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Kyouko became Shingo's stepsister through her parents' remarriage. While her parents were traveling abroad, she lived alone with Shingo. Although she hides her libido from her brother, Kyouko is a total nympho who desperately wants to get pregnant. As she lives with him, she becomes aroused by Shingo and plans sexual encounters by giving him aphrodisiacs. She even gives aphrodisiacs to Shingo's friends to seduce both of them...
