Protect Me by Rain Carrington

Convicted for a crime he didn’t commit; Brett Lincoln leaves his friends behind and heads to prison. Scared but wary, he takes each moment to assess the dangers that seem to be lurking around every corner.
From the first day, he was stalked and taunted by the bulls, a group of rapists out to make him their next victim. Brian Lauder works in the same prison, and tries to help, but when word gets out about Brett’s former lifestyle and membership in the leather and fetish club, Chaps, and that Brian is a member there as well, Brian’s help makes things worse.

Spencer, a former prison guard and current security at Chaps, is recruited by Brian to take a job at the prison and keep an extra set of eyes on Brett. What they all learn about the inner workings of the place terrify them more for the young man.
A mysterious black car pulls up to Spencer in the prison parking lot, and then waits at Brian’s home. They soon discover that not only is Brett’s life on the line, but their own, if they allow anything to happen to him.
Callahan O’Malley is a huge man of few words. He’s given a wide berth on the block, and no one can tell Brett why. When Brett is almost raped, he comes out of the infirmary terrified and when he sees that the bulls aren’t finished with him, he runs to Callahan and begs him, “Protect me!”

What starts as protection turns into something else. Callahan forces him to eat, to work out and teaches him to defend himself. Brett gets feelings for him, but Callahan won’t allow it. Then, the unthinkable happens, and Brett must again face the prison alone. Now, though, he has the skills and the pain behind them to protect himself.
Once he gets out, he realizes the fight isn’t over as he must face the world, which seems as ruthless as the prison ever did.
Come Back to Denver, and find that not all bound men are willing, and not all prisons have walls.
Trigger warning: Contains scenes of non-com, attempted rape and violence.