When he returns home for the first time in seven years, his niece, Tsubomi, welcomes him. Tsubomi embraces him and gets shirtless, just as they always did. Feeling hot between his legs, the uncle begins to fondle her growing breasts. Seeing Tsubomi's repeated sensitive reactions, the uncle loses his mind and engages in forbidden sex. Feeling good, Tsubomi brings home her niece, who has bigger breasts than hers, for the sake of her uncle, who loves breasts...