As they spend more time together, Luke and Leia begin to develop a closer bond. They learn that they have a lot in common, including their love for adventure and their desire to fight back against the Empire. They also begin to develop romantic feelings for each other, but they are both hesitant to act on them due to their relationship as siblings.
In the end, Luke and Leia never become romantically involved. However, they do become very close friends and allies, and they fight side by side for many years.