The Gremlin Prince by Heather Young-Nichols

Alyssum Bracken will do anything to find the Gremlin Prince…
After a longtime feud over copper between the Gremalian and the Gobel races, her people’s only hope for survival lies with Jensen Burkhardt and the hope he inherited his father’s abilities. When she tracks him down, Alyssum discovers she isn’t the first to get there. Aric, a rival goblin, is already ensconced in Jensen’s life.
Risking exile to save both races from a bloody war, the unlikely trio come together to fight for everything they love. A forbidden friendship with Aric, a first love with Jensen, while juggling the leader of her people, who’s also her father, prejudice against the Gobel—and Aric’s people trying to kill them all—could be too much for Alyssum to handle.Jensen’s strength is the one thing keeping Alyssum grounded, but will their relationship be jeopardized by her friendship with Aric? Will any of them survive?
Alyssum isn’t sure… but she’s going to fight like hell.