Bright Side by Zenina Masters

The moment that the horn first appeared, Ystella hated it. She learned how to hide it from her family and the herd, but it involved time in the shop every few weeks. Grinding off a unicorn horn also made for some interesting side effects and taking care of the magical residue became a frenzied event.
With her family prodding her toward any available stallion, Ystella has to obey the rules, while completely avoiding them. Her technique has kept her from any entanglements, but her mother is catching on.

Magnus is a hunter sent to find the anomaly in the area. There is a mythical shifter where no mythical shifter should be and it is his job to identify it and bring it to the council; whether it wants to go or not.
New magic was dangerous and needed to be indexed, catalogued and identified. Magnus has never been so willing to throw himself into the path of danger. He has a hard side. He can take it.