Oops! I Summoned A Demonic Merman

Witches Love Monsters

by Naomi Lucas

One moment I’m within my domain in the abyss, and the next…
She’s in front of me with a steam cleaner in her hand.
Her name is Grace… but I’m in no threat of falling, feeling hexed…
With her, I’ve ascended, on land.

Now she wants to get rid of me, saying I’m an accident.
Unfortunately for her, I have no intention of leaving without a taste.
I plan to stay until she’s flustered, wet, and bent out of shape.
Then maybe I’ll give her a reprieve, after I’ve had my fill of the chase.

-Sepher, Duke of Hell


Witches Love Monsters features short, fun romps from some of your favorite Regine Abel, Opal Reyne, Naomi Lucas, and Tiffany Roberts. Each book reads as a standalone

Genres: Monster Romance, Paranormal, Monsters, Paranormal Romance, Romance, Fantasy, Magic

154 pages, Paperback

Published January 27, 2026

About the author

Naomi Lucas is an indie author. She loves being creative whether it’s with painting, writing, or making little jingles about her dog, Barracuda, or her cat, Daliah, in the car.

Reviews

[Lindsay]

I’m so disappointed this was title that I was most excited for when I saw the series and this just fell flat. I know, I know… it’s a novella, but the plotting on this needed a novel or to be reframed. The ending was so abrupt and the relationship was not explored enough. Also, aspects of this book straight up pissed me off…WHY did Naomi Lucas (a favorite SFR author of mine) feel the need to end this story by having the couple have literally 100s of children? And why did it have to happen so soon after meeting? This is baby trapping a woman times 100!

Now that I got a tad bit of ranted questions of my chest, let’s talk characters and plot. Our FMC is Grace a human woman who is very lonely but also connected to her family which she does favors for. These two collide when Grace, helps to clean up her parents rental after it was booked. Sepher is a Duke of Hell and a merdemon (yes, merman… I was hoping for King Triton and instead got Prince Eric with a tail. Not optimal.) I was so pumped for this story, but Sepher came off as bland and self-important because of a lack of context in his background.

Grace gets a bit screwed over when she finds her parents house ransacked by a coven of witches, who junked the place up with residual summoning circles and spent condoms. Idk, this whole setup left me with too many questions. How does this world even work… witches are common knowledge and their so bold as to trash an Airbnb. It was treated as normal that witches are out in the world, but by never leaving the cabin this story was done a disservice. It is completely fine to build a world with different social structures, norms and mores. In fact it something that Naomi Lucas kills at in some her other series such as the Naga Brides and the Cyborg Shifters.

2.25 stars that won’t stop me from reading a new release from Naomi Lucas or finishing up the series.

[Cat H]

3.2 stars.
I had a feeling this one would be my least favorite of the collab, and unfortunately I was correct.
I did like Sepher. He was mischievous, and I always love the ‘I only like you’ kind of character.
But that ending??
What the fuck was that? He’s a Duke of hell, they both have magic. You’re telling me there was no other solution to their living situation? 🤦🏻‍♀️

[spicykatzreads]

First 50% was so fun

[Poppy || Monster Lover]

Sepher was mischievous and antisocial, with an intense and rapid onset desire for Grace. Grace was lonely but determined to make her own way in the world. She wasn’t as wily as one might hope someone to be who accidentally summoned a demon, which led to some… expectations. Sepher was no hero, definitely pushing for more at all times, but I like a little darkness.

Spice: 5/5

Triggers: dubcon, involuntary pregnancy (she didn’t know he could get her pregnant while she was on birth control, pregnancy lasts a few hours before egg sac laying, which is off page), kidnapping, loneliness, hell, mention of past cheating, mention of past SA/attempted SA of minor, mention of past fire, mention of torment,

[Sophie]

-1 star for the random sac birthing and hundreds of children?? 😂😂 Also why couldn't they figure out a better living arrangement at the end..lol but I did like it, and now I definitely want to read more by Naomi Lucas 👀

[Kelspar]

2.5/5

Initially I thought this was fine. Kinda meh, but a typical Kindle Unlimited book so that's expected. What ever

But the ending. Good God. HUNDREDS of kids/spawn??? Hundreds??? Fucking horror show right there. Had to round down to 2 stars for that.

[Ally]

-5/5 🌶️

FIRST OF ALL, DO NOT READ THIS IF YOU DO NOT LIKE HAVING LIPS/TONGUE NEAR YOUR EYES.

