As she sat on her bed, she wondered if she could keep her son thinking they were pretending. If she could, there were all kinds of possibilities. They could have a lot of fun with each other, Susan thought. If Bobby would fuck her and pretend she was Mary, that would be fine with her. She might not be Mary, but she would be the one getting her son's lovely cock in her cunt – not the girl.

Susan wished she could come up with some excuse to call her son to her, bring him to her room and fuck him now.

She lifted her dress and shoved her hand into her panties, feeling about her cunt. She leaned back on the bed and spread her thighs, rubbing at her sensitive clit, her eyes closed as she fantasized about her son. She was breathing heavily, her face flushed with pleasure as she worked a finger into her cunt. The panties stretched around her hand as she finger-fucked herself this way, head back and eyes closed.

In the door stood Bobby, watching his mother.

His eyes were huge and his cock was again straining, only inside his pants now. He could see the full length of his mother's thighs, the soft, creamy inner surfaces as she held them wide apart. He gazed at her hand inside her panties, seeing it move, understanding what she was doing.

Susan brought herself to orgasm, and by the time she pulled her hand out of her panties, her son was gone, and she did not know he had watched her. But even if she had, it would have pleased her. She was wanting him to be with her, to touch her, feel her up and play with her body, finally shoving his cock up her cunt and fucking her.

And all because they had watched the naked Mary together while she jacked him off. All because of a naked girl.

Mary sunbathed almost every day, Susan knew. And she intended to watch from now on with her son, and she would jack his cock off every time they spied on Mary.