The Temporary Wife (The Windsors #2) by Catharina Maura

From the author of The Wrong Bride and Forever After All comes an angsty and steamy marriage of convenience romance featuring a billionaire boss and his secretary.

When Luca Windsor’s secretary quits her job shortly after he’s forced into an unwanted engagement arranged by his family, he sets out to solve both problems.

… by secretly marrying his secretary instead.

The rules are simple:

1. Don’t fall in love
2. Keep their marriage a secret at work
3. Share a bed every night

It was meant to be a straightforward and mutually beneficial deal, but with each day that passes, it becomes clearer to Luca that the only thing Valentina wants is the one thing he can never do.

Letting her go.