I'm trying to find this short read

For nine years, Catherine has hidden her true identity as a vampire to live as the Alpha’s Luna in Nathaniel’s werewolf pack. Suppressing her innate bloodlust and relying on her grandmother’s ancient vampire bracelet to keep her secret safe, she has built a quiet, gilded cage of a life as Nathaniel’s wife—until the night he brings his pregnant mistress Isabelle to their door. Nathaniel demands Catherine surrender her bedroom, her title, and her sacred Moonvow Bracelet to the new would-be Luna. Nine years of forced obedience and repression shatters the moment the bracelet leaves Catherine’s wrist. The magic does not just reveal Catherine’s long-concealed fangs—it burns every one of Isabelle’s dark, deadly lies into the open, leaving a betrayed, ravenous vampire ready to settle old scores.