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First Heat #1

First Heat

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Allie is a young omega, and her first heat is coming up fast.

The problem is that she’s never been kissed, let alone had sex, and the prospect of getting busy with a stranger to satisfy that primal need doesn’t interest her at all.
When Allie reluctantly chooses Sidney, an alpha who works as a heat helper at the local clinic, her expectations start to shift.

Between the heat hormones and his charming smile, Allie stands no chance and she’s about to discover a whole world of sexual possibilities under Sidney’s guiding hand.

80 pages, Kindle Edition

First published January 7, 2021

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Sierra Cassidy

24 books116 followers

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5 stars
314 (37%)
4 stars
266 (31%)
3 stars
187 (22%)
2 stars
61 (7%)
1 star
14 (1%)
Displaying 1 - 30 of 77 reviews
Profile Image for Isabella. R.
1,007 reviews2,243 followers
February 17, 2022
3.5 Sweet Citrus and Clove Stars ⭐

My new obsession with Sweet Omegaverse romances continues. With a case of cover lust, I was impressed that this tasty little morsel of a story delivered. Featuring an innocent and snarky omega none to pleased with having to use a service for her first mating heat and a more then capable Alpha to make the experience exceedingly pleasurable…

“Quit taking advantage of the fact that you’re super hot and a deliverer of orgasms. I have no defenses.”

Nineteen-year-old Allie is a college student too busy with her studies to have time for boys or mating heats. So she finds herself in a pickle with her heat due and no potential mates in site. Thus, the reason Allie finds herself paired with a gorgeous stud for hire Alpha she doesn’t know.

“Did you know you’re incredibly fucking cute right now?”

“Mmm, no, but you should tell me again. No one ever thinks I’m cute.”

“Well, everyone else is stupid then because you are completely perfect. Cute as hell, absolutely sexy, and you felt like heaven when you came on my cock like that.”


Phew things got hot very quickly but besides that, this authors style of writing was witty and relatable. As this is a book 1 with a HEA for now, I’ll be grabbing the next book and everything else she has written for my smut fix!!
Profile Image for Ms reads a lot.
500 reviews
September 17, 2021
2.5-3 stars.

This was ok. It’s short and steamy AF, without much of a plot.

Sydney is basically a stud for hire. He gets paid to “help” omegas through their heat. Allie is fast approaching her first heat, so she hires him to lend a helping hand (and other body parts). I found some parts of this book weird, awkward, and clinical. Allie has to see a doctor and sign a contract in order to hire Sydney. Then she tells her mom about it, who then proceeds to send her off on a one week f**k fest with a virtual stranger. Allie’s mom thinks it’s a good idea for Allie to take Mr. Bear, a.k.a. Allie’s teddy bear, on her sexcapades. Did I mention Allie is 19 years old?! Awkward!

After that weird exchange, there’s really not much more to this than Allie and Sydney boning nonstop. Then, it’s wham, bam, thank you ma’am, and Sydney off to help his next omega in need. I would have enjoyed this a hell of a lot more if there was more of a connection between h and H and at least a HFN, if not a HEA.
Profile Image for Rayne.
540 reviews153 followers
August 12, 2022
A fun, quick Omegaverse read about Allie going through her first heat. It was steamy and sweet and I’m onto the next one!
Profile Image for Merri Bright.
Author 34 books687 followers
November 9, 2021
Wow, HOT. Like, I was fairly certain I was having a hot flash, but no, it was this book. I was not super happy with the ending... until I realized it had a sequel, already out, and I could one click the heck on that, too. DO THAT. I'm into the next book and it's so lovely, gives the POV of Sidney. <3
610 reviews2 followers
July 20, 2021
If you want everything from her point of view, then ok it's fine. If you're looking for more it isn't there.
Profile Image for Alice.
1,921 reviews105 followers
January 20, 2022
While the overall concept was cute, I found the dialogue and writing to be very dry and clinical, and I didn't really feel the alpha energy from 24-year-old heat helper Sidney at all. I also thought the reactions of a 19-year-old omega virgin with her first heat weren't very believable.

