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My Adopted Sister is My Mate
My Adopted Sister is My Mate
Author: Kaosyn Isolde

CHAPTER 1

Author: Kaosyn Isolde
last update publish date: 2026-01-03 20:53:16

KAEDEN

15 years.

It has been 15 years since I left. Since I ran away from my pack in a desperate bid not to turn into my father. And now, I’m back.

I was 18 when I left, filled with rage and cold bitterness. And a year prior, I had begun to unravel mysteries about my father’s rule, about why the magick creatures, the witches and the elven folk were slowly disappearing, about my mother.

Anyways, when it was time for me to get tertiary education, I decided that I was going to use it as an opportunity to run away, to train, to make myself stronger than my father and then come back to hold him accountable for all the evil that he committed under the guise of being the most just Alpha there ever was.

And now, I’m a man of 33, of the sacred age when an Alpha’s heir is to rise up to the ranks of Alpha whilst the previous Alpha settles into the role of regent. Now is the time.

I have but 5 months until the blood moon, after all. And the blood moon is when I am to ascend to the throne.

I stare at the silver, washed out gates of the Silvermoon Park, watching them groan like a dying beast as the guards pull them open. I lean back to where I am seated at the back of the black SUV, letting my eyes wander to the towering ancient oaks that line the driveway, to the fountain centering the entrance.

My wolf, Fenris, paces restlessly behind my ribs, filled with excitement and anticipation. A wolf always yearns for home, and I have denied him the pleasures of home for far too long. He lets out a soft growl and I sigh.

“Down, boy.”

As I step out of the car, a hot wave of what seems to be agitation settles on me, but I shake myself back into place. I have nothing to fear.

My father is but a man. And I am stronger than him. The scars mapping my body detailing the tales of the decade I have spent in the brutal northern territories can account for that.

A floor guard glances at me and recognition instantly hits him. Before I can speak, he immediately ushers me in and mutters something about informing my father. As I would expect.

I enter inside and am nearly dazzled by the sheer and blatant display of extravagance at the interior. The Silvermoon mansion has always been extraordinary, the pride of the wealthiest pack in the world. But this, this is something else. It seems that in the past 15 years, my father has accumulated three times the wealth we already had. The entire place is so riddled with gold and priceless jewels and expensive paintings and sculptures that it almost hurts to look at.

“Comfort” Fenris sighs.

“No, greed.” I snap back.

Fenris hisses at me. He has never truly forgiven me for the hell that I put him through for 10 years at the Northern territories. He is too aware of what he is, an Alpha, deserving of comfort and riches and splendor, and we… we do not always share the same view on things.

The floor guard comes in. “He is waiting on the porch.”

Before I get to the porch, I can already smell his scent of cedarwood and expensive scotch.

Silas Vane. After 15 years.

He stands on the marble steps, his hair silvering perfectly at the temples, wearing a bright white suit, looking every inch like the image he has carved for himself. The perfect Alpha.

A fraudulent bastard.

I force my lips into a tight smile as he descends to meet me, with a smile that would have looked cheery if it met his dark, malevolent eyes.

“Father.”

“My son. You’re back. The prodigal Alpha, back to where he belongs. Back home.”

Not yet. Here is not yet home to me.

He gives me a forced embrace, stifling me with his scent. And as he does so, I cannot help but notice that I am now taller than him, with broader shoulders, thicker arms, denser muscles.

He is still a very strong man, has barely aged, but I am stronger. Much stronger.

He takes his hands off mine and looks at me, still smiling. But I notice there is a tightness to his smile.

He noticed the physical differences too.

 “You have been gone for so long. So long. What has it been, 15 years? I almost thought you for dead. I was so worried.” He steps closer. “And if you hadn’t come back this year, I would have declared you so.”

If he cared enough, he would have searched for me. But he never did.

“Well, I’m glad that you recognize exactly why I am here. Let’s not pretend that this is a family reunion, Father. I am here strictly for the succession.”

Silas’ smile refuses to falter, though his eyes hardens. “I never understood exactly what I did to you. Especially given the fact that I have done everything to usher you into an easy and glorious reign. Everything I have done, I have done for you.”

I refuse to tell him how much of a lie I know that is, of the news I have heard of his desire to rule for longer, of his exploration into the dark magic in a bid to gain immortality.

Everything that he has done, he has done for himself. So that he can rule forever.

And he is deeply unhappy that I have returned.

A sweet smell suddenly overwhelms my nose, of vanilla and wild berries and storm clouds.

I feel Fenris ears perk, his fur bristle, and a soft growl fills my ears.

Goosebumps envelop my skin. What is going on?

“Ah, yes,” Silas says in a chirpy tone. “Avara, you can come forward.”

Avara. That name sounds familiar, like a name I have once heard, a name I know, but have not thought of in a long time.

And suddenly, I remember.

………………….

It was a night before my escape. I had a million and one things on my mind and definitely had no space in my mind to entertain any more things.

So when my father summoned me to the living room to meet who he said was to be my little sister, a small child of no more than 6, I could not be bothered to comprehend the gravity of what he was saying.

