lingering years had changed them both. They were not the same men they had been in the past, and certainly not the same men they had been before time had bent to their will. There were scars, yes, but there were also softening edges. Time had worn down the sharpness, leaving space for something else to grow.
And in that space, Sirius realized something. Something he had been holding on to without fully understanding it. It had begun as a fragile hope, something tentative in the midst of their shared past, and it had grown into something undeniable.
It was love.
It was the love that had bloomed quietly, without warning, amidst the rubble of a war that had taken everything from them. And now, in the calm after the storm, it was the only thing that seemed to matter. The only thing that had truly lasted.
In the silence that followed, Sirius found comfort in Severus's presence. There were no words left to say, no grand declarations to make. They had already said it all in the small, unspoken moments—when Severus had held him in the dark, when Sirius had cared for him when no one else would. The war had forced them to confront their deepest fears, their darkest parts. But it had also given them something real. Something that could outlast even the darkest of times.
And then, when they were both nearing the end—old, tired, and at peace—they lay side by side once more, the weight of a life well-lived hanging between them. The war was over, but the true battle had always been with themselves, with the choices they had made, the regrets they had carried. Now, all of that was in the past.
Death came for them like an old friend, silent but inevitable. It didn't rush them; it didn't push them. It waited quietly, patiently, as they lay there, together at the end of everything.
Severus's voice, raspy with the wear of age, was the first to break the stillness. "Was any of this real?" he asked, his eyes searching Sirius's face. "What happened between our death and now?"
Sirius smiled faintly, the corners of his lips twitching, though his eyes held something much deeper. "Does it matter?" he asked, his voice soft and teasing, but his hand reaching for Severus's, a connection that had survived everything.
Death stood at the foot of their bed, an ever-present figure in the room. It didn't need to speak, not immediately. But when it did, it was gentle. "Does it matter?" the voice repeated the question. "It's your truth. And now you are ready to move on without regrets."
Sirius let out a slow breath, his fingers barely twitching where they rested near Severus's own. "Maybe we'll know for sure when we get to the afterlife," he murmured, his voice raspier than usual. "When we see which version of our friends and family are waiting for us."
Severus exhaled quietly, his gaze fixed on the ceiling. "Perhaps," he said. "But either way, it hardly matters now."
Sirius turned his head slightly, looking at him with something softer in his eyes. "Yeah," he agreed, a small smile tugging at his lips. "We had a great life together. And we'll have a great afterlife together, too."
For the first time in years, Severus found himself without a single regret. The war was behind them, the choices they made had led them to this moment, and for once, the burden of the past did not weigh him down. He closed his eyes briefly, letting the peace settle over him.
Then Sirius broke the moment with a smirk. "Or maybe my biggest regret now is not befriending you on the Hogwarts Express when we first met."
Severus's eyes snapped open, and he turned to glare at him, horrified. "Absolutely not!" he spat, his voice carrying a rare sharpness even in his final breath. "I am not living it a third time with you."
Sirius chuckled weakly, and despite himself, Severus let out the faintest huff of amusement.
Death, standing quietly at the foot of their bed, watched as they drifted away—together, as they always should have been.
Notes:
Yeah, in this AU, Severus fell first, but I think it was due to the circumstances before and after their returns. Before his death, Severus was completely alone, and even in this new life, he didn't have many friends. Sirius, on the other hand, was stuck at Grimmauld Place but still had Remus and Harry. And in this new life, he got all his friends back. Lucky you, Sirius. :p
I'm not sure if it counts as a traditional happy ending when they both die of old age, leaving a sense of suspense about whether it was all real. But yeah, I think they're happy, and together.