a marauders guide to siblings
Sirius Black x Potter!reader + moonwater + jily [1.4k words]
CW: fem!reader, reader is James' twin, siblings
James loved love. Like, if someone were to ask James what his favourite thing was, first he would say quidditch, then he would say pranking, then he’d probably say his beautiful girlfriend Lily, and then he would absolutely without a doubt say love.
Oh, and maybe also he’d say ABBA, but the order wasn’t important, alright? The point was: James loved love.
So, once the rest of his mates found partners of their own (save Peter), he immediately began begging them for a triple date. But for as mischievous as his friends were, they were equally (if not painfully more) stubborn.
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“Please!?”
“I said no, James.” Remus sighed as he rubbed harshly at his eyes; and sure, perhaps cornering him in the hospital wing following a full moon when he had nowhere to run nor hide from James’ pestering wasn’t very couth of James, but in James’ defence, he-
“POTTER.” Regulus barked from the door to the hospital wing that he just burst through, completely ignoring the reproachful shushing from the matron. “I swear to Salazar if you do not step away from my boyfriend, I-”
Except James never got to hear what Regulus planned on doing if he did not step away from his boyfriend because James - a smart man - chose that moment to shout “promise me you’ll think about it, moons!” before fleeing from the room.
It had gone just about the same with Sirius.
“No can do, Prongsie boy.” Sirius drawled without looking up from his study notes.
“And just why not?” James spat, obviously having had it up to here with his sodding no good best friends anyone could ever ask for.
Sirius hummed as he looked off into the distance like he was giving this question actual thought. “Oh, right. Because I don’t want to.” He deadpanned.
“Why not.”
“James.” Sirius hissed as he sat up straighter, eyeing the librarian who was eyeing the two infamous marauders right back. “I have no interest in sitting at a table with my brother as he makes googly eyes at my best friend, nor-” he paused as he held his hand up when James went to interject, “do I want to sit at a table with my girlfriends brother as I make googly eyes at her.”
“Then just don’t make googly eyes at my sister.” James hissed back, earning him a scoff.
“Have you seen your sister? That’s impossible.”
“Eugh.”
“See.” Sirius accused, raising a knowing eyebrow at him. “I’m not doing it.”
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But if there was one thing James hated in equal measure as he loved love, it was quitting.
And in case that wasn’t clear; James hated quitting.
“Oh good, you’re all here.” You announced robotically as you approached Remus, Regulus, Lily, and Sirius at the Gryffindor table in the Great Hall.
“You alright, Potter?” Regulus questioned slowly, looking between Sirius and Remus concernedly as they both let out a groan.
“What now?” Sirius muttered as he pinched the space between his brows.
“I’m supposed to say…” you continued, pausing to pull a cue card from your pocket and reading directly from it. “As you all know, the wonderful and momentous anniversary of James Fleamont Potter’s birth is approaching-”
You hardly spared a breath for the unimpressed snort from Remus at the fact that you and James shared a sodding birthday.
“-and his one wish - in place of any gifts - is for all of us to accompany him to one triple date at The Three Broomsticks on the next Hogsmeade weekend.” You finished, only looking up at the group when you finished reciting your script before pocketing it again.
“What exactly do you get out of this arrangement?” Lily asked as she leaned back in her chair.
“A triple date?” You answered in the form of a question.
“What do you really get out of this?” Remus asked with a laugh.
“James promised me an unlimited amount of jelly slugs for the rest of the school year.” You offered bashfully.
“Oh.” Sirius groaned theatrically before pulling you into his lap. “My poor sweet girl, being coerced by means of sweets.” He cooed pathetically into your hair.
“Does that mean you’ll do it?!” James shrieked excitedly as he appeared out of bloody fucking no where.
“Circe’s fucking tits.” Regulus hissed as he clutched at his chest.
Sirius scoffed as he removed one arm from around your waist to gesture at his brother. “Look what you’ve done now, James; you’ve reduced my baby brother to swears and blasphemy. What do you have to say for yourself?”
“Please?” James asked quietly; puppy dog eyes darting nervously between his best friends, his girlfriend, his best friend’s boyfriend, and his sister.
And finally, after months of begging and badgering and whining and pestering, James finally got his triple date.
Except…except something was bothering James…
Which was weird, because it was perfect.
James got to see Regulus smile for quite possibly the first time ever when Remus offered him a bite of his meal from his own fork and then immediately stole a kiss when Regulus wasn’t paying attention.
For as wound up and fidgety you’d been on the walk down to Hogsmeade, James watched any and all tension melt from your body the second Sirius pulled a chair out for you, situated himself in the spot next to it and threw his arm over you like that’s where it was simply meant to be.
And the sound of Lily’s bubbling laughter echoed somewhere deep in James’ rib cage every time Sirius or Remus took the piss at James’ expense.
“Oh, James, you’d really like this.” You insisted then, interrupting James from his musings as you held your plate out for him to take a helping for his own plate.
“Awe, you guys are sweet.” Lily commented before she accepted a bite from James who had, indeed, really liked what you had ordered.
“Remus is already feeding you enough over there, don’t even think about it.” Sirius called over to Regulus who was actually not thinking about it at all, thank you very much, earning him a glare from his brother.
And that’s when it hit James.
“Wait a second.” He commented, causing everyone to look at him warily. “Sirius is dating my sister,” he started, ignoring Sirius’ groan and Remus’ quiet ‘here we go’, “and Remus is dating Sirius’ brother…then what about me?”
Regulus let out an inelegant snort as Lily scoffed in offence. “What do you mean ‘what about me’!?” She shrilled.
“Prongs, listen,” Sirius whispered conspiratorially, “I don’t want to alarm you, but you’re very close to losing the girl you spent six long years trying to snag.”
But before James could blanche (or beg for Lily’s forgiveness), Remus chuckled. “Don’t worry, James. I’ll claim Lily as a sibling and then you can be dating my sister.”
“What the fuck?” Regulus muttered at the same time Lily murmured “you’ll what?” and James cheered “that’s brilliant!”.
“Why on earth would that matter?” Regulus asked, though the end of his sentence trailed off when you started shaking your head.
“It’s best not to question it, Reg.” You offered him knowingly.
“Fine.” Lily muttered, nodding her chin over at Remus. “Then you have to share your chips.”
In response, Remus lobbed one across the table, hitting her right in the forehead which started a petty sibling squabble right there in the middle of The Three Broomsticks.
“Yes.” James whispered reverently. “This is perfect.”
“Were the jelly slugs worth it then?” Sirius murmured into your cheek as James cackled at the pettiness between the pseudo-siblings and Regulus threatened to bring them all back to the castle with no dessert if they didn’t smarten up.
You smirked as you turned your face towards his, though he made no effort to create space for you which left the two of you basically nose to nose. “At least I got something out of this.”
“I got something out of this.” Sirius said easily, continuing when you raised an eyebrow at him. “I got to spend an evening with my girl. That’s worth any nonsense.”
You smiled before pressing a chaste kiss to his lips, reciprocating quickly when he greedily demanded more. “Well then, happy birthday to James Potter, I guess.”
Happy birthday to James, indeed.
© ellecdc; do not copy, translate, or repost my work anywhere under any circumstances.
