Claimed by my Step-Uncle

Viva Las Baby Bump. That's What I Get For Gambling My Heart Away In Sin City. Fiona:
They say that what happens in Vegas stays in Vegas, and I really hope that's true.
I'm here to celebrate my twenty-first birthday, and I plan to leave my virginity behind.
I don't have time for a relationship, and my middle name is trust issues.
My life has been a series of responsibilities since my mother abandoned my sister and me.
Now it's just the two of us.
That is, until the mysterious man I shared a magical night with tracks me down.
He's irresistible, and he's decided that I'm his.
I'm not sure how long I can resist him - he's relentless and very persuasive.
Letting him get close to me isn't an option, no matter how much I want to give in.
I'm terrified that he'll discover my secret.
That can't happen. It's a matter of life or death.
This book is a Mafia Romance with a forbidden age-gap relationship. The anti-hero is OTT and has a breeding k!nk for the v!rgin heroine.