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Pregnant Sister Sex Stories Novels & Stories
Pregnant sister sex stories explore forbidden desires with a taboo twist, blending family tension with raw, risky passion. The best ones balance emotional stakes against the thrill of crossing boundaries, leaving readers torn between guilt and arousal. You’ll finish these books with your pulse racing and your morals deliciously blurred. GoodNovel knows exactly how to tempt you with the stories you crave but won’t admit to aloud.
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My Sister’s Fiancé
As if everything that had already happened wasn’t enough I had to gave him again at the celebratory buffet and I couldn’t decline the invite because it was my sister….
The next event was even bigger than the engagement party.
A celebratory buffet my sister insisted on hosting, something about “bringing both families together properly.” It was elegant, controlled, perfect.
Just like her.
And somehow… I was there again.
Dressed up, smiling when necessary, pretending everything was fine.
Pretending I wasn’t falling apart inside, but I kept my distance this time.
349 viewsOngoingAdded to Library 9 Times as pregnant sister sex stories
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A Ruling Passion: Mr Tremont's Priceless Little Bride
“Everything worked just as my sister had planned. She drugged your father, who knew not a lick about this. He thought he had had sex with a B-girl by accident. Of course, some stranger seized that confusion and dissembled herself as this ‘unfortunate B-girl’, and ironically? It worked to that hag’s favor because they soon had a son afterward, who grew up to become that bastard who survived to this day. My sister had exhausted all of her wits to her most deplorable end, and yet she still couldn’t win the heart of a genuine piece of sh*t.
“After I was pregnant with you, my sister stayed at home, watching my every move, frightful that any regret I bore would turn me to abort you. She had reject
91.5M viewsCompletedAdded to Library 47.9K Times as pregnant sister sex stories
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Pregnant for the Wrong Stepbrother
Vivian, my best friend and unofficial therapist, pulled me into a tight hug, her arms wrapping around me like a security blanket as she caught the defeated look on my face.
“Awwn, I’m so sorry, hun,” she whispered, brushing my hair back. “Your mom’s drowning and grabbing whatever she can to keep you both above water. I doubt she actually wants this for you.”
I swallowed hard, forcing down the lump rising in my throat as I tried to keep my tears at bay. Susan—Vivian’s cousin and our unofficial big sister rubbed my back in slow, quiet circles, her nails cool against my cotton blouse.
102.6K viewsOngoingAdded to Library 79 Times as pregnant sister sex stories
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Sinful Desires: My Uncle Is Mine
KRISTEN
The thought of June's father brought back a barrage of emotions—emotions I thought I had scaled.
"My sister was in her third year in college when she got pregnant, and I wasn't aware..." I started, my mind running back in time. Edith listened with rapt attention. "Before that, I had always thought that nothing could go wrong. My sister was in college; my business was flourishing. What could have gone wrong?! But it did. I learned of my sister's pregnancy after June was born."
10400.5K viewsCompletedAdded to Library 10.4K Times as pregnant sister sex stories
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Mr. President Has A Baby Bump
“That my little brother is fucking pregnant? That somehow, against every ounce of logic and science and common fucking sense, you ended up carrying a child?”
She took a step back, shaking her head. “Jay, if this shit didn’t happen to you, if I wasn’t watching your stomach grow and hearing you puke every other morning for the past few days, I wouldn’t believe it either! A man. Pregnant. My brother. A man with a fully functioning dick is the one sitting here, throwing up his guts and craving ginger tea like some goddamn fairytale.”
Her voice cracked again as she stared at me, helpless. “How the hell am I supposed to explain that to Lisa? How am I supposed to say this isn’t cheating, this is ju
1045.1K viewsCompletedAdded to Library 1.4K Times as pregnant sister sex stories
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Reclaiming Celeste: A Contract Marriage for Revenge
"I saw you! You put your hands on your pregnant sister and shoved her!"
"I didn't! She was blocking the top of the stairs, telling me about—" I stop myself, but it's too late.
"Telling you what?" Christopher demands, moving away from Vivienne to step closer. His handsome face, the one I used to trace with my fingers in the dark, is flushed with anger. "That we're having a baby? That's what set you off?"
My pregnant sister.
We're having a baby.
The words make my stomach turn.
"She didn't just tell me," I say, and I hate how my voice shakes. How small I sound. "She was rubbing it in my face. Laughing about how you were sleeping with her the whole time we were together—"
861 viewsOngoingAdded to Library 17 Times as pregnant sister sex stories
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The Wet Diãry
she whispered to me, "One of my fantasies is to be impregnated by my little brother, so that's what we're going to try now."
The thought of fathering my sisters child disgusted me, but my body betrayed me once more as the thought of having sex was enough to get the blood flowing in my penis, as it stiffened up, ready to be put inside my sister. She shifted her way back down my body slowly, until I could feel the tip of my dick press against her underside, which was now so stiff it was pointing directly at it. I then noticed Tia had no panties on under her revealing lingerie, and I noticed how wet she was getting as she got up to start grinding along my shaft.
743.0K viewsCompletedAdded to Library 1.7K Times as pregnant sister sex stories
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Dangerous Pleasures
"If we keep doing this, you know, this way, you're going to get pregnant. That can't happen."
"You're right, It can't."
Now it was my time to give her a dubious look. I ran through all the possibilities of what she might mean and came up empty. As far as I knew, going bareback with my sister was as unsafe as any other woman.
"It won't happen," Betsy said, so firmly I almost believed her. "Brothers and sisters can't have babies. So we won't."
"We very much can if we're not careful," I said.
1048.6K viewsOngoingAdded to Library 972 Times as pregnant sister sex stories
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Dirty Family Secrets
I exclaimed breathlessly.
My sister didn't slow her grind. "Yesss," she said hotly, and her mouth remained open so she could breathe harder. Forward and back her hot, sexy body slid, riding my cock through my sweats. Her moans grew in pitch.
My mind was reeling from this new revelation. Well, that and from the fact that my sister was about to make me cum. Struggling to get my words out, I said, "Are you telling me... our mom fucked her brother and... got pregnant?"
1034.4K viewsOngoingAdded to Library 1.1K Times as pregnant sister sex stories
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Read Pregnant Sister Sex Stories Novels & Stories Online
Here are 100 novels related to pregnant sister sex stories for you to read online. Generally, pregnant sister sex stories or similar novel stories can be found in various book genres such as Romance and MM Romance. Start your reading from My Sister’s Fiancé at GoodNovel!
Frequently Asked Questions
Romance novels with the 'pregnant with my brother's best friend's baby' trope usually follow a wild emotional rollercoaster. The setup is juicy—imagine the tension when the heroine realizes she’s carrying the baby of the guy her brother probably trusts more than anyone. There’s this inevitable clash between loyalty and love, with tons of angst, secret pining, and maybe even a dramatic reveal where the brother finds out. Some stories lean into the forbidden aspect, making the relationship feel electric but risky, while others focus on redemption arcs where the best friend proves he’s more than just a mistake.
The dynamics are super fun to explore because you get layers of conflict—family drama, unspoken feelings, and the pressure of an unexpected pregnancy. Some authors spin it into a sweet second-chance romance if the characters had a past, while others go full-on enemies-to-lovers if the brother’s best friend has a reputation. Either way, the baby usually becomes the glue that forces them to confront their feelings, and the brother’s reaction? Chef’s kiss for drama. I love how these stories balance heartwarming moments with messy, real emotions—it’s like watching a soap opera you can’t pause.
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