With that out of the way, FUCK THIS BOOK. I don't usually use such strong language when I dislike books but there was way too much about this book that I hated hated hated. Too much of this book rolled my stomach wrongly, I actually had to gag a few times, and I take back what I said about the last MMC being my least favourite.

Sepher is THE WORST MMC I have had the displeasure of reading. He is a bully and manipulator, and the book confirms this multiple times; him commanding her to just give him her 'water' when she points out that she needs to give it willingly, him bodying her in the bathtub and essentially pining her to force her to agree to fucking him because he is 'done with the teasing', "Sepher will get his way once again", him FORCING HER PREGNANT AND THEN LYING THAT HE DID SO. He is the creepiest, most pig-headed MMC I have ever come across.

Grace was honestly just a body. She felt like a doll with no personality whose entire purpose was just to be fucked and controlled by this arsehole of a demon. I cannot say much about her other than WHY THE FUCK WOULD YOU LET SOMEONE YOU DO NOT KNOW LICK AND SUCK ON YOUR EYEBALLS YOU FUCKING WEIRDO.

Spoilers/Triggers ahead:
Now the smut. I have never physically felt my clit try to force its way back inside my body but thanks to the smut in this book, I now know what that feels like. We start with Sepher licking her eyeball and then closing his mouth around her entire eye to suck on it that doesn't get any better during this scene because later he runs his tongue over her eyelashes because he likes the feel of them scratching his tongue. None of this gets better in the slightest. But, hold up, the worst is yet to come. The last smut scene we read is very S/A coded, especially since Sepher admits in his POV that he is willingly impregnating Grace without her consent or knowldege then denys that this was his plan when he mentions it. (She then, somehow, gives 'birth' a few hours later.)

I thought with the epilogue we would get something to tie everything off, but instead we get a 5 YEAR TIME SKIP where she has given Sepher hundreds of babies who are only now just meeting HER parents, and they are only just finding out about it now. FIVE YEARS LATER. And are somehow cool as fuck over this all.

I wish I could remove this book from my brain. It has, singlehandedly, made me never want to pick up another book by this author.

[Eef]

Look, when I start a series, I tend to finish it… however, I'm currently second guessing myself. This book was equal parts hilarious and horny. Imagine you accidentally summoned a merman from hell and than decide you're going to f*ck it. Not to mention the giant breeding kink that you just stumble upon and of course the mild cnc. Nonetheless, I thoroughly enjoyed myself.

Plot weak, but not FOR the weak. Characters; hilarious. Spice; immaculate.
🌶️ 4/5

[Shiro Kitana]

Nope. Nope. Hellll no. I thought it was weird when he was literally sucking her tears from her eyeball but I stayed. I don't know why but I finished and ended with her literally spawning hundreds of children. Ummmm okay.

[christinac_reads]

ngl this gave me the ick.
non consensual egg laying gave me the ick.
random child abandonment gave me the ick.
she gave me the ick.
he gave me the ick.
the bathwater gave me the ick.
her moms dress gave me the ick.

[✨ Just Another Bookwyrm ✨]

This was less romantic and more sexual. I didn’t really like either of the characters and Sepher was SO arrogant and presumptive and he never really got better, Grace just eventually accepted it/him. I don’t think either of them either said or thought that they loved the other. I found parts of the story fun though.

[Blue]

3.5 Stars
⬇️⭐️⭐️⭐️
What? Noooo! I need more! Or at least another epilogue where she’s not mortal and with him! It mentioned that she’ll be with him when she’s done with her mortal life but I need to read about it!! It ended with her introducing her parents to their kids.

Sigh, I did really enjoy it and clearly wished for more and I love that he’s a v and anti social.

[Kay’s Book Club (◡‿◡✿)]

proof that I will read anything

[Caitlin]

Grace never meant to summon a demonic merman—especially not Sepher, a Duke of Hell ripped straight from the abyss and deposited into her life mid–steam cleaning session. Stuck back in her childhood home and desperate for money, Grace has no patience for an obsessed, seductive sea-demon who insists their meeting is fate. Unfortunately for her, Sepher has no intention of returning to the depths without first claiming her attention… and possibly her heart.

This is a fast, fun paranormal romp that mostly delivers what it promises. Grace accidentally summons Sepher, an obsessed demonic merman Duke of Hell, and the resulting chaos is flirty, funny, and briskly paced. I genuinely liked what we got: the writing flows smoothly, the story moves quickly, and Sepher and Grace are compelling, well-matched leads who carry the novella with ease. That said, it left me wanting just a bit more. Either a longer runtime to explore the questions it raises, or a tighter scope to avoid that itch. Still, it was an enjoyable read, and it definitely pushed me to finally pick up more from this author.