A human sister. The only question I bothered to ask was why the fuck he was adopting a human girl to be my sister.

My father cooked up a story that I instantly recognized as bullshit, as he always did. About how the girl was a victim of a rogue attack, how her parents died and he found her alone when he came for damage control, of how he found a fatherly bond between himself and the girl and instantly decided that he wanted to do nothing but to protect her for the rest of his life.

“Even though she is a human? You are to let a human bear the surname of an Alpha?”

“There is nothing wrong with being a human. Besides, it is not like she is to become Luna, she is just to take my name and my protection.”

It took me one glance at the little sobbing 6 year old’s bright green eyes to realize that she was definitely not a human. Not werewolf, but not human. I could not place what she was but my mind was too preoccupied to think too much about her.

And I had dismissed her as a political prop, and nothing more than that. Greeted her, consoled her, told her I was her brother, then hurried away to continue packing up.

……………………….

Now, I feel a bit of guilt that I haven’t thought of her in the past 15 years. Not even once. I should have written to her, tried to form a connection with her.

She is my sister, after all.

Avara steps in and my breath ceases for a second. She looks ethereal, still with the bright green eyes, pale skin, black hair in waves cascading to the back of her waist, a wearing a soft cream gown that makes her look pure and innocent and almost out of this world.

My sister, I tell myself, almost as a warning, but for some reason, Fenris is going berseck and the sweet smell has become dangerously stronger, as if coming from her.

A blonde, easylooking wolf of about the same age as she is walks behind her and for some reason, I feel unease at the way he smiles at her, the way he holds her waist, the way she leans into him. I look at him and can almost detect a cruelty mirroring that of my father.

“I’m glad that you are here, Avara. Kaeden meet the person who has become the lady of this home whilst you were playing soldier in the dirt in God knows where, your sister, Avara. You remember her, right? I introduced her to you the night you left. Oh and her boyfriend, Julian.”

Julian speaks first. “Welcome back, Kaeden, Alpha heir.”

“Julian… Julian?”

“Thorne.”

Thorne. Son of Cassius Thorne, Beta of Silvermoon. What a delectable match.

That sweet smell hits my nose like a storm again and forces my attention back to Avara, who stares at me with a strange expression on her face. Not a smile, not a frown, almost calculating. That look inadvertently brings a smile to my face. With that gown of hers, she almost looks like a bird in a golden cage, but I see fire in her eyes. Which tells me enough.

She finally moves close to me. “Hello Kaeden.”

Her voice completely contrasts the fierce expression which she has carefully tucked away. It’s soft, like velvet over glass. Fenris perks up again, basically panting. It’s an uncomfortable feeling, being around her, knowing who she is and feeling… well, feeling the way I feel.

“Avara. You were just a child when I left. But look at you, a full grown woman.”

“Yes,” she sighs and I swear that there is a bit of disdain in her voice. “It has been a while.”

I stretch out my hand to give a cold, formal handshake, already ready to leave and process what is going on with my body.

She reaches for it.

And the moment our hands touch, the world tilts.

An electric shock bolts up my arm, searing straight into my chest. I feel a sudden, violent alignment, as if something deep inside me has snapped into place. My vision blurs and swarms with gold.

Fenris surges, his sharp claws raking inside of my chest, and lets out a deafening, blood-curdling howl and shakes me to my marrow.

MATE

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  • My Adopted Sister is My Mate   CHAPTER 71

    KAEDEN“So... the moment of truth. After so many attempts at trying to get you to listen.” I laugh, trying to make the atmosphere less intense, really more for me than her.Because the truth about her origins and Silas plans are not the only things I intend to reveal to her tonight. I also very much intend to reveal that well, that she’s my mate.And I don’t even know how to begin.She laughs too. “Yeah, well, I really was a stubborn little shit, wasn’t I? And I would have saved myself a truck load of trouble if I had just listened from the start.”“Don’t blame yourself. You barely knew anything about me other than what my father must have told you. You had your rights to be suspicious.”“Oh, but I do. The signs were all there, glaring, really. But I let myself be deceived and gaslighted and lied to and now I don’t even know truth from deception anymore.”She sighs and I feel my heart ache for her, for all that she has been put through. And underneath the aching remains that relentle

  • My Adopted Sister is My Mate   CHAPTER 70

    JULIANI lean beside the oak tree at the training courtyard, watching the disaster subtly brewing. I don’t want to be here. I don’t want to have to co-lead a war that will surely end in my death, given the display that Kaeden showed, how so easily swooped in and took Avara, the magic he had at his disposal, one rivalling and easily defeat Silas’... magic?I wonder how no one has talked about it yet. About how the Alpha could shoot fire and dark tendrils of smoke off his fingers, dark tendrils that looked suspiciously like dark magic.But I guess that everyone else has something more dastardly on their mind. Just like me. And what is on my mind at the moment is the fact that I do not want to be on the losing side. The wrong side.My father hisses as he comes to my side. "Look at them," he hums, though his voice is like a razor. " because a single Gamma was found wanting."I look. The warriors are lined up in uneven rows, their shoulders hunched, murmuring, subtly resisting.Well, no sh

