The Thulukan Chronicles (Books 1&2) by Maer Wilson [epub,mobi]

1. Relics
Most of Thulu and La Fi's clients are dead. Which is perfect since their detective agency caters to the supernatural. So, a job finding relics for an ancient daemon should be simple.
The daemon needs the relics to keep a dangerous portal closed. His enemy, Gabriel, wants the relics to open the portal and give his people access to a new feeding ground - Earth.
Stunning humanity with their existence, portals to other worlds begin to open and the creatures of magic return to Earth.
When Gabriel threatens their family, Thulu and La Fi's search becomes personal. The couple will need powerful allies in the race to find the relics before Gabriel does. But maybe that's what grateful dead, magical allies and daemonic clients are for.
When the creatures of myth and magic return to Earth, they're nothing like your mother's fairy tales.

2. Portals
For supernatural detectives Thulu and La Fi, “normal” is a relative term. La Fi is a medium, Thulu is a finder, and their usual clients are already dead.
But when their friend Reo is shot, and a group of stranded angels show up at their house for help to find a missing child, things are striking too close to home.
And now the portals that let the magical races return to Earth have started opening on their own.
With trips off-world, a kidnapped psychic and changes to their own abilities, Thulu and La Fi are hit with a lot more than they usually handle. Of course, their magical friends are there to help, but even they may not be enough to save an increasingly unstable Earth.