Mommy Darkest

by Sadie Minx

I’m not a good person. But I don’t deserve this.

It was just a bit of fun. Catfishing men on the internet, tricking them into sending me money, gifts.

Then I messed up. I pretended I was her.

Catharina Montgomery. Third richest woman in the world, heir to a fortune with more zeroes than my brain can even comprehend.

That’s how the world knows her. But I just know her as… Mommy.

She tricked me. Made me believe I’d hit the jackpot. An all expenses paid vacation to a tropical island where I’d be pampered and waited on hand and foot by hot cabana boys every minute of every day.

But the island is a lie. Instead of spending my days in the lap of luxury, I spend them in a nursery, subjected to the twisted, depraved desires of a woman I never should have crossed.

Because on an island full of dark and depraved men, my Mommy is the darkest of them all.

Genres: Dark Romance, Romance, Lesbian, Dark, BDSM

283 pages, Kindle Edition

Published November 7, 2025

Reviews

[Joy Westerfield · Rating 5 out of 5]

I’ve loved this series from the very beginning and enjoyed as each Daddy finds their Little. Yes, it is a bit dark, dirty and a little depraved, but that is what makes it so enjoyable to read! I always hoped that Auntie Cat would find her own Little girl to love. Of course, just like the others, she goes about it in an unconventional way. Alexis is a young woman, never feeling love and feels like she shouldn’t be loved because of her size, and my heart hurt for her. So when Catharina sets her sights on Alexis, I just knew I was in for a fun ride! The warmth and love that Catharina shows Alexis just made my heart melt, but it wasn’t always perfect. Little girls can sometimes keep their Mommy’s on their toes! And Mommy Cat never puts up with shenanigans (hairbrush anyone?). What I really found inspirational about this story is that Catharina continually shows Alexis, not just with words, but with actions, that she is perfect just the way she is and that it’s okay to be different and that she is very much loved. And how Alexis learns to love herself, which made me so happy. Plus with the other characters being a part of this end of the series was heartwarming and the ending was utter perfection. I loved this story and series so much that I am sad to see it go, but look forward to the next new series!

[Jan · Rating 5 out of 5]

Catharina Montgomery has been waiting for her little one for a long time. She watched each of her “brothers” find their little one. Now she has found hers and plans to never let her go. Alexis was doing a con but got trapped. She played the role of Catharina but when a fake trip brings her face to face with the woman, she is in for punishment. But she sure didn’t expect to be calling her mommy and being her little girl.

I was thrilled that Cat found her little. I could understand where Alexis was coming from. She didn’t see herself as perfect or little. She was a woman with a bit more to love and Cat loved that. There were insecurities that Cat had to break through with Lexie. Cat would do anything for her little girl. These two both feel jealously for one reason or another. I have to say this story was really sensual. Got me hot and bothered at times. The “brothers” were supportive of Cat and Lexie and understand changes. Cat defiantly shows Lexie how she feels. Lexie is her little girl and WOW we learn something more about Cat. And we have a new bunch of Daddies and Mommy. Looking forward to reading about the Thorne siblings starting with Axel.

I received a free copy of this book and am voluntarily leaving a review.

[Bethann · Rating 5 out of 5]

Sadie minx has done it again. I think this was my favorite book in this series I had been waiting for Mommy Cat to come along. If you thought these daddies were “Devious “ you haven’t really met “Mommy Cat”!! Catharina Montgomery has always been wanting what her “brothers “ on the island had. She wanted her own little girl!! So when she finds out the Alexis was using her name to get over in Rich men she takes action!! She tell Alexis that she going to an island where she will be spoiled just like she’s wanted. But Alexis soon finds out that this island is not what she’s been expecting at all and she learns this very quickly while she’s on the plane getting her ass spanked by Catarina “hairbrush ”! Once on the island though she becomes to learn that she’s now Cat’s little girl.. Alexis has a lot of insecurities that her Mommy has to help her work through esp with her body image for she believes she’s to heavy and curvey to be a “little anything “ this def can resonate with me for I too have many insecurities.. this book was filled with much love and of course a good old fashioned spanking with her mommies infamous hairbrush!! I recd this as an ARC but loved and purchased and will def be getting in paperback too

