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2021-04-07
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1/1
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103
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A change in relationship

Summary:

When Yuan came back to his senses he wanted everything that had happened to be a dream; so when he opened his eyes and saw that he was in a dark cell he shut them tight again.
It couldn’t be real… Gin could not have betrayed them.

Notes:

This fanfiction is an au of my own original characters, I wanted to write some smut so here I am.

Maybe I'll write more in the future.

Work Text:

When Yuan came back to his senses he wanted everything that had happened to be a dream; so when he opened his eyes and saw that he was in a dark cell he shut them tight again.
It couldn’t be real… Gin could not have betrayed them.
The day before Yuan had woken up earlier than usual, excited for the last rounds of the tournament, and the Award ceremony; he had tried to do his best to show off to Issei and his brother so he was sure that he’d win at least something.
‘‘Ge, are you ready to go?’’ he’d even woken up before his brother, all excited at the prospect of having a good day. ‘’Yes, Yuan, I’m ready. Now stop spreading your stupid pheromones in my room please.’’ With a laugh Yuan had left to get the horses ready, unaware of the dark look coming from Gin.
But what happened wasn’t what he expected to happen.
Everything had been normal until the ceremony. He had won first place in archery and the winners would have the person who won second place award the their crown so he was standing proud in front of his brother when everything went wrong.
‘’I won, ge, are you proud of me?’’ Yuan said, with a big smile on his face; when he heard no reply he opened his eyes and his brother was staring at him, a scowl on his face and a dark light in his eyes.
‘’Ge… what...’’ unexpectedly screams started spreading in the room, and demons started to appear seemingly fom nowhere, wounding the participants of the ceremony.
The attack had started from the middle of the crowd looking at them so the demons were still far from them but every alpha in the fighters section had unsheated their weapons and gone to fight and protect the others, while the omegas were organising the excape route.
Yuan didn’t esitate either, his attention diverted from his brother, and started to move to follow the other alphas; but a strong pulling force on his wrist stopped him.
‘’Ge, what are you doing? We have to go, they need help!’’ Gin didn’t say anything, but his grip became evn stronger, not allowing Yuan to get away from him.
Suddenly even more demons appeared, this time near them.
Yuan still couldn’t move or do anything and started to unwillingly emit distressed pheromones ‘’Ge, ge, please let me go, we have to move! Please!’’
Apparently Gin had been waiting for this moment because this time he spoke, voice full of mockery ‘’What, A-Yuan? The next head of the family, the mighty alpha of the Kuroyama can’t break free from his ‘beta’ brother’s grip?’’ ‘’What?... Why?... You’re my brother, what is happening?’’.
Yuan had already noticed that something was wrong. His brother hadn’t moved and hadn’t taken out his sword for protection, yet, no demon was approaching them but they were deliberately avoiding them. But he couldn’t believe that his brother was colliding with the demons.
‘’Didi (younger brother) haven’t you already figured it out? It should be obvious even to a stupid guy like you now.’’ The betrayal in Yuan’s eyes was such a lovely sight for Gin; he had been waiting to see this for such a long, long time; but what had to come would be even sweeter. He let his demon sigil show up on his forehead, and his own alpha pheromones started to pollute the air around his brother. ‘’What... This… Ge… no, this can’t be real’’
Yuan was panicking, Gin’s scent was way more dominant than his own so it was painful to stand and after a while he just fainted.
‘’Good Yuan, sleep, we’ll have our fun once you wake up.’’
Yuan still hoped that everything had been a dream but that hope was totally crushed when two demons came and opened his cell. Behind them was a female demon, who was obviously some sort of doctor, she did not say anything to him and just took his wrist, just as his normal doctor would do when they examined him. when he tried to struggle he found out he could’t use his powers, the chains on his wrists probably had some sort of sealing ability.
