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I Didn't Sign Up for a Sister-Wife
I Didn't Sign Up for a Sister-Wife

I Didn't Sign Up for a Sister-Wife

8.9
/ 10
In the modern fantasy novel I Didn't Sign Up for a Sister-Wife, Jennifer's world shatters when her husband Harvey reveals he impregnated his widowed sister-in-law. Forced into a polyamorous arrangement by her in-laws, Jennifer must decide whether to endure the betrayal or use a mysterious system to escape this world forever.

I Didn't Sign Up for a Sister-Wife Summary

At their daughter's celebration, Jennifer faces a nightmare when Harvey McKinzie announces his sister-in-law is carrying his child. Orchestrated by his parents to preserve the family lineage, the betrayal is framed as a duty Jennifer must accept. As Lydia claims they are now sister-wives, Jennifer’s reality collapses. However, a long-dormant system suddenly reactivates, offering her a desperate chance to spend her points and abandon this world entirely.
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Chapter 1 of I Didn't Sign Up for a Sister-Wife

On the day of our daughter's full-month celebration, Harvey McKinzie walked onto the stage holding the hand of his widowed, heavily pregnant sister-in-law.

"Honey, to be honest with you—my sister-in-law's baby is mine."

His parents followed behind, looking completely unapologetic.

"We're the ones who made it happen. We drugged them. Our oldest son may be gone, but the family can't be without an heir.

"Harvey is taking on the responsibility of carrying on both family lines—it hasn't been easy for him. From now on, you need to take good care of Lydia and the child she's carrying."

The sister-in-law, now eight months pregnant, glanced at me shyly.

"Jennifer, we're sister-wives now."

I stood there frozen, holding my daughter, my voice trembling.

"Why are you doing this to me?"

Harvey frowned and let out a long sigh.

"You're always saying how hard Lydia has it, right? Isn't it better if I just take care of her openly and properly?

"I promise—you'll be the first wife, and she'll be the second. On paper, you're still my only legal wife."

In that moment, my blood ran cold.

Then, for the first time in a long while, I heard the system's alert in my head.

[Host emotional fluctuation detected. Would you like to use all remaining points to exit the current world?]

The last time the system had appeared was when I gave up on the main quest and chose to stay for Harvey's sake.

The price was my body breaking out in oozing sores and boils. I was in agony, barely human.

Back then, Harvey was busy traveling for work. I never said a word.

When I gave birth to our daughter, I had a hemorrhage so severe that even the doctors recommended terminating the pregnancy. I begged them to save the baby.

I spent a week in the ICU. My body still hasn't fully recovered.

I told myself it was all worth it.

And now, I find out that just as I got pregnant, my husband was already crawling into bed with his own brother's widow.

Disgusting.

'System... can I take my daughter with me?'

[No. That would violate the laws of this world.]

I was silent for a long time. Finally, I replied, 'Then take me out.'

The system flickered.

[Protocol initiated. Countdown: 24 hours.]

Harvey was watching me. He softened his voice.

"Listen, honey. Lydia's had it rough since my brother died. She's not here to tear our family apart—she's here to join it. Nothing's going to change how I feel about you."

It was as if he'd forgotten the day he got down on one knee and promised me, "You're the only one I'll ever love."

I dimly remembered Lydia coming over once. I'd poured her a cup of hot chocolate, just being friendly.

Harvey snatched it out of her hand and threw it in the trash. "She's allergic to chocolate," he said.

I thought he just had a good memory. I forgot that he'd never once remembered I'm allergic to strawberries.

His mother shot me a disapproving look.

"Jennifer, a woman needs to be gracious about these things. You couldn't even produce a son. Lydia is carrying the McKinzie family's first grandson.

"If it weren't for Harvey's kind heart—remembering all those years you've been together—by all rights, Lydia should be the first wife and you the second."

I clutched my daughter tighter.

And then, my daughter reached her little hand toward Lydia and giggled. She knew Lydia.

My whole body started shaking.

So while I wasn't looking, Harvey had already been bringing our daughter to meet her stepmother.

Harvey saw it too.

"See? Even Ellie loves Lydia.

"Tell you what—I'll spend Mondays, Wednesdays, Fridays, and Saturdays with you. Lydia can have the other three days. That's fair, isn't it?"

How ridiculous. I was supposed to be grateful that he was graciously allowing me to share my husband with another woman.

The man standing in front of me was a stranger.

If he really needed to take care of Lydia, there were a thousand other ways to do it. He chose the most disgusting one.

When he was lying to me all those months, did he ever think about me and our daughter?

A sharp pain stabbed through my heart.

"Forget it."

My voice was hollow.

"We're done."

Something clattered to the floor.

It was the ring he'd given me when he chose to give up studying abroad just to end our long-distance relationship. Back then, everyone said he was crazy. He just smiled and said, "My wife is where I belong. So that's where I'm going."

He'd made the ring himself. It wasn't worth much. But to me, it was priceless. I never took it off.

Now it lay at his feet, reflecting the shock on his face.

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