Reckless Vow by Maxine Henri

Convenient and temporary. That’s all our marriage is.

My grandmother’s inheritance is a problem. A problem to be solved with a marriage.
And there is no handier fake husband for me than my stepbrother, Baldo Cassinetti.
Our family endorses the make-believe match wholeheartedly.
But they don’t know we have a history.
Secret, forbidden history that should stay in the past.

Baldo isn’t the boy I once knew.
A powerful billionaire, he’s more poised, more infuriating, more gorgeous. More everything.
He seems to have no problem forgetting the past. I’m his sister, after all.
Until he first calls me his wife and I know our reckless vows will hurt the family.
Or destroy us.

Reckless Vow is a part of the Reckless Billionaires series, but can be read as a standalone.