James Potter Dating Sirius’ Younger Sister (Head Canons)
Note: These are just random stuff, it has been sitting in my notes app for a month or so? Enjoyy
Oh boy, you are in for a wild ride; just imagine all the chaos this would bring. Best believe you always have a stupid prank to worry about around the corner when your brother and boyfriend are pranksters.
You were a year younger than Sirius, being the middle child, and Regulus the youngest, it wasn’t surprising that you were kind of shunned by Walburga and Orion. You’re a girl, you cannot pass the Black family name onto your children, you were also not the heir. Luckily, big brother Sirius quickly took you under his wing and became the parent figure in your life.
You were sorted into Slytherin, along with Regulus much to your older brother’s dismay.
He threw a fucking fit and practically felt his soul leave his body the first time you told him. Sirius even went as far as tearing up and looking out the window, defeated. (And quite dramatically)
“You should’ve been a Gryffindor, Y/n! I don’t even know why the sorting hat put you in that evil house!” Sirius huffed, pouting.
“Regulus is also in the same house as me, brother.”
“Well it was quite obvious that he was meant to be a Slytherin, Regulus has a stick up his a-“
Although the Marauders mainly pranks the Slytherin students, you were an exception. How could Sirius prank his adorable little sister? You don’t deserve it! (also because James is a tad bit overprotective when it comes to you, Sirius just chalks it up as James being respectful to his younger sibling.)
“Siri, please don’t make Reggie suffer too much.” You plead to your older brother, puppy eyes activating as you heard their plans to set a nasty prank to slytherin students earlier. Sirius’ features soften, “Alright, I’ll talk to James. He’ll be the one to decide.” He pats your head, already formulating an apology for the prank he’s sure will not be cancelled.
James has been harboring feelings ever since he saw you on the train ride to Hogwarts with Sirius in his second year, so it was quite obvious what his opinion is on the matter.
Sirius randomly starts later that evening, “Prongs, Y/n was asking if you could exempt Regulus in our prank-“
“Oh don’t worry I’ll cancel it.”
Peter sputters “You’ll what?”
James looked at them “What? Let’s give them a day off.” Remus did a double take and actually sets his book down after placing his book mark. Yeah, that's how you know it's serious.
“We’ve been planning this for months-“
“Did I stutter, Wormtail?”
The hold you had on James though, seriously.
James Potter is whipped for Y/n Black.
You want some food that the house elves didn't prepare for dinner? Don't worry, James is on the case! He will run to the kitchens and bribe the house elves to make you some of your favorite dishes and what you're craving.
“What’s with the long face, princess?” Sirius asks, seeing you slump down next to him, looking quite defeated.
“Just some housemates, I couldn’t study well because of them.” You grumbled, pulling out your Herbology textbook and trying to focus.
Prongs frowned, snapping him out of his daydreams (which were probably about you.)
“Who?”
James want names.
Who dared interrupt his sweet girl’s (still not his girl though but we don’t talk about that) study session?!
Remus, being the observant sod he is, looks at Prongs, amusement swimming in his eyes as he takes in James’ angry and protective form.
Remus and Peter already has a hunch that Prongs fancy Padfoot’s little sister like… about a few months or so?
James doesn’t really even try to hide it, although it was one of the greatest unsolved mysteries on how Sirius still hasn’t figured it out.
“You reckon Padfoot’s just playing dumb? Even an oaf could see Prongs making heart eyes at Y/n.” Peter stated, snacking on some chocolate frogs as he sat on his bed.
Remus rolled his eyes, also sitting in his bed at their dorm room. The boys in conversation were in their quidditch practice. “He’s quite thick, I bet he wouldn’t even know until they started dating.”
“But Y/n’s innocent- doesn’t even know how lovesick James is.”
Peter was utterly wrong about that part.
You know that James likes you, although you try to ignore it, you can’t.
Because you like him back.
“Go out with me?”
You felt yourself blanch, hearing the familiar cheeky voice behind you.
You nearly broke your neck as you spun around to see James holding a bouquet of your favorite flowers while sporting a nervous smile.
“Does my brother know this?”
“Do you think I’d still be here alive when I tell him I’m utterly inlove with his younger sister?”
