I Was Proposed to by an Unknown Duke After My Sister Stole My Fiancé

I've always had mixed feelings about my younger sister since I was a child.

 

But ever since she cuckolded my fiancé, I've been filled with miserable feelings that I want to die every time I see her.

 

“I'm really sorry, big sister.
But I've always, always wanted him!

 

“William took my hand, but I know that you love him, big sister.

 

“I want to keep getting along with William, but I won't take him away from you, sister! So, so you'll forgive me, won't you?”

 

I couldn't forget her high-pitched voice that oozed an overwhelming sense of superiority.
My face twisted in contempt, and a nauseating feeling swirled inside me.
I couldn't understand anything my sister was saying.

 

Did she seduce and steal my fiancé, even though she knew I liked him? And now she was begging for forgiveness with the lips that seduced someone else's fiancé? Give me a break!

 

But what made me even more frustrated was that I couldn't say anything back.

 

(Not take him away from big sister? Of course, that's right.)

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My sister only had an interest in other people's things.
I recently found out that this fetish applied to humans too.
The more someone treasured something, the more they wanted it.

 

In other words, for my sister, what was more important than anything else was that I had feelings for my fiancé.

 

She wanted him because he was “my fiancée,” and I was sure she would lose interest in him the moment he became hers.

 

It was a feeling I couldn't understand at all.

 

“My name is Olivia Rosebery! Um, you're Duke Ilvis Lambert, right?”

 

My sister, whom I hadn't seen properly in a long time, seemed to be in better health than before.
She must have felt good seeing me so beaten down.

 

“Oh, you're back from your morning walk, Olivia.”

 

My sister looked as if she had just returned from outside.
In fact, she had just arrived, but my mother quickly made up an excuse before my sister could say anything strange.

 

Well, for a young lady with no fiancé, returning home in the morning would be nothing but scandalous.
If that was the case, I really wanted them to handle the matter with my fiancé urgently.

 

With a cold feeling, I averted my gaze, thinking that my sister would probably follow this advice.
But then, I saw something unbelievable.

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“I never thought I would be able to meet you, Duke, in my own home! What a wonderful day it is today!”

 

“Oli…via…”

 

I couldn't even utter the words, “You're lying.” They were stuck in my throat.

 

Her hungry, animalistic gaze was fixed on Ilvis, and she was blatantly fawning over him.
Her dress already boldly revealing her cleavage, she emphasized it even more by drawing closer to him.
Her voice, already annoyingly high-pitched, became so high that I wanted to cover my ears.

 

I felt my cheeks twitch with disgust.

 

My sister, who had so adamantly declared that she wanted a fiancé as much as I did, now seemed to have set her sights on Ilvis.
She was still smiling sweetly, but perhaps she was already making plans to win him over.
No, there was no doubt about it.

 

Her scrutinizing gaze, like she was judging him, revealed her true intentions.

 

Ugh, it was so creepy.

 

I felt a wave of apology and disgust wash over me, and I wanted nothing more than to faint right then and there.

 

Honestly, I wanted to run away, but I was the one who had involved Ilvis.
I couldn't be so irresponsible.