Mine to Hold by Megs Pritchard

Euan McLeod had served his time in the military and had found a new band of brothers in his colleagues at Rescue Inc. His days were full and rewarding, helping those in need but all that changed and the stakes had been raised. Now, he and his brothers were involved in something so much bigger than themselves: rescuing the blood slaves and bringing down the Vampire Council.
Hours of planning, stakeouts and sifting through endless reams data had led them to this point. Failure was not an option, their lives and that of the American people… maybe even the world depended on the success of their mission. Everyone else was going about their lives in blissful ignorance, not knowing that an evil King was plotting their demise.
It was one night on a stakeout, as he watched a location they believed to be holding humans as slaves, that he met the vampire who would change his future.
Logan Cox had lost so much at the hands of the council. Almost all his family were now gone, except him and his brother, the only survivors of a massacre. He knew the instant he met Euan that he was staring into the eyes of his future, but he didn’t know how to react.
Finding his mate in the midst of all this was terrible timing, and after surviving alone with his brother from the age of twelve, he’d had little exposure to life. The only thing he wanted to focus on right now was to bringing down the council and avenging the death of his family.
Now they had to work together to bring the council’s reign to an end and usher in a new future, but would they survive, or would they die trying?