Protective Sibling Sirius Black FanFiction

as traditions dictate

as traditions dictate

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Sirius Black, James Potter, Lucius Malfoy, Narcissa Black Malfoy, Albus Dumbledore, Regulus Black & Sirius Black, Evan Rosier, Lucius Malfoy/Narcissa Black Malfoy, Barty Crouch Jr., Walburga Black,
Tags
canon-divergence Alpha/Beta/Omega Dynamics Light BDSM Arranged Marriage Alpha James Potter Alpha Sirius Black Pureblood Culture (Harry Potter) Bad Parent Walburga Black Period-Typical Sexism Regulus Black Needs a Hug Sirius Black & James Potter Friendship Domestic Discipline
Regulus Black was born as the only Omega child to Walburga and Orion Black. As per tradition, he belonged to the Alpha James Potter.This arrangement was part of an age-old pact between three of the most prominent pureblood families—Malfoy, Black, and...
Nightmare

Nightmare

G
Updated
13.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black, Remus Lupin, Sirius Black, Regulus Black & Sirius Black, Walburga Black, Orion Black
Tags
Siblings Angst with a Happy Ending Hurt/Comfort Fluff and Angst Hogwarts Regulus Black & Sirius Black Have a Good Relationship Regulus Black Needs a Hug Protective Sirius Black Good Regulus Black Protective Sibling Sirius Black Young Sirius Black Regulus Black Feels
Regulus has a nightmare, and he looks for his older brother for comfort even though it’s the middle of the night and he shouldn’t be outside his dorm and even though he and Sirius haven’t spoken properly in months.
Behind The Cameras

Behind The Cameras

F/F
M/M
G
Updated
11.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew, Lily Evans Potter, Mary Macdonald (Harry Potter), Marlene McKinnon, Dorcas Meadowes, Marlene McKinnon/Dorcas Meadowes,
Tags
Slow Burn Sibling Rivalry There Was Only One Bed Fluff and Angst Band Fic Marauders Era (Harry Potter) Alternate Universe - Muggle Pandora Lovegood and Evan Rosier are Twins Established Barty Crouch Jr./Evan Rosier Endgame Regulus Black/James Potter Protective Sibling Sirius Black Remus Lupin Has a Sibling
“Three bands, one special event, and enough drama to fill a stadium.”The Marauders and The Emerald have long been bitter rivals in the music scene, competing for fame, glory, and the occasional throats of one another. But when they’re forced to work...
When Spying Goes Terribly Wrong

When Spying Goes Terribly Wrong

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew
Tags
Secret Relationship Alpha/Beta/Omega Dynamics Alpha/Omega Alternate Universe Alpha James Potter Alpha Sirius Black Protective Sirius Black Accidental Voyeurism Minor Sirius Black/Remus Lupin Protective Sibling Sirius Black Omega Remus Lupin Caught
James has been acting suspicious as fuck and Sirius needs to get to the bottom of it. Luckily, there's a potion that will let Sirius and the others spy on James... how could it possibly go wrong?
Anything For You

Anything For You

Gen
M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, James Potter, Regulus Black & Sirius Black
Tags
Depression Brotherly Love Angst with a Happy Ending Hurt/Comfort Post-Traumatic Stress Disorder - PTSD Self-Esteem Issues Platonic Cuddling Panic Attacks Rape Recovery Regulus Black and Sirius Black Angst Regulus Black Needs a Hug Sirius Black & James Potter Friendship
Believing Regulus sold him out again, Sirius says some hurtful things and pushes his brother away. With the advent of Lucius Malfoy's visit to the Black family after years, this is a bad time for a rift between the brothers.In hindsight Sirius wishes...
You Surrounded Me & My Windows Are Breaking

You Surrounded Me & My Windows Are Breaking

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Severus Snape, Regulus Black & Sirius Black, Walburga Black, Orion Black
Tags
Choking Angst with a Happy Ending Emotional Hurt/Comfort Angst and Hurt/Comfort Fluff and Angst Implied/Referenced Child Abuse Homophobia Panic Attacks Regulus Black-centric Regulus Black & Sirius Black Have a Good Relationship Alternate Universe - Modern with Magic Sirius Black & James Potter Friendship
Regulus and James' relationship is outed to Regulus' parents and he finds himself running away from home just as Sirius had a few years before. He starts to regret it when he realizes that if his parents have no heir, they will stop at nothing to get...
Back together