Sirius almost busted a blood vessel when he found out.
Remus had to physically restrain him from lunging at James.
Yea sure, Sirius views James as his brother from another mother BUT BROTHER-IN-LAW?
“Bloody hell, Pads! Calm your balls down!” Remus grunts, back hugging the boy as he desperately tries to wriggle out of his mate’s grasp.
“No! Let me go, Moony! I just want to have a chat with Prongs!”
“Chat my ass! You were about to bloody knock the living daylights out of him earlier!”
It took a while for Sirius to wrap his head around how one of his brother-from-another-mother fancies his younger sister.
He won’t lie, he felt betrayed by James for a short amount of time. He distanced himself (for a day, lol) but of course, he couldn’t stay mad at James.
Realistically speaking? James and Remus are the ones who are good enough to date you for Sirius.
“Do you love him?”
Sirius approached you one time in a random hallway. Youwere caught off guard with his question. You never saw your brother serious like that before.
“Sirius, what are you talking about?” You tried to feign innocence, but Sirius saw through that.
“James. I know he fancies you. Have you been shagging-“
You quickly clamped Sirius’ mouth with your hand, looking at your surroundings to check if anyone heard what he said.
“Salazar’s balls, brother! I still have my virtue!” You hissed, “Besides, I’m saving it for marriage.” You told him, making his tense shoulders relax.
“Atleast there’s something good that came out of those boring lectures Walburga taught us.”
“I am not a whore like you, brother.” You snickered, a playful smirk present on your face as Sirius slowly processed what you said.
“Why you little-“
It would take some adjustments for Sirius as he slowly takes in the fact that you and James started dating.
It doesnt help the fact that James always proclaims his undying love for you every chance he gets, which is every time.
Although, before he even asks you to be his girl, he talked to Sirius first, asking for his blessing.
Who is Sirius to deny his little sister and Prong’s happiness?
“I just love her so much…” James sighs dreamily, watching you from the Gryffindor table as you ate in silence beside Regulus, who was uncomfortable and tries to shield you from James’ looks (which he finds creepy).
Sirius can feel his eye twitch.
“Can you stop that Prongs? Just say that to her when you’re alone in a room.”
James frowned, “But you don’t allow us to be alone-“
“Exactly, Prongs. I don’t care if she’s your girlfriend—wife even. She’s my younger sister.”
James perked up, “So you’re alright with her being my wife?!”
Hogsmeade dates with James always.
He would buy you anything and everything you land your eyes upon more than 1.5 seconds.
“Honey, you don’t have to get me that necklace.”
He frowns, looking like a kicked puppy. “But you were staring at it!”
“It just crossed my line of vision-“
James certainly went back and secretly bought it for you.
No one can stop him when it comes to spoiling you.
Effie and Fleamont absolutely adores you.
“So, when is the wedding?” Effie smiled, looking at you and James expectantly
Cue Sirius choking in the background.
You blushed as James cleared his throat awkardly, a beet red blush already dusting his cheeks. “Mum…”
Effie blinks, acting innocent. “What? You guys are about to graduate from Hogwarts in… three months or so!”
Your family found out about the relationship.
Walburga’s stinging slap was marked on your cheek. “Have we taught you nothing, girl?!”
Regulus watched worriedly from the side, feeling helpless as Walburga continued to shout and curse at you.
“You good for nothing brat! I should’ve married you off ages ago! To think you’d turn out to be your older brother… Leave! And never come back as you will be no longer welcomed in the house of black!”
Regulus begged to take him with you.
Having nowhere else to go, you knocked on the door of the Potter Manor tiredly, holding your suitcase and Regulus looking around nervously.
Sirius was the one who answered the door.
“she hit you…” James muttered lowly, softly placing his warm hands on your cheek.
“It’s nothing, James.” You shrugged.
“We’ve suffered worse. I’m sure you’ve known that by now.” Regulus told him quietly, not looking up from his cup of warm tea as his eyes flickered to Sirius.
From that moment on, everything seemed to be better.
You’re happy to get out of the abusive household. Bringing Regulus with you, being reunited with your older brother, and hanging out with your boyfriend anytime you want.
