Forbidden Omega by Jena Wade

Louie knew Connor was different from the beginning. As a member of the harem, the whole family has access to Connor, but Louie staked his claim early on so none of the alphas would ever go near him. And since he’s developed a close friendship with Joey, Connor is even more isolated from the rest of the in-house omegas than ever.
But that’s okay because he’s quickly falling for Louie. Everything is great until their precautions aren’t enough, and Connor gets pregnant. He trusts Louie to do the right thing, but the family is in charge of who brings in heirs, and there’s a good chance they wouldn’t allow Connor to have the baby he already loves so much.
Which leaves him with only one option.
Run.