My Mate Is a Feline Gentleman: Volume 1 (manga)

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...