One summer day, a son bought his mother ice cream. The two of them eat the ice cream together, but the mother, who has been feeling a bit sexually frustrated lately, sees her son's tongue as he licks the ice cream and fantasizes about entwining her tongue with her son's and kissing him for a long, long time... The mother's heart is excited by the obscene fantasies she has with her son and she masturbates alone... The son, who saw his mother's lewd appearance, also becomes aroused...