Rooted (Pagano Family #3)
Susan Fanetti

When Rosa graduates from college, Carmen takes her to Europe for the summer. She means the trip as not simply a gift, but a way to strengthen their bond as sisters and to help Rosa, the youngest sibling and the pampered family princess, become a more fully-realized adult. She has no intention of spending time with anyone but her sister.
Writer and widower Theo Wilde is living in Paris for several months, with the mission to write his next book. His grown sons, worried that he is too much alone, push him into the city to meet someone new. He’s not enthusiastic, but he makes a promise to try. It’s Carmen he meets.
What begins as a summer fling against the beautiful, romantic backdrop of Paris becomes something that neither of them expected, something Carmen is not prepared for. She has always placed her family first, but to be with Theo, she’ll need to stretch beyond her roots and grow.
Note: explicit sex, some violence.