The Clumsy Omega
Harumi is a competent CEO and alpha, and Kazuma is his omega employee who cannot walk across a flat surface without tripping and landing right onto his boss due to his clumsiness. When Kazuma goes into heat, Harumi thinks he's done it on purpose to seduce him and goes along with it, but it turns out it was yet another accident. Still, that's enough for Harumi to realize his feelings, and he's no longer going to let Kazuma go, even if Kazuma's worried that their social spheres are worlds apart. Very much a comedy smut without much substance, but it's fine. Trigger warnings: dubcon(heat), noncon, attempted gangrape, attempted rape.
Maku ga Oritara Bokura wa Tsugai
Mitsuki is the number one idol, but he's hiding his omega gender. Mahiro is the overly friendly number two idol, but when circumstances force them to perform together, it ends with Mitsuki going into heat. Mahiro sleeps with him and offers to bite his neck, pairing with Mitsuki so others won't notice his pheromones in the future, and Mitsuki agrees. Now the two are put into a unit together while also getting used to their basically contractual pairing. But Mahiro's feelings for Mitsuki go much deeper, and the more time they spend together, the more Mitsuki starts to come around. Continues into their relationship. Trigger warning: forced outing.
Ore no Tsugai ha Thoroughbread Omega
Leo is an alpha and a second-generation actor who's working his butt off to be taken seriously, which is why it drives him crazy to see Eito, another alpha second-generation actor, who always seems to be messing around. But when the two get cast as leads in an alpha x omega romance movie, Leo is shocked by Eito's talent. Then, when they're made to spend the night together to increase their chemistry on set, Eito reveals he's really an omega and the two begin a physical relationship that can't seem to be stopped. I like both the main couple and their friends and I think this one has really well done characters, which can be hard in so few chapters. Trigger warning: forced outing.
Marriage of a doting alpha and stray omega
Alpha assaults an omega, offers to marry him but not mate after.
Unmei Ijou, Koibito Miman. - Douki no α to Jouai Keiyaku
Airi Yamashita(beta→omega) is a driven career woman who just lost out on a promotion to the handsome Ren Kugayama who entered the company at the same time as her. But when they go out for an office drinking party, Airi totally loses control of herself and sleeps with Ren. The next morning, he tells her it's because of her omega pheromones, and sure enough, the doctor confirms that her gender has changed. Ren then offers to help her deal with her heats, but what he doesn't tell Airi is that she's his fated pair and he's noticed her pheromones for a long time. Trigger warnings: drunk sex, drug(roofie), attempted rape.
Pendulum: Kemonobito Omegaverse
When Kai was still just a child, his father dumped him on the footsteps of the beastman Ruado just because he was an omega. Ruado took him in without really understanding why he did it, and since he's raised Kai lovingly, trying to let Kai pursue everything he wants without being held back by his omega gender. But now that Kai is an adult, he should have reached his first heat, but it still hasn't happened. What Kai doesn't realize is that Ruado hasn't told him everything about his omega gender and what that will mean for the two of them. Trigger warning: child grooming.
To Make A Delicious Omega Squeak
In an omegaverse/beastman world, Sachio Kurumizawa is an omega mouse, possibly the worst combination as he's prey to pretty much anyone. He works as a manga author to support himself while leaving the house as little as possible, but to make matters worse, his editor Ukano Shinobu is an alpha fox, the natural enemy of a mouse like him! When Sachio goes into heat due to a drug, Ukano offers to help him get over it faster by having sex, so the two begin a physical relationship, but Sachio finds it hard to trust anything the seemingly carefree fox says, especially when Ukano might just be trying to eat him, after all. Second volume follows their relationship after they start dating. Trigger warnings: drug(heat inducer), attempted rape, cannibalistic themes.
Shingeki no Kyojin dj - Fan Service - Omegaverse
An Attack on Titan Eren x Levi dj. Set in an omegaverse world, Eren is a high school omega who deals with the frustrations in life that come along with his unusually powerful pheromones by listening to his favorite band and the lead singer, L-san. Eren has always known that L was his fated pair, but he never thought they'd actually meet, until he got the legendary fan service ticket that allows him to meet a band member of his choice. Although Eren doesn't plan to let L know that they're a pair, the moment they meet pheromones take over and things get a little wild, causing Eren to flee in a panic. But L, real name Levi, is extremely possessive of what's his, and he's not about to let Eren go. Not a healthy relationship, but an interesting one. I liked it for what it was. Trigger warning: dubcon, abusive behaviors, strangulation.
A Sadistic Cop Won't Let Go of His Destined Omega: I'll Teach You How to Have Sex in Heat
Ichika is a romance writer who's editor suggest she goes to a host club to get more experience for her writing, and she's almost date-raped until the police bust in and police officer Jin ends up taking care of her heat, instead. Turns out, they're a fated pair. Not particularly interesting straight omegaverse smut. Trigger warnings: drug(aphrodisiac), dubcon.
Antimoral Omegaverse