Ωの花が開くまで

Ω no Hana ga Hiraku made

Tanizaki Yuuki is an elite employee of a major American software company. He has been living his life as a "harmless omega" because he does not produce pheromones that could bewilder people, even if he is in heat. However, on the day he comes to Japan on business, he suddenly goes into heat. He has sex for the first time with an alpha male he meets and discovers the pleasures of being an omega. But the alpha man, Fujimine Kazuma, is a colleague at the company to which he has been transferred...! (Source: Kadokawa, translated)