What do you think?
Rate this book
Last Mistake
Harley's my stepsister, and she hates my guts for a mistake I made a long time ago. I go undercover to protect her from the person who wants to retaliate against me, but I don't expect Harley to fall for Guy, the man I became when I put on my mask. For the first time in a long time, Harley lets me get to know her, and she gets to know the real me, even if it can't be me. I can be with her as long as I'm Guy. Will she be my last mistake?
Last Mistake is a dark, forbidden romance novella.
Last Mistake is a dark, forbidden romance novella.
109 pages, Kindle Edition
Published March 31, 2023
43 people are currently reading
1384 people want to read
About the author
Lauren Biel
39 books5,029 followersLauren’s stories are often emotionally raw, with lots of twists and turns. She describes her writing as “where light meets dark”, which represents how her witty humor compliments the darkness in every story. Instead of trying to mold her writing to fit in a box, she chooses to be unapologetically herself. While her focus is on Romance with dark elements, subgenre is no constraint for her. The common theme in every book is finding love when you least expect it. She enjoys putting her characters through tribulations, allowing their triumphs to be that much more poignant. Make sure you have your seatbelts secured. It’s always a bumpy ride.
When she’s not working, she’s writing. When she’s not writing, she’s spending time with her husband, her friends, or her pets. You might also find her on a horseback trail ride or sitting beside a waterfall in Upstate New York. She has a pretty normal life, yet her stories are anything but.
When she’s not working, she’s writing. When she’s not writing, she’s spending time with her husband, her friends, or her pets. You might also find her on a horseback trail ride or sitting beside a waterfall in Upstate New York. She has a pretty normal life, yet her stories are anything but.
Ratings & Reviews
Friends & Following
Create a free account to discover what your friends think of this book!
Community Reviews
Displaying 1 - 30 of 142 reviews
January 20, 2024
•| ⊱✿⊰ |• 4,5 Stars •| ⊱✿⊰ |
Let me start by saying, I love Lauren Biel books, so my rate may be a bit suspicious...
Although, it's banned (I don't know why it's taboo stepbrothers with both different parents, but... This is only my opinion), this is so soft...
I was hoping for a darker story, hoping... The warnings were there, this won't be the kind of usual book Lauren use to write.
Mason and Harley are amazing together, and I loved both Mason and Guy.
It's funny to see how they interact.
I can not say much about this book without spoiling.
September 16, 2025
This was an okay read. Would have been better if the FMC wasn't very much annoying.
October 25, 2023
Protective step-brother with pierced 🍆 I love it! Great storyline, dark forbidden and secret relationship.
January 30, 2026
UPDATED: I definitely did not do this book justice when I first reviewed it. It’s really freaking hot!! You’ll be super pissed at the FMC, but Mason makes everything worth it.
Mason (21, welder) found himself in trouble at 17, and even though he was innocent, his stepsister refused to believe him. When an enemy from the past threatens her, he makes it his mission to protect her, even if he has to hide his identity to do it.
Harley (19, virgin, twat) does not want her estranged stepbrother staying at her house. Not only does she hate him, but she’s just started hooking up with a masked man she met at a college party, and he’d only get in her way.
Several nights of masked snuggles turn into raging desires. Eventually the clothes come off, and they burn up the sheets!
The enemy makes a move, the truth comes out, and an HFN.
SEX: Very delicious!! The V is taken at 49%. No condoms are used, but he pulls out before the climax. Once she gets on BC, he stops using a condom. The sex to story ratio was really good.
MASON: I love him and his pierced dick.
HARLEY: On one hand, I freaking hate her for being so cruel to him. On the other hand, I understand how her age and immaturity led her to believe the things she did.
Hot, forbidden, and sooooooo yummy.
“You’re my forbidden fruit, sweet girl.... I’m trying so hard not to take another bite of you.”
Mason (21, welder) found himself in trouble at 17, and even though he was innocent, his stepsister refused to believe him. When an enemy from the past threatens her, he makes it his mission to protect her, even if he has to hide his identity to do it.
She was mine whether I was Guy or Mason. Whether she was my stepsister or not. Mine.
Harley (19, virgin, twat) does not want her estranged stepbrother staying at her house. Not only does she hate him, but she’s just started hooking up with a masked man she met at a college party, and he’d only get in her way.
