Best Step Brother Romance Books

She was always the good girl. Until heartbreak made her reckless. Elena Sinclair thought marriage meant forever. But five years in, her “forever” has become a gilded cage of pain and betrayal. She’s the wife who couldn’t give him a child. The barren disappointment. And for that, her husband offered her a cruel compromise… an open marriage. One that gave him the right to find someone who could carry his heir. The next day, he brought a pregnant woman home. The same woman who was first introduced as his cousin. The humiliation doesn’t end there, his mother lashes out… hurling insults and even fists, while her husband turns a blind eye. Not once has he defended her. Not once has he shown her love. She’s nothing more than a placeholder… a name on a marriage certificate. The cruelest part? She loved him. She loved him long before the vows, long before the lies… so deeply it blinded her to who he really was. Now, to make him jealous, she turns to the one man she should never touch: Jaxx Moretti, her husband’s younger brother. The dangerous one. The black sheep of the Sinclair family. The man who once made her high school years hell… and now has every reason to destroy her husband's legacy. What starts as a twisted game soon ignites into something raw, addictive, and completely forbidden. But Jaxx isn’t just her escape. He’s everything her husband isn’t. Because the deeper she sinks into Jaxx's bed… The harder it becomes to crawl back out. Content Warning: This book contains mature themes intended for adult audiences (18+), including explicit sexual content, toxic relationships, manipulation, and emotional trauma. Reader discretion is strongly advised.

I made a mistake that could ruin me. I fell for a man I should’ve feared. At sixteen, I was drawn to him like a moth to a flame. Gianni Rossetti. My best friend’s father. A ruthless billionaire. A cold-blooded villain. A man twice my age, who could destroy me with a single look. For years, I was nothing to him—a silly girl with a foolish crush. But I couldn’t forget those icy blue eyes, the way his presence made the world feel small and dangerous. By the time I was twenty-one, I knew I should’ve walked away, left my fantasies behind. But then, one night, Gianni noticed me. And my world turned upside down. He didn’t just see me—he ‘claimed’ me. Every forbidden fantasy I’d ever had, he brought to life. He touched me, possessed me, made me feel things that shattered everything I thought I knew. With him, I wasn’t just a woman; I was ‘his’. But the deeper I fall, the darker it gets. Gianni’s world is filled with secrets, shadows that whisper of violence and betrayal. His past is more than just a dark history—it’s a deadly curse that threatens to consume us both. I knew he was dangerous, but I never imagined this. Now I’m trapped, caught in a web of desire and deceit, and the deeper I go, the harder it is to find my way out. But the worst part? I’m not sure I want to escape. Not if it means losing him.

I kissed my brother in the darkness, my brother Easton, the one who will be the future alpha of Silver Peak pack, the one who was loved me but now hates me.....

(Annular Eclipse 2) "How would you feel if you woke up and found yourself a wolf? Then, you also woke up to know that you have a twin brother, and he is the hottest in the pack?” On campus, Winter Smith immediately catches the eye of the campus queen bee, Marah Brown. When a particularly nasty prank finds Winter bound and abandoned to the dark woods, she's found by reclusive she-wolf Hannah Damore, harboring secrets of her own. Bitten by Hannah, Winter is propelled into perilous new world, reshaped by the exceptionally rare and powerful "Eclipse Essence," which not only changes her appearance but erases her memories and sends her searching for her missing identity. Rescued by Alpha Alph Damore and brought in among the Hadson Pack, Winter comes to meet Hadzen Damore, Hannah's twin brother. The resemblance in looks and countenance is there, yet Hadzen has a hard time fully believing Winter, who is still haunted by unresolved pain and uncertainty about her identity. Will they be able to overcome the cold estrangement and fire up their desires while the tension builds? Maybe they could find a way to embrace the power of an eclipse and face an impending threat, or would the very fire inside them devour all they held dear?

