The Lunatics by Navessa Allen

Layla Fitzpatrick lives a simple life, for a werewolf. And that's just how she likes it. Her childhood was less than ideal. She'd like to spend her adult years flying under the radar of more powerful preternatural creatures. Because she knows from experience what happens when they notice you. Everything changes one early summer night when she attends a ritual bonding ceremony meant to join two werewolves together for life. Midway through, the spell becomes corrupted and she finds herself unexpectedly mated to the stuffiest shifter she's ever laid eyes on.

Michael Kolbeck is more man than wolf. He spends his days in a skyscraper, building his family's empire. At night, he prowls the streets of Boston, a city where shifters, witches, and vampires walk a delicate tightrope of ceasefire masquerading as peace. Little do they know that Layla's arrival will act as the spark that ignites the fire, and that thin veneer of peace is about to vanish.