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robynlilyblack · 2 years

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Best friends little sister

Sirius Black x fem! Potter! reader

[Requested – see request here]

Summary: Harry is worried about having a crush on his best friends’ little sister so James and Sirius tell him the tale how the latter bagged y/n potter, or more like how she bagged him

Warnings: swearing, kissing, mentions of food, drinking and sex, flashbacks clearly labelled

A/n: 4.1k words, Hufflepuff reader and she is one year younger than James x sorry for the delay there will be with all of my requests right now as i have a uni exam on Tuesday x thank you for the request i really liked playing around with this for of story telling

Navigation | Sirius Black Masterlist

You opened the door to yours and Sirius’ apartment struggling with the extra groceries since your brother, Lily and Harry were staying for the week while their house was being renovated. Kicking the door closed with your foot you lean over and drop your keys on the little dish missing completely as it hits the floor

“Fuck” you quietly curse laughing a little bit

As you were about to call for help you heard a giggle, turning around still clutching the bags across your chest wiggling your face a bit as the roots from the leek tickle your nose before you focus on your nephew who was smiling at the scene before him

“Need some help auntie y/n?” he asks

“Yes please” you say pleadingly as he walks up and takes one of the heavier bags “Thank you Harry” lean forward giving him a kiss to the side of the head as you crunch up his hair with your now free hand

As Harry shakes his head trying to fix his hair you both head through into the kitchen where your brother and husband are chilling out with some coffee at the table.

As you enter James just smiles while Sirius jumps up “Darling I’ll take that” he says making you giggle as he kisses your cheek

“Where’s Lily…oh Harry you can just put that one next to Siri” you ask before pointing to the free counter, watching as Harry nods placing down the bag before taking a seat across from his father

“She was going to drop off something at Marlene and Dorcas’ but I’m sure she’s probably got distracted catching up with them” James answers shrugging “I’ll call her in a bit if she isn’t back” he nods

You smile shrugging off your coat and folding it over your arm “I’m going to go shower before dinner then” you announce giving your bother and Harry a smile and walking over to give Sirius’ arm a squeeze and a light kiss to his hair which he smiles and leans into as he continues unpacking the shopping

As you head out of the kitchen James jumps up running out after you “Sis hold on I need to use the loo first!”

Sirius and Harry let out laughs, the former finishing putting away the food and leaving out the stuff needed for tonight’s meal. Turning around he flicks on the radio to play gently in the background as he returns to his seat taking a sip of coffee. As he does he notices Harry staring off into space with a wistful look, like he’s deep in thought about something, same look James used to wear when he was thinking about his next attempt at wooing Lily

“Girl trouble?” he asks casually making his godsons head snap towards him beginning to blush

“umm…” Harry bites his lip before he sighs “yeah” he admits before his eyes light up realising if there was one person that knew how to deal with his current predicament it was his godfather “Actually can I ask you something?”

“Anything I’m an open book, what you need help with flirting, date ideas…technique” the last one makes Harrys eyes widen comedically as he shakes his head rather fast making Sirius chuckle, he probably shouldn’t have enjoyed embarrassing him as much as he did but it was just so easy

“Nothing like that…it’s more I have a situation that I think only you could understand” he confesses

“Go on” Sirius says intrigued and sincere, sensing the tone in the boy’s voice

“You know Ron?” Harry starts rather awkwardly

“Oh…” Sirius seems to catch on but sadly not in the way Harry intended “…you fancy Ron? I went through the same thing with Moony for a…”

“Not Ron…” Harry jumps in shaking his head with a disgusted look imagining his friend like that “I like Gin”

“Yes!” Harry and Sirius’ heads turn quickly to the door as James re-enters the room cheering “You owe me 2 gallons” he points at Sirius “cough up” he gestures with ‘give me hands’

“Fine” Sirius concedes reaches in to his pocket and handing it over while Harry just stares in shock “Your flies undone by the way Prongs” he nods to his friends’ trousers

