Safe and Sound (Thornwood #4)
Caitlin Ricci

Oliver is a photographer, and getting guys and sex has always been easy for him. His current open relationship is no more friendship and fun than anything. But when Oliver meets Mason, he can see the younger man is fragile and desperately in need of help. Before anything can develop between them, Mason needs to free himself of his terrible living situation and start on the road to healing. Oliver wants to stand beside him as he does. What surprises him is the discovery that he might need Mason as much as Mason needs him.
This is the 4th book in the series but can be read as a standalone. The story ends in an HEA. This is a second edition and the word count has nearly doubled with new content.