The D.E.V.I.N. Series Books 1-3 by Katina Gavin
Beginnings - Angel has just one assignment left, and when the investigation of a double homicide leads him to Lindsey's door, he knows that she's the one. One Step Closer - Joe Running Deer has spent the last thirteen years in the SEALs and loved every minute. He has also loved Sydney Wheeler for almost as long. He’s decided to give her what she wants but when he returns from his last mission, she’s gone. When Love Takes Over - A virtuous, heartbroken marine. A romance-hungry virgin. Do they have to pick and choose between love… and lust?