Headcanon FanFiction

Rhaenyra Targaryen NSFW Alphabet Challenge ⋆.ೃ࿔*:･

Rhaenyra Targaryen NSFW Alphabet Challenge ⋆.ೃ࿔*:･

F/F
G
Updated
11.04.2025
Fandom
House of the Dragon (TV) A Song of Ice and Fire - George R. R. Martin
Characters
Rhaenyra Targaryen & Jacaerys Velaryon, Jacaerys Velaryon, Rhaenyra Targaryen, Daemon Targaryen, Rhaenyra Targaryen/Original Female Character(s), Rhaenyra Targaryen & Original Female Character(s), Original Female Character(s), Rhaenyra Targaryen/You
Tags
Smut Rough Sex Oral Sex Vaginal Fingering Sex Toys Fluff and Smut Cunnilingus Headcanon Vaginal Sex Aftercare Squirting and Vaginal Ejaculation Lesbian Sex
small wlw rhaenyra one shots based off the alphabet challenge !!
Memories from Hogwarts

Memories from Hogwarts

F/F
M/M
G
Updated
13.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black/James Potter, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew, Lily Evans Potter, Mary Macdonald (Harry Potter), Marlene McKinnon
Tags
Fluff Modern Era Alternate Universe - Modern Setting Flirting Not Canon Compliant Humor Headcanon Friendship Hogwarts One Shot Alternate Universe - No Voldemort One Shot Collection
A collection of short, funny, *not depressing* one shots from the marauders' sixth and seventh years! It takes place in a modern day, no war/Voldemort AU. Basically just my favorite characters being silly and having fun together!!
Tom Marvolo Riddle Headcanons

Tom Marvolo Riddle Headcanons

F/M
G
Updated
13.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Tom Riddle, Harry Potter/Tom Riddle, Tom Riddle/Original Character(s), Tom Riddle & Reader, Tom Riddle/You
Tags
Other Additional Tags to Be Added Reader-Insert Headcanon Tags May Change Possessive Tom Riddle Obsessive Tom Riddle POV Tom Riddle
Some headcanons about prefect Tom Riddle and his quirks. I will update with Romantic ones and Nsfw laterrrr
Custard Cookies Ancient Adventures

Custard Cookies Ancient Adventures

F/F
G
Updated
11.04.2025
Fandom
Cookie Run (Video Game)
Characters
Golden Cheese Cookie/White Lily Cookie | Saint Lily Cookie, Dark Cacao Cookie (Cookie Run), Golden Cheese Cookie (Cookie Run), Custard Cookie III & Pure Vanilla Cookie (Cookie Run), Custard Cookie III (Cookie Run), Pure Vanilla Cookie (Cookie Run), White Lily Cookie | Saint Lily Cookie
Tags
Fluff Angst with a Happy Ending Hurt/Comfort Fluff and Humor Humor Established Relationship Headcanon Found Family Adoption Abandonment Adopted Children Child Abandonment
Custard Cookie gets adopted by Pure Vanilla , he now lives with the ancients
[N]SFW Headcanons

[N]SFW Headcanons

F/F
F/M
Gen
M/M
Multi
Other
G
Updated
11.04.2025
Fandom
Trolls (DreamWorks Movies) Trolls: TrollsTopia (Cartoon)
Characters
Branch (Trolls), Creek (Trolls), Poppy (Trolls), Bruce (Trolls), Queen Barb (Trolls), King Quincy (Trolls), Queen Essence (Trolls), John Dory (Trolls), Clay (Trolls), King Trollex, Rock Trolls (Trolls), Techno Trolls (Trolls),
Tags
Headcanon
Thoughts and Considerations about the Wizarding World

