The Unlikeable Demon Hunter Collection: Books 1-3. Nava Katz

The mission: kill demons. The distraction: one hot-as-hell slayer. Welcome to urban fantasy's funniest, spiciest, demon-hunting trial by fire. Nava Katz is an expert at lowering expectations. She's cynical, aimless, and perfectly content to let her twin brother, Ari, be the family's golden boy. He's the one who trained his whole life to join the Brotherhood. He's also the one the magical induction ring was supposed to choose.
But when Nava crashes the ceremony, the ring doesn't fit Ari. It snaps onto her finger. It's her worst nightmare: a purpose. Stuck with powers she doesn't want or know how to use, and a Brotherhood that's just waiting for her to fail, Nava needs a crash course in survival. Unfortunately, her teacher is Rohan Mitra-an ex-rock god turned slayer whose inner demons earn nods of respect from actual ones.
He's dangerous, tempting, and the best bad decision ever. Now she must master her magic and survive the demons hunting her long enough to stay alive. The Brotherhood wants her gone. The demons want her dead. She's already nailing it. Love Charley Davidson's snark and Night Huntress's heat? You'll devour The Unlikeable Demon Hunter with its laugh-out-loud banter, spicy romance, and a heroine who's learning to own her power.
Includes the titles:The Unlikeable Demon HunterThe Unlikeable Demon Hunter: StingThe Unlikeable Demon Hunter: NeedBinge it now.