Author's note: Hello everyone, this is my first Fire Emblem fic and my second one altogether. This idea came to me right after finishing the Ashen Wolves DLC. I wanted to make my ideal story of how Fire Emblem Three Houses came down. So yeah, this is a retelling of the game with some minor and major differences here and there.It will also be a somehow a romance story, with the main character being Byleth, Edelgard, Felix and Annette.Hope you enjoy it.I do not own Fire Emblem of it's characters.

Chapter 1

The Monastery

I

Traveling around Fódlan was both a luxury and a dangerous business. Although The Empire, The Alliance and The Kingdom had been on a lasting peace so far. Most of the conflicts were limited to, in, around or between the Lords' domains being for a territorial dispute, being an economical matter. The reasons didn't matter, the important thing is that the ones who suffered the most were the little townspeople, the investability and the constant attacks of bandits made the living harder than it should be.

As mercenary, Byleth traveled around the continent following his father Jeralt not really caring for political or social standards. He was quite skilled with any weapon he could get hands on to and most of their greatest victories were thanks to Byleth prodigal knowledge of the battlefield and foresight. He had a talent, but how to explode it he didn't know.

The night there youngsters appeared to request Jeralt's help was when everything changed.

All three of them was remarkable in both decorum and skill. There was this youthful man dressed in yellow who's warm smile looked like it was permanently attached to his face, his name was Cloude, the other man was dressed in all blue, is mannerisms were something to see to believe, he was like a prince taken out right from a fairy tale with his shinny blue eyes and golden hair, his name was Dimitri.

But Byleth had to take a look twice to the third person, a very small young woman dressed in red and black, and although her stature wasn't all that amazing, she had an aura of athority and determination that almost made Byleth flich when she looked at him with those deep purple eyes. Her white hair was out of this world, unnatural and alluring in a sense, with a delicate body like that someone would think of her as a talented magic caster or a small sword user, maybe even a pegasus knight…but no, the young Edelgard Von Hreavelg was a powerful Ace user and smited the poor bandits coming after her and her companions.

As if not enough strange occurances happened in one night, he was transported to a dream like state just when the leader of the bandits was about kill Edelgard and the mercenary jumped between them receiving the hit.

He could barely remember what happened next, a small little girl called Sothis with the smugiest face he had ever seen saved him from death by turning back time.

And now he was walking through the hallways of Garrett Mach Monastery were his father had spent his younger years as Captain of the Knights of Seiros.

Then he met the Archbishop Rhea, a woman with a kind expresión and a voice to match. She had the divine aura of a goddess and... wait, they wanted him to what?

"They want you to teach here" Jeralt repeated without holding back a smirk.

"You mean like in a classroom and looking after some bratty kids?" Byleth said annoyed "I thought we'll just say hi or something and go on our way. And now you're telling me we are staying here?"

"They offered me my old job as Captain, that would make us a lot of money and we'll have three meals a day and a soft bed. You know at my age I can't be wandering around Fódlan forever, sleeping on the ground and out in the cold" He explained with a soft tone "You are welcome to take my place as the leader of the band of mercenaries instead if you want"

Byleth looked away, no, he didn't know how to properly manage a business like a mercenary company, he was a man of battle and tactics, not management which bed the question of why the thought he could be a good teacher.

"That's what I thought" Jeralt said hitting him in the back "Now go, you should get to know your future students!"

Byleth left the second floor feeling like he had just enter to a bizarre nightmare.

II

Strolling through the dorms was a orange haired girl, her steps had some kind of rhythm to it, she was happy because she just got and A plus in Theory and Reason, her favorite class right after cocking, although the second one was an elective. She stopped right in her track when she heard two female students talking about a band of mercenary in the monastery.

"Did you managed to see the leader?" One of the girls ask.

"Yes, he was a big man with a weird haircut, I heard from Leonie he is quite the fighter. But there is this other guy."

"Other guy?"

"I don't know if he is is assistant or his son, although the don't look much alike. He is quite handsome with dark green hair, but always has that boring expression on his face."

"Sound like Felix to me. Do you think he is attending this school?"