Before the incident, she disliked me. After the incident, she hated me. By then, there was no breaking through the walls she’d built around herself with the bricks I’d handed her.
Several nights of masked snuggles turn into raging desires. Eventually the clothes come off, and they burn up the sheets!
I had made a lot of mistakes in my life, but I wanted her to be the last. My last mistake.
The enemy makes a move, the truth comes out, and an HFN.
“I love you, sweet girl. I shouldn’t, but I do. I never thought I was capable of loving another person, but you live in my mind all the time, Hal. All the time…. and if that isn’t love, I don’t know what is.”
SEX: Very delicious!! The V is taken at 49%. No condoms are used, but he pulls out before the climax. Once she gets on BC, he stops using a condom. The sex to story ratio was really good.
MASON: I love him and his pierced dick.
HARLEY: On one hand, I freaking hate her for being so cruel to him. On the other hand, I understand how her age and immaturity led her to believe the things she did.
Hot, forbidden, and sooooooo yummy.
October 22, 2023
As always, this book was a fucking masterpiece and Lauren can do no wrong 🙄 It’s sickening how ridiculously obsessed I am with her writing 🫠🙈😂😂
I literally have no words!!! 🤌🏻👏🏻👏🏻
I literally have no words!!! 🤌🏻👏🏻👏🏻
October 29, 2023
I Squealed
🌟: 4.5/5
🌶️: 4/5
This was a refreshingly sexy read! Don’t get me wrong, I do loooove Lauren’s traumances, but this was a wonderful pick me up! The forbidden trysts, the “touch her and d*e” trope—it’s all too good to pass up. Loved this little novella!
🌟: 4.5/5
🌶️: 4/5
This was a refreshingly sexy read! Don’t get me wrong, I do loooove Lauren’s traumances, but this was a wonderful pick me up! The forbidden trysts, the “touch her and d*e” trope—it’s all too good to pass up. Loved this little novella!
February 21, 2024
Short, spicy, and a little sweet. The mask idea is enticing. Enjoyed. 4 stars ⭐️⭐️⭐️⭐️
March 25, 2024
Quick hot novella featuring step-siblings and a masked man … and he calls her “sweet girl” 🫠
October 23, 2023
Devoured this in a few hours 😍
Lauren is right, this is waaay tamer than her usual stories, but it was still HOT 🔥🔥🔥🔥
Quick read, tons of spice, and such a very naughty fling turns into what should be forbidden 😈. As always fellow readers, make sure to read any and all trigger warnings!
I'd love another story with these 2. For being step-siblings, Lauren still made their chemistry fly off the page as the story went on.
Thank you for the chance to read this 💜
Lauren is right, this is waaay tamer than her usual stories, but it was still HOT 🔥🔥🔥🔥
Quick read, tons of spice, and such a very naughty fling turns into what should be forbidden 😈. As always fellow readers, make sure to read any and all trigger warnings!
I'd love another story with these 2. For being step-siblings, Lauren still made their chemistry fly off the page as the story went on.
Thank you for the chance to read this 💜
October 23, 2023
1st person/dual pov
Spice: 4/5
Such a cute and spicy novella to read during spooky season! Not as dark as some of Lauren’s other books but the dirty talk and the steam are still on point. The story itself was really entertaining and I was a big fan of the way we get to see both sides of Mason’s character due to the circumstances. Spoiler Alert - I friggin loved both of his sides because let’s face it he was written by Lauren! 🤣🤷🏻♀️
As always check the TW before reading just to be safe! 🖤
Spice: 4/5
Such a cute and spicy novella to read during spooky season! Not as dark as some of Lauren’s other books but the dirty talk and the steam are still on point. The story itself was really entertaining and I was a big fan of the way we get to see both sides of Mason’s character due to the circumstances. Spoiler Alert - I friggin loved both of his sides because let’s face it he was written by Lauren! 🤣🤷🏻♀️
As always check the TW before reading just to be safe! 🖤
October 24, 2023
I'm a sucker for a good taboo book, and then the fact it's a lauren biel book!? Say less. Immediate five stars.
March 10, 2025
Another quick read from Lauren. A forbidden romance or is it? I suppose it depends upon your point of view, it could be classed as taboo, they are step-siblings but they’re not blood relations 🤷🏻♀️
Masons’ past catches up with him but fortunately he’s there to protect Harley before the worst can happen or did it already?
