Wataru was planning to marry her soon. However, there was one thing that was bothering him. Her mother, Sayuri... He felt uneasy about Sayuri becoming his stepmother. It wasn't that he didn't like her. However, the thought that if he married her, Sayuri would be all alone made his heart ache unbearably. At that time, Wataru happened to see Sayuri masturbating. He couldn't get Sayuri's sad expression and her voluptuous skin out of his head, so he forgot about her and hugged her tightly...