At the request of his cousin, 'Touka' ends up taking care of her nephew Yoichi. Touka, a single mother, thinks it's perfect that her son has a playmate and readily agrees. However, Yoichi is drawn to Touka's beautiful body and tries to approach her while her son isn't looking. 'I wish... Touka's big breasts...' Yoichi, who had always envied Touka's perfect body, clings to her like a real son, making Touka's unsatisfied body respond. Their relationship quickly develops, and they end up having sex hidden from her actual son…
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