If you're looking for manga similar to Love Through Deception: An Omega Subdued By an Alpha, you might like these titles.
Kouetsu and Ginga ("There's No Way This is Fate" series) show how to provide first aid to an aching heart. Kouetsu and Ginga are in love with their old friend Yuuzen, who's only interested in girls. The two are overwhelmed by jealousy and loneliness every time Yuuzen heads to a motel with a new girl. They end up finding solace in each other's arms... This prequel takes a look at the depravity that occurred before Yuuzen became an omega.
Follow the story of Haruta, who just wants to support his ex Nachi, and so enrols in Teijo Academy. The ""Academy"" part isn't just a name; it's complete with all the trappings of the upper classes. There's even an Elite Four, who each excel at a different virtue: moral uprightness, along with physical, academic, and artistic ability. As the next in line in a family of politicians spanning generations, Haruta's partner Nachi is expected to also venture into the political world, and so to make this happen he breaks up with Haruta and enters Teijo Academy to follow in his father's footsteps. Despite having broken up with Nachi, Haruta follows him to Teijo, hoping to support him in his political endeavors. But Teijo Academy is for elites, where Haruta's sense of what is normal doesn't apply...
Omega Ryuusei, who has turned 20, is planning to marry α Ainosuke, his fiancée, at first. When Aniosuke brings Ryuusei home for the first time, his older brother Shion, who is also an α, is waiting there!? Ainosuke is kind and affectionate, while Shion, holds a strong desire to possess Ryuusei!?
The social studies teacher, Izumo has an unrequited feeling towards the handsome physic teacher, Muroto. Izumo had decided to bury his feeling forever, but Muroto suddenly asked Izumo to be his girlfriend?! At the same time, Izumo realized that Tomogashima, a male student he's closed with, also has a special feeling towards Muroto.
"Teach me, what is normal?" One day after school, the monitor Ryosuke witnessed the sex scene of Kanzaki, a school figure named Alpha, and his object was the troubled child Aiba. Ryosuke, who knows the secret of the two, has been involved in a twisted relationship since that day...? This is an era when Omega, who is easy to conceive, is being worshipped after the decline in birthrates has intensified. But behind that is an unimaginable fact...