The Missing Butterfly - Lovesongs, #1

Cassidy Monarch had dreams-to sing, to be famous, to tour the world at the head of his own rock band. Then his parents were killed in a tragic accident, leaving him to raise his two siblings. Determined to hold on to what remained of his family, Cassidy settled into an ordinary life, his dreams of fame reduced to occasional nights of singing at karaoke dives. But his careful, ordinary life began to fray with his new job, and the beautiful, charming boss who reminds him of all the things he tried to stop wanting.
Malcolm Osborne is a classic rags to riches story, a foster child who wound up with the perfect family and more money than he knows what to do with. He's wealthy, beautiful, successful, and completely miserable. Then he hires a new worker for his office, a young, hard-working man with a sadness in his eyes that Malcolm aches to banish, hoping that in doing so he will be rid of his own loneliness as well.