The Wolf's Mate by Marie Medina
Hatori’s life changed forever when he discovered that his real father was a lycan, as his frequent illnesses suddenly made sense. After achieving his first shift into wolf form, he hoped the last remaining clan of lycans could offer him some relief after a lifetime of suffering.
Yet nothing goes as planned when he travels east to meet with this clan. Since his first full shift, Hatori’s sensitivity to—and craving for—vampire blood has been a great burden. Surrounded by very tempting vampires and confused by what the lycans have to tell him, Hatori doesn’t know what his next move should be. But when one of the vampires tastes Hatori’s blood, it becomes obvious the fates wanted Hatori to travel east for a very different reason.