Blood Chemistry by S.M. Campas is a gay paranormal romance about a newly turned vampire who created a substitute for blood and his human ex-boyfriend now tasked to protect him.

Blake Trujillo's life comes crashing down when an accident at the biochemistry lab results in him being bitten by a vampire. Fleeing home to seek help from his boyfriend, Lucas, he's shocked to discover that Lucas has been recruited to join a team of vampire hunters. Terrified of the idea that the love of his life will hate what he's becoming, Blake ends their relationship and runs before Lucas can learn the truth.

Five years later, Blake is the wildly successful founder of SanSynth, a pharmaceutical company dedicated to creating products to make vampires' lives easier. He's on the cusp of launching Fang Free, an artificial blood replacement that promises to change human-vampire relations forever by offering a viable option for rogues who have been resistant to animal blood. If Fang Free is successful, it will save countless vampire and human lives alike.

But when an assassination attempt against Blake threatens the launch, SanSynth's board votes to assign him a bodyguard until the culprit is found.

And that bodyguard is Lucas, decorated nestbreaker and furious ex. Blindsided by the fact that Blake never told him the truth of the day he left, he doesn't know how to reconcile the man he used to love with the vampire he's been hired to protect. Reunited, but not happy about it, Lucas and Blake must put aside old hurts and rekindled feelings to find out who wants Blake dead before the fragile peace between humans and vampires comes crumbling down around them.