A prompt-based fandom event aiming to focus on celebrating Finwë's children: Fëanor, Findis, Fingolfin, Lalwen, & Finarfin - ships, gen relationships, or character-centric, we love to see them all.
2026 schedule:
Prompting: September 1st-14th
Publishing of prompt list: September 19th (at latest)
Claiming Begins: September 21st at 18:00 UTC
Works due: November 20th
Posting starts: November 27th
Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.
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Hey all, we are going to be back this year! Please see the schedule below <3
2026 schedule:
Prompting: September 1st-14th
Publishing of prompt list: September 19th (at latest)
Claiming Begins: September 21st at 18:00 UTC
Works due: November 20th
Posting starts: November 27th
Full Rules & Requirements can be found here: Desktop | Mobile
And that's a wrap y'all, all the works have been revealed! A huge thanks for our wonderful writers and artists, betas and cheerleaders, and of course, our readers, for making this a fantastic first year of the fest!
The full AO3 collection can be found >>here<<, and of course, all the works are below the cut! Happy reading and don't forget to leave some love for the creators!
cheers,
the mods <3
Title: On the Nature of Princes
AO3 username: Nerdanelparmandil | @nerdanelparmandil
Rating: Gen
Warnings: No warnings apply
Pairing/main characters: Fingolfin, Feanor, Maedhros
Medium/Word Count: fanfiction, 6000 words
Summary:
Maitimo grows up in a royal household, with duties and expectations that weigh heavy on his shoulders. Two are the people he can look up to. On the one hand, his father, the Crown Prince, unreachable and hard to please. On the other, the high Prince Nolofinwe, paragon of virtue, dexterous at court - the man his father hates the most.
A look at the relationship between the two sons of Finwe, from the perspective of one who has found himself in the middle of their strife, at first by chance and then by choice.
Title: A History of Duels
AO3 username: LeetheVix | @antlered-vixen
Rating: M
Warnings: Choose not to apply
Pairing/main characters: Feanor/Fingolfin
Medium/Word Count: 12.641
Summary:
ĂolofinwĂ« needs to win, if just once.
He chases and despises, he yearns for and resents, he fights and fights and fights.
Then, he wins.
Or might have, if FĂ«anĂĄro was something to be won.
Title: Well I wonder if it's wise//To hold you like I've wanted to before AO3 username: Tar-Eleniel | @alanastarveil
Rating: Explicit
Warnings: Incest, sibling incest M/M/M/F/F, anal sex, oral sex, vaginal sex
Pairing/main characters: Feanor/Fingolfin/Findis/Finarfin/Lalwen Medium/Word Count: 3,802
Summary:
In the Fourth Age of Arda, Findis, Finarfin, Lalwen, and Fingolfin have resumed the relationship they had before the Darkening; after Fingon and Maedhros' wedding, they decide it's time to finally get up the courage to see if they can get Feanor to join them, as they have wanted to for literal ages.
đŹ 0  đ 17  â€ïž 45 · Created for the @finweansiblingfest!
Is FĂ«anor actually speaking ill of Fingolfin? Of course not! Finarfin would not eng
----------------
Title: Your Fire Burns Me; Keeps Me Warm
Ao3 name: CaughtInFicHell | @comeontakemyname
Rating: T+
Pairing/main characters: FĂ«anor/Fingolfin
Warnings: Half-Sibling Incest
Medium/word count: fic, 7547 words
Summary:
When the duel with Morgoth ends differently, Fingolfin is saved at the last minute by his brother, as what is left of FĂ«anor escapes one of the Silmarilli. The aftermath becomes a complicated knot of feelings as, for the first time in centuries, the brothers have to face each other.
Title: The Daughters of Finwë
AO3 username: gerardway | @fatbishonen
Rating: ExplicitÂ
Warnings: Creator chose not to use archive warnings
Pairing/main characters: Findis/Lalwen
Medium/Word Count: 5505
Summary:
For the Finwean Sibling Fest. Prompt number 69, "This is a general nasty angsty sister femslash incest prompt. Does Findis feel wracked with religious guilt? Is she using Lalwen as a substitute for someone even more forbidden, unspeakable even? Make it upsetting and dark as you like."
