One place I've had luck with is filtering by the 'Sirius Black & Marauders Era' tag on AO3 and then just combing through manually. It's tedious, but a lot of writers won't explicitly tag a story as 'young Sirius' or a crossover unless it's a major plot point. I found a decent 'Sirius Black in 'The Umbrella Academy'' fic that way, where he gets dumped into the 2019 timeline as a kid. The author mostly focused on the fish-out-of-water stuff with the Hargreeves, which was fun.
Another trick is searching for 'Black family magic' AUs that aren't strictly HP universe. Sometimes those bleed into crossovers with other magic systems, like 'The Dresden Files' or 'The Magicians', where a teenaged Sirius is exploring a wider magical world. The quality is hit or miss, but when it hits, it's a blast. I usually skip anything tagged 'harem' or 'OP Sirius'—that tends to be less about character and more about power fantasy.
Tumblr's still weirdly good for this if you know who to follow. I followed a blog that exclusively reblogs Sirius Black-centric art and fic, and they occasionally signal-boost crossover WIPs. Found a short but sweet 'Young Sirius in 'Percy Jackson'' piece that way. The algorithm is useless, but human curators aren't.
Honestly, the best recs I get are from Discord servers dedicated to rare pairs or crossover fans. There's one for Marauders-era stuff that has a specific channel for crossovers and dimension travel. Someone there linked a fantastic, almost novel-length fic where a young Sirius gets swapped with a young Jaime Lannister from 'Game of Thrones'. The culture shock and the way their core personalities—both arrogant, both trapped by family expectations—played off each other was incredibly well done.
It's not on the big archives, though. The author posted it on their personal site and linked it in the Discord. That's the thing with niche requests; you sometimes have to go where the obsessive fans congregate. Forums are dead, but small, active Discord communities are where the deep cuts live.
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The Alpha's Unwanted Luna Series
Miss L
9.4
1.9M
This is Currently an Omnibus!
Featuring:
Book 1: The Unwanted Luna - Kennedy and Ryker's Story
Book 2: The Warrior's Mate - Finn and Greta's Story
Book 3: Taming the Alpha's Heir - Ben and Elara's Story
Book 1:
Kennedy is a human thrown into the unbelievable world of the supernatural when her parents die in a freak car accident and her mother’s best friend steps in to become her guardian.
Her mother’s best friend, Beth, is the Luna of the Silver Crescent Pack. Kennedy has known Beth and her husband James and their son Jeremiah her whole life, but thought pack life would be something she would only hear about.
The Alpha and Luna keep no secrets about the dangers of their world for a human like Kennedy. Jeremiah takes an interest in keeping Kennedy safe and helps her through the trauma of moving on from the accident.
Kennedy is taught pack ways and for the most part is loved by all the pack members, learning the values of the pack bond, the ways of the warriors and respect for the hierarchy of the wolf culture. She becomes a very proficient warrior even with only human strength and senses.
Follow Kennedy on her journey of mates, love, friendship and fighting a mate bond she doesn’t want holding her back from her own goals and dreams.
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Ryker is a young, well-known, and feared Alpha of Dark Moon pack. He cares for his pack members through tough love and an iron fist. He's seen what happens when Alphas take their mate. It makes them weak and lose focus. Many have been corrupted by terrible mates. He would rather stay alone than be controlled.
Forced to marry her abusive ex-boyfriend, Jayden Warner, future Luna Anastasia Lasko has no choice but to flee from her home. With the help of her wolf and her magical ability, which she’s kept secret her entire life, she manages to stay on the run for three long years.
Everything changes on one fateful night when a horrible mistake leaves her in the clutches of the heartless Alpha Caius Blackwell.
Hatred and desire blossom between the two immediately, along with a connection deeper than either could have ever anticipated.
Despite their conflicted feelings, Anastasia and Alpha Caius realize they need one another.
All across the country werewolves with unique abilities are going missing, and Alpha Caius needs soldiers if he’s going to uncover the truth. All Anastasia wants is to step up as Luna to her pack, but she’s forbidden from doing so until she takes a husband.
The two come together and form a marriage contract that would make them husband and wife for three hundred and sixty-five days.
Lives and hearts are on the line, and nothing is what it seems.
Can both stay whole when secrets come to light and a mate-bond is thrown into the mix?
** Set in the same world as Alpha Nox! **
Rejected by the Alpha Heir, Mated to His Rival Brother
MidasPen
0
1.1K
Ciara had one job: secure her engagement to the Alpha's heir. She failed.
Rejected at the mating ball and left to freeze in the snow by her own father, she's saved by the last person she expected—Draven Stormclaw, the notorious bastard son everyone fears.
His price for her rescue? Marriage.
He claims he wants the scandal. A way to humiliate the brother who cast her aside. But the way he looks at her—the careful touches, the fierce protection, the warmth hidden beneath his cold reputation—tells a different story.
As Ciara is pulled deeper into Draven's dangerous world, she begins to suspect he's hiding something. That his reasons for saving her run far deeper than revenge.
But with her eighteenth birthday approaching—the day she'll finally sense her true mate—time is running out for secrets.
Because some bonds are written in the stars.
And some are forged in snow and desperation.
