One Hundred Percent Mine

by Emma Aiseman

Claire Bellingham is not having the best time of her life, to say the least. After her boyfriend of two years ends their lukewarm relationship, she finds out she’s pregnant with his child. Her archenemy at work becomes her new boss. Her long put-to-rest anxiety decides to float back up. And the hot stranger who kissed her senseless at the mall can’t seem to remember who she is, or maybe just doesn’t care. She was hoping to run into him again, but at her office was not really what she had in mind. And now they’re supposed to work together.

On the one day Christian Copeland isn’t wearing his glasses, he bumps into the most beautiful woman he’s ever seen. But he doesn’t need glasses to know that she’s stunning, the kind of woman who takes your breath away. Which is exactly what she does when she, without much warning, asks him to kiss her to make her ex jealous. So he does. Then walks away. Now he can’t get her out of his head. And he has no idea who she is, or if he’ll ever come face-to-face with her again. But of all places, he finds her at work. And his face, it seems, is the last thing she wants to see.

This is the second book in the GERI Labs STEM/academic romance series, but can be read as a standalone.

A dual-POV, STEM (biotech) workplace romance with sizzling chemistry, a surprise pregnancy (not his), found family, and a whole lot of heart.

Genres: Stem

352 pages, Kindle Edition

Published November 20, 2025

About the author

Emma Aiseman is the not-so-secret pen name of a biochemist who loves to write happily-ever-afters.

She lives in New Jersey with the loves of her life: her husband and three children (and tiny yet mighty puppy who firmly believes he's human).

A scientist by day—she spends her time in the biotech world, questioning dogmas and working to develop medicines for incurable diseases.

A writer by night—(well, actually early mornings), she dives into the fictional romance world, swapping pipettes and scientific manuscripts for plotting swoony characters, sizzling chemistry, positive twists and happy endings.

When not managing teams of scientists or writing fiction, you can find her reading (romance, of course), cooking, or playing pickleball with her kids.

Reviews

[Lillian Christenson · Rating 4 out of 5]

I enjoyed the slow burn of this story, as well as the science background. The one thing I didn’t enjoy as much was the third-act break up. Claire and Christian’s story was sweet and I appreciated their friendship as part of their love story. The one thing I could have done without was Ryan, the ex. I understood his purpose, but he turned me off completely with his “all or nothing” stance. Overall, 4⭐️.

[Papersandsoul · Rating 5 out of 5]

After ending the relationship with her boyfriend, Claire is having a hard time and a random encounter with Christian leads to great fun! 🤍💙✨

Looking for a dual POV, standalone, workplace romance and a feel-good book??

Here you go — One Hundred Percent Mine is such a cute, funny and lovely STEM rom-com. Claire and Christian are such a combo! 💙

Everything was so good! Their first meeting, workplace banter and their chaos 😂❤️

Special mention to both of their sisters, I love them! Jake is another cute addition! The whole story you’ll see many kind people and it’s so nice!!

[Stacey T · Rating 3 out of 5]

Claire enjoys her work as a PhD scientist, but the company’s newest hire is making things difficult and putting the company’s mission to help patients at risk. After ending a two-year relationship, Claire hoped for a fresh start, but one unexpected night changed everything. Now she has to work with the man who kissed her and sparked something between them, but he acts like it never happened. Her life feels chaotic as she struggles to balance her feelings for two men: the one she wants and the one who is the father of her baby. Christian, a professor and consultant, is focused on helping his nephew manage Type I Diabetes. He never expects to fall for the scientist he’s paired with, only to realize she’s the same woman he can’t stop thinking about from a single kiss—and she’s pregnant by her ex. As they spend more time working together, their connection grows, but both know what it’s like to be raised by a single parent. They worry that trying for a real family could ruin everything, until they learn that families can take many forms and come together out of love.
I liked how the book shows the challenges people with Type I Diabetes face and gives a look at how scientific research tries to find cures or ways to prevent the disease. The characters and their relationships were fun to read about, though sometimes I wished they would just see what was obvious. The main characters had good chemistry, even if it wasn’t very intense, and the ending nicely showed that families can take many forms. Overall, it’s an enjoyable read with enough science to keep it interesting, but not overwhelming, and it has a happy ending for romance fans. I received an advance review copy for free, and I am leaving this review voluntarily.

