It had been over half a year since she had been a wife. Eri's dissatisfaction had reached its limit. Next to her sleeping husband, Eri was pleasuring herself in loneliness, as if to spite him. Suddenly, her stepson sneaks in quietly. "I'll comfort you in place of my old man," he says. Such a lewd relationship between parent and child is not allowed. Eri, anxious about when her sleeping husband might wake up, desperately resists... but with his sweet whispers and rough yet strong caresses, doubt begins to form in Eri's heart...