"Don't you get wet when you do it standing up, Ginger?" Toby was asking his sister.

Ginger giggled, a cute sound. "I did at first, but not anymore."

"Why did you wanna do it standing up?"

"I don't know. It just sounded like fun, and it is."

Toby turned to face his sister.

Susan jerked her hand to her mouth to stifle the sudden gasp.

Toby's jeans were open, his cock out.

Her eyes burned, turning glassy as she stared at it. There was a quick throb in her cunt, and only now did she realize the hand covering her mouth was the one she had been feeling of her cunt with. The heady scent assaulted her nostrils, and to her surprise, she almost came. She noticed that her daughter was gazing at her brother's cock with smoldering young eyes, her soft lips parted, and her chest heaving up and down.

It never entered Susan's mind to let them know she was there, to say something to them, to put a stop to it. All she wanted to do was watch, see what they would do with each other. She found herself becoming very excited, with her ass bunching as her cunt pulsated wetly. Her tits were still exposed, trembling as hunger boiled through her.

"Let's see how far you can do it," Ginger said in a trembling voice.

Toby took his cock in his fingers, arching his hips forward. "See that leaf? I can piss right on it."

Susan shivered. She didn't know her son used those words.

Ginger gave a little squeal, stepping to one side, her eyes fixed upon her brother's cock. "Do it, Toby. I wanna see if you can piss that far."

Susan's cunt was tightening, drawing inward. Listening to them was creating a wanton fire in her body, the sight of her son's cock making her shake from head to toe.