Mate Night (Silver Iris #5)

Every thirty to forty years a fertile buck is born to each of the three Capriethe tribes. Revered by their kind, these males, called Billietri, are the fathers of their people. After mating with each other, they release a chemical that increases their sex drive and allows them to impregnate dozens of does during an annual ritual -- Mate Night. Twenty-nine years ago, enemies of the Capriethe sought to destroy them by killing the next generation of Billietri. To avoid this, the young bucks -- Caesar, Alexander and Ramesses -- were separated and hidden in the far corners of the galaxy. Now the war is over and the Billietri must return home to mate for life and father the next generation of Capriethe. Caesar and Alexander long to fulfill their duty, but in spite of the trio's scorching passion for each other, Ramesses has other plans. His destined mates must convince him to take his rightful place among the Billietri before time runs out for their species.