Title: Love and Study
AO3 username: StarShadeEmily | @starshadeemilyart
Rating: E
Warnings: Underage, Incest
Pairing/main characters: Feanor/Irime Lalwen
Medium/Word Count: 11,733
Summary:
Feanor tutors Lalwen in the ways of love. After a painful first time, Lalwen goes to Feanor for sex advice, which quickly leads to him having sex with her to demonstrate how to do it correctly. Of course, because heâs Feanor, he takes notes and gives her a report card.
Meanwhile, Lalwenâs relationship with her new boytoy is blossoming, and they research a way to have sex without being married. Of course, being Lalwen, she strings him along and plays with his heart, and makes him listen to her talk about frogs and her fanfiction for hours. A skillful lover should never be too easy.
The Feanor/Lalwen/Fingolfin psychosexual triad intensifies.
Lalwen explores what it means to be a sexual being in a repressive society.
Title: Chromatic Dispersion and Other Blessings
AO3 username: Loriache | @loriache
Rating: G
Warnings: No Archive Warnings Apply
Pairing/main characters: Fëanor & Maedhros (Tolkien), Fëanor & Finwë (Tolkien), Fëanor (Tolkien), Finwë (Tolkien), Maedhros (Tolkien)
Medium/Word Count:Â 6,436
Summary:Â
In the hall of Formenos, the messenger, solemn of mien, conveyed Lord Irmo and Lord Manweâs heartfelt wish that Feanaro visit Lorien to heal the wounds Melkor had wrought upon him. Feanaro may be very much unwilling, but the alternative requires introspection which will hurt, heal, and ultimately change more than just his perspective.
Prompt: Someone encourages Feanor to keep a gratitude journal to get a better perspective on his life. Could take place in any time period (Years of the Trees? while on the Flight? in Mandos? after re-embodiment?). Could go comic or angsty, or both!
Title: for these who die as cattle
AO3 username: timelessutterances | @balrogballs
Rating: M
Warnings: Sibling Incest
Pairing/main characters: FĂ«anor/Finarfin
Medium/Word Count: 3,955
Summary:
"So perhaps I love you not as a brother should love a brother, or perhaps exactly as a brother could have, with all the complication and contradiction that entails. I love your brilliance and your cruelty, your certainty and your blindness. I love the way you and Lalwendë moved through the world as if it owed you glory as your birthright, any compromise a defeat. I loved you all, and I resented you."
A series of letters to the departed and exiled FĂ«anor, in whose absence Finarfin's long-held fixation with his oldest brother comes to the surface, and mingles uneasily with his sorrow at the loss of his siblings and his children
Title: like a moth to the flame
AO3 username: luthnethril (ravenditefairylights) | @luthnethril
Rating: General Audiences
Warnings: No Archive Warnings Apply
Pairing/main characters: FĂ«anor & Finarfin & Findis & Fingolfin & ĂrimĂ« | Lalwen (Tolkien), AnairĂ«/Fingonlfin (Tolkien)
Medium/Word Count: 5.6k
Summary:
ĂolofinwĂ« is into his third glass of wine when disaster strikes.
The smile stays on FĂ«anĂĄroâs face even as his eyes pass over his siblings âeven as he addresses ĂolofinwĂ« directly, looking steadily into his eyes with that expectation of a response that always forces ĂolofinwĂ« into answer, no matter whether or not heâs gathered his words.
Since Lalwen was young, her sister Findis has dreamt of becoming a handmaiden of Varda and to dwell on Taniquetil, removed from the world and her troublesome family. But when that dream clashes with Lalwen's desire for her sister, which will win out?
Title: this is the dirty eden
AO3 username: atlantablack | @atlantablack
Rating: explicit
Warnings: no archive warnings apply
Pairing/main characters: FĂ«anor/Fingolfin
Medium/Word Count: 5,587
Summary:
âYou know as well as I do that the aphrodisiac is never meant to be consumed in such a high quantity,â ĂolofinwĂ« says evenly. âIt is well known to be lethal in such a high dosage if there is no one around to lay with.âÂ
FĂ«anĂĄro shoots him a scathing glare, as if ĂolofinwĂ« has said something incomparably stupid. âI am well aware of the properties of the plant,â FĂ«anĂĄro says flatly, shrugging his jacket off and glaring at the pollen on it. âBut I am not alone, am I?âÂ
It takes a moment for FĂ«anĂĄro's meaning to hit him, and he does not quite stop himself from gaping when it does. "We cannot lay together!" he exclaims, voice going humiliating high with horror. "You are my brother!"
