Can Someone Please Explain What's Going On?! Volume 5

"I, Duke Cercis Tinensis Finalis, promise to love Viola Mangelica Fisalis, till the end of my days."Viola can't hide her surprise when Cercis says his wedding vows for real on their extremely belated honeymoon. And in his increasing romantic fervor, he names the sapphires mined in his territory "Viola Sapphires"! Now he wants her to wear them at parties to advertise them... What kind of humiliation play is this!? On top of all that, their capable servants' "Perfect Duchess" training starts heating up, too! Viola has a lot on her plate, and her newly awakened feelings for her husband aren't gonna make things easier!