“Thank you…oh cheers Pads” he hops a bit as he zips it up then takes his seat across from his son

Harry looks between the two bewildered “You bet on me?” he asks

“Yeah I bet you’d confess you fancied Ginny in your 6th year and Pads bet your last” James explains “Sorry now you’re old enough we can tell you that we’ve bet on pretty much everything” he confesses cringing

“Do I want to know?” Harry looks to Sirius who scrunches up is nose as he shakes his head

“So you fancy Ginny” James says plainly while Sirius seems to catch on

“That’s why you came to me” he looks to Harry who nods shyly

“How did you go about Auntie y/n?” he asks Sirius before turning to his dad “And how did you agree because I’m scared Ron’s going to Kadvra me” he says like he genuinely concerned of that eventuality

The men chuckle slightly “To understand we might as well tell you the full story” James says

“Yeah, so it really all began in our 6th year like you while y/n was in her 5th…” Sirius starts

Start of flashback – Sirius’ 6th year

Sirius woke to a pillow being bounced off of his head, groaning as he rubbed his eyes and sat up finally focusing on his friend “The fuck Moony?” he huffs

“Here” Remus chucks a muffin at him “Come one sleepy head we’re going to be late” he ushers for him to get up

As Sirius climbs out of bed he can hear Remus trying to get James up as well, telling him it’s his own fault he has a hangover for drinking on a Tuesday night. After lazily throwing on his clothes, picking the sleep out of his eyes and running his hands through his hair, he heads down to the dungeons along with Remus and James, who is also munching down on his breakfast

As the approach the classroom the pass by you and your friend Alex, James is the first to greet you “Hey sis” he smiles

“Hey Jams” you answer shyly

Sirius’ eyes trail over your figure, clutching your books to your chest, shoulders up to your neck as you bit your lip, you looked so adorable and smelt great, your perfume filling his senses. You were shy, complete opposite to James and arguably quieter than Remus, he got to see you a lot more over the summer now he’d ran away as before you being in the year below and in a different house meant he rarely spoke got to you

“Hey little Potter” he smirks relishing in the way your eyes shoot to him and your shy state worsens under his gaze

“Stop flirting with Prongs’ little sister we are going to be late and Peter is shit with excuses” Remus hisses before turning to you going back to his usual sweet nature “Hey y/n, Alex” he gives you and your friend a smile before motioning for the others to follow

“Bye sis” James waves as he leaves while Sirius just gives you a wink chuckling as you look away quickly

Soon they get to Slughorn’s class, luckily, he was a pretty chill professor so he was fine with their tardiness. As they take their seats they notice a potion being passes around the class, people taking a sniff of it before proceeding to say a bunch of random things after

James nudges Peter’s back to get his attention “Wormtail, what’s in the vial?” he points to it currently being handed to Marlene by Alice in front of her

“It’s amortentia, we’ve all to take a sniff and write an essay on it” Peter explains which causes James and Sirius to groan at the idea of an assignment

“What’s amortentia it sounds familiar?” Sirius asks noting that Marlene’s smells sound rather like the curly haired girl next to her

“It’s love potion” Remus says shortly “The smells are what attracts you”

James’ face lights up while Sirius starts to feel anxious but he doesn’t understand why “Hey Dorca is passing it to Lily” Peter whispers pointing to the redhaired girl

Break in flashback

“Mate this is me and y/ns story” Sirius nudges James annoyed

“What? I can’t tell my son how I found out Lily liked me” James looks towards Harry for back up

Harry chuckles nervously “Sorry dad but you’ve told me this about a million times” he cringes making Sirius smile triumphantly and his father huff in defeat

“Okay where were we…”

Resumed flashback

“Go on mate” James motions for Sirius to give the vial a sniff

Leaning it he feels everyone’s eyes on him, it wasn’t unknown that he was a flirt but whoever he smelt was about to he be famous. He breaths in the scent, first its something familiar, James’ mothers baking, then its Remus’ chocolate and then, he freezes, it was you, your scent.

