Harmless Revenge by Melissa Schroeder

This book was originally titled A Little Harmless Revenge.

He thinks he’s on his own.
Sean Kaheaku always been a man on top of his game. And that game is international espionage. Not on the bad end of it. He’s one of the good guys. Or he had been until about six months ago. His whole world got turned upside down and he’s still trying to figure out what to do about it. So, he went home to Hawaii, and that’s exactly where he is, trying to figure out what to do now that he’s been burned as a security agent.

They refuse to let him self-destruct.
But when two of his old lovers arrive in Honolulu, Jaime Alexander and Randy Young won’t leave him alone. He refuses their help and they ignore him. As they spend time together, old feelings float to the surface, and the twosome becomes a threesome. Their nights together are hotter than even the Hawaiian sun. It’s exciting and overwhelming at the same time, and it starts to feel as if this could be something special.