In the Dark by Megs Pritchard

Jax ‘Key’ Thorpe knew he had a stalker but was strangely unfazed by that knowledge. If anything, he found it reassuring until his stalker made a sudden appearance in his life.
Vampire Kelvin Standing watched his mate from afar. His human mate. The one vampire law stated he could never be with. When Key is attacked Kelvin jumps in to save him and changes both their lives.

With laws broken, and threats around every corner, can Key and Kelvin make their mating work, or will an enemy from the past destroy their chance of happiness?