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lauryri · 6 months

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Brother’s Best Friend

Sirius Black x reader

In which Sirius Black finds comfort in the person he least expects.

The same day that Sirius Black realized his parents were Slytherins was the same day that Sirius had sworn off all Slytherins forever. It started off as a childish thing, a one-sided, unspoken attempt to get back at his parents for all of their strict rules and exaggerated lectures about the importance of his pure-blood ancestry.

When he met James Potter on his first train ride to Hogwarts, the resentment towards Slytherins grew into a shared inside joke. Something that the two of them could continuously throw around. Never mind that James Potter was from a pure-blood family as well. The joke was just another feeble attempt to get back at his parents.

And then, he met Severus Snape. And then, he met the insults and snide remarks of his Slytherin classmates. And then, he had finally decided: there was no good that came out of Slytherin.

So it’s no surprise that when his little brother, Regulus, was sorted into Slytherin a year later, Sirius was devastated. Sirius was silent during the entirety of dinner and even remained silent as he arrived in his dorm. The other boys tried not to disturb him, but they had never seen him so quiet before, and it was starting to disturb them.

“Some evening,” Peter said awkwardly, a yawn emerging from him. Remus gave him a strict look before turning his attention back to Sirius, worry evident on his face.

The silence only seemed to grow thicker until finally Sirius sighed and his words rushed out, eager for release.

“I thought he was different. This whole time I thought he wasn’t like them,” Sirius began.

“I mean yeah, Slytherins can be awful, but he’s your brother,” James replied, attempting to soothe his best friend.

“Very insightful, James,” Remus said sarcastically from his side of the dorm. He leaned back against his bed frame. “But I agree. He’s your brother. You know him.”

“I don’t think I do anymore,” he replied solemnly, his eyes sullen yet harsh.

“Don’t be like that, Sirius,” said Remus, “just talk to him.”

Sirius doesn’t talk to him the next day. Or the rest of the year for that matter. He says what he has to during the summer but when school starts, he goes back to ignoring him.

It’s not easy to pretend that Regulus doesn’t exist. He started to play quidditch. He is one of the smartest in his year. And he’s always seen with a Slytherin girl that is in Sirius’ potions class. She’s reserved and intelligent. She seems polite enough. She talks with Lily Evans. She’s even pretty. But she’s also a Slytherin and Sirius believes that’s a good enough reason not to trust her.

She’s always with Regulus. They sit together in the Great Hall. They walk in the corridors together. Sirius spots her one day leaning against Regulus’ shoulder, laughing loudly at something he said. Sirius resents her for it. He hates her for knowing Regulus.

Later that day, Sirius is walking into Potions class when he spots her talking with Lily Evans. He tries to walk past unbothered, but then he hears her mention Regulus’ name.

“Regulus and I have a bet,” she says with a laugh. Sirius tries to ignore how sweet her laugh sounds.

“Is that right?” Lily chuckles and shakes her head.

“He’s the best seeker that’s ever been. Write it down. This Saturday. You’ll see.”

“He really doesn’t think he’ll catch the snitch?” Lily wonders curiously.

The girl responds back with a small pout. “He doubts himself a lot. I hate it. But I’ll win the bet, and he’ll see.”

Sirius rolls his eyes and continues walking. What does she know? Regulus is his brother after all.

Their conversation leaves him with an irritation that follows him the rest of the day and a worry that maybe he doesn’t know his brother anymore. James has tried cheering him up, but Sirius continues his sulking all day. He hardly eats anything when they sit down in the Great Hall. He goes to bed as soon as they make their way to the dorms. No one bothers him.

The next morning, the marauders don’t even have to ask Sirius what’s wrong. He wakes up determined and explains the whole situation to them.

“He doubts himself sometimes. I hate it,” Sirius says, mocking the girl as his story comes to an end. He shakes his head furiously.

“Are you talking about y/n?” asks Remus.

“Y/n? I don’t even know who that is. Did you hear anything that I even said?” Sirius looks as if Remus has just deeply betrayed him.

“The girl you keep complaining about. She’s Lily’s partner in potions,” says Remus as if this is common knowledge.

“A friend of Lily’s is a friend of mine,” says James, a teasing smile on his face.

Sirius thinks that maybe, given a different circumstance, he might have laughed. But James is supposed to always be on his side, so he makes a face of disgust instead. “You too? Peter?”

“She’s quite pretty,” He responds with a shrug of his shoulders.

“She’s a Slytherin,” Sirius mutters, but it’s loud enough for the rest of them to catch it.

