As Jenny crept into the guest room, something occurred to her. Why Daddy, when Benny had the parts Mommy had? Even at eight years old she knew how she was born. She backed out of it, into Benny's room, pushing him awake, whispering his name. "Benny. Benny!" Slowly, he stirred, and Jenny admired her older brother. He looked so pretty now, to her, anyway. His face looked more like Mommy's and his body was filling out like hers. "I have a favor to ask you..." He mumbled in response. "Can I sleep with you tonight?" Another mumble, with a "Sure" in it. Good enough for her.
Jenny climbed into his bed, which was more than big enough for both of them, cuddling into him and facing him so her erect thingy (she hadn't yet decided what to call it) was up between them. He seemed to wake up all at once, pulling away from her for a moment before falling back into drowsiness and hugging back. She slowly worked his somewhat tight boxers down his hips, lifting his shirt up and rolling on top of him. "Beeeenny..." He stirred once more, opening his eyes but still too tired to stifle a smile as she leaned up and kissed him on the cheek.
"You're pretty happy tonight, little sis... what do you want?" His eyes moved to her erect cock, and for a moment he hoped she didn't want what he thought she wanted.
"Can we do stuff like what Mommy and Daddy did? I know you did stuff with that girl Jessica from school, too."
He looked up at her, alarmed, fully awake now. "How did you know about that?"
She giggled. "You told me, silly. You tell me everything, remember? That you kissed her. I wish I had a boy to kiss me." Jenny pouted; it was the truth. All of the boys her age thought girls were icky. She knew Benny didn't.
Benny melted, sighing softly. He couldn't say no to his sister. It was his job to make her happy. He kissed her softly, not at all like he had Jessica, on the cheek. She clung to him in response, nuzzling him, and he felt her cock pulse between them.
"I want more, Benny," She said in a clouded voice, as if she weren't completely there. "Can I do what you did to Jessica?" Benny nearly gagged. She wanted to have sex with him. And somewhere inside, when he thought about it, he didn't really mind. Errant memories that weren't his floated lazily through his mind, and a small thrill raced through his body as he remembered some of Mom's times. He knew what an orgasm was.
