Satan's Sword (Imp Series Book 2) by Debra Dunbar

Demon brothers are a PITA Especially when they make deals with other devils. I’ve got one simple task to do. Retrieve an artifact from the vampires, turn it over to some butt-wipe of a demon, and I’ll save my brother Dar from centuries of enslavement and torture. Easy peasy, even for an imp from Hel, right? What could go wrong? Everything, that’s what.

Ventura Hellway: An Imp World Urban Fantasy (California Demon) by Debra Dunbar

Beware the devils who promise miracles. When an old flame asks Eden to help find his younger brother, she initially refuses. Searching for Anton will put her smack in the middle of the Disciples—as well as on the radar of the demon who might own her soul. But a sense of obligation (plus the promised payout), overrides her instincts for self-preservation, and Eden takes the job. In the depths of a human underworld, Eden finds Anton and a whole lot more. Here the lawlessness of New Hell reigns. Organizers of cage fighting matches profit off human desperation, and a drug called Aries promises heaven but delivers hell. With the future of humanity at stake, Eden will need to face the dark origins of her magic, to embrace both who she was and what she’s becoming—all to save those who may not even be worth saving.