Spar With The Devil is a chase movie, a romance and excellent science fiction. There is rough sex and there is considerable violence.
I was a beta reader for this book and it was an immense pleasure to read. A contemporary setting soon shifts (by teleportation through one of those Portals mentioned in the series name) to a rugged desert landscape where our protagonists face increasing danger and have to rely on brute strength and courage. TS Bond understands this environment and it shows in the writing. There is a strong sense of reality about it, just as there is a touch of nightmare.
A sexualised story where our main characters are drawn and to some extent repelled from each other. Where actions now will have far reaching consequences. This is a hard drama, not an easy romance. The story is enlightened by flashbacks that slowly reveal how the lives of our heroes are intertwined.
A multi-layered science fiction romance with believable characters who tread a hard path. You should go read it.