“Mr Black?” Slughorn prods “What do you smell my boy?”

“Umm” he panics “some kind of baking, chocolate and perfume” he says vaguely and it’s enough to satisfy the professor, his friends however seem to eye him

For the rest of the lesson he barely paid any attention, just let James gush about Lily. In truth he hoped that would distract everyone from asking about his own smells. Of all the girls of course he would fall for the one he couldn’t have, his best friends little sister, the same baby sister James had told the marauders but in particular him not to ‘fool around with’. For the rest of the day he did his best to avoid running into you as he tried to decide what to do. Should he tell you or should he ask James first and risk one to the nose? Would you even like him? What if your flustered because his flirting made you uncomfortable or you only saw him as your older brother’s mess of a friend?

He’d managed to successfully avoid both you and the conversation of his amortentia until that afternoon when he ran into you and by run into, James screaming down the hall to get your attention “SIS!”

You stop walking and look at your brother wide eyed before smiling awkwardly with a small hint of fear as they approach you “Hi” you squeak out

As James started gushing about Lily and you listened nodding along Sirius took a minute to really admire you. Sure, he’d always found you cute, but you were funny too, there were times you let out a small one liner that would kill the room, you were also smart, smarter than him, not to mention you were an utter sweetheart. Now he was aware of his feeling he felt a bit breathless in your presence but kept his cool composure on the outside, that was of course until you turned to him with those little doe eyes of yours

“So, what did you smell Siri?” you ask in a tone he could almost say was hopeful

“Ugh…” he freezes half by the question and half from the nickname that made his heart do little flips “Your mums cooking…” you and James smile at that “Moonys chocolate…” your smiles widen “and…” he looks around “Clementines” he says randomly after glancing at some girl eating one down the hall

End of flashback

“Why did you lie?” Harry looks at his godfather confused

“I was nervous, scared your dad was going to kill me…” he looks at James that shrugs casually “Of course I immediately regretted it seeing the disappointment in her face” he grimaces, he still regretted to this day not making a move sooner

“Wait…” Harry thinks for a second “You two got together in your last year, right?” the men nod “So you didn’t tell her for a whole year?” his mouth drops open

“Actually” James butts in smirking away “He never told her” Harry tilts his head

“I didn’t” he confirms “She actually made the first move almost exactly a year later”

“She did?” Harry looks more confused than before “But auntie y/n won’t even order for herself at muggle restaurants she’s so shy”

“She is but that day she was more Gryffindor than me” Sirius admits

Start of flashback - Your 6th year

You were headed to potions, you had missed breakfast because you had pulled an all-nighter rewriting your essay which had got ruined. On your way you felt a bit faint, wishing you had at least grabbed something, luckily for you a certain raven-haired boy came to your rescue

“Hullo little Potter” he jogs up to you with a smile

“Oh hi” you smile back it was rare to talk to Sirius alone, usually your brother or his other friends were with him

“Here” he holds out a muffin for you “Noticed you weren’t at breakfast” he shrugs casually

“Thank you, Siri” you smile at him accepting the food

“Is there a reason you missed breakfast?” Sirius asks trying his hardest to not let his heart crack at your appearance, it looked like you had slept in your clothes and you had a red mark on your neck

“Amos…” his heart shatters “burnt my essay to a crisp, even singed me and Alex” you gesture to you birn mark

“Really!” he says far too euphuistically even scaring himself “Sorry…” he laughs it off a bit embarrassed but he was so happy you weren’t with anyone, he knew one day it was going to happen but he was just glad it wasn’t today “How did he burn it?” he asks interested

“Oh well he sneezed with his wand in his hand…” you explain cringing “merlin help us if he gets the flu” you joke quietly making the boy bark out a laugh

You giggle as well, proud of yourself for making him laugh “Well I need to…skip class busy stuff you know. See ya later Little Potter” he throws you a wink walking off to who knows where leaving you with a smile plastered on your face the whole way to class

Sitting down you see Slughorn passing around some kind of potion “Alex?” you nudge your friend “What is that?”

