Best Friend’s Sister | S. Black
Pairing: Sirius Black x Potter!reader
Description: Sirius never meant to fall for his best friend’s sister but he did anyway.
Word count: 5000+
Warnings: fluff, angst.
Sirius never meant to fall for his best friend’s sister but he did anyway.
He remembers it all vividly, the moment he fell in love with her. It started off as a simple love tale - a love sparked by eye contact and ignited with a kiss. He remembered the small shy girl she was when he met her at the King’s Cross Train Station like it was yesterday.
James Potter was excited to start his second year at Hogwarts School of Witchcraft and Wizardry.
He had promised to meet up with his three friends who were already waiting on the train. What had stopped the boy from running on the train already was his little sister next to him.
“Are you excited, sweetheart? Hogwarts is a great school. I am sure you will love it there,” your mother said as she kissed your cheek.
With a wide grin, you nodded to her. James had told you everything there was to know about Hogwarts.
You could hear him call your name from the train.
“I’m coming!” You turned to your parents and quickly kissed both their cheeks before rushing to the train. You barely could believe you were leaving Platform Nine and Three-Quarter for Hogwarts
James offered his hand. “Finally. We still have to find my friends.”
With your trunk behind you, you followed your brother down the many coupes. You had;t met his friends yet but he had told you the stories. Just like he did at Hogwarts he had also told everything he had done with his friends. How they started to prank some of the other students, and the detention they earned from it. He laughed about it and you couldn’t help but even be excited for the trouble that would occur.
“James, slow down.” You hurried after him, dragging your trunk behind you whil James was already several feet in front of you. Again you called his name when he dashed into the next coupe.
With a sigh, you started a little run after him but when you got into the coupe yourself James was out of sight.
“James?” you called out for him.
“He is in there.”
You jumped from the voice next to your ear.
“Sorry, didn’t mean to scare you,” the boy laughed. “But he is in there with my friends. You mean James Potter, right?”
You nodded your head silently, taking in the stranger in front of you. “He is my brother.”
“Oh, you are his famous sister. I’m Sirius, his best friend if it wasn’t clear yet,” he introduced himself and extended his hand to you.
He waited with a smile for you to shake his hand and after a little while you did. His smile didn’t falter when you still stared at him. You had heard about Sirius, James spoke very fondly of him.
“Nice to meet you,” you whispered. You had to crane your head to look at him, not realizing yet how big twelve can be if you are still eleven yourselves.
“Come on in,” Sirius said when he opened the door. James called you the moment he saw you. He introduced you to his other two friends, Remus and Peter. The only time you weren’t talking to his friends you were eating snacks from the cart.
It wouldn’t be a good day if the boys didn’t arrive late. Even in their fifth year they still manage to almost forget about breakfast in the Great Hall. Well, Sirius and James forgot. Remus and Peter were always the ones to remind them.
Today was no different. You could see them hurrying into the Great Hall. James his eyes searching for you from the entrance.
Then Sirius pointed at you, finding you first.
With a little wave, you beckoned them to join you, not that it was ever a question. Even after three years you were still always invited to their group. It didn’t matter what occasion, even if it was at dinner or at studying.
The four boys arrived in their own way. Remus complained about almost missing breakfast, James told you that it wasn’t his fault, Peter greeted you with a hello and a sorry, and Sirius, Sirius threw his arm over your shoulder when he sat next to you.
“Good morning to you.”
“Good morning to you too, Sirius.”
“Please stop,” James groaned and when swatted his friend’s head.
He could only laugh about it, leaving his arm still around you. “We weren’t even doing anything. Really, James, I think you need a new set of glasses.”
You joined Sirius’ laughter, covering your mouth when you saw the glare of your brother, but the little snickers still left you.
James wasn’t laughing, he didn’t find it funny how his friend was always flirting with you, even if Sirius denied it himself.
Then you felt the arm around your shoulder slowly retreat from its position. Sirius gave you a smile but this one wasn’t as bright as his last one. Yours didn’t match either.
“Remus, how can you act like that book is more important than us? We are incredibly fun today and great entertainment for the world. I am shocked you don’t think the same as society does.”
Remus looked up from his book, his brows raised. “Who are you trying to convince here, Sirius?”
Sirius only smiled at him, taking up more of the couch in the common room. He wasn’t going to answer Remus. His point was already made when Peter and James started to talk to Remus waiting for him to put the book down.
Then he saw you walk in and it was the perfect opportunity.
“I’m sure James’ sister agrees with me.”
