My Mate Is a Feline Gentleman: Yokohama ARC: Volume 4

Yokohama, Taisho era. Toushirou and the beastfolk Alex are happily married--and are blessed with a pair of adorable twins! Raising the children keeps Toushirou busy, but with Alex's loving support, Toushirou savors the happiness of living as a family of four. Then, one day, he is offered a translation job...