1 - 20 of 386 Works in Sylvain Jose Gautier/My Unit | Byleth
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Glass Table Girls by willow4040404
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses, Fire Emblem Series
30 Sep 2025
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Summary
Byleth, on Captain Jeralt's orders, finds herself on a odd-job in Gautier lands some five-or-so years after an unexciting teaching stint at Garreg Mach; for an aimless Sylvain, who has long since watched his friends find their footing in the world and move up in life from afar, the professor's sudden reappearance is nothing short of an upheaval.
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the right smile by alyssawaking
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
29 Sep 2025
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Summary
Ever since you came back "from the dead", things have been different with the Blue Lions, but particularly with Sylvain. His promise to you at the Goddess Tower lingered at the back of your mind. But why was he suddenly acting so diligently?
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Galo Cantando by LiliCarabina
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
26 Sep 2025
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Summary
Byleth bate com a cabeça e se sente confusa. Tem um ruivo muito bonito ao seu lado falando coisas que a deixam vendo estrelas.
- Language:
- Português brasileiro
- Words:
- 1,248
- Chapters:
- 1/1
- Kudos:
- 2
- Hits:
- 4
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Nourishment for the Mind by BlueStarxoxo
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
24 Sep 2025
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Summary
Byleth is a professor who takes his job at Garreg Mach seriously. This means respecting the boundary between teacher and student, but when he falls for Sylvain, that boundary disappears. Will he lose his job?
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Manejar Uno Más by RedBaron
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
20 Sep 2025
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Summary
Sylvain y Byleth disfrutan de su noche juntos.
- Language:
- Español
- Words:
- 624
- Chapters:
- 1/1
- Kudos:
- 2
- Hits:
- 33
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A Cozy Vacation Morning by mpregfanatic808
Fandoms: Fire Emblem Series, Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
01 Sep 2025
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Summary
A pregnant Sylvain and his husband Byleth enjoy a cozy morning in their vacation home.
(Fic originally written in August 2021, but just now uploaded.)
Series
- Part 5 of Fire Emblem Three Houses Mpreg Oneshots
- Part 1 of Mpreg Fanfics 2021-2025 [From the Vault]
- Language:
- English
- Words:
- 763
- Chapters:
- 1/1
- Kudos:
- 1
- Hits:
- 42
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The Curious Professor and the Competent Playboy by Baconicon
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses, Fire Emblem Series
07 Aug 2025
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Summary
Despite knowing of his infamous status as the resident playboy of Garreg Mach, Byleth attemps to talk some sense into Sylvain, hoping that maybe she could get through to him.
Instead, the busty Professor is quickly seduced and offered a chance to see just what she's been missing out on.
Call it curiosity, but Byleth accepts, falling into a spiraling whirpool of lust and depravity that alters the course of her life, all at the hands of her playboy student.
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and i'd do it again by yuujispecs
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
28 Jul 2025
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Summary
Even when Byleth had rejected his initial proposal at the Goddess Tower due to his reputation during his academy days, Sylvain promised he would continue to propose until she understood he was serious, which has led to the man constantly visiting Byleth to propose to her for months following the end of the war.
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You will do but just enough by Error404NotFound
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
27 Jul 2025
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Summary
Byleth drives him nuts. And it’s revolting how much Sylvain can’t stop looking at him.
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still waters run deep by blue_crabs_from_maryland
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
06 Jul 2025
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Summary
It was easier when the boys were young.
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To Fall, To Fly, To Fall Again by Pavlovs_canary
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
21 May 2025
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Summary
His perspective on life realigns suddenly, on the battlefield, with the sound of a spell meeting flesh and a pegasus’s scream.
OR
Byleth falls, literally, in battle. Sylvain panics, and then reflects.
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Testing Bonds by Green_Eyed_Dragon_Fanfiction
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses, Fire Emblem
26 Apr 2025
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Summary
My brother and father have been mercenaries for as long as I can remember. That is until we rescue a few kids (I call them kids, but they can't be much younger than my brother and me) from some bandits. The girl in our dreams saves me from being murdered. Before we can process that, our dad is dragging us to Garreg Mach Monastary and our world is thrown on its head. The change from merc to teacher is bound to be a rough one, but with my brother and father by my side I'm sure we can do it. It couldn't be that hard to teach some kids for a year... right?
Arleth (F!Byleth) attempts to navigate the political landscape of Fodlan.