Finally graduated from Hogwarts, James decided to pop the question.
“Padfoot..? You in there?” James nervously knocked on Sirius’ bedroom door.
“In here, Prongs! Hold on.” James heard shuffling before the door opened to reveal Sirius rubbing his eyes, seemingly woken up from a nap. He opened the door to let James in his room.
Sirius eyes him, noticing how fidgety one of his best friends are, his mind assumed the worst.
“I swear to Merlin, Prongs. If you got her pregnant and don’t plan to be responsible for it I’ll-“
James sputters, “What?! No! No one’s having a baby!”
Sirius visibly relaxed, “Then what’s gotten you looking so troubled?”
James pulls out a velvet box from his pocket and opened it to reveal an engagement ring.
“Erm… I’m not Y/n, Prongs.”
Cue a face palm from James, “I’m planning to marry your sister, not you, Pads. I’m asking for your blessing.”
Sirius didn’t think twice before giving him his blessing.
Which was why he and Regulus were dragged alongside Remus and Peter to plan a prefect surprise proposal.
“No no, it’s a bit crooked on the right.” James told Regulus, who was setting up the picnic blanket.
“Sirius, remind me again why I have decided to help this stupidly nervous sod?” He deadpanned to his brother.
“It’s for Y/n, Reggie.”
Regulus frowns, scrunching up his nose as he watches James run around like a headless chicken who’s trying to oversee everything.
“Right…”
“Where’s the ring?!”
Regulus could only sigh as he watched James panicking and looking in every nook and cranny, searching for the velvet box with the ring inside— that was obvious in his back pocket, where he placed it five minutes ago.
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Headcanons that can and will make up how I write the Marvelous Bats AU I’m trying to actually write
Everyone has a minor upgrade or addition on the powers they have. Eugene has his technokinesis, Pedro is physically stronger than Billy even though they have the same blessing, Darla is faster, Freddy has some minor telekinesis and is better at flying in practice, and Mary’s courage is infectious to the degree of getting people out of being scared frozen in an emergency and getting them to rescue themselves and have the bravery to help others along the way.
Billy and Mary are still twins, she’s adopted by the Bromfields and Billy is newly fostered by the Vasquez’s but they all work and spend time together as a family unit despite the separate home lives
Billy knows how to make portals anywhere with doors, the place just needs to have a door. (He has tried getting the Batcave that way but apparently the car doors of the Batmobile don’t count)
Yes all the Bats know the Marvels identity’s and vice versa, the rest of the League? Nope. Just think Batman mellowed out in his crusade to learn Caps identity
Yes Bruce wanted to adopt Billy, Billy said screw that and Jason pointed out how bad of an idea it would be to have a kid named Batson in the public eye of Gotham. “The Joker can and will try to make a bad joke out of the kid Bruce.” “Yeah Batman, you want me to die in a robin costume of all things?” Bruce just stayed silent for a moment and almost started crying (it’s was only a week later Jason took a good look at the kid and realized Billy is a mini him and Bruce probably didn’t like the Robin comment)
Damian, Darla, and Jon are the true kid hero trinity. Their mission? Chaos
Freddy just about passed out when he met Barbra, the super amazing Batgirl is the super cool lady behind the monitor that’s one of freaking Batman’s most essential teammates? Oh the feeling of finally seeing a super like himself
Tim met Billy and Mary’s parents through his own when he was little, the 3 of them had a very long discussion about cool archeology stuff for a good few hours
Because his hero form is his “full potential” and is very big Pedro asked Jason to help him get from how he is now to his hero form, seeing as his body type was closest. Now they work out together every Tuesday and Friday (school and vigilante work permitting) half of it is actually working out and the other is building Pedros confidence
Batman and Captain Marvel make a point to block and argue heavily against any other Marvel joining the League, Billy is the only one until the rest of the family does meet the age requirement they have. Billy does the heavy lifting expected of the actual Champion of Magic and his siblings enjoy the small town hero life and look out for Fawcett and the Rock when he’s off world, Mary is the defacto leader when he’s gone.
