Pushing open the double doors of the post office, Jennifer entered, followed by her son.

There was one other person checking mail, a woman a few years older than Jennifer. She was wearing tight jeans and a T-shirt, and she noticed her son give the woman's shapely ass a good look.

Jennifer moved to her postal box, which was low down in a long row of boxes. With her back to her son and the woman, she leaned over, her legs straight, twisting the combination lock. Her short skirt lifted upward, the creamy sweetness of her ass exposed.

She heard a gasp, and she glanced over her shoulder. The woman in jeans was staring at her ass. Jennifer went about her business of opening the lock, pretending to have trouble with it, her ass still showing.

When the woman turned to leave, Jennifer giggled.

Johnny was behind his mother, staring at her naked ass, his cock pushing hard at the front of his cut-offs.

"Fucking lock," Jennifer muttered loud enough for her son to hear. "Fucking thing won't open."

She heard her son suck in his breath. She had never said such words before, except that night when they enjoyed their mutual jack-off session together. Twisting at the lock, she swayed her exposed ass, spreading her feet further apart. Johnny saw now only his mother's satiny ass, but he also saw the blonde hairs of her cunt.

It was too much for him.

He pulled his cock from the frayed leg of his cut-offs, gripping it in his fist.

When Jennifer glanced over her shoulder at him, it was her turn to gasp.

"Johnny…" she murmured, staring hotly at his cock.

She leaned over a bit more, and almost all of her ass showed now. If anyone came into the post office, they would see quite a sight. They would see what her son was seeing – a very beautiful naked ass.