[Brittany Steminist Booknerd · Rating 4 out of 5]

STEM MCs: both PhDs in science (I assume they are both biochemists or biomedical engineers based on their work but it’s never stated explicitly)
I highly recommend not reading this review if you don’t want to read spoilers.
I will start by saying that this book had a lot of tropes that I really don’t enjoy in it (surprise pregnancy, love triangle, miscommunication), so take my star rating with a grain of salt if you like those tropes. The anxiety and depression that the FMC suffered with was so incredibly relatable. I could very easily see myself in her shoes, and it made me so sad to read her experience. Luckily therapy is used in this book to help in different ways.
I feel like this book was written in 3 separate pieces that had very little overlap. There’s her work drama that totally fucking sucks, there’s getting a full education on T1D as a reader, and then there’s the baby daddy drama. There were some things in the first third of the book that made the timeline feel a bit off before they officially cleared the air of that initial misunderstanding. One thing is very clear though: every single person in the book has daddy issues. I wanted to shake both MCs at various points in the story from their daddy issues. The therapy twist in this book was interesting, and I think it helped to play a role in the HEA between the two men and how everyone was able to coexist and coparent successfully.
Although this book is book 2 of the GERI Labs series, you can definitely read this book as a stand alone. You do see the first book’s MCs in this book quite a bit and get a nice life update with them, but you don’t need to read that book to get into this one. I’m hoping that we get to learn more about Claire’s ultimate career decision in the next GERI Labs book, but at least the science killing witch bitch got her comeuppance!
Expect some very light spice.

[Alexis Escoto · Rating 4 out of 5]

⭐️⭐️⭐️⭐️ (4 stars)

I received One Hundred Percent Mine by Emma Aisemen as an ARC and am voluntarily leaving my review.

This was a very sweet, gentle romance that clearly knows its lane. The connection between the characters is soft, emotional, and rooted in tenderness rather than intensity. The pacing felt steady, and the romance focused more on quiet moments and emotional closeness than high drama or heavy heat.

Personally, I tend to gravitate toward books with more alpha-type men and higher spice levels, so for my tastes, this landed at four stars. That said, if you love a softer, sweeter, more understated romance, this is absolutely a five-star read. It really comes down to preference, and for the right reader, this book will hit perfectly.

Overall, a well-written, heartfelt romance that will especially shine for fans of cozy, quiet love stories.

[Robin · Rating 4 out of 5]

I love romance novels about scientists but you don't have to know or understand any of the science to enjoy this book.

There's a lot of miscommunication/misunderstandings in the later half of the book, typical plot moves to extend the story, and the HEA seems a little too quick and easy. But the first half of the book is brilliant. The characters are well developed with backstories to explain their motivations. The chemistry between them is excellent and they feel real and complete. I also appreciated the attention to detail when discussing real issues associated with managing Type I Diabetes and the continued search for a cure or better treatment options. I received an advance review copy for free, and I am leaving this review voluntarily.

[Bookish Heart · Rating 5 out of 5]

I thought I had liked the fist book in the series "A Symptom of Love", but this one? I absolutely LOVED IT . OH my goodness, it did NOT disappoint AT ALL. This book made me question everything I thought I knew about Type 1 Diabetes and everything they go through in their day to day. I admire people that have this condition and their caretakers, you are so brave. I just hope one day I could be like you. This book was funny, heartwarming and it definitely was eye opening. I am 100% gonna recommend it to everyone. I’m still thinking about these characters days later—this book definitely left its mark. Thank you to the author and publisher for the ARC.

I received an advance review copy for free, and I am leaving this review voluntarily.

[Dawn Marie · Rating 4 out of 5]

Well written, cohesive romance. While I'm not usually a fan of several of the tropes (accidental pregnancy, mis/lack of communication) used in the story, I found the storyline was able to overcome the usually pitfalls of said tropes very well. I appreciated the fact that the MFC had a supportive family willing to be there for her but that she was also able to stand on her own. She didn't need the MMC, but she wanted him. I also liked the fact that the subject matter the two were working on together was written in a way that I could understand what was being discussed and also interested me enough to do some further research on my own. Would recommend and look forward to picking up another one of the author's books in the future.

[Karen Wheat · Rating 5 out of 5]

I loved this story so much but it had me wiping my tears several times. I'm a sucker for found family & pregnancy stories. The bond Christian had with his nephew was so pure and wholesome. He really cared about him. He was fighting for him. It was more than just scientific research. It was life saving research. I could see the storyline being realistic. Having struggles with being with the biological father or the man you come to depend on. I am glad it ended the way it did. Its a great read if your a science lover and family lover.
Disclaimer her boss sucks!!!

[Jeenal · Rating 4 out of 5]

I really enjoyed this book and the incorporation of Type 1 diabetes research was icing on the cake. The depiction of the research that Claire and Christian were doing wasn’t too technical that readers can’t follow. I loved the relationship development between Christian and Claire as well as their own family relationships with Kate and Jake. Dual POV stories are my favorite. I like how the story portrays that families come in different forms and that a happily ever after is achievable.

