Marla wanted to ask what Sally and Bob had been doing with each other. The idea they might be fucking sent chills of bubbling delight through her. Even if they were just touching each other – Sally jacking her brother off, Bob fingerfucking his sister, it was enough to make Marla's pussy spasm with wet heat.

She gazed at her daughter's hands, and saw the slight movement. Sally was indeed rubbing at her cunt, feeling it through her dress and panties. She gazed openly, significantly, and Sally knew her mother was watching her hands. Marla smiled as she glanced back at her daughter.

Encouraged by her mother's expression, Sally pushed her fingers hard into her cunt, a soft moan coming from her. Bob, hearing his sister moan, glanced up. He saw where Sally's hands were, and looked back at his mother.

Marla's eyes flashed and she nodded her head.

"You can, too, baby," she whispered. "It's okay if you do it, too. I know what it's like. I told you, remember?"

Bob cock strained at his pants, outlined in hardness. Marla stared at it, licking her lips, swallowing. She was anxious for her son to touch his cock, to rub it while she watched. She wanted to see her son and daughter play with themselves, enjoy being with them the way she fantasized being with others, all of them as hot and eager as she. She didn't want her son or daughter to feel ashamed of their desires, nor be tormented because they couldn't get satisfaction, relief, from the terrible pressure. She wanted them to be happy and satisfied, even in their sexual desires – especially in their sexual desires.

Sally was openly rubbing at her cunt now, but she still had her skirt and panties between it and her hand. She was starting to breathe faster, her eyes taking on a glazed expression, her pouting lips parted. Her daughter was eagerly touching her cunt, but Bob didn't seem ready yet.

"Bob, I can see how hard you are," Marla said in a thick voice. "I can see you're very excited. Look at your sister; Sally isn't shy."