Diamond Universe: Sierra Walker Series by Casey Blair

Earth's magic was stolen. She's taking it back.All Sierra Walker has ever wanted is magic, but the powerful mage who trained her as a child betrayed her, sending her back from a world full of magic to modern-day Seattle. So when he comes to her a decade later, Sierra glimpses an opportunity:She steals his wand, and with it, she begins to steal back magic—for everyone... moreEarth's magic was stolen. She's taking it back.All Sierra Walker has ever wanted is magic, but the powerful mage who trained her as a child betrayed her, sending her back from a world full of magic to modern-day Seattle. So when he comes to her a decade later, Sierra glimpses an opportunity:She steals his wand, and with it, she begins to steal back magic—for everyone.In magical combat Sierra's a force to be reckoned with, but she's still on her own, her access to magic handicapped, with an entire world of mages now trying their best to kill her rather than share power. So when Nariel, a dangerous demon lord, offers his assistance, she can't say no. But she also knows better than to trust her life, and her magic, to anyone else ever again—no matter how he ignites a part of her she'd thought long lost.But as they race around the world to bring magic back while fighting for their lives, Sierra realizes there may now be two things she can't bear to lose.Diamond Universe: Sierra Walker is a fast-paced, action-packed urban romantasy series spanning the modern world and also other worlds full of magic, with a shadow-wielding demon boyfriend and a heroine who never quits no matter the odds and just goes harder as they fight to change the universe for everyone. Expect the heat level to escalate dramatically in each book. less

"They can't keep you."Sierra successfully brought magic back to the world, but it's left her with two big problems.First, now she needs to steal Nariel back from the exile the angels forced him into to save their worlds. But she's also in dire need of magic weapons, because the mages are doing everything in their power to take her magic and her life... more"They can't keep you."Sierra successfully brought magic back to the world, but it's left her with two big problems.First, now she needs to steal Nariel back from the exile the angels forced him into to save their worlds. But she's also in dire need of magic weapons, because the mages are doing everything in their power to take her magic and her life.Both of those needs take her to the world of demons, where Nariel has his own ideas for how Sierra can get her hands on enough power to protect both of their worlds.With mages coming after her with magic weapons of their own, Sierra needs every bit of magic she can wield. But she messed up before, and badly. So how can she trust herself to wield more power than any human ever has when failure would cost Nariel's life, too?Take Back Demons is the second book in Diamond Sierra Walker, a fast-paced, action-packed urban romantasy series spanning the modern world and also other worlds full of magic, with a shadow-wielding demon boyfriend and a heroine who never quits no matter the odds and just goes harder as they fight to change the universe for everyone. Expect the heat level to escalate dramatically in each book. less