The Switch

Set immediately after the events in Souja.
Duchess Contessina DeBaringer has been betrothed since infancy to the last man in the world she wants to marry. However- a year before the wedding to him and squeezing herself into the wedding dress, she comes under agonizing pain and faints.
Upon examination- she is diagnosed with incurable cancer and side sickness and given only months left to live. Two days after the diagnosis- an offer comes in for his second daughter Millicent's hand in marraige that is too good to pass up and her father accepts immediately.
However the offer is from a Baron Thaddius Salgria- of Salgria Shipping for his eldest son- Kragan. Who has spent his whole life on ships, either seaships or skyships. And Kragan is a natural sailor, when he's not designing, commissioning and building the ships himself.
And for Millicent- the insult to the injury is that Kragan and his family are orcs. Millicent is furious with the match and outright refuses.
So Contessina suggests that her father switch the marraige matches between herself and her sister. And to keep the news of her condition a secret- lest it be known and the family honor be ruined. Contessina and her father hatch a plan to pull it off. The doctors give her betrothed a fake but secret dianosis of being an horse riding accident and that she is now barren in order for herself to be released from the betrothal, which works. And the same lie about the horse riding accident is enough to ward off suspicion as to why she is taking medication to mask the symptoms of her real fatal illness to the Salgrias.
But upon meeting her new groom- Contessina realizes that he is her love match and everything she never knew she always wanted and needed.
So will she be able to keep her deadly secret to herself long enough to save her family from ruination- and more importantly- save Kragan from ruination too?