Hearts On FIre by Shea Balik

The arsonist is still on the loose, and now their sight is set on Austin. Austin isn’t sure what he’s done to deserve someone trying to kill him. His only recourse is to hide and hope that the arsonist doesn’t hurt anyone else by trying to get to him. One of HFD’s finest, Mateo took one look at Austin and knew he’d met his future. Now he just has to keep him alive long enough to enjoy that future.