"Maybe, I saw him walking around the classrooms"

The orange haired girl's interest picked up and she walked to the classroom area. There were to many students going around since it was recess. She picked her head around the corner to scan the area and then she saw him.

He was talking with Claude near the Golden Deer classroom. His clothes were strange and making justice to the other student's comment, yes he looked bored as all hell.

"What are you doing, Annette?" A cold voice spoke just a few centimeters behind her causing her to squeal and some of the people around them turn to see them.

"Felix! Why did you scared me like that?" Annette said waving her arms in the air in frustration.

"It's not my fault you are such a scary cat"

"I'm not!"

"Whatever, so who were you spying on?"

"I wasn't- *sight* whatever, there" she said pointing at the man with the green hair "I heard some girls talking and it looks like that guy is going to be a student here. Weird thing is that he seems to be a mercenary"

"So he brought his way in. What so strange about him, he looks bland as hell"

"He also seems to be the son of Jeralt Reus Eisner"

The bland expression on Felix's face then changed slightly, the adamant swordsman was very hard to impress, but Annette knew he was excited when his yellow eyes let out that special glow.

"So that means that we will finally have some decent challenge around here"

Annette let out a sight "Always thinking on fighting, are you?"

"At least I'm not always in the clouds like you, thinking on stupid things"

Annette looked at him with a frown "No, you are actually in the earth like brick, or better yet, like a brick head"

"Whatever, I have to go train. See you at class"

With that Felix walked away. Annette decided to go tell her best friend Mercedes about the new student.

Annette noticed the smell of sour almyran tea in her hair, it was Felix's favorite. The young woman wondered if she found some of that she can make the swordsman a little more open minded and not so angry all the time.

III

Well, Byleth had to admit it, his father was right on one side. The monastery was truly a marvelous piece of architecture, the green house, the cathedral, the market, it was all like a little city inside a fortress were the student could grow in mind and body without worrying about outside world problems.

Even though Byleth was a man of war, he always wanted to live his final years in peace and enjoy reading books and new ways of fighting. But he was only 21, can he really leave the life of a mercenary on such a short age? Can he really teach this kids to be warriors?

This were the people that would rule Fódlan for Seiros' sake! He was just a mercenary with really bad organizational skills and-

He was interrupted when someone laid a hand on his shoulders, he turned to see that white hair girl, Edelgard was her name was it? And the first in line to the throne of Adestris.

"Oh, Lady Edelgard." He said with a bow "Is there something I can help you with?"

"You know is just Edelgard, right?" She said with a smile.

"Funny, Cloude and Dimitri said the same thing"

"We are not seperated by status here, even though Hubert can't help but still call me by my title, but I have already given up on him" she shrugged "On another note, I heard you had been wondering around the Monastery. Are you liking the place?"

"Quite a lot, actually. I never expected a military academy to be so...mmm I want to say harmonious"

She let out a little laugh, it was brief and small but not out of place at all "Is the first time a heard that word to describe the academy. But is quite fitting." She turned around signazing the mess hall "If you're hungry I would love to share a meal with you"

"That would be perfect, thank you."

When they reached the mess hall his nose was assaulted by the delicious smell of roasted beef with boiled vegetables and smashed potatoes. Although the lunch was already been served, there were two students still cocking in a little corner on the left, a tall girl with ashen yellow hair and a very small red headed girl.

Byleth and Edelgard took a seat near a window, on the other side of the table was that upbeat boy called Caspar and his friend from the Blue Lions house Ashe.

"Greetings, Ashe Caspar, may we join you?"

"You bet!" Said Caspar and then he turned towards Byleth "Hi-ya, you're from those mercenaries right?"

"Yes, my name is Byleth"

"Beileth, got it"

"No no, it's said Bai-leth"

"What a strange name" said Ashe "Are you perhaps from outside Fódlan?"

"Nope. Born and raised. Although a never knew my mother, she died giving birth to me and, well my father doesn't talk about her much"

"Oh, I'm sorry I asked"

"It's okay, but tell me, you guys must have some experience in battle" he said changing subject.

"We have only been in a few missions and I'm mostly shooting arrows from afar."