[Stacee Miller · Rating 4 out of 5]

I love Mommy Catharina! Aunty Cat was always a great character in all the other books so I was excited to see her get her own little girl!! She deserves to be happy like all the brothers! Alexis is great but she broke my heart many times with her insecurities!! I love how Cat helped her by listening to her concerns, changed anything that bothered her and continued to let her know how beautiful and special she was throughout the entire book! Alexis will eventually start to believe in herself but it will take time and she found the best Mommy for the job!!
I took off a star because the book adds to the stereotype that people can change their sexuality at a drop of a hat! It’s only talked about once and Alexis said she’s never been with a woman. Why would we have Cat think Alexis would want to be in a committed lesbian relationship if she’s not a lesbian or bisexual! I love the lgbtq+ community and I’m not sure if this is the best representation of a ff relationship. This is what scares those crazy white people into “thinking that gay people can change them!”
I’m truly going to miss this amazing found family!! I also love that we got to meet Aunty Gray and Uncle Axel because they are some of the characters of the new series! I can’t wait!!

[Arin Baur · Rating 5 out of 5]

I was really nervous about reading Cat story cause it was FF story but considering I’m already attached to all the amazing characters in this story I was determined to read her too! And boy am I did the author did awesome job giving me just enough steamy along with lots of surprises I couldn’t have imagined without it being too much to making me uncomfortable. I thought this book was beautifully unique I couldn’t put it down let alone how much I really enjoyed it from start to from beginning to end! These two women are strong and I believe they have lots in common when lonely and insecurities I didn’t realize Cat hides a lot about herself. I felt like I learned lots about her like I believed she is even ground to dr D. I was intrigued by her personality outside of her aunt cat Persona. I love the connection between her and Alexis has I felt like throughout the whole book she’s building Alexis self-esteem up among other things. This is a great example what happens when you have a wonderful caring patient people surrounding you! I’m so excited about the news the author announced to us at the end of this book I’m so excited!!

[Rara Loves to Read · Rating 5 out of 5]

Amazing heartfelt conclusion to a fantastic series

Mommy Darkest by Sadie Minx might be my favorite book in the Forbidden Pleasures Island series. It hit me in a very personal way because of how deeply it showed the damage words can do. Alexis worried that she didn't look like a “Little” or fit the mold and that self-doubt created problems in her relationship with Cat. That felt so real and so relatable because many of us have carried insecurities from what others have said about us. My heart hurt for Alexis who just wanted to be loved and seen fully for who she was.

Yes, Cat brought her to the Island under false pretenses like the other couples in this series, but their dynamic felt more raw and more human to me. Watching Alexis slowly trust, soften, and accept her place as Cat’s little girl was emotional and satisfying. Sadie Minx did an incredible job capturing how insecurity and jealousy show up in Littles and how those emotions can impact connection.

I am sad to see this series end because I genuinely loved being on this journey, but it looks like there is another series coming next and I am already excited for what’s next from Ms. Minx.

[Sue · Rating 5 out of 5]

Wonderful end to this simply amazing series, a great collection of Littles and their Daddies and Mommy
I have to say that this book had been much awaited as I had read all of the previous books in the series and was interested in discovering when Cat would find her own little. I have to say that she certainly had her hands filled with Lexis, they may have gotten off to a rocky beginning but it is soon apparent she is more than a match for this naughty little girl.
When she reaches the island and realises that she is going to be staying with Mommy Cat and that she will be punished severely by hairbrush for any bad behaviour and she starts off full of it, her bottom pays the price and she learns that her Mommy wants to keep her safe and loved
I hope that there will be more books about the island and also more mommies and daddies and their littles that will find happy and safe homes.
I thoroughly enjoyed the book and look forward to reading any future publications; keep up all the wonderful writing.

