Delving deep into the shame and taboo desires of a married woman, this story captures the emotional turmoil of fulfilling her husband's cuckolding fantasy. Eri (31), a pure and devoted wife determined to understand every part of her husband after three years of marriage—though they have no children—receives a request to be cuckolded from a man who organizes a swinging club. Hesitant at first, her body betrays her true feelings, and ultimately she submits to the man's cock, thinking, "If this makes my husband happy..." Confused by the rising pleasure, she rides him in the cowgirl position, chasing her own ecstasy. This scene vividly portrays the inner conflict and awakening desire within her.