“Agree with what?” You asked so sweetly when you joined the group of boys.
Remus shook his head when he answered, “Nothing, Sirius thinks he is the center of the world.”
“You agree, don’t you, love?”
You didn’t have to answer, not when your brother hit Sirius with a book. “That’s my sister man.”
It was all so theatrical. How hurt Sirius looked and reached for his heart. How James threatened to hit him again. “Don't hurt him, James.”
He made a sound in protest when he felt you swat at his head. The book had fallen on the ground when he turned to you. “Really? Are we turning on me now?”
Sirius laughed and pulled you on the couch with him. “Of course we are against you. You hurt me.”
Your giggles filled the room when he pulled you in more, finally offering a bit of the couch to someone else other than himself.
“I wanted to sit there,” James whined as he saw his best friend let his sister join him. “And stop flirting with my sister.”
“Whatever you say, Jamsie.”
But Sirius wouldn’t stop, he enjoyed it too much. He wrapped his arms around you and wasn’t letting go any time soon. He made an agreement in his head that when Remus finished his book he would let you go.
There were many people that gave Sirius Black more attention than he needed. Next to his friends that watched him talk to some girls, you also watched him. A little scowl on your face that you tried to hide with a smile as you talked to Remus.
“I just think that with your notes I can be even better at Charms than I already am. Please, Remus.”
he shook his head. “No, you don’t need them and I know how that ends. Your brother always asked the same and he never studied if I gave it to him.”
“I am not my brother,” you quickly shot back.
“I know, but some traits are scarily alike.”
James dropped his homework and shut his books. He also carried a scowl when looking at his friend.
“See, scarily alike. Even when you’re both angry,” Remus said.
“We aren’t” But again the two of you showed different when you said it at the same time.
You folded your arms but the scowl you had carried disappeared slowly because of these amazing friends. They may have been James’ friends but they were also yours.
Then you felt two pairs of arms wove themselves around you and the once bad mood you felt minutes ago had disappeared from you entirely.
“Cheer up, buttercup,” Peter said with a laugh and you couldn’t help but giggle at the nickname he had given you.
You shook your head, laughing and grasping attention from people in the courtyard but you didn’t care. These were your friends that would cheer you up even if they didn’t know the reason. Even if they were James’ friends they showed friendship to you too.
“Thank you, guys,” you said. “But I hate that nickname.”
Peter laughed and let you out of his arms.
Sirius had heard your laugh from across the courtyard, drawing him in every time he even heard a snippet of it. It was his favorite melody that didn’t need to be composed. He saw you joking with your brother, how Peter threw his hands around you.
He balled his fist for just a second. He shouldn’t be jealous, he had no reason to be. You weren’t his and he was here talking to-
He was still talking to someone, a girl he had forgotten about the moment he heard you laugh. Sirius shook his head. “I’m sorry but I have to go.”
Sirius wasn’t sorry at all when he joined his friends. Greeting them one by one, all in the same way. Except for you, you were always the exception for him.
“Hello, love,” he whispered and kissed your cheek.
“Hello, Sirius.”
James Potter almost didn’t want to invite Sirius to join him and his family for the summer holidays. he had seen the way his friend looked at his sister. Even when he told him she wasn’t his to flirt with, Sirius never listened.
But nearing the end of the vacation even he had to give in to the fact that Sirius Black hadn’t flirted with you as much as he did in school.
It was as if the boy knew that this wasn’t the place and time to do so.
That didn’t mean he didn’t give you any attention. The three of you spend much time together, playing Quidditch, annoying either James or Sirius. Playing games with your parents.
“I can’t believe we have to leave again tomorrow,” you said to the sky.
Then a face propped itself above her. “You can sound a little happier.”
Sirius looked down at you, laying on the grass bed in between the flowers.
“I am happy.”
He nodded at you, taking his own place on the grass. The flowers crushed beneath him but he managed to save one for you. He broke off the stem and placed it in your hair.
“I am happy to go back, but I’m also happy here. A simple place, where nobody cares what I do or that I am James’ little sister,” you said and sat up, eyes still on the blue sky above you where clouds formed.
Ever so softly, Sirius placed his finger on your chin and made you watch him. “You are so much more than that. If they don’t see it, they aren’t worthy of your time.”
He traced your lips, right over the cupid's bow, and stopped on your bottom lip. His eyes slowly reached yours, holding your gaze.
You had wanted this for so long. The moment you met him he was everything you looked up to. He was funny and a great friend. He made you laugh and he didn’t mind if you were down. He would lift up your spirits.