I received an advance review copy for free, and I am leaving this review voluntarily.

[Vianna Kolene Pangelinan · Rating 5 out of 5]

✨ARC Review✨ This was one of those books to slowly take ahold of your heart, and I’m such a hopeless romantic just to put that out there. But omg I was actually crying, I was heartbroken and hurt and scared much like Claire was (who is the main character). I feel like my emotions definitely were all over the place but in a good invested way😊 I loved this and I’m so grateful to be given the opportunity to have been an ARC reader.

[Brooklyn Thomas · Rating 5 out of 5]

I absolutely DEVOURED this book! I think it might be my favorite over the first! The love story is just sooo freaking cute! Then you add in a guy who cares for his nephew like his own child?! Immediate swoon! Plus to top that off, he then accepts Claire’s unborn child as his own, basically from the get go. Dang!! This book was seriously adorable and the story line was so interesting. I was seriously hoping that Ryan would just not come back but I’m glad it all worked out how it did in the end.

[Sam Bailey · Rating 4 out of 5]

I reallllyyy enjoyed this book!!! It’s not a popular opinion but I love the pregnancy trope and this book does it very well! Ryan was the WORST for the majority of the story and I’m probably suppose to say he redeemed himself but I don’t think he did 😂. Claire and Christian were sooo perfect for each other and the relationship with his nephew was too cute. Overall, really great read!! 👏🏼🫶🏻

[Maria Rodriguez · Rating 5 out of 5]

I absolutely loved this book! It was so well written. Definitely worth reading. Such a cute romance book. I would love to read more of the authors work.

[Cathleen · Rating 5 out of 5]

I just fell in love with Christian--he was a perfect book boyfirend!

[Josie · Rating 5 out of 5]

I am so excited to have won a copy of this book! Very sweet and captivating.

[KG Reads · Rating 3 out of 5]

3.5 ⭐️ this was a sweet story. I always love a good science love story. Ryan pissed me off though. But overall an enjoyable story! 🩷

Thank you for the ARC!

[Brittany Kirkland · Rating 4 out of 5]

The way this GERI Labs novel had me hooked in from chapter one was pleasantly surprising! I can’t tell you how annoyed I was when I had to stop reading to do silly things like work, cook, and/or exist like a functioning member of society. Now, I will be the first to tell you, I’m not a huge fan of the miscommunication trope, but the way Emma Aiseman delivered it in One Hundred Percent Mine was top tier. This story had me high school girl giggling, crying, and then fussing at Claire and Christian to get it together.

Overall, if you are looking for a super hot book boyfriend, look no further than Christian. If you love a woman who speaks her mind and challenges those in her life, I implore you to check out Claire! This book is One Hundred Percent worth the read (pun intended)!!!

[Nicole Krista · Rating 3 out of 5]

Claire is fresh out of a break-up when she sees her ex--and makes the decision to kiss a random man to make her ex jealous. She ends up subsequently working with that same stranger, Christian, or "Dr. Forgetful-Pretty-Face." She also then discovers she's pregnant with her ex's child.

I liked that both main characters work in STEM, and that their relationship starts out rocky right off the bat because of their first interaction. Christian is a golden retriever-type MMC who is the sweetest uncle in the world to his little nephew. It's obvious that the author is passionate about Type 1 Diabetes awareness, and this comes through a lot in the story.

The FMC, Claire, frustrated me throughout most of the story. She has a lot of unresolved childhood trauma and hasn't been working on it the way she should: "It's been about fifteen years since my last therapy session. And I thought I had it all together... but maybe it's been too long." I was so happy for her when she did go back to therapy, but, bizarrely, the therapist only wanted to "focus on the present," which I don't think is a very helpful approach for someone whose childhood issues are resurfacing as she's pregnant with her own child.

Speaking of the pregnancy, Claire didn't act like she wanted to have the baby from the very beginning--she seemed put out about being pregnant--but she never let herself consider the option of not going through with the pregnancy? I'm just not sure I understood why she was forcing herself to have a baby she wasn't prepared for with a man she didn't even like and wasn't with anymore, especially because she was also falling in love with another man at the same time. I personally didn't get many of the decisions Claire made throughout the story.

Ryan, the ex, is also a part of this story. I disliked him for most of the book, as he was controlling, manipulative ("I'm either all in or all out"), and kind of a jerk to both Claire and Christian, but he made some strides towards redemption in the very end.

I received an advance review copy for free from BookSirens, and I am leaving this review voluntarily. Overall, I thought this was an alright read. Pacing-wise, I liked the first half more than the second. I enjoyed learning more about Diabetes.

