"It" started with the younger sister's first period. For 10 years, the older brother, who had become a recluse, has been sucking on his younger sister's breasts like a baby, squeezing her G-cup breasts and twisting her developing sensitive nipples. Midsummer breastfeeding handjobs. Breastfeeding play. Farewell sex. Christmas breastfeeding sex... A slightly strange AV that realistically depicts the "abnormal daily life" of one family.