[Marybeth · Rating 5 out of 5]

This is the final book in the Forbidden Pleasures Island series, and I think it is my favorite. I would warn you to take the trigger warnings seriously, but this whole series has been full of trigger warnings, and you're still here. LOL

Auntie Cat is ready to become Mommy and has found her Little in Alexis. Alexis is basically kidnapped, but she comes to enjoy her mommy's attentions. Alexis has been pretending to be Cat to fleece rich men, and Cat finds her to be the perfect candidate to be her Little. Alexis finds herself giving in, not realizing she really wants to. I really felt for Alexis during the waterpark episode. Cat needed to do a lot more investigation before giving in to her anger, and she should have at least wondered if jealousy was part of the problem. I personally think Cat deserved the fear she felt over misplacing Alexis, and that Alexis is definitely the smartest of all the Littles.

I'm looking forward to the next series with the Thorne siblings.

[Terrin Thomas · Rating 4 out of 5]

The final book in my favorite dark romance/DDlg series did not disappoint. It took me a little longer to get through—not because it lacked intrigue or strong writing, but simply because the Mommy dynamic is a little outside my usual realm of interest. Even so, it was an intense, captivating read and a fantastic conclusion to a phenomenal series.

One of my absolute favorite things about this book was how beautifully it highlighted the struggles and insecurities of a plus-size little. It was done with so much care, realism, and heart that it made the story feel even more meaningful and relatable.

Sadie truly outdid herself with this world. The ending not only wrapped things up perfectly, but also opened the door for an exciting new series on the horizon. If you love all things DDlg/MDlg, smutty, dark, and deliciously unhinged, this series is absolutely for you.

A perfect finish to a wild ride.

[Michelle Lane · Rating 5 out of 5]

This is the book that I have been waiting for and it did not disappoint! Be prepared to go on an emotional rollercoaster with this one.
Catharina (Cat) Montgomery seemingly has everything except the one thing she really wants - someone to love. Having watched her ‘brothers’ find their baby girls, she is resigned to never finding the one meant for her. Enter Alexis.
Having believed herself not enough, too big, and just too much, Alexis thinks she is not worthy of anything. After using Cat’s name and picture to scam people, Alexis finds herself whisked off to a mysterious island where she finds everything she never had but always wanted. A found family, friends and an intense love.

A beautiful end? to a wonderful series.

[Samantha Morgan · Rating 5 out of 5]

Woah. Kay. Let me just say I agree with Gavin, Mommy Cat is scary! But in a hot and mommy dommy kinda way. The author did an amazing job with this story, not just the steam but the absolutely beautiful emotional parts that had me crying. Can a plus size, big girl really be a little girl? Yes they can and they are worthy of love and every opportunity as other and this book dives into that so perfectly…

now that the pretty stuff is over with I have to say…. Every one of these books just get better and better. That dinner scene y’all! Ho le sheet! And the barn! I don’t know which one was hotter! Yowza!

Also; I’m team Lexie for the water park debacle. Poor baby girl. Just wanna give her a hug.

Overall this is my favorite one, a fantastic story that I’d love in paperback!

[Milliesbookcorner · Rating 5 out of 5]

Absolutely fenomenal! Our favorite hairbrush-wielder mommy gets her shot at love and it’s absolutely amazing, a little bit bittersweet because I don’t want to be done with the family but it was an amazing final book in the series. Mommy Cat gives even daddy dreadful a run for his money with the definition of a strict dom. Even though the strictness, Lexis loves it and they are both so well written that the book brought me to tears with her issues surrounding her weights and self esteem are so relatable and sad. Truly so well written! I loved it so much and I am so looking forward to reading about Alex and anything else related to the island!

