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During a two-way interview at school, a teacher points out that "your son's knowledge of sex is lagging behind." Anko was pointed out by the teacher. If she doesn't do something about it, she'll be embarrassed when her son gets a girlfriend! So, she decided to make her son learn sex education from the next day. First, she watches porn with her son and teaches him how to get an erection, how to masturbate, and how a vagina works...