3.5/5 Short, spicy, and just a little unhinged (in the best way).

[Trixie Woodlawn]

All Grace wants to do is clean her parent's rental when she summons a demonic merman instead. And the biggest problem is just how obsessed he gets with her.

What I liked: I've never read a Naomi Lucas book I didn't like. This one was very fun/un-serious & the smut was top-tier. Also a quick read!

Why Only Four Stars: The freaky merman spawn. I couldn't do it. It was so glossed over and then at the end it wasn't.

Who would like this book: If you like Lucas's other books, this one is great! A little shorter than her norm, but still packed full of action and spice.

Comp Titles: The Scarecrow's Queen, Kimberly Lemming books

[Angela Plumeria]

This one’s getting a good review from me and I am not the target audience. I generally don’t like merpeople romance but this was super fun and avoided the tropes. Novella length.

Sepher is a lonely by choice merdemon and we get a lot of POVs from him that I enjoyed. Steamy hot demon, pun intended! I liked the different take and avoidance of tropes.

Interesting choice for the ending and leaves a lot to be resolved, but pretty complete for the short length. Not a ton of action so feels a little cozy but it was a fun time and now you must excuse me to go stalk this author’s other work!

🧜‍♂️🖤🧙‍♀️

[Airaseem]

I LOVE the MERDEMON! Wished the book was longer especially his POV and more intimate moments! I felt that the beginning dragged a bit for them to be romantic especially for a short novella. But I LOVED THE PREMISE OF THE STORY! Super fun monster read!

[Theo Jack]

I really liked how this started, and while I understand this is a novella, it ended abruptly. I would’ve like to have a little more of the relationship dynamic before the story ended.

[Tima]

Read in KU

[Nicole]

Sepher and Grace

[Emily-Anne Andersen]

that epilogue was straight out of a horror movie and i fear i loved it and it could’ve gone longer

[Jordan]

I know this is a novella but this literally just hard stops. It's whatever, but it threw me off a bit to go from their second summoning to five years (and hundreds of children?!) later. But hey, pop off.

[Courtney H]

I love the naga series so know Naomi can do great monster romance, but sadly this just fell flat for me. There wasn’t any plot. The descriptions, timings and speech were all over the place. It feels like this novella was written over a long weekend without proofreading or peer reviews.

[Rose]

I really didn't enjoy this. The MMC comes off as really rapey, the FMCs backstory is confused and her magic doesn't make sense, and the sex was too weird and not sexy. I'm not a big spit girly, so some of the scenes almost made me gag. Really not for me.

[Galateea]

If you give me a short story with demons, witches, mermen, and egg-laying, I expect the descriptions to be more descriptive.



I mean, hellllooo???

Where are my entire pages of filthy smut? Why do they seem like they are missing chunks of it? Why is the ending so rushed? Where is the detailed merman dick?



And yes, I am aware this is not a full novel, but a novella, but still... I felt that there were entire paragraphs just missing because the action was jumping from one part to another, and I had no idea how. I had to go back at least 4 times to reread some parts to make sure that I hadn't miraculously missed entire scenes.

I didn't.

And just to be clear, I never go back to reread parts because I never skip parts, so I never get confused.

I feel robbed. Where is my kinky mermen porn? Why is it so mild and short and... not that descriptive? Why is the egg-laying an afterthought? Why did we fast forward at least twice?



How many times did they boink off-page to end up with hundreds of kids, and why was this process not laid on paper in excruciating detail?

I demand compensation in the form of longer, more developed scenes that actually feel connected. In this case, more is definitely better.

[Nevena]

