Final answer:
To add tenderness and longing to the given passage, focus on the emotional state and actions of the characters in a way that evokes a sense of longing and yearning.
Step-by-step explanation:
In order to add tenderness and longing to the given passage, the writer can focus on the emotional state and actions of the characters in a way that evokes a sense of longing and yearning. For example, instead of simply stating that Eileen tidies up the area and leaves, the writer can describe Eileen's actions in a way that conveys her reluctance to leave, and her longing to stay in the company of the narrator. Additionally, the writer can use descriptive language to create a sense of tenderness, such as describing the way the characters' voices tremble with emotion or the way they exchange longing glances.