Vixen: A Steamy Reverse Harem Biker Romance (Claimed by Outlaws #2):

I never thought I'd meet a Renegade, let alone fall for all four. And I'll do anything to keep them. We had one task: escape into the wilderness and live out the rest of our days happy and randy...or something like that. But when the man who was supposed to get us out of town turns up dead, we realize a more sinister enemy intends to keep us close by. And while it's their friend on the floor, it's my nickname on the wall in his blood. I probably should have told them my ex was an assassin. ...