If you're looking for manga similar to Shinai Naru Omega e, you might like these titles.
Seo Yian is a Beta butler servicing the handsome Alpha CEO, Yoo Jekwon, who he is in love with. However, Mr. Yoo has an Omega lover, forcing Yian to restrain his feelings of yearning and desire. But once Mr. Yoo and Yian found out the Omega lover's infidelity, Yian started to make his move.
Aoi’s dream is to be a best butler just like his grandfather and suddenly, temporary employment agency calls him that there’s one job available! However, he has no idea that his new boss would turn out to be a pervert!
Leading a life without any inconveniences, the prominent Amamiya household’s heir, Amamiya Ujou, is jaded and dissatisfied. One day, his uncle’s illegitimate son, Yohira, appears before him. Fearing the son might kindle a predicament in the future, Ujou decides to preemptively take care of it. Having been found wan and frail in the slums, Yohira is to be sent to an orphanage. However, fascinated by the boy’s subtle allure, Ujou brings him back to his mansion. Tonight he’s going to… Examine his body?
When Toushirou is hired as a servant for beastman diplomat Alex, he fears the very worst. As an omega, he’s gotten used to being treated as a mere plaything, and he prepares to once again “serve” his feline master. But to his surprise, Alex is appalled by the treatment of omegas in Japan and treats him with a kindness he’s never experienced before. Little by little, Toushirou’s feelings begin to change...
Yoshii an exceptionally beautiful boy arrives at the Hasuda householdas a servant, Rui is entranced by his unwavering loyalty.
Young Master Motoi lost his mother at a young age, just after Sumiya, a butler to the Nikaido Family, had been assigned to care for the Young Master. As a result, Young Master Motoi becomes attached to Sumiya and eventually asks him to wear a maid's dress. Sumiya kindly complies with the Young Master's wishes up until Motoi is sent to boarding school. The first few days were hard for Sumiya, and then those days turned to weeks, then months, and after seven years apart, Young Master Motoi comes back, but he is definitely not as ""Young"" as he used to be! What will come of Young Master Motoi's homecoming? Will the Master/Servant pair be as attached to the hip as they once were... or more?