Bobby was stretched out on his bed. He was fully naked, with Carolyn sitting next to him. Bobby's cock stood up in hardness and Carolyn was clinging to it with a tight fist, gurgling with heat.

"It's been so long since I had your cock in my hand, Bobby!" Lynn heard her daughter say. "You didn't have any hair like you do now."

Bobby wiggled his hips, shoving his hand underneath the short skirt of his sister's nightgown.

"You didn't have these titties, either, Carolyn," he said as he cupped one.

Lynn watched her son's hand moving under her daughter's gown. Carolyn's beautiful thighs showed, along with the curls of her cunt. Lynn leaned against the doorjamb, unable to take her eyes from her children. Her son's cock was big and she could see the juices beading at his piss hole as Carolyn began to run her fist up and down his cock shaft.

"Remember how we tried to fuck when we didn't know how?" Carolyn laughed. "You pressed your cock against my cunt and we thought that was real fucking. Remember?"

"Yeah," Bobby said, his voice low, his hand cupping and squeezing his sister's tit.

Their words sent flashes of boiling sensations through Lynn's body. She stared at her son's hard cock, watching unashamedly as her daughter stroked it.

"I bet we know how now." Lynn heard her daughter say. "I bet we both know how to fuck now, Bobby."

"You wanna try?" Bobby whispered.

"Have you ever fucked?" Carolyn asked.

"Yes," he admitted.

"Who?" Carolyn pressed.

"I'm not gonna tell!" he said.

"Would you tell on me?" Carolyn asked. "I mean, if I let you fuck me, would you tell anyone?"

Bobby shook his head, arching his hips up and making his sister's fist tight at the base of his cock.

"If you don't!" he promised. "I won't tell."