'After One Night With the Prince' definitely caught my eye. From what I've gathered, there isn't a direct sequel, but the author has written other books in the same universe that loosely tie into the themes. The story wraps up pretty neatly, so a sequel might not even be necessary—sometimes leaving things to the imagination is more satisfying. That said, if you loved the characters, you might enjoy diving into the author's other works, which often carry a similar vibe of drama and passion.
Personally, I found the standalone nature of the book refreshing. Too many series drag on past their prime, but this one knows when to quit while it's ahead. If you're craving more, checking out fan forums or the author's social media might uncover some hidden extras or spin-offs you'd enjoy.