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An older sister and a younger brother who are not close to each other and often quarrel with each other for trivial matters. However, in reality, this is all acting to deceive the eyes of parents. In fact, an incestuous relationship in which they love each other and pile up their bodies. If this happens to the parents, the two will surely be separated. That is why he plays a bad sister and younger brother in front of his parents. And when they are alone, in reaction to that, they confirm their love with each other's words and body, saying "I like it!" Because it is a forbidden relationship, it is strangely exciting SEX!