  • My Adopted Sister is My Mate   CHAPTER 69

    AVARAThis place is... beautiful.I look around at the trees, the birds, the wild flowers. I have not been in such a beautiful place for as long as I can remember, and I almost feel tears welling up in my eyes.I take a deep breath. Yep. Smells like freedom.“This place is beautiful, isn’t it?”I turn around. Kaeden is behind me, his hand finding it’s place at the base of my back. He looks down at me and smiles brightly.“It is.”“Well, great to know that you’re finally steady. I’ll need to show you around.”“Is... is this where you’ve been hiding? All those years?”He laughs. “Oh, well, this is part of it. But I couldn’t possibly stay in one place, not if I needed to extend the allies I was gathering, especially not with my father’s assassins after me.”“Silas sent assassins after you?”“Surely by now you know what sort of man he is. What he can do.”“I do.” I go silent, the memory of the horrors that I went through before Kaeden whisked me away flashing before me. I shiver. “I’m so

  • My Adopted Sister is My Mate   CHAPTER 68

    SILASI’ve been mostly locked in my office, thinking, recalibrating, restrategising.And also, very much so, beating myself up.I do not take losing easily and this is my biggest loss yet.Perhaps I have wasted some time over the days of brooding instead of making advancements. However, I do know that Avara is was in too bad of a shape when Kaeden took her to be in perfect health at the moment, no matter how many witches Kaeden has in his disposal and uses in an attempt to get her to recover.Dark magic doesn’t fade easily. And perhaps it has gotten me some time.Anyways, right now, my head is clear. And it is time to start making movements. I’ve thought up several extreme measures that I will take to recover my harvest, and now it is time to start from the basics.I ring my call bell."Cassius."The door opens. Cassius enters first. Julian follows, and I read him immediately, pale beneath his composure, still looking gobsmacked and shaken by the events of that night.“It’s been three

  • My Adopted Sister is My Mate   CHAPTER 67

    KAEDENMy jaw tightens.“Do not think we have not already deciphered this, Kaeden,” Maereth says, “But we would much rather like to hear it from your own mouth.”"She's..."The word catches.I exhale."She's nothing," I say.The lie lands in the air and sits there and immediately, comprehensively fails to convince anyone in the vicinity, including me.Dolores raises an eyebrow. “Nothing?”"She's..." I stop. Try again. "It's complicated."I look at them with imploring eyes, desperate to run as fast as I can from this conversation, but none of them budge. It takes a long time of just staring and hoping against hope that they bore of the conversation before I sigh and finally give in."She's my mate." I finally grit out. “The Moon saw fit to tie me to her. Are you satisfied?"Fenris growls in satisfaction. I nearly snap at him.Maereth's expression softens. "There it is," she says. “For a moment, I feared that those words would not come out of your mouth.”Dolores raises an eyebrow. "The

  • My Adopted Sister is My Mate   CHAPTER 66

    KAEDENIt has been three days.Three days since I tore her from that altar, since I felt the weight of her in my arms and understood how much of her had already been spent.Three days of watching her breathe, watching the colour slowly return to Avara’s lips and the hollows of her cheeks fill out. Three days of Fenris pacing behind my ribs, a restless, silver tide that only settles when I am within arm’s reach of her.And I remain restless, desperate to be by her side, watch her recover, be there for her.I’ve tried to convince myself that it is because of the discussion that we need to have, because of the plans we need to map out, because I need her to get healed as quickly as possible so that we can begin working on undoing all that Silas has done to dispel her memories and block her abilities.But I know that it is much more than that. I just find it difficult to accept it because anytime I think in that light, let myself bask in my thoughts and feelings, the knowledge of the sacr

  • My Adopted Sister is My Mate   CHAPTER 30

    KAEDENI’m still panting when we make it back to the witch coven, my eyes wide open with shock, my head spinning, the dark voices that pursued us as we ran out of the Seculum still ringing faintly in my head.Myra has none of her usual flirtatious playfulness as we walk to the main meeting room in t

    last updateLast Updated : 2026-03-24
  • My Adopted Sister is My Mate   CHAPTER 29

    KAEDENYou would not believe that it is about the break of dawn, with the sheer darkness of this place. The darkness is so dense, it feels like it’s wrapped around me, suffocating me.We took too long getting here. Too damn long. I fear that my father may have finished his business and left.But to

    last updateLast Updated : 2026-03-24
  • My Adopted Sister is My Mate   CHAPTER 27

    SILASI descend gingerly into the Seculum, realising after long bursts that I keep holding my breath. It has been long since I’ve been here. About 16 years, to be precise. Any other transaction that I have had with creatures of the night have been at a location that I have chosen to communicate wit

    last updateLast Updated : 2026-03-23
  • My Adopted Sister is My Mate   CHAPTER 26

    AVARAI pause to take a deep breath in an attempt to soothe my nerves before I knock on the heavy oak doors of my father’s study."Come in," Dr. Scyla’s voice calls.I push the door open, expecting to see Silas behind his mahogany desk, perhaps nursing a glass of scotch. But the room is empty of hi

    last updateLast Updated : 2026-03-23
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