"Are you gonna come?" she said.

"Maybe," he gasped.

"Are you gonna come on my hand?"

"Yeah, if you let me."

"I'd rather you fucked me."

"Huh?" Sweat poured down his temples.

"Honest, I'd really rather you fucked me than come on my hand."

He groaned but didn't speak. He was filled with mixed emotions. He wanted to fuck her. God, how he wanted to fuck her. He was dying to lose his cherry and tired of jerking off. But she was his kid sister. If his folks found out they'd skin him alive.

"Please," the teenage girl whispered.

"Let me think a minute," he said, his cock jutting out from his crotch.

"You know you want to," she said.

"I gotta think."

His balls ached. God, they must be turning blue. He had to give her an answer soon or he'd dump his load on her hand.

Then Penny did something that took the decision out of his hands. She dropped to her knees on the bath mat, opened her lips and took the head of his prick into her mouth.

"Jesus, Sis!" he hissed. He used every ounce of control he could muster to control his orgasm.

She only held his cockhead in her mouth a moment, but it was long enough to convince him he had to fuck her.

"Okay, Sis, but you better stop or I'll come in your mouth."

Giggling, the teenage girl defiantly licked her tongue over his cockshaft. "You better not," she said.

But she was wise enough to know his orgasm was close. She gently cupped his balls with one hand and licked his cockhead. She tasted his pre-orgasm jism and shivered. Is this what jism tastes like? If so, she wanted him to come in her mouth.

Suddenly he pushed her head back and grimaced. He pulled her to her feet and backed her against the wall. "Sit up there on the sink and I'll fuck you," he said.

She was very turned on, but the thought of fucking here in the bathroom didn't appeal to her. "How can we fuck if I'm sitting on the sink?"