Joyce smiled at him, arching her shoulders to make her tits stand out even more. "That's a pretty cute prick sticking up there, honey," she said, pointing at his hard on. "I bet Shari would enjoy seeing it."

Bobby was quick to open his pants and take his cock out. He sat there, proudly, with his prick exposed, standing high in the air. The head of his cock was very smooth and very swollen, the shaft throbbing. There was a glistening bead of moisture on his piss hole.

Shari and Joyce stared at his cock, and Shari felt that new-found sensation bubbling between her thighs again. When her mother opened her robe once more, she did not try to pull it back. Instead, she sat on the couch, her tits fully revealed to her brother's hot eyes. When she felt her mother's hand on her knee, pulling her legs open wide, she didn't resist. She let her mother pull open her legs and was pleased at the way her brother's eyes burned while he gazed at her cunt.

"Pretty, isn't it, Bobby?" Joyce asked her son in a low, excited voice. "Isn't Shari's cunt pretty?"

"Gosh-a-damn-a-fuck!" Bobby grunted, grabbing his cock tightly. He openly and unhesitatingly began to jack off.

"You can do better than that now, baby," Joyce said. "You can fuck Shari instead of jacking off."

"I can?" Bobby's voice was cracked with excitement.

"Tell him, Shari," Joyce said, grinning wickedly at her daughter.

"Didn't we just say that, Bobby?" Shari murmured. "What have we been talking about the past hour?"

"I thought…"

"This is part of it, honey," Joyce interrupted, her voice low and husky. "Why stop halfway? Why not go all the way?"

"Oh, boy!" Bobby grunted, gripping his cock hard. He stared hotly between his sister's thighs, his eyes burning with lust. "You mean it, Mom?"

Deliberately Joyce ran her warm palm up her daughter's inner thigh, her finger stopping when they touched Shari's curling cunt hair. "Isn't that obvious, Bobby? Shari's cunt is beautiful! Wouldn't you love to fuck it for her?"