Omega for the Pack — N.J. Lysk

When Ray presents as an omega instead of an alpha, his life changes forever. As a male omega, he's expected to mate with a select group of alphas and start a pack of his own. 

The five men selected for him are as different as they are keen. And one of them is his best friend, Josh, who Ray was sure could never return his feelings. But now they all must deal with the mating instinct that the power of the Moon brings out in them; and after that... Ray will have bigger problems than a crush.