Destiny’s Kiss (Legendary Bastards of the Crown #1)
Elizabeth Rose

Lady Annalyse Granville is a cursed second-born twin. Because of superstition and the fear that a second-born twin is naught but a spawn of the devil, she's been sent away to live her life with nuns.
When she returns to her father's castle once Christmas by request of her very pregnant twin, her destiny takes a turn. Her sister, Gabrielle is mistress to the King and pregnant, about to give birth. When she births triplets and the king orders them killed, the babies lives depend on Annalyse.
Highlander Ross Douglas hates King Edward and makes a plan to make him pay. Managing to get into an English castle on false pretense, his plans go astray when he spots Lady Annalyse standing under the mistletoe and decides to give her a kiss.
Can one kiss change a life forever? What happens that Christmas changes everyone's lives in ways they could never expect.