Sins in Sunlight by Rachel Hailey

The Sunfire Queen, Sierra, has waited for her chance to rule, thinking life would be better with her mother dead. She was wrong. The Court of Light is in Shambles. Her people are terrified and despise her. She has no friends, no love, and no hope. When a new war hovers on the horizon, Sierra must find the lost beastkyn Mikhail or her court will perish, and she’ll lose her shot at redemption.
Quick to grin and quicker to kill, Mikhail has made his share of mistakes–being imprisoned has given him time to ponder each poor decision. But when Sierra frees him, he earns the opportunity to make some more. She’s gorgeous and despite her fiery nature, as cold as the snow-capped mountains of Russia. He can’t wait to see how fast he can make her melt.