🖤 “You are the only offering I want, Grace.”
~~~
Grace is a strong, resilient and fiercely independent woman. And she’s very caring and compassionate, too. She’s a wonderful woman and I really liked her.

And then, there’s Sepher - the demonic merman Duke of Hell! He is dangerous, cocky, possessive and obsessive. And he’s quite mischievous, determined and charming, too. Sepher is definitely not a good guy and, yet, I liked him nonetheless.

I loved everything that happened between Grace and Sepher! Grace had never had any intentions of summoning a demon, especially a Duke of Hell, but here she was - in her parent’s summer house with a demonic merman on her hands… And unfortunately for her, Sepher had no intentions of going back to Hell without first having a taste of her. I really liked Grace and Sepher together! Their chemistry was off-the-charts and I loved all their interactions - the tension, the bargaining and the bickering. Even more, I really liked how well they fit together. And when they gave into the undeniable attraction, the passionate moments they shared were smoking hot and I couldn’t get enough of all the naughty delight. Grace and Sepher were definitely a match made in… hell, and deserved to find happiness and love together.

Overall, Oops! I Summoned A Demonic Merman is a quick, fun and naughty story and I enjoyed every page of it!

[Adrianell]

I loved the premise and most of the story, the ending lost it the 5th star ;)
Grace was a witch terrified of her own power, and after accidentally using it years earlier, she never used it again. Her parents asked her for help cleaning their lake house after a local water-witches coven stayed there. Trying to clean a summoning circle the assholes painted on the master bedroom's carpet, she accidentally summoned Sepher.
Sepher was a Duke of Hell, a demon merman who loved solitude and never sought company in Hell. The only other person he sometimes met with was his sister, but he couldn't stand her and hadn't seen her in a long time. He was surprised to be summoned, but his mischievous nature and curiosity about the pretty witch made him tease and play with her. The longer he stayed in her presence, the more he wanted to keep her for himself.
It was a hot and steamy story, and I liked both characters, but the ending wasn't my favorite. That Sepher impregnated Grace during their first time together was a bit much, and felt like baby trapping her. The fact that in the epilogue, in five years of their unusual relationship, they had hundreds of children was fucking weird. I also was a bit miffed that a powerful demon and a pretty powerful, if inexperienced, witch didn't find a way for him to transform, even temporarily, into a landwalking form.

[Shantell]

Oops! I Summoned a Demonic Merman was not for me.

This one had an interesting premise, but the execution did not work for me nearly as well as the other books in the series. The pacing felt off from the start, and by the time the story finally got where it was clearly trying to go, I was already annoyed and checked out.

My biggest issue was that the book kept undercutting itself. Whenever it seemed like it might settle into a real emotional moment, build meaningful tension, or strengthen the relationship, it would immediately swerve into something absurd, awkward, or distracting. Instead of feeling seamless, the story felt messy and strangely put together.

The romance also did not land for me. I never fully bought into the chemistry, and the slow build did not feel rewarding enough to justify how long it took. Compared to the earlier books, which were much stronger at balancing heat, plot, and momentum, this one felt weaker across the board.

There were also details and plot points that raised more questions than interest for me, and at least one major thread was dropped in a way that made the story feel even sloppier. By the end, I was more relieved to be finished than satisfied by how it wrapped up.

Unfortunately, this was the weakest book of the group for me.

2 stars.

[Kelly]

Grace was only trying to clean up her parent's rental when she triggered the summoning circle left behind by the last renters and suddenly she has a roomful of merman. Demonic merman, so be specific. Sepher isn't thrilled to have been summoned, but he's also pretty darn intrigued by the human with the tasty tears and sexy body.

So he does what any self-respecting demon would do and makes a deal with Grace. And in typical demonic fashion, he makes sure the terms are in his favor. To be fair, why should be give up the tasty human treat now that he's found her?

On Grace's end, she's understandably confused on how she accidentally summoned a demonic merman. While she has magic, she shies away from using it after a bad incident years ago and she doesn't quite know what triggers her abilities. Turns out a sexy demon in the bathtub is the answer.

A grumpy demon who is about to find his match in the human realm, a lady who doesn't fit in until she does, and a watery hellscape that's perfect for raising little demonic merkids. Grace and Sepher are worlds apart, but they work!

-Kelly @ Reading the Paranormal

[Laura R]

Grace’s parents rent out her childhood home as a bnb, but when the last guests leave and Grace goes in to clean, she finds way more than she expected… including a summoning circle painted onto the floor of one of the bedrooms. When she accidentally uses it to summon what she can only describe as a demonic merman, all she wants is for him to leave so she can finish cleaning. But Sepher has found something he likes, and he’s determined to have her.

Now THIS was a spicy meatball. From the moment Grace accidentally summons Sepher, I wasn’t sure how I felt about the whole situation. Not because of anything but because Sepher was a little annoying? But the moment they got together and what turned from one quick encounter quickly becomes a lifelong thing was actually great. I loved the romance/spice in this, but I think what should’ve been a five-star read was the whole plot/character dynamic. Like, we got a great introduction to the two, to the worldbuilding, and the characters were quick to fall for each other in their own ways, but I will say that I do wish Sepher was a little more likable aside from how hot he is. I just wanted a little bit more from him.