This time you didn’t look away, you didn’t want to.
Your eyes fluttered shut when you felt Sirius's hand on the back of your neck. Pulling you in. He didn’t need to do that, you were already pulled in at the attraction for him. Your whole body felt like it was lit on fire by the simplest touch.
How quickly your whole body felt on fire, how quickly it turned cold from fear.
You could hear James' voice from the house calling your name.
He wasn't close and yet it felt as if you doing something wrong. You weren’t doing anything illegal but you knew his distaste for your flirting with Sirius.
It felt like a betrayal, and it was the worst kind. Because you wanted this but the person you loved most didn’t.
“We should go inside,” you whispered.
He didn’t answer you and that might hurt more than the disappointment you felt before. But he did offer his hand to you, and he did pull you up. He made it hurt a little less when he kissed the top of your head like all the pain left in a simple sweet kiss you wished was so much more.
•
All Sirius could think about were you on the grass, that flower in your hair.
He was going to kiss you, he knew that you wanted him too. You would have moved away if you hated his touch.
All he could think about now was you. At dinner he could only stare at you, wondering what your lips felt like. On the couch, he decided to sit far away from you.
Now, looking at the ceiling of the room his mind was only on you.
With a quick glance at James, he knew what he wanted.
Sirius got out of bed as quietly as he could, making sure to miss the creaking floorboards when he went to the room next to his.
He didn’t even dare to knock, scared to wake you if you were already asleep.
Then the door opened and he had to swallow his scream.
“What are you doing?” You whispered to him.
“I came to see if you were already asleep.”
“I’m not.”
Sirius nodded, licking his lips as he told himself not to stare. “I can see.”
He caught himself staring at your lips again and this time he didn’t stop himself. He took a step forward and brushed your hair behind your ear.
“James snores,” Sirius whispered.
You giggled softly, “He does not.”
“But that is what I’ll tell him in the morning, love” Sirius smirked at you, his eyes never drifting away from you.
He slowly leaned in. Taking one more glance in your eyes to see if you wanted this. To see if you didn’t change your mind but you hadn’t. He could see it.
He could even hear it when you held your breath.
Then his lips touched yours in a soft manner.
First softly, cherishing your lips. Then the kiss turned hungry as if this was the last kiss you’d share. Maybe it felt a little like that on the last day before going back to Hogwarts.
He kissed you until the breath had left his lungs. “I’ve been wanting to do that for a long time.”
Your giggles were like a melody he played on repeat in his head. The one he’s play when you wouldn’t be near him and he needed a reminder of you.
“Me too. Ever since I met you.”
He led you to guide him into your room, he let you kiss him again. He would let you do anything to him if you wanted to. But this night wasn’t about more it was about everything you both had wanted all this time.
So he kissed you again and he would kiss you when you woke up. He would kiss you till his lungs stopped.
He pulled you next to him on the bed, holding you tightly to his chest.
He wasn’t planning on staying the eternity of the night but feeling his muscles relax with you in his arms meant for him that he probably would.
He kissed the top of your head before he too drifted off to sleep.
Sirius had to constantly warn himself not to touch you. Just as close as you were to him, so were his friends.
Even if you all were seated in the Great Hall Sirius made sure to keep his distance.
From the corner of his eye, he watched intently how you spoke to Remus. How EXTRA you talked to him. Your hands moved from right to left when you explained some of the games you had played. How you talked about how lovely the grass lay.
That made him smile a little. He remembered that as well. It wasn’t that long ago, two days only and he wanted to go back to that moment.
Peter hit Sirius on his arm, grasping his attention. “What are you smiling about?”
“Nothing, just a memory,” he answer but the smile never left.
He expected you to jump up when he laid his hand on your leg but you didn’t. You took his hand in yours. Your fingers intertwined together, that’s how you stayed there until everyone would leave. You slowly let go of his hand, fingers touching till the last moment.
Sirius held your gaze until he had to turn around to walk away.
You waited a moment, still talking to Remus before you too excused yourself from the table. It was a poor excuse but for now, it was perfect because it would get you away without much thought.
He was already so far away, probably thinking you wouldn’t follow him.
James wasn’t by his side anymore, he had probably already left him to go to the Quidditch field for practice. It would be perfect to surprise him now, but you weren’t sure if he wanted that.
Still, you did it.
You hurried after him, making sure he barely heard you when you placed your hands over his eyes.
“James, you know I don’t like being the one that is blindfolded,” he said to the hands, taking hold of them and stroking the skin.