[Hannah Bobb · Rating 5 out of 5]

I have devoured each one of these books in this series but none of them have made me so freaking anxious and excited to have Cat’s very own story. I’ve loved every single one of her appearances in the other stories and just knew she would be the best Mommy to her Little girl. Cat got everything she wanted in her feisty redheaded Little - Alexis aka Lexie.

Alexis goes through many of the transitional hurdles that her other Little friends have but her views on her own body need worked on with the help of her Mommy. There have been people who tell Alexis that’s she’s too fat or not pretty enough or small enough and it weighs heavily on her mind. Cat helps her to see that she is the only one for her - even if she has to take her hairbrush to her and remind her every day.

This was definitely the best one in the series and I hope we see more Mdlg stories from Sadie!

[Karon Price · Rating 5 out of 5]

I was so happy that Auntie Cat got to find her own little girl. Alexis is a con artist abusing Catharina's name and therefore falling easily into her trap. She's confused about her feelings for Car and has such a low body image, Cat really has to work at showing her she's perfect just as she is. On the other side, Cat's feelings of always being on the outside, the girl who is too rich, too lesbian, too different and always worrying she would never find her own little girl was just heartbreaking and oh so real. I loved that Alexis was jealous, again REAL. The fire between these two was explosive and I loved it. These two got the best HEA.

[Foodiegirl · Rating 5 out of 5]

This is the final book in Sadie Minx's "Forbidden Pleasures Island" series. I have been looking forward to Cat finding her little.
Alexis has been using Catharina's identity online to swindle rich men. When Cat finds out she decides Alexis is to be her Little girl. When Alexis finds out Catharina knows and offers her an all expenses paid trip to an exotic island she can't turn it down. Not realizing she is actually being kidnapped. I really felt for Alexis after realizing what she has gotten herself into. Alexis has deep self-esteem problems and jealousy is definitely an issue with both of them and working around the problem takes a lot of work and tears.
A good ending to this series.

[Pat · Rating 5 out of 5]

The last member of the family to find her Little Girl is Catharina, who rivals the others as the darkest. Once again, her Little Girl does not go the island voluntarily but finds her home there.

This is the last in the series (and provides a brief intro to the next series). While it IS a standalone, it is far better to have read the previous books as many of the characters are from the earlier books. There is really no continuing story arc between the books, other than the residents of the island.

[ZJT · Rating 4 out of 5]

This was such a fun, diabolical end to the series.

You reap what you sow. Wow, Alexis really hauled in the big one! While she was enjoying the windfalls of her scheming, she had no idea there was a master schemer who knows what she wants.....

I had a few good laughs with this incredibly entertaining and yet very touching depraved romance. There were a couple of interesting twists to liven the eventual capitulation to island life.

Alexis completes the family, Catharina is a superior Mommy. I like the way she boosts Alexis's confidence and encourages her self-esteem.

[Amanda Graham · Rating 5 out of 5]

Catharina and Alexis

This is the sixth book in the series and while it would be okay as a standalone I think it is way better read in order. I really identified with Alexis and all her internalized fat shame. The way Cat just kept showing her how loved she was got me all up in my feelings. Don’t get me wrong this is just as dark as the rest of the series but the backstories were just a bit more emotionally charged. I cannot wait to get more from this universe and the epilogue reveals where it is going next.

[Elizabeth · Rating 4 out of 5]

I have enjoyed all the stories in this series and was a little hesitant to read a Ff story, but I put that aside and focussed on the story itself. Alexis has such a negative body image and low self esteem that it breaks your heart. The best thing that Cat did is restore her self confidence and self value. The way she got Alexis to the Island is hardly acceptable but the results outweigh the action and the benefit to Alexis is powerful and so, so valuable.

[Caroline Ulrich · Rating 5 out of 5]

Kleenex needed

This is one of the best stories I have read by Sadie Minx. It truly hits on all the emotions, especially for those who don’t fit the stereotype typical body type. It was nice to see Cat trying to figure out and support Alexis through her body issues and finding herself in the family. I appreciate the fact she didn’t shy away from hitting at the insecurities people have and finding a way to recognize them.