Thoughts and Considerations about the Wizarding World

G
Updated
13.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black, Harry Potter, Remus Lupin, Sirius Black, James Potter, Peter Pettigrew, Lily Evans Potter, Narcissa Black Malfoy, Bellatrix Black Lestrange, Walburga Black, Orion Black, Marauders (Harry Potter),
Tags
Alternate Universe - Canon Divergence Other Additional Tags to Be Added Headcanon First Wizarding War with Voldemort (Harry Potter) Pre-First Wizarding War with Voldemort (Harry Potter) Character Analysis Victorian Attitudes War with Grindelwald Tudor Era British Politics
When I reconnected with the Harry Potter saga, many questions arose in my head. Why is there economic inequality? Why do wizards celebrate Christmas? Were there members of the British royalty who were wizards? How does the government work, apart from...
The silent heartbreak

The silent heartbreak

F/F
G
Updated
11.04.2025
Fandom
僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
Characters
Midoriya Izuku, Midoriya Izuku/Uraraka Ochako, Toga Himiko, Uraraka Ochako, Toga Himiko/Uraraka Ochako
Tags
Angst Heavy Angst Headcanon Grief/Mourning Heartbreak POV First Person My First AO3 Post My First Fanfic Sorry Not Sorry
The thoughts of the days after the war,After the fight was over,When everything was safe and happy,Yet Uraraka couldn't find peace with her new perfect life because of what could have been between her and a certain villain that captured her heart.Ins...
Crimson in the House of Emerald Blood

Crimson in the House of Emerald Blood

F/M
M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Harry Potter, Minerva McGonagall, Severus Snape, Draco Malfoy/Harry Potter, Draco Malfoy, Ron Weasley, Hermione Granger, Lucius Malfoy, Albus Dumbledore, Blaise Zabini, Harry Potter/Ginny Weasley, Hermione Granger/Ron Weasley,
Tags
Self-Harm Headcanon Self-Worth Issues POV Draco Malfoy Draco Malfoy Needs a Hug Sassy Pansy Parkinson Gay Draco Malfoy Autistic Draco Malfoy Draco Malfoy & Pansy Parkinson Friendship Don't Try This At Home Past Draco Malfoy/Pansy Parkinson Marina coded
"I think I can tell the wrong sort for myself, thanks." The boy with the lightening scar looked at my hand with a kind of disgust I had never felt before.   I want to feel sick, I really do. The only thing I can feel, though, is the numbness of...
Warmth ~ . . . A Cloverdrizzle oneshot !!

Warmth ~ . . . A Cloverdrizzle oneshot !!

F/F
F/M
Gen
M/M
Multi
Other
G
Updated
11.04.2025
Fandom
Cookie Run (Video Game)
Characters
Clover Cookie/Choco Drizzle Cookie ( Cookie Run ), Clover Cookie (Cookie Run), Choco Drizzle Cookie (Cookie Run)
Tags
Implied/Referenced Self-Harm Established Relationship Idiots in Love Secret Relationship Headcanon First Kiss Nicknames Mild Hurt/Comfort Author Is Sleep Deprived Romantic Fluff Fluff and Hurt/Comfort The Author Regrets Nothing
Choco Drizzle Cookie never cared much for romance. After all, her missions from her master have always came first. She hid herself behind a cold, stoic demeanour, almost never cracking no matter the person. Cookies feared her for who she was, distanc...
HeadCanons from Overnight (they're from Percy Jackson, maybe I'll add some from other fandoms)

HeadCanons from Overnight (they're from Percy Jackson, maybe I'll add some from other fandoms)

F/F
F/M
Gen
M/M
Multi
G
Updated
11.04.2025
Fandom
Percy Jackson and the Olympians & Related Fandoms - All Media Types
Characters
Percy Jackson, I will add more people later
Tags
Headcanon
HeadCanons that come to me at night
Facing the truth

