His Brother’s Dowry by N.J. Lysk

Tony has always admired his older brother Peter. Enough that when Peter decides to leave their birth pack to try his luck in a new one, Tony follows him there. As a beta, life will not be easy for Tony in the new pack—there, he’s expected to submit to the attentions of any unmated alphas since the pack does not have enough omegas yet. But he loves his alpha brother enough to endure the discomfort so Peter can get access to the new pack’s other betas.
Except Peter is in love with an omega already and the price of her dowry is well beyond anything he can afford. The girl’s brothers demand an omega of their very own.