She didn’t even acknoledge his pathetic attempts and just kept on examining him, at the end she took a vial with a misterious liquid and tried to feed it to him.
‘’What’s this? I’m not gonna drink anything you give me!’’ he tried to resist but it was useless. Still not having said anything the demon doctor left, and Yuan was once again alone.
Yuan didn’t know how much time had passed but suddently he was taken out of his cell from another pair of demons and led into what once was the throne room. His wrists were bound on chains that came down and he was left alone; but not for long.
‘’Ah, hello didi, how are you feeling? I hope the cell wasn’t too uncomfortable for you.’’ Yuan looked towards the direction the voice was coming and he saw Gin. He was very different; his hair was left unbound and at the center of his forehead a red demon mark was shining brightly; his clothes were also different, way more elaborate that what he had been wearing in his time with Yuan. ‘’Gin… what are you doing? Why am I here?’’ his voice was soft, barely a whisper.
‘’Ah, so I’m not ‘ge’ anymore? Didi… you hurt me.’’ His tone was obviously mocking so Yuan didn’t answer, and just moved his eyes to the pavement.
‘’Well, it wouldn’t be fun later if you didn’t know everything so I will tell you.’’ Yuan’s heart skipped a beat when he heard ‘later’ and his eyes went back to his brother, a smirk telling him that was exactly what Gin wanted.’You see, Yuan, my mother apparently had demon blood within herself so I was able to awaken it; but that’s not why I allied myself with them. They just made me an offer I could not refuse.’’ While talking he had started slowly walking, getting nearer Yuan.
‘’All this years I had to pretend to be a beta, just because our father didn’t want an illegitimate child to be a stronger alpha than his heir. Me being taller and stronger than you was not acceptable if I was an alpha but it was allowed as a beta; that’s why he made me take repressants all this years, while you were allowed to do whatever you wanted; you didn’t even bother to learn how to control your pheromones.’’ Yuan was scared, Gin was so near that he could touch him.
‘’So, when the demons found me and I was held as a general because of my secondary gender I found out a couple of interesting things. Demons are in general more dominant than a normal person, and alphas… have a couple of special characteristics compared to humans.’’
Gin had been emitting his pheromones since the start of their conversation, very slowly, and now his scent had started to fill the room. Yuan couldn’t avoid smelling it and his own body started to emit his scent; only, it wasn’t his scent.
This was a sweet smell, with notes of peach and strawberries; completely different from his normal scent, a mix of iron and jasmine.
Yuan started trembling, he had understood what his brother’s was trying to say.
The slight change in his brother didn’t go unnoticed by Gin and he moved behind Yuan, touching his scent glands.
‘’I see you have started to understand. Demon’s alphas can trigger a process in human’s non dominant alphas that will turn them into what their natural gender should have been.’’ Yuan let out a small voice, cracking in the middle of the sentence. ‘’The doctor’s medicine…..’’
Gin laughed ‘’You see, you can be smart when you want to! Well, that wouldn’t be enough obviously but, with the help of my pheromones... You are now an omega! Just like you should always have been!’’ Yuan was crying, tears streaking his warm cheeks. ‘’Awww don’t cry didi; you should be happy! This is what you where meant to be from the start. Now, to make this really permanent…’’
‘’NO! No! NO! You can’t do this!” Yuan started desperately struggling against his bonds, trying to break away from the chains but it was utterly useless.
Gin laughed as he tore Yuan’s clothes apart, leaving him naked attached to the chain.
‘’Ah, didi, you have omega’s pheromones now; but for it to stick you need a dominant alpha to knot you, luckily for you, I’m here.’’
His hands moved to his brother’s hips and he started kneading the naked flesh there, laughing at Yuan’s attempts to make him stop.
Yuan was panicking, this was wrong, so wrong. Suddenly he felt a hard thing poking his leg and he started struggling even more, but to no avail.
‘’Careful, A-Yuan. If you don’t stop I will not wait until you’re ready to shove my dick into your hole. And I can promise you, it will hurt.’’