He loved when he heard your laugh come from the person. He knew it was you, he had hoped it was you.
Sirius grabbed your arms and pulled himself forward with you, hoisting you on his back and taking you with him. He laughed when you cried out his name.
“Put me down.”
“Nope, princesses get carried to wherever they want to go.”
You dropped your head on his shoulder. “I’m no princess.”
“You’re right, but you are mine, love.”
The moment James came through the picture frame he saw Remus and Peter sitting on the couches.
“Don’t bother,” Peter said as he dropped his papers. “There is a tie on the door.”
“I don’t have time for a stupid tie. I need some help from you guys.”
Both boys looked at him, dropping whatever they were doing.
“I know my sister is seeing someone. She is gone most of the time, hurrying away from me. I need to know who it is.”
“why?” Remus asked. “She is sixteen, James. She is going to date at sometime. Rather now while you’re still here, right?”
“No,” James answered immediately. He ran his hand through his hair. “I don’t want to picture my little sister with some bloke. What if he is a Slytherin.”
Both boys couldn’t help but laugh at him. They too had suspected you were dating someone, at this point many people suspected it. There were some names going around but nothing to really tie back to you.
“I need Sirius for this. He always knows what is going on.”
Peter looked at Remus worried. “He is in his room with a girl. I wouldn’t disturb him if I were you.”
“And even if he did stop, which I wouldn’t bet on. He might not even know.”
What Remus said went to nobody’s ears. James still walked the room, frustrated by the resistance of his friends.
“If anyone knows it’s him,” James said and went to the room. The red and gold tie hung from the door knob.
It mocked him, laughed in his face telling him not to enter. James wanted to but it was a rule they had set up. When the tie was on the door, no one may enter.
In frustration he ripped the tie of the knob before going back to his friends. “Let’s go to class.”
Everyone had noticed how Sirius Black got into class without a tie on.
Normally he would get a lot of questions from his friends about his escapades in their room but this time, everybody took the high road and left him to his own business.
It was almost normal to him if it wasn’t for James’ silent treatment.
“What happened to him?” he asked Remus, the one friend that somehow always knew the answer.
“He knows his sister is shagging someone and he is grumpy about it.”
Sirius only dared to hum.
“You wouldn’t know anything about that, do you Sirius?” Peter asked as he dropped next to him.
“No,” Sirius whispered. “No, I don’t.”
That was the biggest lie Sirius had told them, because he always knew everything about you.
•
“I got a present for you,” you said when you took Sirius’ hand.
“For me? You are to kind.”
With a giggle you took of the tie. “Shut up.”
He let you tie it around his neck. he just stood there, watching his view when you looked so concentrated on tying it for him.
You only watched your own hands move with the tie but Sirius only watched you, your eyes so closely watching him. He was always easily enchanted by you. Every little thing you did was like magic.
“You don’t have to stare.”
“I’m admiring.” He didn’t doubt his answer for a second. It was the truth he would never hide.
You wove your fingers through his hair and stood on the tips of your toes. Kissing him always felt like butterflies. A constant flutter that wouldn’t leave until he was out of sight and even then some lingered.
Your mind was captivated by him. Everything around you had moved itself to the background when you kissed him, the little groans that he made when he pulled you further against him.
Even when the kiss ended your eyes never strayed from his, and Sirius could only watch you. But it was Remus that watched you both.
Remus normally enjoyed the parties he attended with his friends. He might have to watch them sometimes but he always enjoyed them. Except for this one.
He wasn’t planning on having to keep secrets but now, after he witnessed Sirius and you, he had no choice.
It did give him time to think. Everything Sirius did made more sense. How he would constantly gravitate to you. It was as if you were the sun and Sirius was blinded by its beauty and never wanted to see anything different. Every planet always turned around the sun and Sirius always turned around you, a constant pull he never seemed to mind.
Everything made sense now.
Sirius twirled you around, danced with you. he got you drinks and made sure that everybody that ever bothered you stayed away from you. He would always pull you closer if someone squeezed past so you wouldn’t fall.
He would be the one to join you on the couch first when your feet are hurting. He would be the one that would talk to you when you don’t know what to talk about anymore.
He was always there, and it took Remus to see you two to realise you were always there for him too.
You always made sure to check on him first if he wasn’r as talkative. You would search for him when he was missing. You would tell the boys off if he didn’t share their thoughts.
You would make sure he always got his breakfast if he was running late. There would be a new lie leaving your lips why he is missing. You always laughed more when he was around.
