Opposite to her innocent and pure appearance, the real truth is that the niece "Mari" is a masochistic, secretly perverted girl. When first touched by her uncle, she feels both embarrassment and confusion, yet her excitement steadily grows. Her sensitive pussy reacts intensely to her uncle's caresses, quivering and reaching orgasm repeatedly. Though initially frightened, she now lustfully begs for his cock with a lewd expression. This release captures thrilling moments of her transformation.