"If I let go, promise to take your clothes off."

"Billy, when your father gets home…"

"When my father gets home, I could tell him that you have a two-way mirror in Room 122!"

"Billy!"

"All I want you to do is take your clothes off for me again, Mom."

Sally was shaking with rage. But she knew she had no alternative. Tears came to her eyes as she nodded to her son.

He let go of her hand, then, crossing his arms over his chest, stood back, waiting for her to begin.

Sally sat there for several moments, gazing into Billy's eyes, trying to get him to take pity on her, but he stood firm. He was even bold enough to start rubbing his prick through his pants.

"Take your clothes off, Mom – or I tell Dad about yesterday!"

Tears of shame and anger sprang to Sally's eyes as she unbuttoned her dress and stepped out of it. All she had on underneath were a lacy bra and panties.

Billy's eyes bugged out, and he started rubbing his cock bulge harder. "Come on, Mom – take 'em off!"

"Please, Son…"

But Billy flashed her a look of such anger and need, she knew she'd have to go through with it. Gulping back the tears, she reached behind her and unhooked her bra. Then she brought it down her arms and off her tits.

She heard him gasp, then moan with desire. But she couldn't look at him. She just stared at the floor. Now she peeled her panties down and off her legs.

"Aw, yeah!" Billy moaned.

Sally heard the rasp of his zipper, and though she still couldn't look at him, she knew he'd taken off his clothes.

Now he walked up to her, and she raised her head to look at him. He was long-legged and thin and hadn't yet begun to fill out. And his cock was long and thin too, with a tuft of auburn hair at the base.