His Reluctant Tiger. The Year of Eyes, #1

Shigure finally has a home and friends who love him, and even a brother he's slowly building a relationship with after years of estrangement. He thinks his life is settling down, and then he discovers he's a vampire's mate. His focus changes completely when he offers his mentor's brother, Kyros, his blood and feels their connection. Loving others has always ended badly for Shigure, so he's afraid to believe the fates are truly blessing him with so many good things all at once.
Kyros wants to curse himself for not seeing that his mate was right under his nose for almost a year. But now that he's found him, he's going to do everything he can to show the timid and reluctant young man how beautiful every aspect of love can be. Just as Shigure starts to open up emotionally and yield physically, a summons from the king separates them. Now they have to trust that the gods didn't give them a brief glimpse of happiness only to separate them forever.