Short summary of the story "On a Stone Pillow" in the book, First Person Singular.

In “On a Stone Pillow,” an unnamed narrator recalls spending the night with a woman he worked with when he was a sophomore in college. They barely knew one another, and the woman told the narrator she might call out another man's name during sex. She explained that she was in love with the other man, but he did not love her back. The narrator wondered why she maintained a sexual relationship with this man who was clearly using her. In the morning, she mentioned she wrote a book of tanka poems and told the narrator she would send him a copy. She did, and he found the poems fascinating. In the present, he wonders why he continues to think of this woman and her poems so long after this incident occurred.