As other reviews noted, this wasn't really a true romance, as the two of them separated to their own ways after the heat ended, and it was purely a professional transaction.
Profile Image for Patricia Ray.
Author 10 books22 followers
May 24, 2021
I was totally ignorant of the Omegaverse subgenre, but still enjoyed this a lot. So that says a lot about the writer's ability to create a world that stands on its own. The two main characters are sweet and caring but they do have an amazing week of sexual discovery together. Cassidy's style flows nicely and creates an easy read.
So, if you're looking for a great introduction to Omegaverse, I guess this is it.
And if you're wondering, why 4 and not 5 stars... I'm hard to get.
Profile Image for Chalice.
3,756 reviews112 followers
May 13, 2024
The couple: Sidney and Allie

Romance trope: omegaverse
Series: First Heat
Length: 80 pages

Plot: Allie is about to go through her first heat - and she's a virgin - so she goes to a clinic for a "heat helper." Sidney is a professional and is able to help her through her heat, but what happens if she wants more?

Commentary: I was a little in my feelings about this one because I though, nope, that is not a happy ending, that is not okay, I need a couple to have feelings for each other and bet together - and then the book ended. I should have checked - this is a trilogy. So while there is a bit of an underwhelming cliffhanger that feels like she simply had a good time and would have to live with the memory, there is more to the story, thank goodness.

Next book in the series: Second Chances
This entire review has been hidden because of spoilers.
Profile Image for Billie Yankie.
373 reviews39 followers
January 16, 2023
Swoon worthy but also kind of heartbreaking... I mean, it's the start of a few novellas but spoiler .
Profile Image for Drasevia.
190 reviews4 followers
November 5, 2023
Hmmm, Idk. It wasn't bad, but something was missing..? Maybe it was the slightly weird ending? Anyway, I will not read the second book, but still 6/10.
Profile Image for Kailey.
407 reviews3 followers
January 12, 2021
This was a hot novella and I have to give the author props for writing the first omega verse story I truly enjoyed. Sidney was respectable and genuine while Allie was convincing as a college student on the cusp of growing up. Lovely storytelling.

The only reason for four stars instead of five is because of how many times it was repeated that Sidney smelled like cloves and citrus. Once or twice was perfect. Every time she smelled him it was repeated and made me start skimming.
Profile Image for Irene Kiew.
633 reviews66 followers
October 9, 2021
Read it this morning, not sure whether to give four or five stars. I liked it a lot, but it was short, and therefore not as satisfying as a full story. I guess I'm settling for four stars.

I liked how Sidney is big on consent and he tries to get Allie to "use words" and ask for what she wants, because although he may be able to read her body language, consent shouldn't be implied and she may also have other sexual partners in future who can't read her well, so she needs to learn to articulate what she would like from her partner. He's so careful with her and invites her to explore without judgement, since it's not just her first heat but also the first time she's having sex. The way he takes care of her is any woman's dream, not just an omega's!

Why I said it's not a full story: It's literally just about them getting together to assuage her heat, so it spans a week and that's it. She signs a contract with him for this purpose, so theirs is a business relationship, and although it feels like they really connected during that week, he is a "Heat Helper" so he sleeps with lots of others too, whenever his services are required by other omegas in heat. So it's sort of like... he's a male escort, in a sense? He talks about his "work" in an altruistic way (because heat can be very debilitating for omegas and they need someone who understands what they'll need during that time, as it's the period when they're most vulnerable) but still, basically he's paid to have sex with women, although this is not his main job (he's a male nurse at the omega clinic).