I was excited to have won this ebook from Lauren as it was in my TBR anyway, so this prompted me to read it. Totally enjoyed the story, who doesn’t enjoy a masked man? Plus the story giving us Mason’s real past history 🖤
Masons’ past catches up with him but fortunately he’s there to protect Harley before the worst can happen or did it already?
I was excited to have won this ebook from Lauren as it was in my TBR anyway, so this prompted me to read it. Totally enjoyed the story, who doesn’t enjoy a masked man? Plus the story giving us Mason’s real past history 🖤
October 27, 2023
Loved this step-sibling novella! This wasn't as dark as Lauren's other books so if you want to start with any of her stories, try this one.
The story sucked me in from the first page. The MC did minor time in juvie and Harley never wanted to hear his side of the story and just assumed the worst. But regardless of her constantly pushing him away he is still protecting her without her knowing it. Harley at times was annoying but that was because she was naive and stubborn for no reason.
Loved the tension build up in this story and I would recommend this if you love spicy taboo romances❤️🌶️
⚠️Check the TW before reading just to be safe⚠️
The story sucked me in from the first page. The MC did minor time in juvie and Harley never wanted to hear his side of the story and just assumed the worst. But regardless of her constantly pushing him away he is still protecting her without her knowing it. Harley at times was annoying but that was because she was naive and stubborn for no reason.
Loved the tension build up in this story and I would recommend this if you love spicy taboo romances❤️🌶️
⚠️Check the TW before reading just to be safe⚠️
November 19, 2023
A spicy step sibling taboo romance. On top of that, a stalky masked man. Yes, please! Now, this novella isn’t anywhere near as trauma inducing as Biel’s usual work but you won’t find me complaining. I actually rather enjoyed the rate of the plot progression. Sometimes I feel like I miss character development with novellas but that wasn’t the case with Last Mistake. I would definitely recommend this as an entry level read if you are wanting to start checking out what Lauren Biel has to offer.
October 21, 2023
This book was just what I needed! Dark, delicious and forbidden! No one ever grips me like Lauren does! You’ll find her usual triggers in this book, I absolutely love Mason and felt so bad for him throughout the book. The perfect ending but I definitely need more of this couple.
October 23, 2023
Taboo and Steamy
Mason and Harley are step siblings who hate each other, right up until they realize that they’re each not who they thought they were.
Such a good book, great character, the tension between them makes for some spicy scenes. You’re going to love it!
Mason and Harley are step siblings who hate each other, right up until they realize that they’re each not who they thought they were.
Such a good book, great character, the tension between them makes for some spicy scenes. You’re going to love it!
July 17, 2024
•Step-Siblings
•Pierced Peen
•Secret Relationship
•Hidden Identity
•Masked Man
•Virgin FMC
•Forbidden Romance
•Taboo
•Stalking
This was everything I hoped it would be and more. Omg so deliciously spicy ugh. My only complaint is I wished it were longer 😂 I could’ve easily read a 300 page book about Mason and Harley.
Mason is trying to protect his step-sister from a bad guy from Masons past. In the process she becomes attracted to the masked stranger who keeps finding her at parties. They exchange phone numbers (his is one from a texting app) and grow closer the longer they text.
The way Harley finds out the masked man is actually her step-brother Mason sent me into orbit 😂 I had to put my kindle down because omg of course that’s how she found out. Shew the spicy scene they have in his childhood bedroom after having dinner with their parents was *chefs kiss*. I can’t believe this book isn’t talked about more.
If you’re looking for a step-bro masked stalker who hides his identity from his step-sister while doing spicy things to her, definitely read this! This book is banned so go to LB’s Etsy to get it💕
•Pierced Peen
•Secret Relationship
•Hidden Identity
•Masked Man
•Virgin FMC
•Forbidden Romance
•Taboo
•Stalking
This was everything I hoped it would be and more. Omg so deliciously spicy ugh. My only complaint is I wished it were longer 😂 I could’ve easily read a 300 page book about Mason and Harley.
Mason is trying to protect his step-sister from a bad guy from Masons past. In the process she becomes attracted to the masked stranger who keeps finding her at parties. They exchange phone numbers (his is one from a texting app) and grow closer the longer they text.
