Gunnar's Guardian (Protect and Serve #1)
Pandora Pine

Gunnar pushes all Kennedy’s buttons. He’s rude, cocky, and overconfident. He’s also sexy, and Kennedy can’t deny the attraction that simmers between them.
He helps Gunnar find a job at the local firehouse, where the younger man seems to fit in well. As they grow closer, tragedy strikes. Will Kennedy be able to save the man who’s become his whole life?
Gunnar’s Guardian is the first book in the Protect and Serve Series and features a sexy cop, his annoying neighbor, hot firefighters, and an arsonist on the loose.