"Not like me" said Caspar with a wide grin "I like to beat the crap out of those bandits with my very own punches"

"So you are a brawler, that's a hard class to master but very powerful when you do"

"You bet, you and me should have a sparring contest"

"Caspar, he had only been here for a few hours and you already want to pick a fight with him?" Said Edelgard with a disapproving frown.

"What? If is going to study with us I need to test him to see if he is fighter material"

"I'm quite sure he had been way more battles than you"

Then an idea came to Byleth's mind "Actually I might be a good idea" he said with a smile "Yes Caspar, I accept your challenge"

"But you guys just ate" Ashe protested.

Caspar let out a big laugh "No better time to fight but with a happy stomach!" He stood on the wooden chair "Hey everyone, the new guy and me are going to fight in the training ground, come see"

"Goodness" said Edelgard trying to hide her face but she raised her head when Byleth offered his hand.

"Come on, it will be fun"

Edelgard hesitated for a second before taking it. They were followed by all the students in the mess hall

"Annette, o don't think you should keep adding more of that kind of salt" Mercedes said looking at the weird yellow liquid they were cooking and was supposed to be a chicken stew. But it looked and smelled like puke.

The red headed girl let go on the spoon with a sad face "Why can't I do this right?"

Mercedes put a hand on her shoulder "You will eventually do it right, Annette. You just need practice.

Then they heard the raking of people going out of the mess hall like a stampede "What's happening?" Annette asked to a student.

"Caspar is fighting the new green guy in the training grounds" he answered "Let's go see it"

"Oh, but I have to clean this"

"Don't worry dear" one of the employees in the kitchen said "I'll take care of it, go have fun"

"Thank you very much" she said with a bow and went out of the kitchen onto the training grounds.

IV

"The hell it's all that noise" Felix complain interrupting his training session with Dimitri and Dedue. If there was one thing he hated the most was to be bothered during training.

Suddenly a lot of student were entering the training grounds and making noise.

"Is that Caspar?" Dedue asked. It was indeed the green hair boy and it looked like he was causing the racquet, but then beside home were Edelgard and that new student with weird clothes.

"Edelgard, what is the meaning of this?" Dimitri asked.

"Don't ask me. This was Caspar's idea"

They turned towards Caspar who was already getting is wooden gloves. To Felix's surprise the new guy was also taking a training sword.

"Alright, new kid" Caspar smiled "It's time for the show"

"Wait a minute" Felix said "We were in the middle of our training, you can't just barge in a turned this into a spectacle"

"Aw, but come on Felix we are just having fun"

The new guy interjected "And besides you can consider this some kind of training"

"You shut up" Felix said pointing the sword at him.

"The name is Byleth, you little brat"

Everyone in the courtyard made a ooohhh and gasped. Felix almost felt a vein explode in his forehead while turning to Byleth "What did you just called me"

"You heard me"

Fleix stood silence for a second "You know what? Caspar, I'll be taking this one for you"

"What? No way, I asked for a match first"

"Well too bad"

Byleth made a smug smile that made Felix angrier "You can both take me on if you want. I'm fact, Caspar is from the Black Eagles and Felix is from the Blue Lions, so" Byleth turned to Claude who was actually smiling, it seemed the little argument was amusing to him "Why don't you choose the best warrior from the Golden Deer house? I'll face all three of the best"

A murmur ran around the field while Cloude smiled away "You are quite the show off aren't you?"

"It's just an idea I had. Would you comply?"

Cloude turned his eyes to the pink hair by his side "Hilda, you're up."

"Ugh do I have to?" The girl complaint.

"Yes please, and if you win I'll buy you dessert for a whole month"

Almost at lightning speed Hilda took a training Ace and jumped to the courtyard.

"We are all set then" Byleth walked to the center and took his stance. It was a very weird stance, with the sword over his shoulder and practically letting his front guard down. Felix almost smiled seeing how inexperienced this guy was to advance strategy. He was probably used to fight mere brigands without professional training.

The three students approached slowly and of course Caspar was the first to attack.