The way Harley finds out the masked man is actually her step-brother Mason sent me into orbit 😂 I had to put my kindle down because omg of course that’s how she found out. Shew the spicy scene they have in his childhood bedroom after having dinner with their parents was *chefs kiss*. I can’t believe this book isn’t talked about more.
If you’re looking for a step-bro masked stalker who hides his identity from his step-sister while doing spicy things to her, definitely read this! This book is banned so go to LB’s Etsy to get it💕
December 29, 2025
Last Mistake by Lauren Biel was a one sitting read for me. I devoured it in an hour.
Harley hates her stepbrother. Like, truly despises him. She sees Mason as one of the most vile, disgusting humans on the planet and wants absolutely nothing to do with him. Mason, on the other hand, is the painfully overprotected stepbrother who’s always watching from the sidelines, especially when it comes to keeping Harley safe. And then there’s the mask…and once those lines are crossed, everything changes.
The tension in this book is intense. The push and pull, the hatred mixed with something much darker, and the way everything slowly unravels kept me glued to the pages. Lauren Biel does what she always does best—dives headfirst into morally gray territory and makes it impossible to look away.
This story is a little dark (more so grey), twisted, and absolutely not for everyone, but if you know Lauren Biel’s work, you already know what you’re signing up for. She never disappoints, and Last Mistake was no exception.
Harley hates her stepbrother. Like, truly despises him. She sees Mason as one of the most vile, disgusting humans on the planet and wants absolutely nothing to do with him. Mason, on the other hand, is the painfully overprotected stepbrother who’s always watching from the sidelines, especially when it comes to keeping Harley safe. And then there’s the mask…and once those lines are crossed, everything changes.
The tension in this book is intense. The push and pull, the hatred mixed with something much darker, and the way everything slowly unravels kept me glued to the pages. Lauren Biel does what she always does best—dives headfirst into morally gray territory and makes it impossible to look away.
This story is a little dark (more so grey), twisted, and absolutely not for everyone, but if you know Lauren Biel’s work, you already know what you’re signing up for. She never disappoints, and Last Mistake was no exception.
October 31, 2024
Our goddes Lauren is simply a guarantee of perfect reading experience.🙇♀️ She managed to fit a crime, coping with trauma, truly disgusting revenge, mysterious masked protector, forbidden love, exquisite spicy scenes and even piercing in 🍆💦, in one hundred and twenty pages!
WHAT A RIDE!! 10/10.
WHAT A RIDE!! 10/10.
April 26, 2025
Good “your mine” and protective smutty book.
June 17, 2025
I ended up rushing through the end of the book. I might be in a reading slump and this just didn’t do it for me.
December 25, 2023
Wrong, but good!
Mmmm yes!! Taboo, dirty, but oh so hot.
Protective Step Brother. Innocent Step Sister. Masked man fantasy.
Quick read but very good.
Mmmm yes!! Taboo, dirty, but oh so hot.
Protective Step Brother. Innocent Step Sister. Masked man fantasy.
Quick read but very good.
March 20, 2024
Lauren always write stellar novellas, and this is just another one.
🌶🌶🌶🌶/5 spice
🔥🔥🔥.5/5 angst
🥵🥵🥵🥵🥵🥵 MC
⭐️⭐️⭐️⭐️/5 plot
Love love love!
🌶🌶🌶🌶/5 spice
🔥🔥🔥.5/5 angst
🥵🥵🥵🥵🥵🥵 MC
⭐️⭐️⭐️⭐️/5 plot
Love love love!
April 2, 2024
Cute forbidden step-siblings romance. Masked man. The Guy is pierced. Emphasis on Light Grey, indeed!
January 21, 2025
Amazing Novella
⭐️⭐️⭐️⭐️.5
🌶🌶🌶
🖤🖤🖤love me a great novella! Short, sweet, and hit all the right spots. With this being a novella and fast-paced, I do not want to give any spoilers other than it is a forbidden love between stepsiblings. Give this amazing novella a try, you won't regret it!
TROUPES
Masked man
Stepsiblings
Fast-paced
⭐️⭐️⭐️⭐️.5
🌶🌶🌶
🖤🖤🖤love me a great novella! Short, sweet, and hit all the right spots. With this being a novella and fast-paced, I do not want to give any spoilers other than it is a forbidden love between stepsiblings. Give this amazing novella a try, you won't regret it!
