Fated Winter by Tessa Cole

Freedom is further from her reach than ever before…
I’ve been taken. Again. God, not again!
This time all of us — me, Sebastian, Cassius, Titus, and Hawk — have been abducted, dragged through a portal into the Winter Court where the Winter Queen wants Prince Sebastian to take his rightful place as heir, a title he abdicated the hell out of 300 years ago.
Now that the queen has her unwilling prodigal son back in her grasp, she won’t let him go. Ever. And if she learns the truth of who we really are, she’ll kill the rest of us.
The only thing blocking her end game: me and Sebastian’s lie that we’re married — bound together by powerful fae magic that can only be broken by death. And as an angel unable to give Sebastian children, I’m not exactly the queen’s first choice for her son’s bride.
I’m worse than back to square one. The guys will do anything to protect me, and we’ve only got a small window of time to get out of the Winter Court before the assassination attempts begin.