Byleth let out a smile, a rare occurrence in his face "Lesson One: if you are feeling confident, you can attack first, but never charge" he said twirling on his leg like he was dancing, he dodged Caspar's fist and hit him in the back with the wooden sword, if it were a real one Caspar would had gotten a pretty bad cut on his back. "This is a duel, not a battlefield, your opponent's attention won't be on no other than you"

Byleth was distracted and of course Felix and Hilda took the chance to strike him from behind, but the mercenary was merely pretending and jumped back dodging Hilda's axe and blocked Felix's sword. He was stronger than Felix thought, he could hold against Felix's two handed technique with only one hand.

But the student slide the wooden blade across his enemy's and move to one side to make a spinning cut. Byleth flexed his legs so he was able to avoid the hit.

Caspar appeared from the other side and tried to punch Byleth right in the face. He wasn't lucky for you see, the mercenary was just waiting until both student were near so he dodge both hits and the second one connected with Felix's white face sending him against a pillar.

"Lesson Two" Byleth said "When facing the same opponent it is important to corner him, but if you let yourself get too close to your partner you could hurt him or her like was just happened"

Felix needed a moment to recover from the hit, Caspar was an expert brawler and his raw strength could only be matched by Dedue's or Raphael's.

He put himself together only to see how easily Byleth dodge another of Hilda's attack with such precision and speed he looked like a leaf in the wing, and the three students were trying to catch it and failing miserably.

A leaf in the wing? Of course!

He stood up just at the moment that Byleth kicked Caspar in the the leg to destabilize him, he grabbed Hilda by her shirt and threw her with an incredible strength towards Caspar. Both student rolled towards the crowd and hit the wall, both grunting and trying to stand but they were both to dizzy to keep the fight.

Byleth turned to Felix and the young man could swear he could kill him with his gaze.

He didn't let that intimidate him and concentrate his thoughts.

Just as he was collecting his thoughts, Byleth took a stand "Lesson Three: If is a one on one duel, speed and precision are the key"

Speed and precision alright, does were the best qualities of Felix Hugo Flardarius and he will put it to good use.

Felix took a stand and breathed slowly, ignoring everything and everyone, in a moment of brief distraction he saw Anette dedicating him two thumbs up. He didn't looked twice.

The moment was right when he saw how Byleth move his right ankle in a motion to jumped forward so Felix quickly, almost like a hawk, try to dodge the hit that he thought would come. But he wasn't leaping forward.

Instead Byleth made a spin again changing the direction he was going with the same ankle, it was a bold move that done wrong could course some serious damage to the leg. But he mercenary performed it with perfect synchrony and the reward was a swing around Felix's sword that landed right in his neck, if it was a real battle, Felix would have lost his head without even landing a single hit.

"Class is dismissed" Byleth said with a smile.

The crowd applauded and cheered for the four combatants while Felix couldn't even move a muscle on how shocked he was. He was snapped out of the speed when Byleth placed a hand on his shoulder.

"It's the first time a see anybody move that fast" he said with a smile "Just a little more practice and you'll be unstoppable"

Felix slapped his hand away "I don't need your stupid advise"

Byleth simply shrugged "Whatever you say"

"I see you're getting along with the students..." said Seteth who was now I'm front of the crowd "Professor Byleth"

A big gasp came in unison while everybody turned to look at the mercenary that just smiled nervously "It was just a friendly sparring match."

Seteth's template didn't change from his stoic manner "Sparring matches must to be scheduled in advance, the training of our student most not being interrupted for a meaningless competition like this." He turned to the crowd "Now, all of you, return to your classes at once"

And as fast as the courtyard filled with people, it emptied at the same speed, nobody wanting to summon the wrath of the Arbishop's advisor.

In the end only Felix, Annette, Dimitri and Dedue stayed.

"So he wasn't an aspiring student after all" Dimitri said with his hand on his chin.

"But he didn't look like a teacher either" Dedue interjected "Frankly, I thought it was some kind of inspector or a traveler"

Anette made a curious face "Do you think he will be our new professor, Hanneman said there will be some rearrangements in schedule and administration."

Felix turned and picked up his training sword "I don't care if he is going to be the janitor. Next time we fight, I will beat him."

Dimitri picked his spear "I'm afraid you have a long way to go before that"

V

The soft white light of the moon managed to cast an azure shadow all over Garrett Mach, the silence had already taken over the hallways and student and staff were rather sleeping or passing the last hours of the day in their rooms.

