This is a strong, high-drama setup for a steamy fated-mates style romance. If you’d like help shaping it further, here are a few options depending on what you want to do next:
If you want a polished blurb version (tightened for a book description):
Victoria devoted five faithful years to Ethan, her destined mate—at least, that’s what she believed. On the night she’s finally ready to share her deepest secret, she walks in on Ethan and her best friend in bed, mocking her “omega innocence.”
Shattered and furious, Victoria walks away from the man who used her… and straight into the arms of his forbidden half-brother, Damian Sterling—dangerous, magnetic, and everything she should avoid.
“Why me?” Damian’s voice is all shadows and steel.
“Because I want to forget your brother,” she answers.
One night. No feelings. No regrets.
But fate has other plans.
Because Victoria was never an omega.
Damian was never meant to touch her.
And the bond that ignites between them will rewrite every rule they thought they knew.
When buried secrets explode and loyalties are torn apart, one question remains:
Will a night born of revenge turn into something deeper… or destroy them both?
If you tell me your target heat level (closed door / steamy / explicit) and your preferred trope mix (e.g., fated mates, rejected mate, brother’s rival, secret identity), I can help you:
turn this into a full back-cover blurb,
outline the novel (acts, key beats, major twists),
or refine the hook and tagline for marketing.