Cosmos no Himitsu

One day, Mitsuko saves a boy when he is lost deep inside the forest. She takes him to her room and gives something to eat. He paints a picture of her in return. Mitsuko is soon attracted to his innocence.... He nestles up to her innocently and she finally shags with him.... Days later, Juri, her friend, visits her house. Juri is also spellbound to his innocence soon and secretly seduces him....