Facing the truth

F/F
F/M
G
Updated
11.04.2025
Fandom
Once Upon a Broken Heart Series - Stephanie Garber
Characters
Evangeline Fox/Jacks | Prince of Hearts, Chaos | Castor Valor/Ariel “LaLa” Lagrimas, Jacks | Prince of Hearts (Caraval Series), Evangeline Fox, Ariel "Lala" Lagrimas, Chaos | Castor Valor, Dane Valor, Wolfric Valor, Honora Valor
Tags
Smut Internal Conflict Sexual Content Pre-Canon Angst with a Happy Ending Emotional Hurt/Comfort Chaos Headcanon Character Study Flashbacks Slow Build Slow Burn Romance
This is a slow-burn story that starts with deep introspection and gradual developments. Please be patient as the story unfoldsSummary:Lala is happy with the happy ending of Jacks and her friend EvangelineShe is really happyBut When the deadly danger...
Mary Macdonalds Life

Mary Macdonalds Life

F/F
F/M
M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Regulus Black, Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, Lily Evans Potter, Mary Macdonald (Harry Potter), Marlene McKinnon, Dorcas Meadowes, Pandora Lovegood, Pandora Lovegood/Mary Macdonald
Tags
Angst Hurt/Comfort Headcanon Canon Compliant Everyone Is Gay Minor Marlene McKinnon/Dorcas Meadowes Minor James Potter/Lily Evans Potter Bisexual Mary Macdonald (Harry Potter) Obliviate | Memory Charm (Harry Potter) Bisexual Sirius Black Minor Sirius Black/Mary Macdonald Mary Macdonald-centric (Harry Potter)
Mary headcannon because I can’t stop thinking about her and she so overlooked in the fandom it physically hurts me <\3 Or My take on Mary’s life after sixth year!!! NOT FLESHED OUT !!!
Three Sentence Ficathon 2025 Fills

Three Sentence Ficathon 2025 Fills

F/F
F/M
Gen
M/M
Multi
G
Updated
11.04.2025
Fandom
Warhammer Fantasy Fate/Grand Order Warhammer 40k (Novels) - Various Authors
Characters
Original Don Quixote & Sancho (Limbus Company), Klara | Clara/Julia Luricheva | Yulia Lyuricheva, Grimm/Kuti (Black Souls), Grimm & Node (Black Souls), Don Quixote | Sancho/Sansón Carrasco(Limbus Company), My Unit | Byleth/Hubert von Vestra, Edelgard von Hresvelg/My Unit | Byleth/Hubert von Vestra, Roland/Angelica (Library of Ruina), Hermann/Ahab (Limbus Company), Lorgar Aurelian/Kor Phaeron, Edelgard von Hresvelg/Hubert von Vestra, Altria Caster | Caster & Morgan | Berserker,
Tags
Headcanon Rape/Non-con Elements Polyamory Drabble Collection Child Abuse Starvation Vomiting Backstory Cousin Incest 3 Sentence Ficathon 3 Sentence Fiction Run-On Sentences
Prompt fills for the 2025 3-sentence Ficathon.
Wand-erful Mischief

Wand-erful Mischief

F/F
F/M
M/M
G
Updated
11.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Harry Potter, Draco Malfoy/Harry Potter, Draco Malfoy, Ron Weasley, Hermione Granger, Hermione Granger/Draco Malfoy, Astoria Greengrass, Ginny Weasley, Harry Potter/Ginny Weasley, Hermione Granger/Ron Weasley, Pansy Parkinson, Astoria Greengrass/Draco Malfoy,
Tags
Headcanon
Its raining in the hogwarts cafeteria.... and theres no solution....watch what the Golden trio get up too....
The Beginning

The Beginning

F/F
F/M
M/M
Multi
G
Updated
11.04.2025
Fandom
鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime) 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga) Gacha Club (Video Game)
Characters
Tomioka Giyuu, Demon Slayer Corps Hashira | Pillars, Demon Slayer Corps Ensemble (Kimetsu no Yaiba), Kanroji Mitsuri, Kochou Shinobu, Kamado Nezuko, Shinazugawa Genya, Shinazugawa Sanemi, Iguro Obanai, Uzui Tengen, Rengoku Kyoujurou, Hashibira Inosuke,
Tags
Alternate Universe - Canon Divergence Friends to Lovers Other Additional Tags to Be Added Past Child Abuse Past Rape/Non-con Team as Family Headcanon Secret Identity Childhood Trauma Tags Contain Spoilers Childhood Friends Past Abuse
Yoko Fukushima dreams of following in her parents' footsteps to become a Hashira, but her journey is far from ordinary. Secretly a demon, Yoko faces overwhelming challenges as she struggles to reclaim her humanity and prove her worth. This is the sto...
Anna Lightwood NSFW Alphabet