[Teodora Maria · Rating 3 out of 5]

So this book is a 3,5 for me. It was good, I liked it, but the first 60% of the book was a bit boring for me, it wasn’t super boring as it kept me reading and I did enjoy it, the next 27% was fantastic and I enjoyed reading it, the next 13% was good to read but a bit frustrating because the characters didn’t comunicate, i think it needed 1/2/3 chapters more, with the hospital experience, and the epilogue for me was ok, because while I’m all for redemption, I don’t think R deserved one, because I don’t think his stances that based the books could change so quickly.

Overall it was a good book, it didn’t take me long to read, but I didn’t read it in one sitting.

Tbf I received this book as an ARC, and this is my honest review which I leave voluntarily.

[David Carriere · Rating 5 out of 5]

One Hundred Percent Mine is a fun, heartfelt, and emotionally charged romance that balances workplace tension with sizzling chemistry. Emma Aiseman crafts Claire and Christian’s story with warmth, humor, and relatable emotional stakes. From the surprise pregnancy to workplace rivalries and the sparks that fly between the protagonists, the narrative hits all the right notes for fans of STEM-centered romances. The dual POV adds depth, letting readers connect with both Claire’s vulnerability and Christian’s growing obsession, while the story explores themes of trust, found family, and personal growth. It’s a page turner that blends emotional complexity with lighthearted charm, perfect for readers looking for romance that’s smart, steamy, and heartfelt.

[Tracy Lynn · Rating 4 out of 5]

This is book 2 of the GERI Labs series by Emma Aiseman, although it can totally be read as a standalone. I thought this book was so sweet and I enjoyed the story so much. The book has such a great depiction of a child with T1 Diabetes and the struggles they face. Although I think the MMC was a little too lackadaisical, especially with the woman he “loves”, it is still such a romance that he would burn down the world for the same woman. I love the FMC is a strong female that could stand on her own, but chooses to ask for help from people around her. The characters had great chemistry and showed how not all families are shaped the same.
I received an advance review copy for free, and I am leaving this review honestly and voluntarily.

[Lindy's Reads · Rating 3 out of 5]

This was a sweet story, but the characters fell short for me. Christian was such a sweet and caring character, and Claire’s indecisiveness made her feel human, but also made her seem wishy-washy. The ex, Ryan, was definitely annoying, and I wasn’t a fan of Claire’s relationship with him—but it did demonstrate her struggle to do what’s best for her child. The multiple POVs added nice depth to the story. Overall, I did enjoy Claire and Christian's 5 it was good to see the continuation of Ellie and Aiden's journey, but I did find the miscommunication between the main characters frustrating.

I received an advance review copy for free on BookSirens, and I am leaving this review voluntarily.

[Gal V · Rating 3 out of 5]

I received an advance review copy for free, and I am leaving this review voluntarily.

I really enjoyed the characters of Jake, Kate, Christian, and Claire. I thought the story was sweet and I liked watching the romance between Christian and Claire. I however did not enjoy the love triangle aspect, as I found Ryan to be frustrating and not in a fun way. I also found the therapist character to be annoying but that may just be my bias speaking. I think the book people who like love triangles would enjoy this book. Just unfortunately that's not my thing. However, any part without Ryan (and the therapist) I did enjoy which is why I'm giving it three stars.

[Barb · Rating 5 out of 5]

When Claire saw her ex, she kissed the first man she saw at the mall hoping to prove she has moved on. Christian was surprised but could not get that kiss or the girl out of his mind. Christian has a four-year-old nephew, Jake, that has Type I diabetes. He is a scientist working on new medicine for Type 1 diabetes and will be working with Claire. This book has a wonderful story about what it means to be a family, what love looks like, and how important it is to communicate. Jake was so special in this story, surrounded by people who cared. I learned a lot about diabetes which was a plus.

[Melissa · Rating 4 out of 5]

3.5 rounded up.

Claire just got out of a lackluster relationship and makes an impulse decision to make him jealous and kiss a random stranger.
.... a random stranger who shows up at her office shortly after and doesn't even recognise her.

I liked the first half of the book, but when Ryan came back I lost a lot of interest.

I grew up without a father, but can't imagine even considering some of the concessions she and Christian made.

I also got so annoyed at how horrible her work environment is and how no one does anything about it.

(ARC provided by BookSirens)

[FerryLassReads · Rating 3 out of 5]

Thank you to Emma Aiseman for the ARC. This is a cute STEM romance with a few fun surprises, and the dual POV from Claire and Christian works well. That said, some moments felt a bit predictable, and a few plot points wrapped up too neatly for my taste. The academic/work setting is enjoyable and the characters have solid chemistry. It is a light, easy read for fans of STEM-flavored romance.