The Witch's Complement - The Cloaked Series, #3

Life has taught Abby to keep her magic under wraps, especially at work where she's an apprentice to Seattle's hottest new tattoo artist. But meeting her mentor's friend-a gorgeous witch named Wren-rips Abby's intentions to hell when Wren's magic sparks to life more than Abby's attraction. Wren has never shared a connection so strong with another witch and she isn't sure she wants to. Her last relationship ended with a funeral, but Abby's energy is impossible to resist and soon Wren isn't sure what she wants more-her old life back, or a future with Abby.  When Abby's mentor's girlfriend walks into the shop dripping with dark magic, Abby enlists Wren's help to find the source.
Whoever is behind the dark energy only needs a couple of unwilling mediums to unleash pure evil onto the world-and it turns out Wren knows just the two mediums they're looking for.