Addicted to You by Kimberly Knight

Cash Hawthorne helps people stay sober, not fall for them. That changes when he’s hired by Silas Hale, his girlfriend’s wild and unpredictable rockstar brother, fresh out of rehab.
For years, Silas lived for his band, drugs, and women. He’s ignored every warning, refusing to give up his partying ways until the night he almost doesn’t wake up. Determined to stay on track on tour, he hires Cash to be his sober companion.
Neither of them has ever considered being with a man, but living together twenty-four seven makes it impossible to ignore their attraction, and one night, a line is crossed.
A kiss turns into something more, and once they get a taste, they can’t stop.
Cash knows getting involved with Silas is a mistake. He’s supposed to help him, not crave him. And Silas is trying to prove he has his life under control, not unravel under Cash’s touch. But no matter how many times they agree it can’t happen again, they keep coming back for more.
When Cash’s contract with Silas ends, so should their time together. Silas continues touring with Surrender, while Cash is left wondering what comes next.
They both know they should move on. They know they should forget what happened between them behind closed doors.
But some addictions are harder to overcome than others.