Mother Yuka knew that her son Kousuke had been switched at birth, but she had kept this secret hidden for years. However, one day she finally reveals the truth to him. Realizing they are not biologically related, Kousuke gives in to feelings he had long suppressed and passionately desires her. Acknowledging their mutual emotions, they intensely kiss, tongues entwining, and cross the line into forbidden intimacy. Driven by desire, Yuka craves his cock and begs repeatedly for creampie after creampie. Responding to her hunger, Kousuke fiercely penetrates her, determined to impregnate her. Their relationship deepens as emotion and lust become inextricably intertwined.