It's been only two years since their remarriage. While her husband is away on a solo assignment, Yukari is taking care of her stepson. Unable to satisfy her sexual desires with her husband, she one day catches her stepson having an erection while napping. Unable to resist the sight of his impressive cock, bigger than her husband's, she gives in to temptation and starts sucking on it, crossing the line. Desperate for a child, Yukari even begs her stepson to impregnate her in her husband's place...