"As long as you don't move, your brother-in-law is not wrong." The wife, neglected by her husband, unilaterally assumes a riding position. (From the novel "Rika Aimi DLDSS-555")

Married for five years, Rika's relationship with her husband was like that of good friends. Although she kept telling herself that she was happy, deep down, Rika harbored a deep loneliness as a woman. Then one day, her husband's older brother, Yuzuru, came to Tokyo on a business trip and stayed at their house. Although he was family, the presence of a man in the house made Rika's yearning heart and body unable to be suppressed any longer. One night, she quietly slipped into Yuzuru's bedroom, straddled her brother-in-law, and whispered, "Brother-in-law, please don't move... I'm the only one at fault," before beginning to move her hips against his body...