Back together

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew, Regulus Black & Sirius Black, Barty Crouch Jr., Sirius Black & Remus Lupin & Peter Pettigrew & James Potter, Regulus Black & Barty Crouch Jr.
Tags
Mutual Pining Light Angst Pining Kissing Happy Ending Boys Kissing Post-Break Up Cute Getting Back Together Barty Crouch Jr. is a Little Shit Funny James Potter Loves Regulus Black
James and Regulus broke up, but even after months Regulus can't get over him.
helpless

helpless

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Remus Lupin, Sirius Black, James Potter, Regulus Black & Sirius Black, Sirius Black & James Potter, Walburga Black, Orion Black, Orion Black/Walburga Black
Tags
Regulus Black & Sirius Black Have a Good Relationship Royalty Pansexual James Potter Gay Regulus Black Sirius Black & James Potter Friendship POV Regulus Black Protective Sibling Sirius Black a royal ball Royal Black Family Sirius is a prince Regulus is a prince james is a prince
The royal Black family hosts a winter's ball.
The deal

The deal

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Sirius Black, James Potter, Regulus Black & Sirius Black, Sirius Black & James Potter
Tags
Fluff Fluff and Humor Idiots in Love First Kiss Kissing Boys Kissing Regulus Black & Sirius Black Have a Good Relationship Cute Regulus Black is a Little Shit Funny Young James Potter Public Display of Affection
James Potter decides to make a deal with Regulus Black. If he wins he gets what he wants if Regulus wins he can do with him what he wants.In other words: Regulus and James make a deal that the other gets something if they win.
i know i shouldn’t fall for you (but i can’t help it)

i know i shouldn’t fall for you (but i can’t help it)

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew, Lily Evans Potter
Tags
Fluff Alternate Universe - Canon Divergence Other Additional Tags to Be Added Getting Together Alpha/Beta/Omega Dynamics Mating Cycles/In Heat Pining Alpha/Omega Alternate Universe Marauders Era (Harry Potter) Regulus Black & Sirius Black Have a Good Relationship Alternate Universe - No Voldemort
As Regulus' first heat slowly approaches, Sirius gets more and more worried. James promises to help Sirius protect his brother, but what happens when James is the one to find Regulus in full-blown heat? And why does James start feeling strange tugs a...
Little Padfoot

Little Padfoot

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew, Regulus Black & Sirius Black
Tags
Fluff Depression Suicidal Thoughts Sibling Bonding Hurt/Comfort Self-Harm Period-Typical Homophobia Enemies to Lovers Happy Ending Marauders Era (Harry Potter) Alternate Universe - No Voldemort Regulus Black and Sirius Black Angst
A potion gone wrong results in Sirius being turned into his five year old self, and the marauders have to look after him until Slughorn brews an antidote. The only issue is that he wants his estranged brother Regulus helping too, because he's five an...
you used to tell me i was brave

you used to tell me i was brave

G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black, Sirius Black
Tags
Heavy Angst Implied/Referenced Child Abuse Canon Compliant Epistolary No beta we die like regulus Protective Sibling Sirius Black sibling angst
A collection of brief letters Sirius writes his brother after escaping to the Potters.
How soon is now?

How soon is now?

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew
Tags
Fluff Getting Together Falling In Love Light Angst I Can't Believe I Wrote This Human/Vampire Relationship Alternate Universe - No Voldemort Established Sirius Black/Remus Lupin Sad Regulus Black Protective Sibling Sirius Black Vampire Regulus Black Shy Regulus Black
The last thing James was expecting to happen after Sirius ran away, was to have his secret vampire brother Regulus show up asking for refuge too.---No Voldemort AU
Helpless Against The Tide

Helpless Against The Tide

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Tom Riddle | Voldemort, Albus Dumbledore, Regulus Black & Sirius Black, Kreacher (Harry Potter)
Tags
Angst with a Happy Ending Angst and Hurt/Comfort Implied/Referenced Child Abuse Drowning Caretaking First Wizarding War with Voldemort (Harry Potter) Horcruxes Regulus Black-centric Regulus Black & Sirius Black Have a Good Relationship Forehead Kisses Regulus Black Needs a Hug Abusive Walburga Black
Regulus Black is a spy for the Order. He discovers Voldy's horcrux and goes to the cave with Kreacher in tow, nearly dying in the process, forcing Kreacher to get a little help from his boyfriend and big brother.
Family Line

