"Well," she said, hesitating. "Will you show me your… eh… thing?"

"What thing?" he asked, turning his attention back to the television.

"You know," she said. "Your thing, your prick."

"What?" he asked, stunned.

"Please, Bob?" she whispered.

"Have you lost your mind?" he gasped.

"Please, Bob," she begged, her pussy getting hotter by the second. "Just let me see it."

"My God!" he gasped. "I can't believe you!"

"Please?" she persisted, reaching for his zipper.

"Stop that!" he shouted, roughly pushing her hand away. "Why the hell do you want to see my prick?"

"Because I've never seen one!" she shouted back at him, reaching for his zipper again.

"You're not supposed to see one!" he snapped, pushing at her hand.

"Damn you!" she shouted, her eyes blazing with frustrated anger. "If you won't show me yours, I'll find some other guy to show me his cock!"

"You wouldn't dare!"

"Oh, yes I would," his sister hissed, for his zipper again. "And you know any other guy would be more than happy to let jug play with his prick."

Knowing what she said was true, he just stared at her with disbelief as she opened his fly. While he sat in stunned silence, she reached in, then gently withdrew his limp cock.

In spite of the circumstances, the soft touch of her fingers on his prick sent a warm, tingling glow through his loins.

The exciting feeling between her legs increased as Terri felt his cock begin to swell and throb in her hand. Staring in complete fascination, she watched his swelling purple cockhead start protruding from his foreskin. Gently squeezing it, she couldn't believe how big it was getting.

"My God, Sis, this is wrong," he weakly whispered as her hand began moving up and down the length of his now fully erect prick.

The young girl had never been so excited in her life. She was finding it difficult to breathe as her fingers explored every bump and vein on his big, blood-engorged prick. Slowly skimming the soft foreskin up and down over hiss throbbing fuck shaft, Terri rubbed his hot cockhead against her soft cheeks. She ran it up through her hair, under her chin and lightly across her moistly parted lips as his body trembled and lurched with ecstasy.