Beware the NeckRomancer by Lilo Quie

Life as a half giraffe mage, a hybrid on the fringes of society, has its positives and drawbacks. Greginald lives a simple life with his apothecary shop selling the odd herbal tea and spell for enhancements for certain kinds of men. Together with his whispering books and poltergeist that haunts the kitchen, he lives a fancifully dull life—until Esmeray comes along.
Esmeray is working his way up from the bottom in his father’s law firm to prove himself worthy of the Faust name. The only problem is a certain mage who has earned the ire of the church and society at large. Well, that and his sentient demon shadow. Defending the mage means defending his life as well. They’ll do anything to ruin Greginald.