She felt herself salivating at the thought. She tugged on the little piece of skin on the underside of Jimmy's cock. He dug his fingers into her head. God, he was horny.

Still sucking his prick, she began masturbating. Her little clit was on fire. Fuck me, Daddy, eight to the bar, she thought with a giggle.

She kept sucking Jimmy's prick and masturbating, but after a while he pulled her on top of him. "Want to fuck?" she said with the innocence of a child.

"Yeah, but you can stay on top," her brother said.

"I can? You mean like this?" As she spoke she swung her leg over him, straddling his prick.

"Yeah, sit on it," he said.

Grabbing his cock, the teenager lowered her ass until her pussy touched the tip. "Now what?" she said.

"Stick it in."

Breathing rapidly, she came down hard on his cock, stuffing it into her almost-virgin twat. Both youngsters gasped as she began riding him.

Each thrust of his prick inside her brought her closer to orgasm. Leaning forward, she deliberately swung her tits over his chest.

Even though she was on top he did most of the work. He held her around the waist and thrust mightily into her eager snatch.

He was close to coming. His teeth were clenched and his eyes on his sister's bouncing tits. He felt the pressure in his balls and used every ounce of control to keep from coming.

He loved his sister and wanted her to come before he shot off. "Always make sure a woman comes before you come," his father's words were chiseled into his brain.

Penny was almost there. "You get on top now," she said, flopping over onto her back.

As quickly as his cock slipped out of her, he rammed it back in. Now he thrust forcefully and she felt his balls on her ass with every stroke.

"I'm almost there," she whispered.

Jimmy nodded encouragement. Jesus, please come, he thought.