The words earn him nothing but a disparaging snort; FĂ«anĂĄro only half paying him any attention at all as he glances around the clearing. "You are not my brother," he says, and the words are not even cruel, only a simple fact. "I am not going to die because of your useless morals."
âCan I not what?â he asks, at last. âWhat do you want me to say, Nolvoâoh no, brother, please do not wed, so that we may continue our ill-advised perversion behind closed doors? Do you want me to fuck you slow and gentle, tell you that it has always been you? That I will ruin your wedding and leave my wife, so we may run away to live lifeââ NolofinwĂ« reverses their positions with such force that FĂ«anĂĄro is slammed into the wood panelling, all air punched out of his lungs. This is more like it; this is how they began, what they know; what is, in the end, all they ever ought to be to each otherâNolofinwĂ«âs features contorted in fury and hurt, FĂ«anĂĄro baring his teeth like he is just waiting to cause more of the same. They stay there for a moment, both breathing harshly, a precipice that is only waiting for them to fall. â FĂ«anor, Fingolfin, and their last night before Fingolfin is to be wed.
And that's a wrap on week 2! We had a fantastic week of works, all of which can be found below the cut - we encourage you to go leave the creators some love <3
A full round-up list will go up tomorrow so you can catch any works you might have missed!
Title: Chromatic Dispersion and Other Blessings
AO3 username: Loriache | @loriache
Rating: G
Warnings: No Archive Warnings Apply
Pairing/main characters: Fëanor & Maedhros (Tolkien), Fëanor & Finwë (Tolkien), Fëanor (Tolkien), Finwë (Tolkien), Maedhros (Tolkien)
Medium/Word Count:Â 6,436
Summary:Â
In the hall of Formenos, the messenger, solemn of mien, conveyed Lord Irmo and Lord Manweâs heartfelt wish that Feanaro visit Lorien to heal the wounds Melkor had wrought upon him. Feanaro may be very much unwilling, but the alternative requires introspection which will hurt, heal, and ultimately change more than just his perspective. Prompt: Someone encourages Feanor to keep a gratitude journal to get a better perspective on his life. Could take place in any time period (Years of the Trees? while on the Flight? in Mandos? after re-embodiment?). Could go comic or angsty, or both!
Title: for these who die as cattle
AO3 username: timelessutterances | @balrogballs
Rating: M
Warnings: Sibling Incest
Pairing/main characters: FĂ«anor/Finarfin
Medium/Word Count: 3,955
Summary:
"So perhaps I love you not as a brother should love a brother, or perhaps exactly as a brother could have, with all the complication and contradiction that entails. I love your brilliance and your cruelty, your certainty and your blindness. I love the way you and Lalwendë moved through the world as if it owed you glory as your birthright, any compromise a defeat. I loved you all, and I resented you."
A series of letters to the departed and exiled FĂ«anor, in whose absence Finarfin's long-held fixation with his oldest brother comes to the surface, and mingles uneasily with his sorrow at the loss of his siblings and his children
Title: like a moth to the flame
AO3 username: luthnethril (ravenditefairylights) | @luthnethril
Rating: General Audiences
Warnings: No Archive Warnings Apply
Pairing/main characters: FĂ«anor & Finarfin & Findis & Fingolfin & ĂrimĂ« | Lalwen (Tolkien), AnairĂ«/Fingonlfin (Tolkien)
Medium/Word Count: 5.6k
Summary:
ĂolofinwĂ« is into his third glass of wine when disaster strikes. The smile stays on FĂ«anĂĄroâs face even as his eyes pass over his siblings âeven as he addresses ĂolofinwĂ« directly, looking steadily into his eyes with that expectation of a response that always forces ĂolofinwĂ« into answer, no matter whether or not heâs gathered his words.
Since Lalwen was young, her sister Findis has dreamt of becoming a handmaiden of Varda and to dwell on Taniquetil, removed from the world and her troublesome family. But when that dream clashes with Lalwen's desire for her sister, which will win out?
