She worked her thighs together, rubbing her feet against each other. The pussyjuice leaked out of her like hot melted butter, making her a mess between the legs. She rubbed her tits, feeling their swollen weight, their silky softness and warmth. Her nipples stood up like fingers, surrounded by her erect and tingling cherry-bumps.

She pinched and tweaked her nipples, the fuck-tingles screwing through her cunt. She closed her eyes, picturing the scene in the tent. The first vision that popped into her mind was that of Billy, his cock randy and waving as he stumbled forward to mount the Mexican girl.

She'd had no idea Billy's cock had grown so large. It was certainly as large as Sam's, if not larger. Jutting up out of the young boy's slender loins, it appeared monstrously over-grown.

She shoved her hand between her legs, rubbing her frothing crotch, slipping her finger between the hairy slabs and sawing at the hot wet cuntmeat. As she slipped the finger inside herself, she moaned out loud.

She'd had no idea Billy knew how to fuck. Maybe he'd learned from watching the dog fuck the girl. Who knew, though, maybe Billy had been fucking girls for years without her knowing about it. She was not a prying mother and Billy's sex life was his own business. But it had come as a shock to see him up there fucking that Mexican girl, an exciting shock.

During the months since Sam had left, she'd more than a few times looked at Billy with hungry eyes. He was a young boy, but he exuded male sexuality. And he had the equipment of a man, she knew that now. He certainly had the equipment.

She was finger-fucking herself, thinking about her naked, erect little boy and masturbating furiously.