In the novel "We Were the Mulvaneys" by Joyce Carol Oates, a poignant moment highlights a blend of affection and nostalgia. The phrase “Love you in that cheerleader's costume” reflects a personal sentiment tied to a specific memory. This line captures the intensity of feelings evoked by a seemingly simple observation of someone in a costume, signifying deeper emotional connections beyond the surface.

The mention of "Last Friday" and being unseen reveals themes of longing and the complexities of personal relationships. It suggests a hidden admiration or unreciprocated feelings, emphasizing how moments can be significant even when they go unnoticed. Overall, the passage encapsulates the bittersweet essence of love and the memories that linger in the background of everyday life.