The Glass Coffin - Dance with the Devil, #1.5

Rostislav is a witch of impressive enough skill he is known as the Cursebreaker-and has gained further notoriety by being the best friend of the infamous Johnnie Desrosiers. But even his power and connections would not be enough to save him from the ridicule and rejection he would face if his deepest secret came to light: that he is a human pathetic enough to be in love with a vampire. When he is hired by a museum to examine a cursed artifact-the glass coffin from a notorious, and false, legend about a vampire who fell in love with a human-it's one more bitter reminder about how impossible his deepest desire really is.