“Elion,” Brielle’s voice was soft but charged with intent as she stepped closer, her eyes locking onto his. “You keep telling me to stay away, but I see the way you look at me when you think no one’s watching.” She brushed a stray lock of hair from her face, her fingers lingering just a moment longer than necessary. “Maybe it’s time we stop pretending. Maybe it’s time we risk everything—for us.”
Elion’s breath hitched, torn between duty and desire. “Brielle, you’re so young… and I’m your Alpha, your guardian. Crossing this line could destroy everything.”
She smiled, a mixture of challenge and invitation. “Sometimes the greatest risks lead to the most unforgettable rewards. Don’t you want to see where this could go?”
=======
In the shadowed city of Silvercrest, eighteen-year-old Brielle Crest’s rare healing blood marks her as both a miracle and a target. Orphaned by a brutal attack that shattered her family, she is taken in by Elion Zaphiel, the formidable thirty-five-year-old Alpha of the powerful Zaphiel Pack—a man whose protection blurs the line between guardian and something dangerously more.
As political alliances tighten and rival packs close in, Brielle and Elion must navigate a forbidden love complicated by their seventeen-year age gap, defying tradition and igniting fierce jealousy within their ranks. With dark magic, deadly enemies, and their own haunted pasts threatening to tear them apart, can their bond survive and change their fate?
Choices And Desires- 5 Age-Gap MM Forbidden Romances
PAS
0
1.0K
5 Age-Gap MM Forbidden Romances-
Ever fantasize about a battle-hardened Alpha King spotting your scent in the shadows until you’re whimpering for his mark?
Feel the Lycan Daddy’s touch tracing your spine post-shift, growling how he’ll own you forever.
The Bratva CEO in the boardroom with you.
High-ranking professors rob secrets from trembling omegas.
Step-dads date their step-sons on midnight.
Rival Silver Fox Alphas collapsing decades of territory war into knotting ecstasy.
These Daddies devour minds, leaving you psychologically chained, leaking. Raw power imbalances. Psychological grooming into feral bliss.
Bellatrix Fallon has always hated Lycans, even becoming a wolf hunter at eighteen.
When a mysterious client offers her a job tied to her parents' strange deaths, she sees a chance for answers. Her mission: spy on the Winter Pack and its Alpha, Alec. It seems simple—until she starts falling for the broken Lycan.
As secrets unravel, Bellatrix learns shocking truths about herself and the Lycans, uncovering lies that shaped her life.
And then... the prophecy changes everything.
The real challenge is finding fics that go beyond 'Sirius the cool godfather' or 'Sirius the teen rebel.' So many stories slap him in a leather jacket and call it a day. I keep going back to 'The Debt of Time' by Shayalonnie—it's a beast of a fic, massive time travel with Hermione, but Sirius's arc from broken to rebuilt is honestly more compelling than most of the Romione stuff in it. He gets to be messy, angry, and has to actually work through the trauma of Azkaban, not just shake it off.
For something tighter, 'Innocent' by MarauderLover7 is a whole series starting with a young Sirius raising Harry from the start. It captures that chaotic, fiercely loyal Black family energy perfectly. You see the recklessness and the deep-seated need for a real home, which makes his later choices hit harder. Those are the ones that stick with me, where his youth feels like a real character trait, not just an aesthetic.
If you're hunting for Sirius Black content where he's actually young, I can't overstate how much I've come to rely on Archive of Our Own's filtering system. The Sirius Black-centric tags are a rabbit hole of their own, but sorting by 'Marauders Era' and then by kudos will usually surface the kind of pre-Azkaban character studies that feel authentic to that reckless, brilliant kid. You'll find a lot of Jily or Wolfstar stuff there too, obviously, but some authors have a real knack for zeroing in on Sirius's specific brand of trauma and rebellion before everything went wrong.
I've also had surprising luck on a couple of dedicated Potter forums that are a bit older-school in vibe. Places like FanFiction.net's 'Black Family' section can be hit-or-miss because the tagging is less precise, but there are some absolute classics buried there from the mid-2000s that focus heavily on his teenage years, often crossposted from live journals and such. The prose can be a bit dated sometimes, but the characterization often feels sharper, less influenced by later movie aesthetics. My bookmark folder for these is embarrassingly long.
You know, I’m always surprised by how many fics nail the 'aristocratic rebel' angle better than some canon-compliant stuff. There's this tension between the Black family legacy he's running from and the person he's trying to become at Hogwarts that gets explored in a million ways. Some writers really lean into the idea that his loud, reckless persona is a performance, a shield against the expectations he was raised with. You'll find fics where he's hyper-competent at pure-blood politics but uses it to sabotage his own family, or ones where the bravado cracks during the full moon when it's just him and Remus.
What I find more interesting, though, are the stories that tie his development to his relationship with space—both metaphorical and literal. Grimmauld Place is a prison, but so is his own name, his face that looks so much like his family's. A lot of authors have him constantly moving, running, flying, never stopping, because stopping means confronting what he's carrying. That restlessness defines him, and his character arc in fanfiction often becomes about learning when to stay, or who to stay for. Sometimes it's James, sometimes Remus, sometimes even Regulus. The best fics don't just make him 'the cool godfather'; they show the cost of building a new identity from scratch while haunted by the old one.