Family Line

M/M
G
Updated
15.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Tom Riddle | Voldemort, Regulus Black & Sirius Black, Evan Rosier, Bellatrix Black Lestrange, Euphemia Potter, Fleamont Potter,
Tags
Blood and Injury Angst with a Happy Ending Angst and Hurt/Comfort Caretaking Pre-First Wizarding War with Voldemort (Harry Potter) Regulus Black & Sirius Black Have a Good Relationship Regulus Black and Sirius Black Angst Established Sirius Black/Remus Lupin Regulus Black and Sirius Black Both Run Away Abusive Walburga Black Regulus Black Speaks French The Noble and Most Ancient House of Black
The night Sirius and Regulus run away is the same night Sirius refuses to swear his allegiance to Voldy, and Regulus fights back for the first time in defense of his brother. Enjoy the angst, I promise there will be comfort too :)A Black brothers run...
there are some things that no one teaches you, love (that god in his awful wisdom first programs in)

there are some things that no one teaches you, love (that god in his awful wisdom first programs in)

M/M
Multi
G
Updated
15.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black, Sirius Black/Remus Lupin, James Potter/Lily Evans Potter, Remus Lupin, Sirius Black, James Potter, Mary Macdonald (Harry Potter), Marlene McKinnon, Severus Snape, Dorcas Meadowes, Marlene McKinnon/Dorcas Meadowes, Regulus Black & Sirius Black,
Tags
Alternate Universe - Modern Setting Suicidal Thoughts Self-Esteem Issues Implied/Referenced Self-Harm Implied/Referenced Child Abuse Implied/Referenced Rape/Non-con Alternate Universe - Muggle Regulus Black & Sirius Black Have a Good Relationship Trans Regulus Black Bad Parent Walburga Black Regulus Black Needs a Hug Protective Sirius Black
Regulus and Sirius had both hoped that things would get better once he was finally away from their parents. Away from them and their toxicity, choking the life out of him with every breath he took.It was a hard punch in the gut when they realized tha...
A Little Star

A Little Star

F/F
F/M
M/M
G
Updated
15.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew, Lily Evans Potter, Dorcas Meadowes, Marlene McKinnon/Dorcas Meadowes, Regulus Black & Sirius Black, Evan Rosier, Barty Crouch Jr.,
Tags
Angst Angst with a Happy Ending Self-Esteem Issues Implied/Referenced Self-Harm Fluff and Angst Bullying Physical Abuse Marauders Era (Harry Potter) Bisexual Remus Lupin Gay Sirius Black Marauders Friendship (Harry Potter) Slytherin
All his life he was just trying to protect himself and his little brother. in the end he just made everything worse. for his boyfriend and his friends.but under all that cheerful and happy demeanor is a little boy who needed his mother.after the pran...
Let's hope it will last forever

Let's hope it will last forever

M/M
G
Updated
15.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Sirius Black/Remus Lupin, Regulus Black & Sirius Black, Sirius Black & James Potter, Regulus Black & Barty Crouch Jr. & Pandora Lovegood & Dorcas Meadowes & Evan Rosier, Sirius Black & Marlene McKinnon
Tags
Fluff Brotherly Love Getting Together Fluff and Humor Idiots in Love Falling In Love Boys In Love Comfort No Hurt Marauders Friendship (Harry Potter) Teenage Drama Regulus Black & Sirius Black Have a Good Relationship Alternate Universe - High School
"I'm not mad at him and I don't dislike him, in fact–" now or never, right? "Sirius, I think I like him a little too much actually," it's quiet. "What?" Sirius stares at him blinking, it's not happening, Sirius doesn't believe it. "Nothing,...
I love you big brother

I love you big brother

G
Updated
15.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black, Sirius Black, Regulus Black & Sirius Black
Tags
Brotherly Love Regulus Black-centric Regulus Black & Sirius Black Have a Good Relationship Pureblood Culture (Harry Potter) Regulus Black Needs a Hug Good Regulus Black Quidditch Brotherly Bonding Protective Sibling Sirius Black Young Sirius Black Overprotective Sirius Black Young Regulus Black
At a pureblood gathering in Black Manor, five-year-old Regulus Black faced mockery from other older pureblood children.But his older brother, Sirius, defends him, confronting the bullies.A story about the brotherly love between Regulus and sirius bec...
Anything But Lovers (History Hates Lovers)

Anything But Lovers (History Hates Lovers)

M/M
G
Updated
17.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Harry Potter, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Regulus Black & Sirius Black
Tags
Modern Era Past Child Abuse Fluff and Angst Attempt at Humor Implied/Referenced Child Abuse Alternate Universe - Muggle Regulus Black and Sirius Black Angst Sirius Black & James Potter Friendship Love at First Sight Regulus Black Deserves Better Remus Lupin is a Little Shit no
Walburga Black is dead, and Sirius and Regulus are slowly, painstakingly trying to piece their relationship back together. Sirius just wants Regulus to meet his new family, to have a place with them.Regulus really wasn't prepared to meet James Potter...