Anna, a mother who loves bathing, knows that her son is always peeping on her while she is bathing. She invites her son to join her in the bath, but he gets excited by his mother's body and gets an erection. Anna has no choice but to give him a blowjob to make him cum. The next day, she finds out that Yuichi is peeking again and calls out to him, but it turns out to be Yuichi's friend. The friend finds out about the mother-son act and approaches Anna...