If you're looking for manga similar to Marking Omega, you might like these titles.
An omega who was pretending to be a beta is suddenly the mate of a top tier alpha!? It happened one night on their way home from a company drinking party. When Mr. Hashida takes care of the drunken Mr. Hayashi, just a small amount of Mr. Hashida's omega pheromones is enough to drive Mr. Hayashi into a frenzy. Despite his resistance, Mr. Hayashi not only has his body taken, but Mr. Hayashi bites his neck indicating that they've become mates. However, it seems Mr. Hayashi remembers nothing from that night... Mr. Hashida considers himself lucky and continues to pretend to be a beta. He decides to hide that he's his mate forever, but Mr. Hayashi (an alpha) keeps desiring his body!
Shiba, a high school PE teacher, is dating Higaki, the school counselor. After school, when the counseling room is closed, It's time for them to indulge in their secret affair. But Shiba had a problem with meeting his lover at work. Higaki, on the other hand, never uses the word "like". However, Higaki who is somewhat mysterious and elusive continues to take the initiative both in their love life, especially in bed. Shiba intends to discover the truth about Higaki, but...!
Mr. Murakami and Mr. Sasakawa have started their jobs at the same high school. Mr. Murakami, the math teacher, is outgoing and friendly, which makes him popular with the students. On the other hand, Mr. Sasakawa is rigid and guarded. Their relationship starts the night they go out for drinks with their colleagues. Mr. Sasakawa sneaks out early, but Mr. Murakami follows him, and demands they drink one-on-one. Mr. Sasakawa has a little too much, and can't even walk straight. Luckily, Mr. Murakami catches him before he hits the ground. But, then, he strokes Mr. Sasakawa's cheek and kisses him...!
Ikeya is good at his job, his colleagues look up to him, and he can always be relied upon. He just has one wish: for a guy to top him. He plays with himself every night and is desperate for the real thing, but unfortunately, he's a scary-looking alpha, making it almost impossible to find a partner. One day, Yuuhei Shimamori, who happens to be an omega, starts work at Ikeya's company. He may look like a carefree playboy, but his diligence soon catches Ikeya's attention. However, when the two of them are alone in the office one night, Yuuhei goes into heat! Pheromones overflowing, he tells Ikeya that he needs an alpha, or his symtoms won't stop... Ikeya can hardly control himself, and at his limit, asks Yuuhei to top him!
On his first day at his grandfather's pharmaceutical company, Leo Shindo (alpha) meets an omega for the first time ever. The only omega in the company, Amasawa is developing a heat suppressant that would work both on alphas and omegas. Leo passes out from Amasawa's good looks after exchanging a few words with him when they first meet. Leo finds himself smitten with the attractive Amasawa, but is shocked when Amasawa, who usually draws a line between his work and personal life, asks Leo to help test his new suppressant in their private time.
Public school science teacher Rinko Kanzaki spins in circles after the highly popular and skilled-at-his-job English teacher Haruomi Niwa tears her pamphlet apart and tells her to remake it. Rinko's never gotten along with Haruomi... however, the two are hiding their casual relationship from the school...! Even teachers have secrets they can't tell anyone! Don't miss this bitter love story between a skilled, serious, and popular English teacher and his unskilled science teacher coworker!
Shirane is a high school teacher and omega who tries to lead a regular life. When he is put in charge of a school trip, he meets his high school classmate Kiyonari again at a meeting with a travel agent. While he feels nostalgic, he is affected by Kiyonari, who is an Alpha, and is suddenly attacked by heat. When Kiyonari finds out that Shirane is an Omega, he offers him a proposal to take care of his condition.......?
Souta Miyano has a secret. He's weak when it comes to being played with from behind and desires something other than his finger to satisfy his needs. One night out, he gets too drunk and a coworker comes to his aid. It's then that he accidentally exposes his secret. Little did he know, their time in the bathroom stall that night would be just the beginning of more pleasures to come.
Shinobu Urakawa is a dull office worker in the daytime, but at night, he turns into a playboy who can seduce any guy with a glance. He’s a top enjoying his double life… until Hikaru Omoteya, the detestable narcissistic “prince” of the sales department, turns up at his favorite gay bar. Even though Hikaru is straight, he seems to enjoy the bar and keeps coming back, preventing Shinobu from enjoying his usual nightlife. But Shinobu realizes that Hikaru looks interested in him, and decides to use his charm as a weapon to regain his night oasis!