Unicorn of Glass by Zoe Chant

Christmas magic…in July?
Heather’s life is not entirely normal. She dresses as a holiday elf for one job and a medieval peasant for the other. She has an Italian Greyhound that fits in her purse. But now there’s a beautiful, buck-naked man standing in her apartment explaining that he’s a unicorn who was trapped in a glass Christmas ornament. And things are just about to get a whole lot weirder.
Rez, fae unicorn knight and defender of the broken crown, isn’t sure how he got to this magic-starved world or why the beauty who freed him from his glass prison has cast an enchantment on him. He only knows he has to find his shieldmates and return to his fight with the darkness before he loses himself to her charms (and those of her tiny hound) forever.
Dark forces from his fallen world are tracking them down. But Rez has much harder tasks at hand: battling a rogue vacuum cleaner, braving buses and BigMart, defending a hound’s honor at a Ren Faire…and facing dinner with Heather’s mother.
Heather and Rez will have to work together with old allies and new to find answers, discover the key to his magic, and unlock the power of his unicorn heart…before his enemies find a way to stop them forever.