Halfway to the Grave by Jeaniene Frost

Cat and Bones's first meeting was s*** it was hilarious:

                 "Want to eff?" 

                  The words burst out, and I was horrified at myself for saying them. I barely managed to avoid clapping a hand over my mouth, never having used that word before. He glanced back with a curl of amusement on his lips, having turned away after his second refusal. Dark eyes raked me appraisingly. 

                "Bad timing, luv. Have to wait until later. Be a good bird and fly away, I'll find you." 

Bones that man is blunt, "dark eyebrows rose. "No problem, pet. Have we stopped here for good? Is this where you want to shag?" I mean the man has no filter, "you weren't going to shag me with all your clothes on, were you, Kitten?" he taunted. "Guess all you'll need off is your knickers, then. Come on. Don't take all bloody night." He's I loved him, "sixteen? he repeated in disbelief, looking me over thoroughly again. "Sixteen vampires you took out yourself with noting but a stake and your cleavage? Makes me shamed of my kind, it does." And he can be sweet, "consider it your night off. You will be Cat and I will be Crispin, and you' send me home with a dry mouth and aching balls just like you would if we'd never met before." And he doesn't like other men trying to get what's his, "I can only say that it was caused by my natural affront to the notion of her as my sister. Since I'll be shagging her tonight, you can imagine how I'd be distressed at the thought of rogering my sibling."