Stepbrothers Alex and Brian hide a forbidden secret—they’re fated mates. Trapped between family expectations and their undeniable bond, they must face the truth, defy the Pack’s rules, and fight for a love the world says they can’t have. In the Omegaverse, fate doesn’t care about bloodlines………

"This doesn't make sense," I whispered, my hand on the door knob. "We can't tell mom and dad," he whispered back into the darkness. "You can't be my mate!?" I hissed back, "You're my brother." "I'm not going to resist the sparks, April," he growled, "or the pull, and feeling of want... Do you hear me?" "W-what?" "I want you so bad it hurts," he whispered. It was like my lips moved and spoke for me. "Then take me." His warm lips smashed onto mine, finding them in the dark. Sparks lit the tiny closet up, and suddenly I knew where he was, almost as if we were in a room full of light. I could see every move he made, and I wanted him to make a move on me. I kissed him back with force and longing. My first kiss is with my brother. My mate

Bullied Irina is almost eighteen and cannot wait to leave the pack. She has spent her life living as an omega for all these years, keeping her heritage a secret from those around her When a strange man brings her mother home one night, Irina cannot get his scent out of her head, only to discover that he is her half brother, the man that she was never supposed to meet because the Moon Goddess had decided their fate long before they were born.

I am enjoy swimming, I don't know how long Marco has been gone. I didn't realize that I had reached the bottom of the waterfall because of the hot weather and the feeling of the cold water on the body feels really good that I even thought if I sat at the bottom of the waterfall to let the water pour over my almost naked body. I've only been there for a minute when I felt my brassiere come off my chest! It's because there's no lace and the brassiere I am wearing is in tube style. I was shocked by what happened and confused what to do first, how to cover my naked breasts. Should I jump off the water again to get my brassiere before the water washes it away, or should I stay here in the falls to get help from the water to cover my naked body. I looked around first to find Marco for help but he wasn't there! He is nowhere to be found! Shit! I immediately went down to chase after my brassiere when it was being swept away by the water. Now I am not sure if Marco not being here is a good or a bad news, but as I think of it realized that I would really faint if he sees me naked right now! Good thing I know how to swim so I got my brassiere at the right time. I immediately breathed a sigh of relief. "Great! Just in time!" I said to myself while holding my brassiere. Of course, my breasts are exposed, well I'm the only person here so it's okay anyway. "Wow, nice breasts. Round and big!" It was as if my soul left my body when I heard an unfamiliar voice from somewhere.

Sara Jane wants nothing more than to get away from her ex husband —Jason, after his treacherous break up and betrayal. She takes her boss's offer on a vacation and spends the next few months buried in work. But things begins to change as her boss announces that a new client would be expecting Sara's marketing expertise for almost a million dollars. Sara is ecstatic of the good news and decides to accept her new reality away from Jason. Until... She bumps into the stranger at the pool. What happens when you bump into your next big client in the most weirdest way possible? He is mean. He is cold. He is ruthless. He is the cold elder brother of her ex husband. Sara Jane might have wished a world away from Jason, but fate had decided to plunge her right at the center of that world. An age long siblings rivalry, a cold boss, a selfish ex husband. Sara is forced into a family drama and the worse person she has on her side is her cold ruthless client , Alex Ford. He is dangerous. He is unforgiving. He is the mean ruthless heir that owns more than half of the family's empire. But when it comes to Sara, he takes actions that leaves everyone scratching their heads. Sara swore that she would never like him, she would never get close to him... But when push comes to shove. She sees herself doing questionable things. __________________________ Author's Warning The story is rated eighteen and features explicit scenes such as nudity, morally complex character, sex, curse words, vulgar words, violence, stalking, cyber bullying and obsession. Readers discretion is advised.

When the boss...gets unbuttoned! Deep in the Brazilian rainforest, innocent English rose Grace has come to reclusive billionaire Rafael's lair to save her business. With just minutes to persuade him to help – her only other option is to settle her debts in his bed! Alexandra is worlds away from Max Goodwin's glamorous staff, but this CEO needs a secretary – fast. So he hires Alex, with one condition: a makeover! Soon Max's thoughts turn from professional to very personal indeed... Brilliant surgeon Ben Blackwood grew up with nothing. So when the rich daughter of the man who jeopardised Ben's career appears as his new trainee surgeon, Ben isn't happy... But sparks are flying!