Edelgard sat on a barrel, Hubert of course was standing behind her like a looming shadow, most people often confused him as a vampire due to his white skin and the bags under his eyes, Bernadetta was particularly scared of him.

They both just sat there looking at Byleth who was sitting at the edge of the dock with a fishing rod casted in the water.

"He is quite the strange person, is he not?" Hubert said with his deep voice.

"I will admit it was a surprise to find out he will be our new professor. And his skill is nothing short but spectacular."

"I don't trust him"

Edelgard let out a small laugh "You never trust anyone, Hubert."

"And that's what makes me such and efficient assistant. You should practice that kind of distrust once in a while"

"I know exactly who to trust, my friend. And although this Byleth person it's a strange one, I'm sure he can be a fine help for our purposes, we'll have to put him to test, though"

"Should I arrange everything, my lady?"

Edelgard simply nodded and the man went posthaste to put her plans into motion.

Byleth couldn't heard them from where he sat and Edelgard just observe him for a few minutes, he was so concentrated in his task that at one moment she thought had fallen asleep.

Then suddenly he stood up screaming. "Aja!! I got one!"

The fishing rail traveled around the water an a tremendous speed and Byleth was clearly struggling to hold his ground.

"Edelgard, I can use a little help here!"

She was dumbstruck for a second but she quickly ran to his side and grabbed the fishing rod. Her Chrest gave her superior strength even with her slender and small figure and with their combine efforts, they managed to get out a huge fish. The animal landed on the dock and before any of them could catch him it went back to the water.

"Nooooooo!!!" Byleth squealed falling to his knees as if someone had just killed his pet dog. Then he just sat on the floor with an annoyed expression.

Edelgard sat beside him "Are you alright? You looked quite distraught"

"I wanted to eat some good fish before going to bed"

"I don't think you could had done it either way, the kitchen closes after dinner. Are you used to hunt your own food all the time?"

"Of course, my father tough me everything about survival, but that doesn't mean I love camping. Nothing can compare to a soft bed."

"So, have you decided if you want to stay yet. I hope there's more reason than just a bed."

He let out a laugh "To be honest, I was skeptical at the beginning. I have never had that kind of responsibility, to be some kind of role model. I mean, I'm not even that much older than all of you."

"Well, as far as I know, being a teacher is not just about wisdom or age. It's a combination of various things like responsibility, patience and also humbleness"

"Humbleness huh?" Byleth sractched the back of his head "So I guess that sparring session wasn't something a teacher should do"

Edelgard nodded like she was scolding him "You still need to work on that, if we are to be your students, you must not show how you're better but instead how we can do better."

"You'll do fine teacher, Edelgard. Haven't you thought on joining the monastery after you graduate"

She smiled. If only you knew.

"I'm afraid my duties as next Emperor would be quite the obstacle." She stood up brushing the dust off her skirt "But if you do decide to stay, we will make sure that all of us make you feel welcome. Good night, Profesor Byleth"

And with that she went to her dorm thinking on what a shame would be to encounter Byleth in the battlefield.

Edelgard went to bed praying that the young mercenary decided not to join the Monastery and the Church, even though a part of her still desired to get to know him better.

VI

After Byleth choose to stay and decided on one house to teach. He took some books from the library to help him in his lecture, his first class as an official teacher. Just two days ago he was thinking on the next battle, and now he was thinking about time management and seminaries.

He stood up from his chair and went out of the main building, he walked all the way to the classroom were his students were already waiting.

With decision he walked towards the board and wrote his name, then he turned to his students.

"My name is Byleth Eisner, and I'll be the new teacher of this class. Pleasure to meet you, Black Eagle House"

Author's Note: And that's it for the first chapter, for those who haven't read my work, I'm a little off in my English since is not my mother tongue, I want to use this opportunity to ask you that if some of you are interested in being a beta reader to help me with grammar, just PM me.

If you want to read more of my work, I have a Final Fantasy XV story in my profile and a Bloodborne story and Resident Evil story waiting to be released.Thank you again for reading with my broken English and everything, peace!