Regulus Black and Sirius Black Have a Sister FanFiction

Mihi Alterna Futura Sui | My Alternate Future

Mihi Alterna Futura Sui | My Alternate Future

F/F
M/M
Other
G
Updated
11.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Original Female Character(s), Harry Potter, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Mary Macdonald (Harry Potter), Marlene McKinnon, Dorcas Meadowes, Marlene McKinnon/Dorcas Meadowes,
Tags
Light Angst I'm Bad At Tagging Everyone Is Gay Alternate Universe - No Voldemort Pansexual James Potter Bad Parent Walburga Black Gay Regulus Black Gay Remus Lupin Gay Evan Rosier Singer Sirius Black Pandora Lovegood and Evan Rosier are Siblings Pandora Lovegood is a Rosier
3 people are chosen to show their alternate future. Who will it be? What will be shown? Will it bring people together or tear them apart?Or Lily James and Regulus are chosen to show a future of their alternate selves and will finally realize that the...
Don’t Paint me Black

Don’t Paint me Black

F/F
F/M
M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Original Characters, Harry Potter, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, Severus Snape, Ron Weasley, Hermione Granger, Neville Longbottom, Original Female Character(s)/Original Female Character(s), Hermione Granger/Ron Weasley, Original Female Character(s)/Original Male Character(s),
Tags
Other Additional Tags to Be Added Child Abuse Kinda Aged-Up Character(s) Sirius Black Lives Regulus Black and Sirius Black Angst Bad Parent Walburga Black Protective Sirius Black Triwizard Tournament (Harry Potter) Hogwarts Era Good Severus Snape Regulus Black and Sirius Black Have a Sister
When Sirius Black's younger sister, Cassiopeia meets a young girl in the woods by her house, she comes to the realisation that all her parents say may not be true.
Estelle Black

Estelle Black

F/F
F/M
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, Mary Macdonald (Harry Potter), Severus Snape, Dorcas Meadowes, Tom Riddle | Voldemort,
Tags
Alternate Universe - Canon Divergence Angst with a Happy Ending Arranged Marriage Albus Dumbledore Bashing Regulus Black Lives Pandora Lovegood and Evan Rosier are Twins Seer Pandora Lovegood Regulus Black and Sirius Black Angst Horcrux Hunting Parselmouths & Parseltongue (Harry Potter) POV Regulus Black Animagus Regulus Black
What happens when there is a long lost Black Sister who got shipped of to Beauxbatons comes back and starts family therapy with the Black brothers. Focused on mending the broken relationship.What happens when she was raised by her grandmother instead...
Brothers

Brothers

F/F
F/M
M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black, Harry Potter, Sirius Black/Remus Lupin, James Potter/Lily Evans Potter, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew, Lily Evans Potter, Mary Macdonald (Harry Potter), Marlene McKinnon, Dorcas Meadowes,
Tags
Angst Implied/Referenced Suicide Suicide Attempt Trauma Mental Health Issues Marauders Era (Harry Potter) Bisexual Remus Lupin Gay Sirius Black Lesbian Marlene McKinnon Alternate Universe - Muggle Regulus Black & Sirius Black Have a Good Relationship Alternate Universe - No Voldemort
During the summer of 1966, Sirius and Regulus Black, aged 6 and 5, escape from their family home in France and hide in the forest. They lived there alone for six years before being found. This fact, which they kept secret from their friends and new f...
smells like teen spirit (and lost dreams)

smells like teen spirit (and lost dreams)

Multi
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Regulus Black, Original Female Character(s), Original Male Character(s), Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew, Lily Evans Potter, Mary Macdonald (Harry Potter), Marlene McKinnon,
Tags
Modern Era Flirting Texting Alcohol Karaoke Kinda Trans Regulus Black Funny I Wrote This While Listening to Hozier's Music Drugs mentions of abuse obv
whysosirius? added moonagedaydream, jame, and penispettigrew.whysosirius? changed the name to “The Marauders!!” moonagedaydream: why.
it hits different this time.

it hits different this time.

F/F
F/M
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, Mary Macdonald (Harry Potter), Marlene McKinnon, Severus Snape, Dorcas Meadowes, Narcissa Black Malfoy, Alice Longbottom,
Tags
Regulus Black & Sirius Black Have a Good Relationship Bisexual Character Minor Marlene McKinnon/Dorcas Meadowes Pansexual James Potter POV Original Female Character Minor Mary Macdonald/Lily Evans Potter Regulus Black and Sirius Black Have a Sister Minor Barty Crouch Jr./Evan Rosier Queer Pandora Lovegood Minor Pandora Lovegood/Original Female Character Non-Binary Amelia Bones gender fluid sirius black
Elara's a crazy bitch, Sirius is dramatic as fuck, Regulus needs a hug, and they all need therapy.orThe Black siblings go to Hogwarts Academy and meet their respective partners
A forbidden attachment: A Black and a Lupin

A forbidden attachment: A Black and a Lupin

F/M
Multi
Other
G
Updated
15.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Original Female Character(s), Original Male Character(s), James Potter/Lily Evans Potter, Sirius Black, James Potter, Lily Evans Potter, Marlene McKinnon, Dorcas Meadowes, Remus Lupin/Original Female Character(s), Hogwarts Staff, Sirius Black/Marlene McKinnon, Hogwarts Students,
Tags
Everyone Needs A Hug Marauders Era (Harry Potter) First Wizarding War with Voldemort (Harry Potter) Remus Lupin & Lily Evans Potter Friendship Sirius Black & James Potter Friendship BAMF Lily Evans Potter Dysfunctional Black Family (Harry Potter) Protective Remus Lupin Good Parent Euphemia Potter Good Parent Fleamont Potter Asexual Peter Pettigrew Marlene McKinnon & Peter Pettigrew & James Potter are Childhood Friends
Cassiopeia Black, the twin sister of Sirius Black, enters the world of Hogwarts as a pureblood from the House of Black, a house that strongly upholds the idea of blood purity and maintaining a respectable pureblood line. Being raised with these views...
Please Let Me In

Please Let Me In

G
Updated
19.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Original Female Character(s), Sirius Black, Sirius Black & Original Female Character(s)
Tags
Sirius Black Free from Azkaban Sirius Black Needs a Hug Regulus Black and Sirius Black Have a Sister
Sirius breaks out of Azkaban, goes to his sister. I wrote this a while ago, figured why not post it. Regulus' twin, Cassie. The dialogue is based off one of the scenes from Punisher.