“Amortentia, shame you were late cause you missed a few people revealing their crushes” Alex chuckles as he explains

“Like the love potion?” you confirm starting to get nervous

“Mr McConnell what do you smell?” Slughorn asks as Alex is handed the vial

Alex takes a large sniff smiling “Vanilla, freshly cut grass and…” his smile widens “…strawberries” he hands the vial over to you bliss as he knows exactly who it is

“Miss Potter” the professor gives you a nod

You bring the vial to your nose taking in the scent “Umm…my mums baking, books and…” your eyes widen “…something smoky” you say vaguely while Alex bites back a knowing smile

As the lesson continued Alex kept writing little notes in the margin of your parchment, writing some muggle song that went ‘Y/n and Sirius up a tree K.i.s.s.i.n.g…’ or little hearts with your initials to tease you. You let him do it, as he started to draw a rather cute sketch of you and Sirius kissing your mind was running wild.

You really did like Sirius, you always did, he was your brother really handsome friend how could you not, you had a crush on Remus too but that faded away after a couple of months while Sirius’ stayed and only got stronger as the years went on. It progressed to full blown love after he ran away to your house and you spend half of that summer together, you never spoke all that much he usually just sat outside and enjoyed the sun while you read quietly nearby. The summer passed you spent even more time together as James was off with Lily a lot now they had confessed, sometimes you could have sworn you caught him admiring you or seen his eyes trail over your body when you wore shorts and a vest out in the summer sun.

Sirius was popular with everyone, he dated a lot but since the end of his 6th year you hadn’t really seen him with anyone, if anything he seemed to catch your eye more often and have some reason to be with you, like this morning he noticed you probably wouldn’t have eaten and brought you your favourite kind of muffin. You weren’t the best at talking or being brave but something in you just needed, itched to tell him how you felt

After potions you headed to the library, you usually joined in to study with James’ friends then, so it would be a good opportunity to get Sirius alone. Walking in you see your brothers’ friends already there along with Amos who is awkwardly perched on the chair at the end, clearly unsure of how to make conversation without you and Alex.

“Hi” you say quietly gaining their attention, receiving warm smiles from everyone as they glance up, your eyes meeting Sirius’ who lingers a second longer than the rest before returning to ‘study’

“Hey Ams” Alex greets as he sits next to Amos earning a thankful ‘hi’ back

“So how was Potions?” Lily asks kindly

“Oh, we learned about Amortentia” Alex answers in a playful sing song-ey tone that makes Amos catch on, both giving you knowing smiles

Your bit of confidence was fading so you acted fast “Um Siri can you help me find a book?” you say quickly standing up

His eyes widen before nodding “Sure” he stands as well following you out

When you are far enough away James and the others make bets…

Break in flashback

“YOU KNEW!” Sirius exclaimed almost knocking over his now cold cup of coffee

“Well yeah” James says like it was obvious “You’d been making eyes at her for years, I was just betting how long it be before you finally admitted it. Mate, if it makes you feel any better we all lost because y/n make the first move”

“GUY!” Harrys gains their attention “You were getting to the good bit, come on!” he huffs impatiently

“Oh, sorry Harry” Sirius chuckles

“Yeah so, where were we?” James turns to Sirius

“Getting a book!” Harry answers for them

Resumed flashback

“So what book is it?” Sirius asks as you walk deeper into the library

You stay quiet for a moment “It’s just up here, I couldn’t reach it last time” you lie turning back to desperately think of a book you could pretend to need, realising this is a lot harder than you think

Sirius nods he was following you blindly, he would follow you anywhere if you asked, but right now all his mind could think about was what or more who you smelt in the amortentia. You stood up quickly, clearing using the book as a way of avoiding the conversation, he didn’t blame you for that especially since your protective elder brother was present. What he couldn’t get over was it was clear your friends had someone in mind, which meant you did fancy someone and that made his heart ache