[Tanya Rae ~ TaSTy WordGasms · Rating 5 out of 5]

Mommy Darkest is the sixth book and final book in the Forbidden Pleasures Island and a book that I have been looking forward to! This is Catharina Montgomery and Alexis’ story.

I have to say that I am sad that this is the last book in the Forbidden Pleasures Island series. While I could never live like this, especially 24/7 it was great to read.

I am really looking forward to what’s next with this author whatever that will be.

I read this book from Kindle Unlimited.

[Margaret Corcoran · Rating 5 out of 5]

Sweet, sexy and hot read. Catharina does spank very hard with her hair brush but she loves very hard. Alexis comes to the island unwillingly but finds her home with her Mommy. I really enjoyed all their interactions. I love all the real and well rounded characters. I received an advanced reader copy of this book and am leaving an honest review. This is a very well written and interesting erotic that draws the reader onto the island, and they will not want to leave.

[Lindarhc · Rating 5 out of 5]

Catharina finally finds her little girl. This was a great ending to these books. I’m sorry they are finished and can’t wait for the wood choppers story. Cat catches Alexis impersonating her and offers her a holiday on a tropical island to get pampered. This had me in tears and also smiling at the same time. I was sorry to read the last story and can’t wait for the next one to come out. These books have drawn you in to the stories and you feel as if you are there.

[Kelly · Rating 5 out of 5]

A Hairbrush, Cookies And Milk!

Mommy Darkest is book 6 in the Forbidden Pleasures Island series and what an exciting series ending it is! I recommend starting the series from the beginning and enjoying a Little binge read. Yes, this could be read as a standalone but past characters and events make an appearance here and the stories are too good to miss!

I loved the insecurities of these characters and all the family drama, trauma and healing that goes with it. There was plenty of tension, humor and spice that brought the story to life and quirky characters, intriguing locations and a strong storyline that I thoroughly enjoyed.

There is also the perfect tease for a new spin-off series that I cannot wait to dive into… hurry up and write faster Sadie Minx! I am very greedy to find out more about these mysterious lumberjack Daddies and Mommies so yes, I am whining like a petulant Little girl!

[Deeder · Rating 5 out of 5]

Catarina (Cat) Montgomery gets her little one. Last of the Forbidden Pleasures Island series, is Sadie Minx at her best. A rough start as with all the stories in the series, but both dark and hot. Alexis finds her way to the island not really knowing what she's gotten herself into. A story of growth, learning new things, and finding she liked it. HEA

[Neecee · Rating 5 out of 5]

Wow.

Wasn’t what I expected, but it was way better! Being a bit thicc myself, I could identify with Alexis and her not liking her body type. She sure put up a fight with her Mommy, learning the ropes. It was fun, heartbreaking and rewarding watching this relationship develop and grow. Looking forward to Axel’s book.

[Tanaka · Rating 4 out of 5]

I enjoyed seeing Cat be dominant but it felt inauthentic like swapping out the a man’s name for her character. She didn’t read like a woman or maybe it’s just me it didn’t feel like wlw but other than that not bad I guess

[Heather · Rating 5 out of 5]

I love this series, Each book has me engaged. This is Alexis and Cat. Her mommy Cat helps her work on her self esteem. She is worried the Cat will find someone else, I loved the bond between mommy and little, A good story to end the series, Loved it

[Mystisith · Rating 3 out of 5]

I read this for the dynamic only so the girl on girl spice did nothing for me. A lot of suspension of disbelief had to happen re lactation kink (& for the hucows): Babies of the vanilla kind were nowhere to be seen...😏

[Tricia Grogan · Rating 5 out of 5]

could not put it down

This book I think was my favourite of the series. The sweet relationship between the two just made me smile. I have loved the other books but this one was one I could not put down.
I highly recommend this book.