I loved it enough to get the series because I wanted to see more of Allie and Sidney together.
614 reviews
December 7, 2021
Loved this! The writing was everything. It was addicting, fast-paced, concise, and so easy to read. I couldn’t put it down. This was such a fun, sweet, hot, feel-good read, and it make me smile and just feel happy. I loved the pacing, the story, the dialogue and banter, the omegaverse plot and details included in the story, the smut, the FMC (Allie) and MMC (Sidney), their chemistry, and how they were with each other. I immediately connected with them. They were so sweet together and were such great characters. This was in third-person POV (limited; FMC only), which I’m usually not a fan of and avoid, as I prefer and am more used to first-person, but I really loved how the third-person was done in this book (just like with Heat Play Love by this author, which I absolutely adored and loved). It didn’t give me the disconnect I usually feel when reading from third-person POV. Overall, this was so well done, and was such a great read. Now onto book two — can’t wait to see how things play out between them.😊
Profile Image for Nastia.
370 reviews9 followers
October 26, 2023
It was fine.
i couldn't decide what rating to select for this story 3 or 4, decided on lower mark. Why?
it's 100% my issue, i was not aware that:
1 - it's a series. but books/novella are kinda small 70-90pages each.
2 - i was not happy with the ending of this story. i got the idea, but i felt like it was kinda drama for drama in a wrapper of normality and expectations.
3 -mix of 1&2, i think this should have been a part of one book with all novellas, cause there was not so much going on in terms of plot, but nicely written smut intrigued me. and i was interested in this story, still have some questions but they possibly will be answered in next books.
4 - i'm not sure that i will read the second and third novellas. There are a big descriptions of each book so i caught spoilers and..if a book is around 85pages and you know almost whole plot? need to wait for THE MOOD to read the rest.

so yeah, nice, fun, steamy, but not enough of plot for me in this story. (totally me issue, i just expected more and got less)
Profile Image for Whitney (whtnymllr).
Author 1 book40 followers
January 16, 2022
Good for what it is, but not a match for me

What this is: a very short omegaverse story with several sex scenes, a virgin heroine, and a sweet and caring alpha.

What this doesn’t have: Much talking that isn’t dirty. The dynamics between alphas and omegas in this world are neither shown nor told…because that’s not really what the book is about. The book is about two strangers who are drawn by each other’s pheromones having sex.

All the chemistry relies on scent/physical/sexual compatibility. They cover job titles and food preferences, and that’s it. It all feels very transactional….which…makes sense. He is a legal prostitute, and he isn’t ready to leave his job because she’s special. There’s no happy ending here. (Their story does pick up in the next book 5 years later, but I didn’t get very far because I wasn’t all that invested in their relationship.)
Profile Image for Summer.
396 reviews
June 20, 2022
Allie is a sweet and very naive omega who is not happy with that designation. She is seeking help for her first heat and meets Sidney. He is an alpha and helps her through her first time. The two seem to click and the physical attraction is there. This is just a job for Sidney and while it was obvious he enjoyed their time, he was not emotionally connected to her. Allie was a bit awkward which I liked because it was real and believable given this situation. I did feel she was pretty immature and a bit dramatic given her age. Overall I enjoyed that it had some nice spice and was a short read.
Profile Image for Miriam.
658 reviews13 followers
May 12, 2022
I'm not reading many M/F books. RH is more to my taste. And my second favorite genre is Omegaverse. And it doesn't matter, if it's RH or M/F.

So, I had this novella on my list a long time. Because of the length, I didn't expect much. Plot wise, that is. Steamy, sexy times? That was what I expected. And I was right. One strange beginning, but after that it's a whole week of one sex event to the next. The chemistry between the two is good.

The ending was okay for me, because I knew beforehand that there is a sequel and that's not the end of the story between the two.
Profile Image for Faith Baxter.
Author 4 books23 followers
February 23, 2021
I really enjoyed this, one-sitting read.
Yes, it doesn't have the raw carnality and dubious or no consent of a lot of omegaverse stories, but for anyone needing an introduction to the genre. I would highly recommend it.
I loved that it was set in modern times and not a barren wasteland version of the earth.
Sidney is a complete dream come true, and Allie is a bubbling ball of nerves who accepted her fate by the end of the story.
Honestly, I loved it!
Profile Image for XxnightxowlxX74.
1,228 reviews8 followers
November 3, 2021
First Heat…

Getting ready for her first heat has her on edge and nervous. She decides to go through an agency and has to pick an alpha by his scent.
She finds one she reacts to and chooses Sydney. He helps her relax since it’s her first time and first heat. He pushes her out of her comfort zone and they really enjoy and like each other but after her heat they have to go their separate ways. Sad. They have a great connection but she’s his client.
Profile Image for Lady P ᘛ⁐̤ᕐᐷ.
174 reviews1 follower
January 13, 2022
Cinnamon roll alpha-lovers rejoice! This book contains one named Sidney who is top notch.

