Hunter’s Curse (Eryn & Larcen #1; Delta Underground Operatives)

Their bloodlines make them mortal enemies.
He dwells underground. She thrives in the sky.

But together Eryn and Larcen become a nearly unstoppable powerhouse.

They must join together as assassins with the Delta Underground Operatives to take on a supernatural villain no one else can stop...

Larcen:
When I left my home caves, I expected to be given the very best partner DUO had to offer.

I’m a drow prince, after all—the very definition of assassin material—and they stick me with a damn air elemental.

What’s she gonna do? Wave her pretty bladed fans and smile our enemies to death?

They want me to take down a shadow mage bent on ripping the veil between the magical and mundane worlds apart with that?

Are they serious? Yeah, hard pass.

Eryn:
When you're over three hundred years old, career changes are hard. Like, slap you in the face with a chair kinda hard.

But we air elementals are flexible, mist made flesh with a bubbly personality to match.

From guardian to assassin? No problem! That is, until I'm forced to ally with a cave-dwelling, cobweb-munching, mildew-encrusted drow.

If I wasn’t hardwired to protect the innocent, I’d let this shadow mage summon the Wild Hunt and go on a murderous rampage to overthrow the humans in a heartbeat.

And this arrogant drow thinks I don’t have what it takes because I’m too nice? Oh honey, do you think I wear these bladed fans just for show?

He’s grumpy. She’s pure sunshine.
The world is on the brink of chaos… and they're expected to save it.

Preferably before they kill each other.