The Battle Sylph, 1st in the Sylph series by L.J. McDonald, is one of B&N's Free Fridays book this week, courtesy of publisher Dorchester, who've been very generous with the freebies lately, presumably as part of their switch to all-digital publishing.
I'm not sure exactly what criteria paranormal romance requires, but it mostly seems to require some sort of Earth-based origin/crossover to go with the fantasy creatures, and this seems to be set on its own world, so I've also added the fantasy tag, even though for all I know this actually takes place in underground fight clubs in Minneapolis. The reviews are kind of ambiguous as to category.
Synopsis
Solie finds herself kidnapped as bait for a dangerous Battle Sylph named Heyou, but she fights back and takes control of him, an immensely powerful shapeshifter. Solie & Heyou flee death to seek sanctuary, and Heyou begins to fill Solie with desires that threaten to change the world.
For more paranormal romance reading, I think the B&N Samhain freebies from last week may still be active. Since those threads have been pushed back at least 3 pages by now, I'll check and add a round-up if that's the case after I'm done posting the other Free Fridays book.