Heart Change is the 8th book in Owens' Celta HeartMates SFF romance series. I bought a used copy a while back.
Review:
Content warning: Animals in peril, and one of the main characters has suicidal thoughts at the beginning of the book.
Signet D'Marigold believes she is doomed to be alone. Her parents died during her Third Passage, and none of her friends have ever stayed by her side or kept in touch for long. No one has ever been able to figure out what her Flair is, so she feels useless and lonely until the young prophet, Vinni T'Vine, tells her he's had a vision that her Flair can help his young brain-damaged HeartMate, Avellana Hazel, survive her First Passage.
Signet isn't the only person enlisted to help Avellana. Cratag Maytree, a personal guard for the T'Hawthorn Family, is hired to be Avellana's bodyguard. Cratag is secretly hurt to be hired out like this - he thought T'Hawthorn valued him more, and he'd prefer to be there for Laev Hawthorn's upcoming Passage. Still, he'll do as he's told, and he's certainly looking forward to spending time around Signet. He'd met her several times before and been attracted to her, but he's sure a beautiful and well-bred lady like her couldn't possibly feel the same about a man like him, a scarred outsider with little Flair.