Like how every Bat has their designated Super and sometimes Wonder, they all have a Marvel they hang out with more than others. Mary and Dick hang out and bond over being the unfortunate voice of reason siblings, Darla is the childish influence making Damian act more his age and love doing it. Billy and Bruce are the respective “heads of the family” and Bruce checks in a lot on how Billy’s life is going with the occasional leadership tip thrown in to help with hero work. Jason tutors Pedro when they’re both visiting, if they cross paths on the job they’ll talk sports a lot. Freddy and Eugene talk a lot about strategy’s, games, gadgets, and superpowers with Barbra and Tim.
Tawny and Alfred are golfing buddies, they also build miniatures of flag ships together and talk about their weird family of supers over tea
Eugene has hacked the Bat-computer on multiple occasions, each time to make an edit to any files Bruce makes of the family, mostly something childish like adding “the amazing” or “the super awesome” before their hero names in the files. But one hack he did was into his contingency plans files, which nearly gave Bruce a heart attack thinking there was going to be another accident that would almost kill his friends.
The hack was the change of “Further research needed to figure out a strategy for neutralization, for now the best strategy is to trick or force them into using their trigger phrase to de-transform before incapacitating them” to “let their siblings deal with the situation”
The Justice League’s first introduction to Captain Marvel was during a “Superman is being affected by Red Kryptonite” situation. By the time they caught up to him in Fawcett their resident hero was helping the man up and panicking over how much he hurt him trying to wrestle the Kryptonite off him, they offered him a seat with them by the end of the week after satellite imaging showed that he led Superman into the air after he knocked down a building and delt with him without further damage and Superman’s account that he broke his arm and bruised multiple ribs trying to stop him. Billy was 9 at the time and only had his powers a few months at that time so he had no idea how much he needed to reel his strength in and was panicking too much to properly do so either way in that fight.
Damian was jealous that Billy got into the league so young and Bruce still won’t let him on despite his capabilities but realizes Billy only got so far because of a lie of omission and one event where he severely harmed Superman, he’d call his father an idiot if he hadn’t tried to keep an eye on such a worrying individual
The Vasquez’s know their kids visit the Wayne’s every other day, as do the Bromfields, but only Vic and Rosa know about the superhero part of it all. The Bromfields just think Mary is visiting a girl friend and having sleepovers every so often, they aren’t entirely wrong since she does hang out with Cass and Stephenie but they don’t need to know her whole superhero life. It’s framed as a mentorship so that their kids can do their best with the powers given to them with a healthy amount of encouragement in still being kids and attending school, it’s mostly just the two families spending time with eachother though.
Black Adam used to antagonize the Marvel Family but after a fight with Billy 1v1 he saw he was a child and stopped trying to actively kill him, he’s now their weird uncle figure who pops by to show them some fighting moves and try to tell Billy to stop being the champion until he’s older.
Black Adam is closer to the movie version solely for the purposes of expanding the family size, he looks like his classic comic self but has to shift in morals and backstory he had in the movie
The fight happened in a empty patch of dessert outside Khandaq when Billy was 11, no one on the League knows why they suddenly stopped fighting or why Cap officiated the guys wedding but their happy he figured something out so his city didn’t get torn up every month by their fights anymore.
The hero names and nicknames for the Marvel family are as follows
Billy Batson —> Captain Marvel (Cap, the Captain)
Mary Bromfield —> Mary Marvel (Mary)
Freddy Freeman —> Lieutenant Marvel (Lieu, Captain Marvel Jr. (by one annoying reporter))
Pedro Peña —> General Marvel (The jolly green giant, Greenie)
Eugene Choi —> Chief Marvel (Chief, Master Chief (self proclaimed, never used))
Darla Dudley —> Ms./Princess Marvel (Ms., Missy Marvel, Missy (Used for professional purposes) Princess (Used every other time as her choice of code name))
Adriana Tomaz —> Isis (/got the amulet of Isis as a wedding gift from Darla from the Rock, she didn’t know what it was but is happy she got cool powers with the rest of the family/)
Amon Tomaz —> Horus (/name changed from comics to coincide with the change in family dynamic between him and Adriana from siblings to parent/child/)
Theo —> Black Adam/Khem Adam
Shout out to @thefantasmarex for reminding me how much I love these two families together
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