Forever: The Companion by Bethany-Kris

Five years after their wedding, and life is good for Renzo and Lucia.
If not a little stressful.
They’re always on the move—Lucia with her gallery, and Renzo being an assassin for The League. At the chance to slow life down with a week-long trip for just the two of them to Bali, they can’t pass it up.
But even Bali will change things …
It’s one more step toward forever.