Title: this is the dirty eden
AO3 username: atlantablack | @atlantablack
Rating: explicit
Warnings: no archive warnings apply
Pairing/main characters: FĂ«anor/Fingolfin
Medium/Word Count: 5,587
Summary:
âYou know as well as I do that the aphrodisiac is never meant to be consumed in such a high quantity,â ĂolofinwĂ« says evenly. âIt is well known to be lethal in such a high dosage if there is no one around to lay with.âÂ
FĂ«anĂĄro shoots him a scathing glare, as if ĂolofinwĂ« has said something incomparably stupid. âI am well aware of the properties of the plant,â FĂ«anĂĄro says flatly, shrugging his jacket off and glaring at the pollen on it. âBut I am not alone, am I?âÂ
It takes a moment for FĂ«anĂĄro's meaning to hit him, and he does not quite stop himself from gaping when it does. "We cannot lay together!" he exclaims, voice going humiliating high with horror. "You are my brother!"
The words earn him nothing but a disparaging snort; FĂ«anĂĄro only half paying him any attention at all as he glances around the clearing. "You are not my brother," he says, and the words are not even cruel, only a simple fact. "I am not going to die because of your useless morals."
âCan I not what?â he asks, at last. âWhat do you want me to say, Nolvoâoh no, brother, please do not wed, so that we may continue our ill-advised perversion behind closed doors? Do you want me to fuck you slow and gentle, tell you that it has always been you? That I will ruin your wedding and leave my wife, so we may run away to live lifeââ
NolofinwĂ« reverses their positions with such force that FĂ«anĂĄro is slammed into the wood panelling, all air punched out of his lungs. This is more like it; this is how they began, what they know; what is, in the end, all they ever ought to be to each otherâNolofinwĂ«âs features contorted in fury and hurt, FĂ«anĂĄro baring his teeth like he is just waiting to cause more of the same.
They stay there for a moment, both breathing harshly, a precipice that is only waiting for them to fall. â FĂ«anor, Fingolfin, and their last night before Fingolfin is to be wed.
âCan I not what?â he asks, at last. âWhat do you want me to say, Nolvoâoh no, brother, please do not wed, so that we may continue our ill-advised perversion behind closed doors? Do you want me to fuck you slow and gentle, tell you that it has always been you? That I will ruin your wedding and leave my wife, so we may run away to live lifeââ
NolofinwĂ« reverses their positions with such force that FĂ«anĂĄro is slammed into the wood panelling, all air punched out of his lungs. This is more like it; this is how they began, what they know; what is, in the end, all they ever ought to be to each otherâNolofinwĂ«âs features contorted in fury and hurt, FĂ«anĂĄro baring his teeth like he is just waiting to cause more of the same.
They stay there for a moment, both breathing harshly, a precipice that is only waiting for them to fall.
â
FĂ«anor, Fingolfin, and their last night before Fingolfin is to be wed.
Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.
â Live Streamingâ Interactive Chatâ Private Showsâ HD Qualityâ Free Actions
Free to watch âą No registration required âą HD streaming
âYou know as well as I do that the aphrodisiac is never meant to be consumed in such a high quantity,â ĂolofinwĂ« says evenly. âIt is well known to be lethal in such a high dosage if there is no one around to lay with.âÂ
FĂ«anĂĄro shoots him a scathing glare, as if ĂolofinwĂ« has said something incomparably stupid. âI am well aware of the properties of the plant,â FĂ«anĂĄro says flatly, shrugging his jacket off and glaring at the pollen on it. âBut I am not alone, am I?âÂ
It takes a moment for FĂ«anĂĄro's meaning to hit him, and he does not quite stop himself from gaping when it does. "We cannot lay together!" he exclaims, voice going humiliating high with horror. "You are my brother!"
The words earn him nothing but a disparaging snort; FĂ«anĂĄro only half paying him any attention at all as he glances around the clearing. "You are not my brother," he says, and the words are not even cruel, only a simple fact. "I am not going to die because of your useless morals."
Since Lalwen was young, her sister Findis has dreamt of becoming a handmaiden of Varda and to dwell on Taniquetil, removed from the world and her troublesome family. But when that dream clashes with Lalwen's desire for her sister, which will win out?
ĂolofinwĂ« is into his third glass of wine when disaster strikes.