Soon you stop, spotting a book you did actually need but weren’t planning on getting for another week “It’s that one, the green one” you point to it

“Alright” Sirius goes on his tiptoes before climbing ever so slightly on the bottom shelf to retrieve it, as he comes back down he stumbles into you, trapping you between the opposite bookshelf and himself as he steadies himself “Y/n you okay? I’m so sorry” he apologises checking to see if you are okay

Your faces were the closest they had ever been, you gave him a small nod to which he smiled, lingering before he started to move away. This was your chance so you lunged forward and placed a quick kiss on his lips, pulling back as quickly as you jolted forward gaging his reaction. Sirius seemed to just stare at you in shock for a moment, clearly processing, did you…did you really kiss him and kiss him first?

“I’m sor…mhm” you begin to apologise but this time he lunges forward capturing your lips, dropping the book you ‘needed’ to cup both of your cheeks

He kissed you like there was no tomorrow, which could have been true as he was sure James was going to kill him the moment he found out.

Both of you were smiling like madmen when he pulled away, hands still on your cheeks “I can’t believe you…” he shakes his head in disbelief “…if your brother doesn’t kill me be mine?” he asks

You start to nod timidly as your confidence fades returning to your usual shy self when you brothers voice comes from further down the shelfs “What’s going on here?” he says in a playful tone but that’s lost on Sirius as he panics jumping back from you

“James it’s… it’s not” he starts taking steps backwards as James walks forward, meanwhile the rest of the gang who you can only assume had been hiding there the whole time watch amused

“Strawberry?” Amos asks as he takes a bite of one while holding the little tub up for the others

End of flashback

“Then he chased me around the library for about an before we were kicked out…I can’t believe you knew and you still played with my emotions like that” Sirius crosses his arms annoyed

“One I didn’t chase you…he ran away like a little baby and I just followed you to make sure you were okay” he turns to Harry who looks more than entertained “And two, she’s still my baby sister I had to at least put the fear of Godric in you to make sure you didn’t break her heart” he says genuinely his protective brother side sounding quite similar to his protective dad side to harry which makes him smile

“So after that you started dating?” Harry ask to which Sirius nods “And dad you were okay with it?”

“Yeah, trust me Harry I know Ron’s a bit…” he makes a ‘going over their head’ gesture “But he probably already knows…I mean Sirius had more trouble convincing your grandparents than me but you won’t have that problem” he reassures his son

“Molly’s like your second mum while Euphemia loved me too she thought I was too irresponsible to be with your aunt” Sirius shrugs “But she came around” he says hopefully

“mmm” James hums sceptically

“What?” Sirius turns to James in shock like his life is a lie or something “I’ll be back I need to ask y/n” he says standing up and heading out the door while James and Harry burst out in laughter

“So, you think Ron will be okay with it?” Harry askes looking a lot lighter than before

“Yeah, Ginny will always come first for him and he’ll worry but he knows you and he trusts you so he’ll know in his heart like I did that you would never do anything to hurt her on purpose” he gives him a reassuring smile

Meanwhile Sirius walks into your bedroom “Darling does your…well hello there” he smirks seeing you in just your towel bent over as you try to find something in the bottom drawer of the dresser

You snap upright at the sound of his voice turning around “Hi Siri” you give him a warm smile before glancing back at the drawer “Do you know where my red…” as you turn back to him you trail off seeing him grinning at you “What?” you start to feel a bit shy with his eyes on you

“You’re so beautiful” he notes walking up to you and placing his hands on your towel clad hips “Can I ask you something?” he tilts his head

“Anything” you say truly

“Does your mother like me?” he asks with concern

“When we started dating? No…When we got engaged…also no” he smiles but it drops “Now? Yes, but she also thinks the wooden sculpture of her patronus can talk” you shrug cringing

“I’ll take what I can get…” he laughs before pushing a damp strand from your hair “So” he looks at you cheekily “Guess who Harry has a crush on…”

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