Omega Allie is new to having a heat (and anything involved in it) and utilizes an Alpha agency to help her through her first one. She lucks out with a perfect match who is very caring. This book is like a hug in that aspect and I enjoyed seeing Allie and Sidney interact.

This is a good intro book to omegaverse if you are new to it.
476 reviews1 follower
May 3, 2022
Sheer Escapism

Just sheer satisfying escapism, sensitively written and enjoyable. Mix a shy virginal omega in her first heat and a trained sensual contracted nurse whose job it is to assist with omegas in heat and you get one hell of a story. It’s not really romance as such but in another way if romance can happen in a limited time with defined beginnings and ends it is. Either way it was very enjoyable.
Profile Image for S. Booker.
2 reviews
July 4, 2022
This book was recommended to me, it wasn’t something specific to my taste but I wanted to see it through and make sure this author got her page count. 😊 I wasn’t a huge fan of some of the repeated words in this book and I had a hard time understand what the main objective of the book was supposed to be about aside from the very obvious. If you’re interested in straight smut this is a great book for you!
Profile Image for Brittni Shafer.
480 reviews6 followers
November 14, 2023
Absolute perfection

If you're wanting a sweet steamy pick me up, this is for you!! The storyline was everything. I wish I had a hunk like Sydney who took care of my every whim while I went through my period. I can't wait to read what happens next because these two can't be finished. I'll be crushed if this is it. Also if you need the perfect muse, there's a TikTok account by a guy named Jake and he's the absolute vision for Sydney 😘
Profile Image for Anastaciaknits.
Author 3 books49 followers
August 10, 2024
nothing special

This is straight up er*tica with zero plot. It feels like it was written by a high schooler and FMC was irritating and immature. I get it’s the innocent trope but she didn’t act innocent, she acted immature.

And the word ‘smirk’ was used about ten times in 76 page book. Overused words always results in the loss of a star in my rating, otherwise I’d probably give three stars. The MMC used similar phrasing throughout as well.
Profile Image for kay.
44 reviews22 followers
February 16, 2023
i really enjoyed this book! it really hit the spot for a ‘it’s 2am and i should really go to bed soon…’ kind of night. great for when you’re just craving some desperation in your FMC & looking for a sweet doting alpha. only 4-starring because it wasn’t very memorable or outstanding in the grand scheme of things.
Profile Image for This Bookshelf Is Filthy.
71 reviews16 followers
July 8, 2023
Rating: 4/5
Spice: 4/5
Platform used: Kindle
Keywords: MF, Omegaverse, Heat, Scents, Virgin FMC, Sexual Exploration, DP, Light Bondage

Plenty of spice in First Heat! Really enjoyed the sexual exploration for the FMC, Allie (Ω), in this book. I don't normally enjoy a very shy, naïve, virgin FMC but this worked. I did cringle at some of her internal monologue but at least she get crazy clingy. Sidney (A), the MMC, is definitely book boyfriend material, despite the short length of this book. Great short read, looking forward to reading the rest in the First Heat series.
49 reviews
October 28, 2023
Perfect

Even though this was short, it was exactly what I was looking for in a book like this. I love omegaverse, but I don’t love when first interactions are out of the mind with hormones. This book handled that perfectly. Then, with the added humor which made laugh, it was a perfect combination of sweet and spice.
87 reviews2 followers
April 5, 2025
Fun and sweet!

This was such a sweet and spicy read. I love the idea of an omega nervous about her first heat, never having been kissed. I love that this first in the series ends with a bittersweet parting for them, but they both know the score and understand everything as it is. I will definitely be continuing on with the next story.
Displaying 1 - 30 of 77 reviews