Recently, my stepson, Wataru, has been acting strange. He takes my underwear while I'm in the bath, and suddenly tries to hug me... Wataru sees me as a woman, not a mother. Maybe it was the stress of the university entrance exams, but I was also sexually frustrated, so we started a relationship that I couldn't tell my husband about. Now, even when my husband is nearby, I enjoy sex while suppressing my voice.