Xtreme Affair by Em Petrova

A scarred special operative meets his match with the woman determined to save him from himself.
It was just a little accident—but it changed his life.
Special Xtreme Ops team, River Hepburn wakes in the hospital to the sight of Sacha—his best friend’s little sister—watching over him. Their emotional bond over her brother’s death is undeniable, but he isn’t prepared to feel more. All he wants to do is return to the line of duty.
Accident and injuries are words Sascha Lacey understands, but the name connected with them take her by surprise. Agreeing to nurse River’s injuries is the easy part—dealing with his brand of stubbornness is far from it. Nor is she prepared for his fiery kisses—or the emotions that blossom from the heat. Except River is different…a changed man from the boy who left a small town in Texas.
Guilt and ghosts of the past can’t stop River’s raw urges when it comes to keeping his hands off Sascha, but what are a few scorching nights of passion? Sascha may find his stubborn streak irritating, but can she trust the changed man with her heart?