The Windsors, book 2: The Temporary Wife
Catharina Maura

When Luca Windsor’s secretary suddenly quits her job shortly after his family forces him into an unwanted engagement, he sets out to solve both problems.
… by secretly marrying his secretary, Valentina, 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 one thing Valentina wants is the only thing he can never do : Letting her go.