Deathless by L Eveland

The Pantheon gave me a reason to kill. He gave me a reason to live.

JASPER
Once, I was the youngest Director in Pantheon history. I knew exactly who I was and what I was worth. Then I walked away with one secret and I’ve been burning the evidence ever since.
Diego Reyes was supposed to be temporary, just a warm body on a cold night in Brussels. Instead, he’s become the best mistake I’ve ever made. And the riskiest.
Now Achilles — the son Zeus always passed over for me — is coming to take everything Diego and I have built. And I’m about to show the Pantheon exactly what I do when someone threatens what’s mine.

DIEGO
I come from people who bleed for each other. Who bury their dead, feed their enemies at the same table, and hold the line when it costs everything. I know exactly what family is.
Then I met Jasper. Took me about five minutes to decide he was mine.
I’m Romani. I know exactly what men like Jasper have cost my people.
And I could lose everything fighting someone else’s war.
But it’s too late to back out now. The Pantheon wants a war. I’ve got two families, a Russian with a katana, and absolutely nothing left to lose.