Sumika, a married woman in her prime, had grown close to her daughter's boyfriend, maintaining a warm, family-like relationship. However, the young man's intense sexual desire led to frequent sex in her daughter's room, the sounds of which reached Sumika and her husband's bedroom. Her husband merely remarked, "He's really going at it," impressed by the boy's stamina. One day, returning home from shopping, Sumika noticed her daughter was absent and discovered the boyfriend masturbating. Flustered, she tried to leave, but he confessed, "I'm overwhelmed with desire—I don't know what to do." Trying to calm him, Sumika said, "It's normal for young men to have strong urges," but his lust only intensified. Before she knew it, he was on her, relentless and impassioned. As she weakly resisted, Sumika's legs began to tremble uncontrollably, her body overcome with pleasure until she could no longer stand.