Remus couldn’t stand on the side any longer.
Sirius felt a tap on his shoulder dragging him away from you.
“I need to talk to you,” Remus said over the loud music. Sirius nodded and followed him to the stairs.
“What’s wrong?”
Remus checked the stairway before turning bsck to his friend. “You can’t keep this up forever.”
Sirius’ eyebrows shot up.
“What are you talking about?”
“I’m talking about you and James sister,” Remus said hashly. “I can’t keep your secret forever.”
He saw his friend turn white by the realisation of everything. He saw hw he searched for words. “Look, I know how it looks but-”
“I know. I saw. You care for her but you can’t lie to all of us about it. What if James found out and you didn’t tell him? You have to tell him you’re the one that is with his sister.”
“You’re the bloke fucking my sister?” James shouted when he pushed Sirius against the wall.
“It’s not like that at all,” Sirius said when he pushed him off
Remus carefully spoke his names. His hand already on his shoulder but James only shook it off.
“So you’re not fucking my little sister? My sister, Sirius, really? You couldn’t find some other girl to share a bed with.”
Sirius pushed James. “Stop talking about her like that!”
“Why? It’s what you’re doing isn’t it?”
Remus couldn’t mean anything to them. This was their fight, he knew that, he just wished it was one later. When it wouldn’t come to light like this, but secrets always found their way to the light when one least wants it.
“I am not just fucking her, james. I am in love with her!” Sirius shouted back, his hair falling in front of his face when he again pushed James off. “I have been in love with her since second year!”
James stood back when he yelled at him. The words hitting him. It was ammunition James never expected he would feel.
“I love her and if you can’t accept that than that is your problem. But I know I want her, and I am not giving her up. Not today, not tomorrow. Never, James.”
It should have soothed him, to hear his friend truly loved you but there was still knaging feeling left inside him. It didn’t stop. It was the constant reminder that he didn’t tell him, that you didn’t tell him and now even Remus didn’t tell him.
He had to overhear it.
The didn’t even stop when james hit him, or when remues shouted for him to knock it off. It only stopped when you screamed James’ name.
“What are you doing?”
There was no time like today that James heard you this mad before. It startled him for a moment until he saw how you checked on Sirius and not him. “I can’t believe you started dating my best friend.”
“That is what this is about?” you sounded confused. Something he hadn’t expected. “I can’t believe you. You hit him because he is dating me? What is wrong with you?”
He didn’t answer you. All he did was walk away. He had started a fight he didn’t want to finish tonight.
“Don’t you dare walk away from me!”
Not even the voice of Sirius calmed you any longer.
“Out of all the people in Hogwarts you choose him?”
“Out of all the people in Hogwarts, you don’t want me to date your best friend?”
James was starteed by your question. It was the last thing he expected you to ask him. he expected you to scream, to tell him he was childish even. he had anticipated many reactions but to counter his question was not one he expected.
“You don’t want me to date the one person that always looked out for me without you having to ask? The one person you knwo you can trust to treat me fairly, because he does. he treats me much better than I cuold ever deserve and he loves me. he loves me as much as I love him.”
He didn’t say anything more. All he did was walk away and you let him.
Sirius took your hand in his and puled you into him. “Come here, love” he whispered to you and kissed your head.
You had laid awake the whole night. Your mind was still at yesterday. The moment you stepped into the common room you were ready to start the fight again. You would start it a thousand times if you’d have to.
But the moment you stepped into the room you stopped in your track.
Sirius was laughing with James. As if yesterday didn’t happen. Like nothing had changed and in thats second you wondered if yesterday happened at all. The blue mark on Sirius cheek showed it did.
The moment Sirius saw you he ran up to you and kissed you right there. Like there was no care in the world and like no one was watching.
“Please, don’t ever do that again. I might throw up from you two.”
Your eyes turned to James and the smile Sirius left on your lips left. “I am still mad at you.”
“And you have every right to be, just like I had every right to be mad at you for keeping this a secret.” James let the silence hang in the air, giving you a moment. “I am not mad at you anymore, and I hope you won’t be mad at me anymore. Because I am truly happy for you.”
Sirius pressed a kiss to the side of your head, grasping your attention and nodding furiously.
With a sigh you turned to James. “I might be a little less mad now.”
Your finger enterwined itself with Sirius’ as he pulled you along. He gave some of the couch up for you and let you rest against his chest while you laughed along them. Just like you did last year only know so much had changed and you loved it had.