Hearing this words, Yuan stopped moving, and tried pleading with his brother ‘’Gin, ge, you don’t have to do this. Please, please, don’t do this. I’m your brother’’ warm tears were rolling down his cheeks but it only aroused Gin more. He had always dreamed of ruining his brother, such a useless alpha compared to him; there had not been a day he hadn’t thought Yuan would be much better off as an omega, his omega, to push down and obey his every order. Yuan was too soft to be an alpha.
Gin’s scent meanwhile had been working and Yuan could feel something dripping between his legs; to his horror he realised it was slick.
Without ceremonies Gin shoved a finger inside his brother’s hole, it was tight, so tight and so warm; at this point Yuan was still only whimpering, the sensation being completely foreign to his body.
When he felt it was all right, another finger joined the first and Yuan started to cry even more, trying to held back any sound of pain.
‘’Didi, I’m sorry if you feel this is painful. Just wait a second, I’ll find your switch soon.’’
He hadn’t even finished the phrase when he felt a bump on Yuan’s inner walls and when he touched it he could feel his brother tense up. ‘Found it’ he thought.
Yuan’s mind froze. When his brother had touched that weird spot inside of him everything in his mind had gone blank, making him feel almost good. He didn’t like that sensation.
‘’Well, time for the main event I guess.’’ Gin finally freed his throbbing erection from his pants. His dick was a textbook example of how an alpha’s cock should look, big and hard; Yuan’s couldn’t even compare, but he already knew that, from its size one would have tought it belonged to a beta and now, after the medicine, it had shrinked up even more, not even coming to a third of Gin’s dick lenght.
Yuan could feel his brother’s hard cock on the inside of his ass cheeks, prodding to enter. ‘’Gege, please please don’t! It can’t fit, there’s no way it will fit!’’ at this point he was screaming, in complete panic
‘’Yuan, Yuan, you should trust your older brother more. Your new body is made for this, just relax.’’ And without waiting anymore, he shoved his dick inside his brother’s warm hole in one go. Yuan felt like all the air inside his lungs had been sucked out, and he passed out for a bit. When he came to he could feel his insides being stuffed completely full, and to his horror he could almost see the dick’s shape on his stomach.
‘’I see you’re back with me, I’ll start moving then.’’
Sparkles started to fly in Yuan’s mind as his brother started moving inside him, targeting that special spot inside him; without wanting it his own dick came to life, straining against his abdomen.
‘’Aww, such a cute little dick. It fits a cute omega like you A-Yuan.’’ His brother had started moaning while sobbing, no longer able to cover up his arousal.
Gin’s cock became harder and his thrusts increased in speed, while the base of his dick started to swell, preparing a knot to join them together.
‘’A-Yuan, didi, we’re gonna be joined together soon. In a moment you’ll feel the real joy of being an omega.’’
With the remaining part of his conscious brain Yuan tried to ask what Gin meant but no coherent words came out of his mouth, only other moans.
Chuckling, Gin explained ‘’As soon as I knot you you’ll experience your first full omega orgasm, didi. Now, take it.’’ and with a last strong thrust the inflated base of his dick got sealed inside Yuan, pocking that spot that kept making hime feel good. Unable to resist the wave of continuous pleasure washing over him, Yuan screamed and passed out.
Gin laughed as his seed poured inside his brother, and he licked his scent glands, making sure not to bite down on them. After 20 minutes he managed to get his dick out while his brother still hadn’t regained consciousness, hanging from his chained wrists.
As soon as he had finished he called over his personal guards, ordering them to bring his brother in his chambers, no restraints would be needed anymore because with his heat triggered there was no way he’d be able to do anything anyway. In the next few days he would only be thinking of ways to get filled, Gin would probably allow some of his most trusting men to play with his brother. After all, he was busy, and he wasn’t so heartless to let yuan suffer during his first heat.
As his brother was carried away a satisfactory smile appeared on Gin’s lips; he couldn’t wait to play again with his new omega.