Can't remember the title or author

[rhimineecat71]

Can't remember much of this book, just that the woman was given (?) by the gov to aliens as a volunteer (not sure though if she was just abducted) as part of the peace treaty. She caught the eye of the alien king because of her violet eyes. She also kinda belly dances later in the story while pregnant. Her husband the alien king's anatomy saved him from an assasination attempt where his heart is actually on the right side instead of left. I think this was part of a series, and despite my description, the book is actually more of a romance than an erotic book. Can someone help me find the title? Pls and thanks.