“Really?” Remus rolls his eyes, “I thought we were past all of the house prejudice or whatever you’d like to call it.”

“That’s not why I don’t like her,” Sirius lies, quickly defending himself. He pauses as he struggles to come up with another valid reason. He continues on anyway, “she’s very… assuming. How can she possibly know how Regulus feels? I’m his brother. If anyone knows him it’s me.”

The three of the boys share a knowing look.

“Sirius,” Peter speaks up hesitantly “when’s the last time you even spoke to Regulus?”

Sirius isn’t sure why that question hits him as hard as it does, but it hurts. Surely it wasn’t that long ago. They spoke a little during last summer whenever he wasn’t at James’ house…

Sirius decides that he doesn’t owe any of them an explanation. He stands up quickly and mutters a faint, “excuse me.”

Sirius’ urge to run away leads him to the front of Hogwarts’ entrance. He finds it ironic that the first thing he notices as he exits Hogwarts’ front doors is the Slytherin girl, or Y/n as she sits alone near the Great Lake.

Sirius had no time to think about the reckless act he was about to make. He was fueled by the anger of Peter’s question and the fact that he really didn’t know when the last time he had spoken to his brother was. He figured the only obvious option was to blame her. The girl with soft eyes and a determined expression. The girl sitting with her back against the tree, seeming not to notice the ruckus of the other students around her, not even noticing Sirius’ haste steps towards her as she stares into her book.

“Y/n, is it?” he says finally as he comes to an abrupt stop in front of her. In a quick second, her eyebrows furrow and her gaze is on him. Her eyes even widen a little bit.

She takes a few seconds to respond, and in all of those few seconds, Sirius can feel himself growing impatient. Before she can even finish saying yes, Sirius cuts her off.

“It’s a bit cold out here to be reading don’t you think?” his tone is harsh.

“What?” she replies confused, and Sirius almost feels bad. Almost.

“It’s just that it’s cold, and you’re not even wearing a jacket and…” Sirius’ voice begins to falter. His pride doesn’t let him stop. “I’m Regulus’ brother.”

She nods. “I know that,” she says sharply.

Sirius is immediately taken aback.

“Fine. Who are you anyway, his girlfriend or something?” he replies back with the same sharpness in his tone.

She laughs loudly enough to surprise him. He looks at her in confusion, and she shakes her head. “Who are you to ask something like that? You won’t even look at him.”

Sirius tries not to let that hurt him, but it does. “I’m his brother.” He keeps saying this. He’s hoping that after saying it enough times this simple fact will make up for everything else.

“No. I’m not his girlfriend,” she replies.

“You just seem to always be with him,” Sirius presses on, and he knows he shouldn’t, but some pathetic part of him feels like by talking to her, he’s kind of talking to Regulus.

“He’s my best friend.” With those simple words, Sirius has the daunting feeling that he has completely lost his brother. He doesn’t say anything for a few seconds, and Y/n just stares up at him curiously.

“Why are you speaking to me, Sirius?” she asks after moments of silence.

“I don’t know,” he admits because isn’t it just the truth? He doesn’t know.

Y/n continues to stare at him, and it kind of annoys Sirius until she finally says, in a calm voice, “Talk to him before the match tomorrow.”

Sirius doesn’t really understand, but before he can ask, she’s adding on.

“ ‘Good luck’ or ‘you’re going down’ I don’t care what it is. Talk to him.” And with that, she goes back to her book.

Sirius is going to talk to him. The game is about to start, and Regulus is right there. He’s going to talk to him any minute now…

Regulus is already focused on the game. Most people have a hard time understanding Regulus, but to Sirius it comes naturally. He can see the way worry flickers across his face before immediately being pushed away. He feels the urge to reach out, to comfort him. And now he understands why Y/n had asked him to say something; he understands her conversation with Lily.

The whistle blows and Regulus is about to fly when Sirius blurts it out.

“Good luck,” he says to Regulus. Regulus is undoubtedly surprised. His eyebrows raise, and he’s quiet for a few seconds.

Then, he simply nods, “Sure, you too.”

Regulus doesn’t sound bitter. The interaction between them almost feels natural. Sirius smiles lightly. Although, it doesn’t take long for the brief happiness to subside into a feeling of guilt. He spent so much time resenting his brother for something outside of his control. He has a sinking feeling that he was wrong.

He tries to find Y/n in the stands, and when he does he breathes in sharply at the sight. She is smiling so brightly that he finds it difficult to look away. He hates to admit it, but he thinks he might have been wrong about her too.

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