Bobby turned his back to his mother and sprawled onto his bed, his face cupped into the crook of his arms. Susan looked at her son's back, but her eyes seemed fixed on the way his ass cheeks bunched. She knew his pleasure was still glowing in his sweet balls.

Leaving him, she went to her room and sat on the bed, thinking hard about this.

If Bobby was embarrassed to have her, his mother, jack him off, he had not said anything so far. He shouldn't feel badly about it, she told herself. They were only pretending, and it was fun to pretend. Why not look at that exquisite nakedness of the slender Mary and pretend? Everyone had fantasies, erotic fantasies, and she and her son were no exception. It was all right if she helped her young son with them. They were doing nothing wrong, only pretending.

Long ago, when Susan had been a small girl, she had played house with boys, had played nurse and doctor with them. It had been fun and exciting then, and it was fun and exciting now, with her young son.

But Susan knew she wasn't pretending; she wanted to have her son's cock inside her cunt, fucking her. Maybe she had convinced Bobby it was pretending, but not herself.

Susan wasn't sure how much longer she could keep this up. It was quite frustrating to her. She wasn't sure if Mary knew she was being watched or not, yet Susan had an inkling Mary wouldn't care if she were seen. She knew her son was intensely excited over seeing the naked body of an older girl, and she was equally sure Bobby had never seen a naked girl of any age until now.

Bobby was not the kind of boy who ran about the neighborhood. He stayed home, with her, when he wasn't in school. He was a loner, not caring about baseball and various sports. He loved books, and was a studious young man, and was popular with his teachers because of it. He was quiet and well behaved.