Anna Lightwood NSFW Alphabet

F/F
G
Updated
11.04.2025
Fandom
The Shadowhunter Chronicles - Cassandra Clare The Last Hours Series - Cassandra Clare
Characters
Reader, Anna Lightwood/Reader, Anna Lightwood
Tags
Headcanon Lesbian Sex Canon Lesbian Character NSFW Alphabet Challenge AFAB!reader
Summary: NSFW alphabetical headcanon for my favorite lesbian, Anna Lightwoodpairing: Anna Lightwood x afab!readerwarnings: yn is implied to be AuDHD and non-binary, implied established relationshipa/n: written to take place after TLH
Sex, Drugs, Etc

Sex, Drugs, Etc

F/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, Lily Evans Potter, Evan Rosier, Barty Crouch Jr., Pandora Lovegood, James Potter/Reader, Regulus Black/Reader, Remus Lupin/Reader,
Tags
Fluff Friends to Lovers Magic Rough Sex Oral Sex Hurt/Comfort Reader-Insert Headcanon Vaginal Sex Orgasm Edging Arranged Marriage Marauders Era (Harry Potter)
Just one shots of your favorite marauders era guys
Feral

Feral

M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Sirius Black/Remus Lupin, Remus Lupin, Sirius Black, James Potter, Severus Snape, Evan Rosier, Pandora Lovegood, Mulciber Jr. | Severus Snape's Schoolmate, Avery Jr. | Severus Snape's Schoolmate, Mulciber Jr./Severus Snape
Tags
Fluff Idiots in Love Headcanon Jealousy Alternate Universe - Werewolf The Prank Cannon Divergence Oblivious Severus Suspicions Jealous Mulciber Smitten Mulciber Not That Oblivious
Después de una clase de pociones donde Remus Lupin y Severus Snape terminan como compañeros, Severus nota algo extraño en Lupin.Intrigado, empieza a ver más de cerca al Gryffindor, encontrando una gran línea de detalles que no había notado hasta ese...
the bronze trio

the bronze trio

F/M
M/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling Percy Jackson and the Olympians - Rick Riordan
Characters
Harry Potter, Severus Snape, Draco Malfoy, Ron Weasley, Hermione Granger, Ginny Weasley, Neville Longbottom, Albus Dumbledore, Harry Potter/Ginny Weasley, Luna Lovegood, Hermione Granger/Ron Weasley, Hermione Granger & Harry Potter & Ron Weasley,
Tags
Headcanon Light Angst Out of Character Alternate Universe POV Multiple My First AO3 Post OOC Golden Trio | Hermione Granger & Harry Potter & Ron Weasley Friendship Nico di Angelo/Will Solace Fluff Hogwarts Eighth Year No Beta read we die like men aroace leo
Nico can’t escape the wild life as a demigod.The quest is the protection of the wizarding world that still has much corruption. He has to not only do that but also has to get good grades in his classes.but at least he isn't alone though his boyfriend...
Here For You

Here For You

F/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling
Characters
Harry Potter, Draco Malfoy, Ron Weasley, Hermione Granger, Hermione Granger/Draco Malfoy, Narcissa Black Malfoy, Voldemort (Harry Potter)
Tags
Fluff Fluff and Angst Headcanon Hogwarts Romantic Fluff dramione - Freeform Oneshot Draco Malfoy Needs a Hug Post-Battle of Hogwarts Hogwarts Inter-House Friendships Pining Draco Malfoy Hogwarts Eighth Year
Hermione Granger follows a hunch... and a blond broken boy who needs some love.