Forged in Fire by Catherine Lievens

Journalist Caleb has had trust issues with dragons ever since his best friend was abused by one. He prefers working alone, especially when tracking the arsonist targeting shifter businesses around town. The human population doesn't know about the paranormal world, and Caleb intends to keep it that way.

He's not sure the arsonist does.

Austin knew he and Caleb would cross paths eventually since their best friends are dating, but he didn't expect it to happen at the scene of a fire, especially not when they both suspect it was arson. Austin offers Caleb his help, but Caleb rejects it.

As the fires escalate and the arsonist grows bolder, Caleb finally accepts Austin as his partner. Working together sparks something neither of them expected, but will they have time to explore it, or will the arsonist reach one of them first?