Objective: Keep herself and her family alive.
Obstacles: Just about everything (including dying and merging with a goddess?) and everyone.
Unexpected Consequences: Falling in love with a brunette songstress and a redheaded margrave???? -
Proselitismo by LiliCarabina
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
16 Apr 2025
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Summary
Sylvain não pode resistir se a arquiepiscopisa um dia lhe abandonar.
- Language:
- Português brasileiro
- Words:
- 150
- Chapters:
- 1/1
- Kudos:
- 3
- Hits:
- 12
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The Ashen Demons Lust by DarkEspeon32
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
10 Apr 2025
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Summary
The Byleths have found themselves as Professors at Fodlan’s Officer’s Academy. But it turns out, both of them have a libido that cannot be controlled. Follow them as they wind up fucking several of their students, sometimes multiple at once!
Chapter 1: Sylvain x FByleth
Chapter 2: Hilda x MByleth
Chapter 3: Bernadetta x FByleth
Chapter 4: Dorothea x FByleth
Chapter 5: Felix x Annette x FByleth
Chapter 6: Mercedes x MByleth
Chapter 7: Yuri x MByleth
Chapter 8: Ashe x FByleth
Chapter 9: Hilda x Marianne x MByleth
Chapter 10: FByleth x Dorothea x Blue Lion Men -
Succubus of Flames by 2ndMLsyndrome
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
31 Mar 2025
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Summary
“You’re troubled,” she told him, as if that changed much. Though she sustained on emotion itself, she never understood it that well. Words meant to comfort instead came across as prodding. Byleth didn’t have the combination of words necessary to ease him.
“You don’t say,” he echoed back, reaching up his other arm to cradle her cheek. She let him. Byleth hummed again, sinking in the feeling of it all, the feast right before her preparing itself without much effort on her part. She rolled her hips atop his, catching how his lips parted, how his grip tightened on her cheek.
After another, he joined her.
Or. Byleth is a succubus, Sylvain is her first victim. Multichap, Porn with plot (somewhat)
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Wings by AmbiguousRubbish
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
30 Mar 2025
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Summary
After their most recent talk, Byleth couldn't stop thinking about what Sylvain had said about crests and how bleak he saw his future. Then the idea came to her, she could give him something that could ease a bit of that burden.
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Pride Before I Fall by kdriegantier
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
26 Mar 2025
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Summary
Here’s my self-indulgent Sylveth longfic.
Student!Byleth AU. AM route with some VW and CF implications.
*for all intents and purposes, everyone in the Academy Phase is aged up to an adult*
**NOW COMPLETE**
Series
- Part 1 of Sylveth Agenda
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Fuck the pain away (my bed is in ruins) by Error404NotFound
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses, Fire Emblem Musou: Fuukasetsugetsu | Fire Emblem Warriors: Three Hopes
28 Dec 2024
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Summary
Sylvain hits jackpot when Professor Eisner (who Sylvain likes a tiny bit more than he's willing to admit) says yes to an exclusively casual relationship. Summer is calling and nothing could go wrong.
Or, Sylvain catches feelings.
Series
- Part 3 of Byleth likes parties AU
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Farewells and New Futures by CieloBello
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
28 Dec 2024
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Summary
Sylvain has been traveling with Marianne and Ashe across the Fodlan region to pursue their dreams. He knew they wouldn't travel together forever, but he never expected the day one would leave their party to come so soon. However, the life of a trainer means for every friend you say goodbye to, you greet a new one.
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COVENANT by Feylin, Silramil
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses
24 Dec 2024
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Summary
PLEASE SEE LAST CHAPTER FOR UPDATE. THIS WORK IS ON HIATUS. THIS WORK WILL BE COMPLETED AT A LATER DATE AFTER DELETION. WE'LL SEE YOU SOON!
The first time Byleth bathes his blade in the blood of his students, he knows there has to be a better way. But in what has to be at least two decades of traveling back and forth through time, he hasn't found a way to save everyone -- yet.
This time, though, it's going well. He's made it almost all the way through the war without losing anyone he couldn't get back. Unfortunately, a long-lost sister was one variable he did not account for, and time is running out to re-balance the equation.
Multiple-POV; the culmination of several arcs that explore a world where Byleth's time travel is more than just a re-written save file. For full context, it's best to read the several prequels, or at least LACRIMOSA.
Series
- Part 7 of COVENANT