A Hufflepuff's Heart - Regulus Black
₊‧⁺˖⋆ Masterlist ⋆˖⁺‧₊
Summary: Regulus Black’s unexpected friendship with a sweet Hufflepuff is revealed when Sirius catches them together.
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The air in the castle was brisk, the cool draft weaving through the stone corridors and carrying with it the faint scent of autumn leaves and freshly lit torches. Regulus pulled his cloak a little tighter around his shoulders, his mind preoccupied with the latest round of pranks that had once again targeted Slytherin House. It wasn’t hard to guess who was responsible—his brother Sirius’s handiwork was as familiar as it was aggravating. Regulus could almost predict the moment Sirius would appear, armed with a smirk and a taunt, ready to test his patience yet again.
Sure enough, as Regulus turned the corner, Sirius was waiting there, arms crossed, looking entirely too pleased with himself.
“Ah, Regulus,” Sirius drawled, that irritatingly self-satisfied smile tugging at his lips. “How’s my favorite Slytherin?”
Regulus forced himself to remain calm, carefully keeping his expression neutral, planning to just walk right past his brother.
Sirius’s grin widened, undeterred. “I take it you noticed the common room… enhancement? Thought the emerald and silver scheme could use a bit of sparkle.”
Regulus rolled his eyes, the irritation flaring up despite his attempts to stay indifferent. “If you’re going to make yourself a nuisance, at least have the decency to make it subtle.”
“Oh, subtlety is no fun, Reg,” Sirius replied easily, leaning back against the wall, his eyes glinting with mischief. “Besides, it’s not as if you’re incapable of a bit of rule-breaking yourself. Don’t think I don’t know about those after-hours trips to the library—”
“Sirius,” Regulus interrupted sharply, his voice low but firm. “I’m not interested in discussing my nightly habits with you.”
Before Sirius could fire back, the sound of footsteps echoed down the corridor, followed by a familiar, bright voice that cut through the tension like sunlight breaking through clouds.
“Reggy!”
Both brothers turned to see you striding towards them, your Hufflepuff robes swishing as you approached, your face lighting up with a smile that was warm enough to melt even the most stubborn winter chill. Regulus’s expression softened instantly, his usual guarded look replaced by something more open, more vulnerable.
Without a second thought, you walked right up to Regulus and wrapped your arms around his neck, pulling him into a hug. He stiffened for a heartbeat, caught off guard by your sudden affection, but quickly melted into the embrace, his arms coming up to hold you close.
“Hey,” you said softly, pulling back just enough to look at him, your eyes filled with warmth and a hint of concern. “How have you been?”
“I’m… good,” Regulus replied, his voice softer than usual, almost as if he were afraid of breaking the spell your presence cast. A small, genuine smile tugged at his lips, a rare sight that seemed reserved only for you.
As you finally pulled back, still standing close to him, you seemed to notice Sirius for the first time, your gaze shifting over to the older Black brother with a look of surprise. A polite, curious smile flickered across your face as you gave him a small wave.
“Oh, hi! I didn’t realize there was anyone else here. I’m Y/N,” you said, introducing yourself in that sweet, open way that Regulus had come to adore.
Sirius raised his eyebrows, looking you up and down as if trying to solve a riddle. He offered a nod, his grin softening into something more curious, though he said nothing in reply. For once, Sirius Black seemed to be at a loss for words. There was something he couldn’t quite place about you—a gentleness, a warmth—that seemed so at odds with the icy walls Regulus usually built around himself. It was strange, almost impossible to imagine someone so kind being so close to his guarded, distant brother.
After a moment, Sirius managed a slight smile, finally extending his hand to you. "Sirius Black,” he introduced himself, his tone curious, though he kept his usual charm restrained. “Regulus’s… older brother.”
You took his hand, returning his smile with a polite one of your own. “Oh! It’s nice to meet you,” you replied, a hint of surprise in your voice. You turned back to Regulus, seemingly oblivious to Sirius’s scrutiny. “I had no idea you had a brother, Reggy!” you said with a laugh, your eyes shining with amusement. “You keep him quite the secret.”
Regulus shifted, his hand instinctively tightening around your shoulder. He’d dreaded this moment for so long, the day you would meet Sirius, the brother who seemed to draw people in without effort, who everyone adored and admired. Regulus had always felt invisible in his shadow, the “other” Black brother, colder and quieter, always on the outside looking in. But you had seen him—you had seen past the walls, the carefully constructed mask, and found something worth holding onto. And he couldn’t bear the thought of sharing that with Sirius, of watching you get pulled into his brother’s orbit and realizing he could never be what Sirius was.
Sirius, still watching silently, caught the faint, possessive gesture, the way Regulus seemed to pull you closer as if trying to keep you all to himself. His expression flickered with something unreadable, a mixture of curiosity and something softer, something he hadn’t expected to feel. Seeing Regulus with you—seeing his younger brother so fiercely protective of this rare connection—stirred something in him, a strange pang of almost… respect.
The silence stretched, and you shifted slightly, glancing between the two brothers as if sensing the tension, though you didn’t seem to mind. Instead, you gave Sirius a warm, friendly smile before turning back to Regulus, your hand reaching for his as you gave it a gentle squeeze.
“Well, Reggy and I should get going,” you said softly, looking up at him. “We’ve got some homework to catch up on.”
Regulus’s gaze softened at the touch, and he nodded, his lips curving into that faint, private smile that he reserved only for you. “Yes, we should.”
With a final nod toward Sirius, Regulus gently guided you down the hallway, his arm draped protectively over your shoulders. He glanced back once, catching Sirius’s gaze, and for a fleeting moment, the brothers shared a look of understanding—a silent acknowledgment, a truce of sorts. Sirius watched as you walked away together, his brow furrowed in thought, his mind turning over the strange puzzle of his brother and his unlikely friend.
How did someone as kind, as open-hearted as you manage to find your way into the life of someone as complex and withdrawn as Regulus? Sirius couldn’t understand it, couldn’t fathom what had drawn you to his quiet, brooding brother. But as he watched the two of you disappear down the corridor, he felt a spark of hope, a rare flicker of warmth in the cold, stone-cast walls of the castle.
Maybe Regulus had found something Sirius had never truly understood—a genuine connection that didn’t rely on charm or bravado, but on something softer, something real.
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