Greatest Challenge by Catherine Lievens

The time to fight has come.

Apollo never minds his own business. What would be the fun in that? He’s the god of the sun, and people are usually happy to see him—but never Set. No, Set looks tempted to strangle Apollo every time they spend time together, and Apollo loves that.
Set doesn’t know what to make of Apollo. The sun god is annoying and clingy, no matter how hard Set tries to push him away. When Apollo decides to move in with the Egyptian pantheon—in Set’s suite of all places—Set has a hard time keeping him at arm’s length.
But no matter how hard Apollo tries to get into Set’s pants, the final fight looms on the horizon. Apophis is threatening to end the human realm and the Egyptian pantheon. Set, Ra, and their allies need to face their greatest challenge.

And risk everything to save themselves and humanity.