Credence by Zoey Ellis

Beta Commander Torin never expected his life of order to be turned upside down by a woman!

And not just any woman, but an Omega - a dynamic he could never truly have. But as he gets closer to her, she brings out something in him that he can't control - something possessive and rough, unlike anything he's felt before...

He's determined to find out the secrets she holds, in the hopes they will satisfy his curiosity about her. But, he may just get more than he bargained for...

Must be read after Books 1-3 in the Myth of Omega series.