The smile stays on FĂ«anĂĄroâs face even as his eyes pass over his siblings âeven as he addresses ĂolofinwĂ« directly, looking steadily into his eyes with that expectation of a response that always forces ĂolofinwĂ« into answer, no matter whether or not heâs gathered his words.
"So perhaps I love you not as a brother should love a brother, or perhaps exactly as a brother could have, with all the complication and contradiction that entails. I love your brilliance and your cruelty, your certainty and your blindness. I love the way you and Lalwendë moved through the world as if it owed you glory as your birthright, any compromise a defeat. I loved you all, and I resented you."
A series of letters to the departed and exiled FĂ«anor, in whose absence Finarfin's long-held fixation with his oldest brother comes to the surface, and mingles uneasily with his sorrow at the loss of his siblings and his children
Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.
â Live Streamingâ Interactive Chatâ Private Showsâ HD Qualityâ Free Actions
Free to watch âą No registration required âą HD streaming
In the hall of Formenos, the messenger, solemn of mien, conveyed Lord Irmo and Lord Manweâs heartfelt wish that Feanaro visit Lorien to heal the wounds Melkor had wrought upon him. Feanaro may be very much unwilling, but the alternative requires introspection which will hurt, heal, and ultimately change more than just his perspective.
Prompt: Someone encourages Feanor to keep a gratitude journal to get a better perspective on his life. Could take place in any time period (Years of the Trees? while on the Flight? in Mandos? after re-embodiment?). Could go comic or angsty, or both!
And the first week of posting is at an end with an amazing selection fics and a beautiful piece of art! All works are beneath the cut - we encourage you to leave the creators some love <3
Title: On the Nature of Princes
AO3 username: Nerdanelparmandil | @nerdanelparmandil
Rating: Gen
Warnings: No warnings apply
Pairing/main characters: Fingolfin, Feanor, Maedhros
Medium/Word Count: fanfiction, 6000 words
Summary:
Maitimo grows up in a royal household, with duties and expectations that weigh heavy on his shoulders. Two are the people he can look up to. On the one hand, his father, the Crown Prince, unreachable and hard to please. On the other, the high Prince Nolofinwe, paragon of virtue, dexterous at court - the man his father hates the most. A look at the relationship between the two sons of Finwe, from the perspective of one who has found himself in the middle of their strife, at first by chance and then by choice.
Title: A History of Duels
AO3 username: LeetheVix | @antlered-vixen
Rating: M
Warnings: Choose not to apply
Pairing/main characters: Feanor/Fingolfin
Medium/Word Count: 12.641
Summary:
ĂolofinwĂ« needs to win, if just once. He chases and despises, he yearns for and resents, he fights and fights and fights. Then, he wins. Or might have, if FĂ«anĂĄro was something to be won.
Title: Well I wonder if it's wise//To hold you like I've wanted to before
AO3 username: Tar-Eleniel | @alanastarveil
Rating: Explicit
Warnings: Incest, sibling incest M/M/M/F/F, anal sex, oral sex, vaginal sex
Pairing/main characters: Feanor/Fingolfin/Findis/Finarfin/Lalwen
Medium/Word Count: 3,802
Summary:
In the Fourth Age of Arda, Findis, Finarfin, Lalwen, and Fingolfin have resumed the relationship they had before the Darkening; after Fingon and Maedhros' wedding, they decide it's time to finally get up the courage to see if they can get Feanor to join them, as they have wanted to for literal ages.
đŹ 0  đ 16  â€ïž 37 · Created for the @finweansiblingfest!
Is FĂ«anor actually speaking ill of Fingolfin? Of course not! Finarfin would not eng
----------------
Title: Your Fire Burns Me; Keeps Me Warm
Ao3 name: CaughtInFicHell | @comeontakemyname
Rating: T+
Pairing/main characters: FĂ«anor/Fingolfin
Warnings: Half-Sibling Incest
Medium/word count: fic, 7547 words
Summary:
When the duel with Morgoth ends differently, Fingolfin is saved at the last minute by his brother, as what is left of FĂ«anor escapes one of the Silmarilli. The aftermath becomes a complicated knot of feelings as, for the first time in centuries, the brothers have to face each other.
