OtherKin, book 1 : Fury
Anya Bast2011

Nikki is a cougar shifter living in a werewolf world. When she's promised as a mate to a wolf shifter named Merrick, the fur flies. Cats are solitary and proud. No way will she be tamed, not even if Merrick’s touch drives her insane with need.

But Merrick has wanted Nikki for a long time and there's no way he’s letting her go. He’ll use every dark and erotic trick he knows to seduce her body...and then win her heart.