Grandmother Kousha, who always spoils her grandson Shunsuke. Seeing his parents' strict upbringing, she gives him pocket money or cleans his room, willing to do anything for her adorable grandson. One day, as usual, while cleaning Shunsuke's room, Kousha notices Shunsuke excitedly pressing his crotch against her cleavage. Deciding to shed a layer of clothing for Shunsuke, who has no experience with women…
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