Title: The Daughters of Finwë
AO3 username: gerardway | @fatbishonen
Rating: ExplicitÂ
Warnings: Creator chose not to use archive warnings
Pairing/main characters: Findis/Lalwen
Medium/Word Count: 5505
Summary:
For the Finwean Sibling Fest. Prompt number 69, "This is a general nasty angsty sister femslash incest prompt. Does Findis feel wracked with religious guilt? Is she using Lalwen as a substitute for someone even more forbidden, unspeakable even? Make it upsetting and dark as you like."
Title: Love and Study
AO3 username: StarShadeEmily | @starshadeemilyart
Rating: E
Warnings: Underage, Incest
Pairing/main characters: Feanor/Irime Lalwen
Medium/Word Count: 11,733
Summary:
Feanor tutors Lalwen in the ways of love. After a painful first time, Lalwen goes to Feanor for sex advice, which quickly leads to him having sex with her to demonstrate how to do it correctly. Of course, because heâs Feanor, he takes notes and gives her a report card. Meanwhile, Lalwenâs relationship with her new boytoy is blossoming, and they research a way to have sex without being married. Of course, being Lalwen, she strings him along and plays with his heart, and makes him listen to her talk about frogs and her fanfiction for hours. A skillful lover should never be too easy. The Feanor/Lalwen/Fingolfin psychosexual triad intensifies. Lalwen explores what it means to be a sexual being in a repressive society.
Feanor tutors Lalwen in the ways of love. After a painful first time, Lalwen goes to Feanor for sex advice, which quickly leads to him having sex with her to demonstrate how to do it correctly. Of course, because heâs Feanor, he takes notes and gives her a report card.
Meanwhile, Lalwenâs relationship with her new boytoy is blossoming, and they research a way to have sex without being married. Of course, being Lalwen, she strings him along and plays with his heart, and makes him listen to her talk about frogs and her fanfiction for hours. A skillful lover should never be too easy.
The Feanor/Lalwen/Fingolfin psychosexual triad intensifies.
Lalwen explores what it means to be a sexual being in a repressive society.
Warnings: Creator chose not to use archive warnings
Pairing/main characters: Findis/Lalwen
Medium/Word Count: 5505
Summary:
For the Finwean Sibling Fest. Prompt number 69, "This is a general nasty angsty sister femslash incest prompt. Does Findis feel wracked with religious guilt? Is she using Lalwen as a substitute for someone even more forbidden, unspeakable even? Make it upsetting and dark as you like."
When the duel with Morgoth ends differently, Fingolfin is saved at the last minute by his brother, as what is left of FĂ«anor escapes one of the Silmarilli. The aftermath becomes a complicated knot of feelings as, for the first time in centuries, the brothers have to face each other.
Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.
â Live Streamingâ Interactive Chatâ Private Showsâ HD Qualityâ Free Actions
Free to watch âą No registration required âą HD streaming
Works are all in the process of being revealed right now! The first one was revealed on the 28th (last Friday) and we will be revealing one each day until they're all revealed. There will be a masterpost of all the works at the end of the fest!
Is FĂ«anor actually speaking ill of Fingolfin? Of course not! Finarfin would not engage in such juvenile behavior. The conversation is innocent, wholesome even, a mere jest or anecdote...
(...but Stars above, doesn't it feel good to have FĂ«anor's attention, all of it, all on him, even if for just a little bit?)
Fingolfin, of course, knows better than anyone when FĂ«anor is trying to get under his skin. Unfortunately, 'knowing better' does not confer immunity to annoyance...
(... or anger... or spite ... or... envy...?)
I plan to continue this with future art (or maybe even a fic, if I am particularly brave)! I hadn't considered this pairing until taking on this prompt for the Fest, but I'm very glad I did!
[Special thanks to @antlered-vixen for help with the designs and wardrobe! ]
--------------------------------------
Original Prompt for the Curious:
Pairing:Â FĂ«anor/Finarfin or FĂ«anor/Fingolfin/Finarfin
Warnings:Â Incest
Prompt: Fëanor who decides that a great way to get under Fingolfin's skin would be to show Finarfin favoritism (some kind of fucked up "it's not because you're my half-brother that I hate you it's because you're you") & then he ends up actually liking Finarfin and they end up sleeping together and then maybe Finarfin finds out about why Fëanor even started paying attention to him to begin with and reacts badly (or he already knew and is just kind of like meh about it up to you!) Super fine if this ends up spiraling into a Fëanor/Fingolfin/Finarfin ship instead!