TROUPES
Masked man
Stepsiblings
Fast-paced
December 23, 2025
Another quick read from Lauren. A forbidden romance or is it? I suppose it depends upon your point of view, it could be classed as taboo, they are step-siblings but they’re not blood relations 🤷🏻♀️
Masons’ past catches up with him but fortunately he’s there to protect Harley before the worst can happen or did it already?
I was excited to have won this ebook from Lauren as it was in my TBR anyway, so this prompted me to read it. Totally enjoyed the story, who doesn’t enjoy a masked man? Plus the story giving us Mason’s real past history 🖤
Edit: 23rd December 25 - Audiobook
The narrators have done a brilliant job with this, the tones they use for the characters are 🤌, it just works so well. NGL I did titter a few times too, and maybe had a few hot flushes 🥵
Masons’ past catches up with him but fortunately he’s there to protect Harley before the worst can happen or did it already?
I was excited to have won this ebook from Lauren as it was in my TBR anyway, so this prompted me to read it. Totally enjoyed the story, who doesn’t enjoy a masked man? Plus the story giving us Mason’s real past history 🖤
Edit: 23rd December 25 - Audiobook
The narrators have done a brilliant job with this, the tones they use for the characters are 🤌, it just works so well. NGL I did titter a few times too, and maybe had a few hot flushes 🥵
October 14, 2024
✨ Book Review ✨
📖 Last Mistake by Lauren Biel
⭐️⭐️⭐️/5
🌶️🌶️🌶️/5
I finished this in one sitting! Now I went in blind, but the step sibling trope is definitely not my cup of tea! I did power through though and just pretended they didn’t know each other😂 This was like Credence for me all over again! I love Lauren as an author so I’ll continue to read her work, I’ll just quit going in blind 😂
📖 Last Mistake by Lauren Biel
⭐️⭐️⭐️/5
🌶️🌶️🌶️/5
I finished this in one sitting! Now I went in blind, but the step sibling trope is definitely not my cup of tea! I did power through though and just pretended they didn’t know each other😂 This was like Credence for me all over again! I love Lauren as an author so I’ll continue to read her work, I’ll just quit going in blind 😂
March 22, 2025
2/5⭐️
This one just wasn’t it for me. I usually love taking a chance on online recommendations as they’ve led me to some amazing books and authors I’d never have found otherwise. But, yeah… not this time.
This one just wasn’t it for me. I usually love taking a chance on online recommendations as they’ve led me to some amazing books and authors I’d never have found otherwise. But, yeah… not this time.
January 3, 2025
I have never read a Lauren Biel novella before and I am sitting here wondering why I left it so long because diving into this world head first, considering this read was only 110 pages I ATE IT UP and I never wanted this ride to end. I loved the tension between Mason and Harley it really added another layer to every single scene and interaction between Guy and Harley especially since I knew that it was actually Mason under that mask! The love I had for this read was truly something else; I giggled, I screamed (very loudly multiple times), I gasped and I didn’t want to put it down even when I had too - Mason you are A MAN, I have read about many protective men during my reading journey but if the next guy that I allow into my life doesn’t protect me the way that Mason protected Harley I don’t want him and he doesn’t deserve my time because that man went to the end of the earth to keep his girl safe and it made him even more attractive than he was which I truly did not think was possible.
Not only did this novella include the step sibling trope which has recently become one of my new found favourites but it also included a masked mmc and whenever Mason took on his masked man persona I MELTED 🫠 He has officially taken his place in my masked men hall of fame, I will be putting his photo front and centre in the prettiest frame I can find with beautiful purple lights to match that sexy mask of his. Lauren, I owe you an apology because I do not have an excuse as to why it’s taken me so long to read your books but it will now be my personal mission every single book, novella and short story you have ever published because your writing is a work of art and I cannot wait to read more of your work! 📚
Not only did this novella include the step sibling trope which has recently become one of my new found favourites but it also included a masked mmc and whenever Mason took on his masked man persona I MELTED 🫠 He has officially taken his place in my masked men hall of fame, I will be putting his photo front and centre in the prettiest frame I can find with beautiful purple lights to match that sexy mask of his. Lauren, I owe you an apology because I do not have an excuse as to why it’s taken me so long to read your books but it will now be my personal mission every single book, novella and short story you have ever published because your writing is a work of art and I cannot wait to read more of your work! 📚
Displaying 1 - 30 of 142 reviews