MM - Spectr series by Jordan L. Hawk [epub]

Hunter of Demons #1:

Unregistered paranormal Caleb Jansen only wants a normal life. But when a demon murders his brother, Caleb knows he has to avenge Ben’s death, no matter what the cost. Unfortunately, his only allies belong to an extremist group who would kill Caleb if they found out about his talent.
Gray is a wandering spirit, summoned to hunt and destroy demons by drinking their blood. This hunt goes horribly wrong, and for the first time in his existence Gray is trapped in a living, human body. Caleb’s body…and Caleb is still in it.
Hotshot federal agent John Starkweather thinks he’s seen it all. But when he’s called to exorcise Caleb, he finds a creature which isn’t supposed to exist outside of stories. For Gray is a drakul: a vampire.
Having spent his life avoiding the government as an unregistered ‘mal, Caleb can’t let himself trust a federal exorcist, no matter how sexy. And he certainly isn’t going to give into the heat growing between them and sleep with Starkweather.
Can Starkweather win Caleb’s trust and convince him he isn’t the enemy? Can Caleb keep Gray under control, as the drakul experiences the temptation of a living body for the first time?
Because if he fails and Gray gives in to bloodlust, Starkweather will have no choice but to kill them both.

Master of Ghouls #2:

Caleb Jansen’s old life is in ruins after being possessed by the vampire spirit Gray. Now all Caleb wants is for Gray to be exorcised so he can adjust to living as a registered paranormal. Instead, District Chief Kaniyar of SPECTR offers him a new choice: be locked away for public safety, or come work for the very agency he’s spent years trying to avoid. The only good thing to come from Caleb’s possession is his relationship with federal exorcist John Starkweather, but even that seems doomed to end before it can really begin.
John’s newest case is a nightmare: someone is summoning demons and forcing them to possess women and boys snatched from the streets of Charleston. If his team can’t find the summoner soon enough, the possessions will become permanent, transforming the victims into ghouls. To make matters worse, he barely prevents Gray from feeding on their only lead.
Can John shield his heart from Caleb, who only seems interested in a temporary hook-up? Can Caleb keep Gray under control while they hunt for the summoner? Or will the cost of solving the case be higher than any of them could have guessed?
Because the master of ghouls has set his sights on a new target: Gray.

Reaper of Souls #3:

When an incubus murders the powerful ally of an anti-paranormal senator, it’s up to hotshot Federal agent John Starkweather to catch the demon before it can kill again. Fortunately, he has backup, in the form of his boyfriend Caleb, a telekinetic possessed by the vampire spirit Gray.
As the political pressure mounts and bodies pile up, John discovers an old enemy protecting the incubus: the Fist of God, a group that believes all paranormals are evil. But why would the Fist work with a demon? And why would they let it kill one of their own allies?
John and Caleb need to find out fast. Because the incubus lurks at the intersection of love and longing, and it’s willing to turn their deepest desires against them.

Eater of Lives #4:

When a supernatural killer is implicated in a string of cannibalistic murders, federal exorcist John Starkweather must track the demon down with the help of his live-in lover, Caleb Jansen. Caleb is possessed by Gray, a vampire spirit who is a natural demon hunter.
Caleb’s desire to find the killer is tempered by the knowledge his own time is running out. If John can’t successfully figure out how to exorcise Gray before forty days are up, the possession becomes permanent.
When John’s ex shows up, looking for a place to stay while visiting the city on business, tensions mount even higher. Lines are drawn, and Caleb learns that some decisions, once made, can never be changed.

Destroyer of Worlds #5:

After becoming possessed by the vampire spirit Gray, telekineticCaleb Jansen thought his situation couldn’t get any worse. But that was before Graham Forsyth, head of SPECTR’s sinister Research Division, took him into custody.
Forsyth claims he can exorcise Gray before the forty-day time limit runs out. But once at RD, Caleb and Gray find themselves ensnared in a web of lies. What is the truth behind the tests Forsyth is performing on them? What does the agency really plan to do with Gray? And most worrisome of all, why does Gray sense demons within the walls of RD’s compound?
Caleb’s boyfriend, SPECTR agent John Starkweather, has suspicions of his own. With the help of his friend Sean and a shadowy organization known only by their symbol of a moth, John intends to save Caleb and Gray at any cost.
But when divided loyalties threaten his last chance at exorcism, Caleb discovers love may come at a price higher than he’d ever imagined.

Summoner of Storms #6:

Federal exorcist John Starkweather’s life is in tatters. His best friend Sean betrayed him. SPECTR, the agency he viewed more as a surrogate family than an employer, wants him dead. His only allies are members of the mysterious organization called the Vigilant, whose motives remain in question.
The only thing keeping John together is the presence of his lovers: Caleb Jansen, a powerful telekinetic, and Gray, the vampire spirit possessing Caleb.
Together, they must not only evade capture, but somehow stop SPECTR from building an army of demon possessed soldiers. If they are to succeed, John must question everything he’s ever believed about SPECTR and spirits. And Caleb and Gray must decide how far they’re willing to go—not just for John’s love, but for his very life.