Martha was riddled with guilt as she quietly slipped out of the attic and returned to her room. Her heart pounded at the memory of Claire and Frank fucking.

Had she really seen it? It seemed difficult to believe that she'd actually witnessed her sister and brother-in-law screwing in their bedroom.

She felt cheated. She was aware more than ever now of all the years she'd shied away from men, all the years she'd avoided sex. She was jealous of Claire's intense pleasure in the act of fucking.

Martha had always thought it was wrong for a woman to let herself go like that. Now that she'd watched her sister writhing and grunting like an animal in response to the pumping of her husband's cock, she realized that all these years she'd been wrong!

She was missing out on life and she had to do something about it before the years slipped completely away, leaving her a dried-up old woman without any memories.

God, how uninhibited Claire was! The memory of Claire kneeling on the bed while Frank fucked her from behind made Martha's knees tremble.

She was ashamed of her shyness now. She'd been shy as a girl with boys and shy as a woman with men. How stupid it was!

Her cunt was soaked. Whenever her legs drew together, she could feel the wetness between her thighs.

She stood in front of a full-length mirror and watched her image as she peeled her clothes off. Stepping out of her jeans, she turned to inspect the swell of her ass cheeks inside her nylon panties. She put her hands on her ass and squeezed her firm flesh. She ran a fingertip into the deep crack between her full ass cheeks.